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• How do I create self-relationships in polymorphic inheritance in Elixir and Pylons?

  - by Turukawa

  I am new to programming and am following the example in the Pylons documentation on creating a Wiki. The database I want to link to the wiki was created with Elixir so I rewrote the Wiki database schema and have continued from there. In the wiki there is a requirement for a Navigation table which is inherited by Pages and Sections. A section can have many pages, while a page can only have one section. In addition, each sibling node can be chain-referenced to each other. So: Nav has "section" (OneToMany) and "before" (OneToOne - to reference preceeding node) Page has "section" (ManyToOne - many pages in one section) and inherits "before" Section inherits all from Nav The code I've written looks like this: class Nav(Entity): using_options(inheritance='multi') name = Field(Unicode(30), default=u'Untitled Node') path = Field(Unicode(255), default=u'') section = OneToMany('Page', inverse='section') after = OneToOne('Nav', inverse='before') before = OneToMany('Nav', inverse='after') class Page(Nav): using_options(inheritance='multi') content = Field(UnicodeText, nullable=False) posted = Field(DateTime, default=now()) title = Field(Unicode(255), default=u'Untitled Page') heading = Field(Unicode(255)) tags = ManyToMany('Tag') comments = OneToMany('Comment') section = ManyToOne('Nav', inverse='section') class Section(Nav): using_options(inheritance='multi') Errors received on this: sqlalchemy.exc.OperationalError: (OperationalError) table nav has no column named aftr_id u'INSERT INTO nav (name, path, aftr_id, row_type) VALUES (?, ?, ?, ?)' I've also tried: before = ManyToMany('Nav', inverse='before') on Nav in the hopes this might break the problem, but also not. The original SQLAlchemy code from the tutorial for these declarations is as follows: nav_table = schema.Table('nav', meta.metadata, schema.Column('id', types.Integer(), schema.Sequence('nav_id_seq', optional=True), primary_key=True), schema.Column('name', types.Unicode(255), default=u'Untitled Node'), schema.Column('path', types.Unicode(255), default=u''), schema.Column('section', types.Integer(), schema.ForeignKey('nav.id')), schema.Column('before', types.Integer(), default=None), schema.Column('type', types.String(30), nullable=False) ) page_table = schema.Table('page', meta.metadata, schema.Column('id', types.Integer, schema.ForeignKey('nav.id'), primary_key=True), schema.Column('content', types.Text(), nullable=False), schema.Column('posted', types.DateTime(), default=now), schema.Column('title', types.Unicode(255), default=u'Untitled Page'), schema.Column('heading', types.Unicode(255)), ) section_table = sa.Table('section', meta.metadata, schema.Column('id', types.Integer, schema.ForeignKey('nav.id'), primary_key=True), ) orm.mapper(Nav, nav_table, polymorphic_on=nav_table.c.type, polymorphic_identity='nav') orm.mapper(Section, section_table, inherits=Nav, polymorphic_identity='section') orm.mapper(Page, page_table, inherits=Nav, polymorphic_identity='page', properties={ 'comments':orm.relation(Comment, backref='page', cascade='all'), 'tags':orm.relation(Tag, secondary=pagetag_table) }) Any help is much appreciated.

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• Many tables for many users?

  - by Seagull

  I am new to web programming, so excuse the ignorance... ;-) I have a web application that in many ways can be considered to be a multi-tenant environment. By this I mean that each user of the application gets their own 'custom' environment, with absolutely no interaction between those users. So far I have built the web application as a 'single user' environment. In other words, I haven't actually done anything to support multi-users, but only worked on the functionality I want from the app. Here is my problem... What's the best way to build a multi-user environment: All users point to the same 'core' backend. In other words, I build the logic to separate users via appropriate SQL queries (eg. select * from table where user='123' and attribute='456'). Each user points to a unique tablespace, which is built separately as they join the system. In this case I would simply generate ALL the relevant SQL tables per user, with some sort of suffix for the user. (eg. now a query would look like 'select * from table_ where attribute ='456'). In short, it's a difference between "select * from table where USER=" and "select * from table_USER".

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• Are multiline queries sql-injection safe?

  - by acmatos

  This might be a stupid question. Or maybe my hacking skills are limited (I don't practice them at all). I have a query that looks like this: <?php $query =<<<eot SELECT table_x.field1, table_x.field2, table_y.*, table_z.field4 FROM ( SELECT ... ) as table_y LEFT JOIN table_x ON table_x.field1 = table_y.field_x LEFT JOIN table_z ON table_z.field1 = table_y.field_z WHERE table_x.field3 = '$something' AND table_z.field4 = '1' AND table_z.field5 = '2' eot; ?> I have a lot of other tests on $something before it gets used, like $something = explode(' ',$something); (which later result in a string) none of them intend to prevent injection but they make it hard for the given injection to get as is to the actual query. However, there are ways. We all know how easy it is to replace a space for something else which is still valid.. So, it's not really a problem to make a potentially harmful piece of SQL reach that $something... But is there any way to comment the rest of the original query string if it is multi-line? I can comment AND table_z.field4 = '1' using ;-- but can't comment the following AND table_z.field5 = '2' Is it possible to open a multi-line comment /* without closing it or something looked like and therefore allow the injection to ignore the multi-line query?

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• python mysqldb - mysql server gone away - can't reconnect

  - by david.barkhuizen

  Hi Folks, When attempting to import a bunch of data into mysql tables using python and mysqldb, I run into the following error '2006 - mySQL Server has gone away', and then I am unable to reconnect again within the script. I am iniitially re-using a connection object across transactions ( delineated by conn.commit() ), then when I first encounter this exception, if I create a new connection by calling MySQLdb.connect(), this new connection also fails with the same exception. This error does not occur immediately, I can pump a fair amount of data into the db, but then faithfully occurs after I have inserted a couple thousand records, so roughly once the db has committed a certain transaction volume, it always falls over like this. If I rerun the script, WITHOUT restarting the db server. then it resumes where it left off, pumps in some data, then falls over again. Before recommendations to change time-out timings, does anyone know why I am not able to establish a new connection after the initial failure ? - Even if I try a couple of times waiting a couple of seconds between each. (btw, I'm running Windows 7, mysql server 5.1.48, mysqldb 1.2.3.gamma.1, python 2.6)

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• MySQL tmpdir on /dev/shm with SELinux

  - by smorfnip

  On RHEL5, I have a small MySQL database that has to write temp files. To speed up this process, I would like to move the temporary directory to /dev/shm by putting the following line into my.cnf: tmpdir=/dev/shm/mysqltmp I can create /dev/shm/mysqltmp just fine and do chown mysql:mysql /dev/shm/mysqltmp chcon --reference /tmp/ /dev/shm/mysqltmp I've tried to make SELinux happy by applying the same settings that are in effect for /tmp/ (and /var/tmp/), which is presumably where MySQL is writing its tmp files if tmpdir is undefined. The problem is that SELinux complains about MySQL having access to that directory. I get the following in /var/log/messages: SELinux is preventing mysqld (mysqld_t) "getattr" to /dev/shm (tmpfs_t). SELinux is a hard mistress. Details: Source Context root:system_r:mysqld_t Target Context system_u:object_r:tmpfs_t Target Objects /dev/shm [ dir ] Source mysqld Source Path /usr/libexec/mysqld Port <Unknown> Host db.example.com Source RPM Packages mysql-server-5.0.77-3.el5 Target RPM Packages Policy RPM selinux-policy-2.4.6-255.el5_4.1 Selinux Enabled True Policy Type targeted MLS Enabled True Enforcing Mode Enforcing Plugin Name catchall_file Host Name db.example.com Platform Linux db.example.com 2.6.18-164.2.1.el5 #1 SMP Mon Sep 21 04:37:42 EDT 2009 x86_64 x86_64 Alert Count 46 First Seen Wed Nov 4 14:23:48 2009 Last Seen Thu Nov 5 09:46:00 2009 Local ID e746d880-18f6-43c1-b522-a8c0508a1775 ls -lZ /dev/shm shows drwxrwxr-x mysql mysql system_u:object_r:tmp_t mysqltmp and permissions for /dev/shm itself are drwxrwxrwt root root system_u:object_r:tmpfs_t shm I've also tried chcon -R -t mysqld_t /dev/shm/mysqltmp and setting the group on /dev/shm to mysql with no better results. Shouldn't it be enough to tell SELinux, hey, this is a temp directory just like MySQL was using before? Short of turning off SELinux, how do I make this work? Do I need to edit SELinux policy files?

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• GRUB doesn't recognize partitions on one harddisk

  - by knizz

  I have a dualboot computer with Windows Vista (on hd0) and Ubuntu 9.10. The bootloader is GRUB and the windows bootloader lets me decide between Vista and Ubuntu-Installation (broken WuBi). But now (i don't know why that changed) I can't use start the windows-bootloader anymore. I tried "ls" on the grub-prompt and it gave me a list like: (hd0) (hd1) (hd1,0) (hd1,1) (hd1,2) ... (fd0) It recognizes all partitions of hd1 (the ubuntu-harddisk) but not of hd0(the win-disk). .. WHY? Here is the result of the "boot info script" for the technical details: Boot Info Script 0.55 dated February 15th, 2010 ============================= Boot Info Summary: ============================== => Grub 2 is installed in the MBR of /dev/sda and looks for (UUID=a7c510e3-2399-437b-ab92-fa609e48d63f)/boot/grub. => No boot loader is installed in the MBR of /dev/sdb sda1: _________________________________________________________________________ File system: ntfs Boot sector type: Windows Vista/7 Boot sector info: No errors found in the Boot Parameter Block. Operating System: Windows Vista Boot files/dirs: /bootmgr /Boot/BCD /Windows/System32/winload.exe /wubildr.mbr /wubildr sda2: _________________________________________________________________________ File system: ntfs Boot sector type: Windows Vista/7 Boot sector info: No errors found in the Boot Parameter Block. Operating System: Boot files/dirs: sdb1: _________________________________________________________________________ File system: Boot sector type: Unknown Boot sector info: Mounting failed: mount: unbekannter Dateisystemtyp „“ sdb2: _________________________________________________________________________ File system: ntfs Boot sector type: Windows Vista/7 Boot sector info: No errors found in the Boot Parameter Block. Operating System: Boot files/dirs: sdb3: _________________________________________________________________________ File system: Bios Boot Partition Boot sector type: - Boot sector info: sdb4: _________________________________________________________________________ File system: ext4 Boot sector type: - Boot sector info: Operating System: Ubuntu 9.10 Boot files/dirs: /boot/grub/grub.cfg /etc/fstab /boot/grub/core.img sdb5: _________________________________________________________________________ File system: swap Boot sector type: - Boot sector info: =========================== Drive/Partition Info: ============================= Drive: sda ___________________ _____________________________________________________ Platte /dev/sda: 640.1 GByte, 640135028736 Byte 255 Köpfe, 63 Sektoren/Spuren, 77825 Zylinder, zusammen 1250263728 Sektoren Einheiten = Sektoren von 1 × 512 = 512 Bytes Disk identifier: 0x52554d66 Partition Boot Start End Size Id System /dev/sda1 * 2,048 307,202,047 307,200,000 7 HPFS/NTFS /dev/sda2 307,202,048 1,250,258,943 943,056,896 7 HPFS/NTFS Drive: sdb ___________________ _____________________________________________________ Platte /dev/sdb: 640.1 GByte, 640135028736 Byte 255 Köpfe, 63 Sektoren/Spuren, 77825 Zylinder, zusammen 1250263728 Sektoren Einheiten = Sektoren von 1 × 512 = 512 Bytes Disk identifier: 0x00000000 Partition Boot Start End Size Id System /dev/sdb1 1 1,250,263,727 1,250,263,727 ee GPT GUID Partition Table detected. Partition Start End Size System /dev/sdb1 34 262,177 262,144 Microsoft Windows /dev/sdb2 262,178 1,131,253,933 1,130,991,756 Linux or Data /dev/sdb3 1,131,253,934 1,131,255,887 1,954 Bios Boot Partition /dev/sdb4 1,131,255,888 1,245,312,528 114,056,641 Linux or Data /dev/sdb5 1,245,312,529 1,250,263,694 4,951,166 Linux Swap blkid -c /dev/null: ____________________________________________________________ Device UUID TYPE LABEL /dev/sda1 AE1440441440122F ntfs /dev/sda2 3AE66E4DE66E0A09 ntfs data /dev/sdb2 5419D16119DAA4DE ntfs LaufwerkD /dev/sdb4 a7c510e3-2399-437b-ab92-fa609e48d63f ext4 /dev/sdb5 60a0143a-e01b-450a-bbd1-f22059e47b65 swap ============================ "mount | grep ^/dev output: =========================== Device Mount_Point Type Options /dev/sdb4 / ext4 (rw,errors=remount-ro) =========================== sdb4/boot/grub/grub.cfg: =========================== # # DO NOT EDIT THIS FILE # # It is automatically generated by /usr/sbin/grub-mkconfig using templates # from /etc/grub.d and settings from /etc/default/grub # ### BEGIN /etc/grub.d/00_header ### if [ -s /boot/grub/grubenv ]; then have_grubenv=true load_env fi set default="0" if [ ${prev_saved_entry} ]; then saved_entry=${prev_saved_entry} save_env saved_entry prev_saved_entry= save_env prev_saved_entry fi insmod ext2 set root=(hd1,4) search --no-floppy --fs-uuid --set a7c510e3-2399-437b-ab92-fa609e48d63f if loadfont /usr/share/grub/unicode.pf2 ; then set gfxmode=640x480 insmod gfxterm insmod vbe if terminal_output gfxterm ; then true ; else # For backward compatibility with versions of terminal.mod that don't # understand terminal_output terminal gfxterm fi fi if [ ${recordfail} = 1 ]; then set timeout=-1 else set timeout=10 fi ### END /etc/grub.d/00_header ### ### BEGIN /etc/grub.d/05_debian_theme ### set menu_color_normal=white/black set menu_color_highlight=black/white ### END /etc/grub.d/05_debian_theme ### ### BEGIN /etc/grub.d/10_linux ### menuentry "Ubuntu, Linux 2.6.31-20-generic" { recordfail=1 if [ -n ${have_grubenv} ]; then save_env recordfail; fi set quiet=1 insmod ext2 set root=(hd1,4) search --no-floppy --fs-uuid --set a7c510e3-2399-437b-ab92-fa609e48d63f linux /boot/vmlinuz-2.6.31-20-generic root=UUID=a7c510e3-2399-437b-ab92-fa609e48d63f ro quiet splash initrd /boot/initrd.img-2.6.31-20-generic } menuentry "Ubuntu, Linux 2.6.31-20-generic (recovery mode)" { recordfail=1 if [ -n ${have_grubenv} ]; then save_env recordfail; fi insmod ext2 set root=(hd1,4) search --no-floppy --fs-uuid --set a7c510e3-2399-437b-ab92-fa609e48d63f linux /boot/vmlinuz-2.6.31-20-generic root=UUID=a7c510e3-2399-437b-ab92-fa609e48d63f ro single initrd /boot/initrd.img-2.6.31-20-generic } menuentry "Ubuntu, Linux 2.6.31-14-generic" { recordfail=1 if [ -n ${have_grubenv} ]; then save_env recordfail; fi set quiet=1 insmod ext2 set root=(hd1,4) search --no-floppy --fs-uuid --set a7c510e3-2399-437b-ab92-fa609e48d63f linux /boot/vmlinuz-2.6.31-14-generic root=UUID=a7c510e3-2399-437b-ab92-fa609e48d63f ro quiet splash initrd /boot/initrd.img-2.6.31-14-generic } menuentry "Ubuntu, Linux 2.6.31-14-generic (recovery mode)" { recordfail=1 if [ -n ${have_grubenv} ]; then save_env recordfail; fi insmod ext2 set root=(hd1,4) search --no-floppy --fs-uuid --set a7c510e3-2399-437b-ab92-fa609e48d63f linux /boot/vmlinuz-2.6.31-14-generic root=UUID=a7c510e3-2399-437b-ab92-fa609e48d63f ro single initrd /boot/initrd.img-2.6.31-14-generic } ### END /etc/grub.d/10_linux ### ### BEGIN /etc/grub.d/20_memtest86+ ### menuentry "Memory test (memtest86+)" { linux16 /boot/memtest86+.bin } menuentry "Memory test (memtest86+, serial console 115200)" { linux16 /boot/memtest86+.bin console=ttyS0,115200n8 } ### END /etc/grub.d/20_memtest86+ ### ### BEGIN /etc/grub.d/30_os-prober ### menuentry "Windows Vista (loader) (on /dev/sda1)" { insmod ntfs set root=(hd0,1) search --no-floppy --fs-uuid --set ae1440441440122f chainloader +1 } ### END /etc/grub.d/30_os-prober ### ### BEGIN /etc/grub.d/40_custom ### # This file provides an easy way to add custom menu entries. Simply type the # menu entries you want to add after this comment. Be careful not to change # the 'exec tail' line above. ### END /etc/grub.d/40_custom ### =============================== sdb4/etc/fstab: =============================== # /etc/fstab: static file system information. # # Use 'blkid -o value -s UUID' to print the universally unique identifier # for a device; this may be used with UUID= as a more robust way to name # devices that works even if disks are added and removed. See fstab(5). # # <file system> <mount point> <type> <options> <dump> <pass> proc /proc proc defaults 0 0 # / was on /dev/sdb4 during installation UUID=a7c510e3-2399-437b-ab92-fa609e48d63f / ext4 errors=remount-ro 0 1 # swap was on /dev/sdb5 during installation UUID=60a0143a-e01b-450a-bbd1-f22059e47b65 none swap sw 0 0 /dev/scd0 /media/cdrom0 udf,iso9660 user,noauto,exec,utf8 0 0 /dev/fd0 /media/floppy0 auto rw,user,noauto,exec,utf8 0 0 =================== sdb4: Location of files loaded by Grub: =================== 583.8GB: boot/grub/core.img 583.8GB: boot/grub/grub.cfg 579.7GB: boot/initrd.img-2.6.31-14-generic 580.0GB: boot/initrd.img-2.6.31-20-generic 579.7GB: boot/vmlinuz-2.6.31-14-generic 579.8GB: boot/vmlinuz-2.6.31-20-generic 580.0GB: initrd.img 579.7GB: initrd.img.old 579.8GB: vmlinuz 579.7GB: vmlinuz.old =========================== Unknown MBRs/Boot Sectors/etc ======================= Unknown BootLoader on sdb1 00000000 54 34 dc 3b 8b ff 6c fa 3e 59 3d 24 25 af 5f 9b |T4.;..l.>Y=$%._.| 00000010 72 f8 36 3d 56 30 22 fd c6 08 5e 39 7f dc 29 48 |r.6=V0"...^9..)H| 00000020 48 e5 24 52 77 b0 fc 64 b6 ce 48 c3 07 ce b5 81 |H.$Rw..d..H.....| 00000030 06 68 60 4f 6e fb 83 92 df 3a 54 b9 df 21 2a cd |.h`On....:T..!*.| 00000040 1e 2f e2 49 fe cf 81 2d 52 17 1a 4e 66 b4 f3 f0 |./.I...-R..Nf...| 00000050 41 25 e3 96 26 28 fe 19 61 72 75 f8 40 a3 b7 ef |A%..&(..aru.@...| 00000060 5f 79 dc cb 28 44 44 7c 9b 9a 7b 6c 4b 4b 60 0f |_y..(DD|..{lKK`.| 00000070 a9 97 87 bc 85 9f db bb d2 1a 88 9f aa 49 18 d5 |.............I..| 00000080 92 2d db 7e fe f7 8d 7a 18 c0 33 c5 bd 7a 46 07 |.-.~...z..3..zF.| 00000090 c8 27 13 66 94 49 62 9f bc 99 56 55 25 fb 94 a9 |.'.f.Ib...VU%...| 000000a0 3f b2 a7 0a 87 d0 a4 4e 51 f1 09 02 c4 29 eb ff |?......NQ....)..| 000000b0 26 3b 51 3e 5a 0c db ee a6 57 a7 c3 ba a1 74 90 |&;Q>Z....W....t.| 000000c0 ee 70 08 18 cc b8 d0 22 ce 96 c7 cb 68 40 98 20 |.p....."....h@. | 000000d0 49 3d 07 ec df d1 8d cf 19 bc 42 90 70 24 01 b4 |I=........B.p$..| 000000e0 28 cf c6 50 d3 95 5a 1b 18 15 33 c7 b2 a8 95 92 |(..P..Z...3.....| 000000f0 bb 93 fe 18 2b 81 c1 6b 9c 30 f1 65 50 6a 80 3d |....+..k.0.ePj.=| 00000100 74 37 a8 59 a6 51 8a 63 b6 d8 16 9f a9 47 2a 7c |t7.Y.Q.c.....G*|| 00000110 04 a7 fe 69 47 02 bf e9 b7 1b 7a ea 60 5c 3c 53 |...iG.....z.`\<S| 00000120 5b 10 78 dc 4d d2 a8 22 30 45 37 fb 56 06 9f 06 |[.x.M.."0E7.V...| 00000130 aa df cf 87 3a 3e cf 72 f2 e5 a6 c6 aa e2 7c 1c |....:>.r......|.| 00000140 64 c2 fc 80 ce 02 fc 7f 0f c6 60 81 bf cd 3b 5a |d.........`...;Z| 00000150 37 a5 38 1b 0c 1b 39 2e d6 f6 3d a2 36 e5 87 c3 |7.8...9...=.6...| 00000160 17 b5 fd ee 33 c7 ce a3 d9 c2 57 dc ee 85 48 9d |....3.....W...H.| 00000170 33 60 02 cd c5 83 44 44 ea b6 07 25 0a 4b a6 6e |3`....DD...%.K.n| 00000180 fc 51 42 cd 84 0b 65 b6 19 a1 e5 b2 eb 14 0c fa |.QB...e.........| 00000190 24 77 f5 44 6e 5d 39 dd b6 8e cc f8 30 fe 21 46 |$w.Dn]9.....0.!F| 000001a0 9c ff 95 c6 c7 b5 0a df 54 ca d2 ac bc 64 d0 97 |........T....d..| 000001b0 94 54 d9 29 0f 91 60 20 c3 e4 53 c2 b0 e4 40 72 |.T.)..` ..S...@r| 000001c0 7e 25 bc 81 06 ad 05 46 14 a7 e6 71 6b 5c db 9c |~%.....F...qk\..| 000001d0 0a 5e 76 23 ae 06 01 36 98 21 65 2c 90 e7 4b 1a |.^v#...6.!e,..K.| 000001e0 2a 2d 80 a5 48 db 9e 14 e0 9f e9 aa 00 e3 77 32 |*-..H.........w2| 000001f0 0f fd 94 db 55 a6 64 46 be ae ca de da ee 89 68 |....U.dF.......h| 00000200 =======Devices which don't seem to have a corresponding hard drive============== sdc sdd sde

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• Why are symbolic links not working in MySQL?

  - by Eno

  I'm having an issue, I searched a lot but I'm not sure if it's related to a previous security patch. On the last version of MySQL on Debian Lenny ( 5.0.51a-24 ) I need to share one table between two db, those two db are in the same path ( /var/lib/mysql/db1 & db2 ). I created symbolic links for db2 pointing to the table in db1. When I query the same table from db2 I get this : 'ERROR 1030 (HY000): Got error 140 from storage engine' This is how it looks : test-lan:/var/lib/mysql/test3# ls -alh drwx------ 2 mysql mysql 4.0K 2010-08-30 13:28 . drwxr-xr-x 6 mysql mysql 4.0K 2010-08-30 13:29 .. lrwxrwxrwx 1 mysql mysql 28 2010-08-30 13:28 blbl.frm -> /var/lib/mysql/test/blbl.frm lrwxrwxrwx 1 mysql mysql 28 2010-08-30 13:28 blbl.MYD -> /var/lib/mysql/test/blbl.MYD lrwxrwxrwx 1 mysql mysql 28 2010-08-30 13:28 blbl.MYI -> /var/lib/mysql/test/blbl.MYI -rw-rw---- 1 mysql mysql 65 2010-08-30 13:24 db.opt I really need those symlinks, is there a way to make them working like before ? ( old MySQL-server is fine ) Thanks,

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• Can I change the user id of a user on one Linux server to match another server in /etc/passwd?

  - by user76177

  I have a Rails application that is on a virtual machine (RHEL 6) and it's database is on dedicated hardware (also RHEL 6). The app server has an NFS directory from the db server mounted and accessible. It needs to write images to that server that are uploaded via the app. Background processes on the db server need to read and write to the same directory, as they perform resizing operations on the uploaded files. Right now none of this is working, because the user ids are different between the two systems. I only need this to work for this one application, so it is way too much overhead to put an LDAP system in place. Can I simply change the user id of this one user in one of the systems, or will that cause mass chaos? UPDATE: The fix worked, at least on local devices. Unfortunately the device I have mounted to the main db server still thinks my user id is 502 instead of 506. Do I need to remount that device, or is there an NFS daemon I can stop and restart to refresh it?

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• SQL Server Analysis Services, DNS, AD, Kerberos, Connection Issues

  - by ScaleOvenStove

  Running into a very weird issue. Converting servers to Windows 2008/SQL 2008. Have a server, SERVER_A, brand new, setup with Win2k8,Sql2k8 - works. Have a Server SERVER_B, running Windows2003/SQL2005. I want to migrate from SERVER_B to SERVER_A. I have all db's, cubes, etc setup on SERVER_A and it is mimicking functionality. Since users are using Excel to connect to SSAS, they connection string has SERVER_B in it. What I want to do, is, change DNS on the network to point SERVER_B (by name) at the ip of SERVER_A. I have successfully done this with another server, SERVER_C, but I need to do it with SERVER_B. What I have found is that with SERVER_C, after changing DNS, had to remove SERVER_C from AD and then it worked. I could connect to SERVER_C (DB), SERVER_C (SSAS Default Instance) and SERVER_C (SSAS Named instance) and it all was actually connecting to SERVER_A I tried to do the same with with SERVER_B, and no luck. Changed DNS, removed from AD, and it wouldn't connect. Found out that there were some SPN's in AD set up, so removed those and tried again. I then could connect to SERVER_B (DB), SERVER_B (SSAS Named Instance), but not SERVER_B (SSAS Default Instance). I could connect to SERVER_B (SSAS Default Intance WITH the Port #), but I need to be able to connect without the port number. I am at a loss to as why I can't connect to the default instance without a port #. Not sure if it is SPN's in AD, or another AD issue, or something else. Pretty sure it isnt something on the server (because SERVER_C works!) Any insight or suggestions would be greatly helpful!!

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• Symbolic links not working in MySQL

  - by Eno

  I'm having an issue, I searched a lot but I'm not sure if it's related to a previous security patch. On the last version of MySQL on Debian Lenny ( 5.0.51a-24 ) I need to share one table between two db, those two db are in the same path ( /var/lib/mysql/db1 & db2 ). I created symbolic links for db2 pointing to the table in db1. When I query the same table from db2 I get this : 'ERROR 1030 (HY000): Got error 140 from storage engine' This is how it looks : test-lan:/var/lib/mysql/test3# ls -alh drwx------ 2 mysql mysql 4.0K 2010-08-30 13:28 . drwxr-xr-x 6 mysql mysql 4.0K 2010-08-30 13:29 .. lrwxrwxrwx 1 mysql mysql 28 2010-08-30 13:28 blbl.frm -> /var/lib/mysql/test/blbl.frm lrwxrwxrwx 1 mysql mysql 28 2010-08-30 13:28 blbl.MYD -> /var/lib/mysql/test/blbl.MYD lrwxrwxrwx 1 mysql mysql 28 2010-08-30 13:28 blbl.MYI -> /var/lib/mysql/test/blbl.MYI -rw-rw---- 1 mysql mysql 65 2010-08-30 13:24 db.opt I really need those symlinks, is there a way to make them working like before ? ( old MySQL-server is fine ) Thanks,

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• RabbitMQ message consumers stop consuming messages

  - by Bruno Thomas

  Hi server fault, Our team is in a spike sprint to choose between ActiveMQ or RabbitMQ. We made 2 little producer/consumer spikes sending an object message with an array of 16 strings, a timestamp, and 2 integers. The spikes are ok on our devs machines (messages are well consumed). Then came the benchs. We first noticed that somtimes, on our machines, when we were sending a lot of messages the consumer was sometimes hanging. It was there, but the messsages were accumulating in the queue. When we went on the bench plateform : cluster of 2 rabbitmq machines 4 cores/3.2Ghz, 4Gb RAM, load balanced by a VIP one to 6 consumers running on the rabbitmq machines, saving the messages in a mysql DB (same type of machine for the DB) 12 producers running on 12 AS machines (tomcat), attacked with jmeter running on another machine. The load is about 600 to 700 http request per second, on the servlets that produces the same load of RabbitMQ messages. We noticed that sometimes, consumers hang (well, they are not blocked, but they dont consume messages anymore). We can see that because each consumer save around 100 msg/sec in database, so when one is stopping consumming, the overall messages saved per seconds in DB fall down with the same ratio (if let say 3 consumers stop, we fall around 600 msg/sec to 300 msg/sec). During that time, the producers are ok, and still produce at the jmeter rate (around 600 msg/sec). The messages are in the queues and taken by the consumers still "alive". We load all the servlets with the producers first, then launch all the consumers one by one, checking if the connexions are ok, then run jmeter. We are sending messages to one direct exchange. All consumers are listening to one persistent queue bounded to the exchange. That point is major for our choice. Have you seen this with rabbitmq, do you have an idea of what is going on ? Thank you for your answers.

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• SQL Server 2008 R2 - Cannot create database snapshot

  - by Chris Diver

  Server: Windows Server 2008 R2 X64 Enterprise SQL: SQL Server 2008 R2 Enterprise X64 I have a default SQL Server instance, the SQL Server service account is running as a domain user. I am trying to create a database snapshot in the directory where the mdf files are stored. The T-SQL syntax is correct. The file system is NTFS. The error message I get is: Msg 1823, Level 16, State 2, Line 1 A database snapshot cannot be created because it failed to start. Msg 5119, Level 16, State 1, Line 1 Cannot make the file "e:\MSSQL10_50.MSSQLSERVER\MSSQL\DATA\TestDB.ss" a sparse file. Make sure the file system supports sparse files. The local SQLServerMSSQLUser$db$MSSQLSERVER group has Full Control permission on the folder where I am trying to create the snapshot. I can fix the problem in two ways, neither of which are suitable. Add the SQL Server service (domain) account to the local Administrators group and restart the SQL service. Grant the local SQLServerMSSQLUser$db$MSSQLSERVER group Full control on E:\ I have tried to change the owner of the DATA directory to SQLServerMSSQLUser$db$MSSQLSERVER to no avail. I have no issue creating a new database Why can I not create a snapshot by giving permission only on the DATA folder? Update 23/09/2010: I have tried mrdenny's suggestion with no luck (but learned something new in the process), I suspect the problem may be due to the fact that the domain is a windows 2000 domain running in mixed mode. I had to install hotfix KB976494 for Server 2008 R2, as the SQL Server 2008 R2 installer would not verify the service account correctly with the domain. I noticed that Server 2000 isn't a supported operating system for SQL 2008 R2 but cannot find anything that would suggest it shouldn't work in a 2000 domain. I dis-joined the test server from the domain and changed the service accounts to the local service account and I still have the same issue. I will try to re-install the server without joining the domain and without the hotfix and see if the issue persists.

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• rsnapshot - not correctly archiving mysql databases

  - by Tiffany Walker

  My rsnapshot configuration: snapshot_root /.snapshots/ backup /home/user localhost/ backup_script /usr/local/backup_mysql.sh localhost/mysql/ Using this file: NOW=$(date +"%m-%d-%Y") # mm-dd-yyyy format FILE="" # used in a loop ### Server Setup ### #* MySQL login user name *# MUSER="root" #* MySQL login PASSWORD name *# MPASS="YOUR-PASSWORD" #* MySQL login HOST name *# MHOST="127.0.0.1" #* MySQL binaries *# MYSQL="$(which mysql)" MYSQLDUMP="$(which mysqldump)" GZIP="$(which gzip)" # get all database listing DBS="$($MYSQL -u $MUSER -h $MHOST -p$MPASS -Bse 'show databases')" # start to dump database one by one for db in $DBS do FILE=$BAK/mysql-$db.$NOW-$(date +"%T").gz # gzip compression for each backup file $MYSQLDUMP --single-transaction -u $MUSER -h $MHOST -p$MPASS $db | $GZIP -9 > $FILE done It dumps the databases under / I then tried with the following: http://bash.cyberciti.biz/backup/rsnapshot-remote-mysql-backup-shell-script/ I got: rsnapshot hourly ---------------------------------------------------------------------------- rsnapshot encountered an error! The program was invoked with these options: /usr/bin/rsnapshot hourly ---------------------------------------------------------------------------- ERROR: backup_script /usr/local/backup_mysql.sh returned 1 WARNING: Rolling back "localhost/mysql/" ls -la /.snapshots/hourly.0/localhost/mysql total 8 drwxr-xr-x 2 root root 4096 Nov 23 17:43 ./ drwxr-xr-x 4 root root 4096 Nov 23 18:20 ../ What exactly am I doing wrong? EDIT: # /usr/local/backup_mysql.sh *** Dumping MySQL Database *** Database> information_schema..cphulkd..eximstats..horde..leechprotect..logaholicDB_ns1..modsec..mysql..performance_schema..roundcube..test.. *** Backup done [ files wrote to /.snapshots/tmp/mysql] *** root@ns1 [~]# ls -la /.snapshots/tmp/mysql total 8040 drwxr-xr-x 2 root root 4096 Nov 23 18:41 ./ drwxr-xr-x 3 root root 4096 Nov 23 18:41 ../ -rw-r--r-- 1 root root 1409 Nov 23 18:41 cphulkd.18_41_45pm.gz -rw-r--r-- 1 root root 113522 Nov 23 18:41 eximstats.18_41_45pm.gz -rw-r--r-- 1 root root 4583 Nov 23 18:41 horde.18_41_45pm.gz -rw-r--r-- 1 root root 71757 Nov 23 18:41 information_schema.18_41_45pm.gz -rw-r--r-- 1 root root 692 Nov 23 18:41 leechprotect.18_41_45pm.gz -rw-r--r-- 1 root root 2603 Nov 23 18:41 logaholicDB_ns1.18_41_45pm.gz -rw-r--r-- 1 root root 745 Nov 23 18:41 modsec.18_41_45pm.gz -rw-r--r-- 1 root root 138928 Nov 23 18:41 mysql.18_41_45pm.gz -rw-r--r-- 1 root root 1831 Nov 23 18:41 performance_schema.18_41_45pm.gz -rw-r--r-- 1 root root 3610 Nov 23 18:41 roundcube.18_41_45pm.gz -rw-r--r-- 1 root root 436 Nov 23 18:41 test.18_41_47pm.gz MySQL Backup seems fine.

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• Tools to manage sql 2008 database mirroring?

  - by lemkepf

  We are going to be moving about 20 databases that live on a single instance of sql 2000 to a sql 2008 r2 environment with database mirroring. What I'm looking for is a tool or scripts that will help me manage the conversion and management of those 20db's onto this new mirrored environment easily. There are many steps in setting each DB up and I want to automate as much as possible. Edit: Here are the steps I've been doing manually: Create the same username/passwords from the old sql 2000 server onto new sql 2008 server. Then sync those users/passwords onto the other sql 2008 server with the same SSID's so when we do the db backup and restore they match up. Take a backup of each sql 2000 db's. Copy them to server A. Restore the backup to server A. Backup from server a, copy to server b, restore there. Run the mirror "configure security" wizard. Start mirroring. I've love to be able to script this out or have a tool that does it for me. Thanks! Paul

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• python mysqldb - mysql server gone away - can't reconnect

  - by david.barkhuizen

  When attempting to import a bunch of data into mysql tables using python and mysqldb, I run into the following error '2006 - mySQL Server has gone away', and then I am unable to reconnect again within the script. I am iniitially re-using a connection object across transactions ( delineated by conn.commit() ), then when I first encounter this exception, if I create a new connection by calling MySQLdb.connect(), this new connection also fails with the same exception. This error does not occur immediately, I can pump a fair amount of data into the db, but then faithfully occurs after I have inserted a couple thousand records, so roughly once the db has committed a certain transaction volume, it always falls over like this. If I rerun the script, WITHOUT restarting the db server. then it resumes where it left off, pumps in some data, then falls over again. Before recommendations to change time-out timings, does anyone know why I am not able to establish a new connection after the initial failure ? - Even if I try a couple of times waiting a couple of seconds between each. (btw, I'm running Windows 7, mysql server 5.1.48, mysqldb 1.2.3.gamma.1, python 2.6)

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• DNS Zone file and virtual host question (repost because my question got moved and now I can't comment on the original for some reason)

  - by Jake

  Sorry this is a repost, the original question got moved to here form stack overflow and for some reason I can't comment or respond to answers on that one anymore. Hi all, I'm trying to set up a virtual host for redmine.SITENAME.com. I've edited the httpd.conf file and now I'm trying to edit my DNS settings. However, I'm not sure exactly what to do. Here's an snippet of what's already in the named.conf file (the file was made by someone else who is unreachable): zone "SITENAME.com" { type master; file "SITENAME.com"; allow-transfer { ip.address.here.00; common-allow-transfer; }; }; I figure if I want to get redmine.SITENAME.com working, I need to copy that entry and just replace SITENAME.com with redmine.SITENAME.com but will that work? I was under the impression I needed a .db file but I don't see any reference to one in the current named.conf file. I also don't see any .db files or files named SITENAME in named.conf's directory. Any ideas where these illusive pre-existing db files could be?

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• switchover in postgresql

  - by user1010280

  I am using Postgresql 9.0 with Streaming replication. So, during switchover I follow these steps:- Get the server timestamp on primary. Get the current log position on primary. Set Verify Log location Verify Transaction Received Location Shutdown DB on production. Synchronize the transaction logs from PR to DR. Trigger a failover on the DR Database by creating the trigger file specified in recovery.conf Verify DB Mode on DR Copy the control file from from DR to primary. copy the temporary stats file from DR to primary. copy the history file from DR to primary. Create recovery.conf file. Start Database in standby mode in primary. Verify DB mode on PR At step (6), I have to copy last wal generated on Primary to standby and sync both PR and standby. but this thing takes time to copy files because this remote. So that postgres will keep seraching for wal for long time and after that it stops the server. So I want to know is there any way so that I can ask postgres to stop seraching or locating WAL after shutdown??? because postgres tries to locate this wal every 5 seconds. Please reply as soon as possible..its urgent...

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• ldap-authentication without sambaSamAccount on linux smb/cifs server (e.g. samba)

  - by umlaeute

  i'm currently running samba-3.5.6 on a debian/wheezy host to act as the fileserver for our department's w32-clients. authentication is done via OpenLDAP, where each user-dn has an objectclass:sambaSamAccount that holds the smb-credentials and an objectclass:shadowAccount/posixAccount for "ordinary" authentication (e.g. pam, apache,...) now we would like to dump our department's user-db, and instead use authenticate against the user-db of our upstream-organisation. these user-accounts are managed in a novell-edirectory, which i can already use to authenticate using pam (e.g. for ssh-logins; on another host). our upstream organisation provides smb/cifs based access (via some novell service) to some directories, which i can access from my linux client via smbclient. what i currently don't manage to do is to use the upstream-ldap (the eDirectory) to authenticate our institution's samba: i configured my samba-server to auth against the upstream ldap server: passdb backend = ldapsam:ldaps://ldap.example.com but when i try to authenticate a user, i get: $ smbclient -U USER \\\\SMBSERVER\\test Enter USER's password: Domain=[WORKGROUP] OS=[Unix] Server=[Samba 3.6.6] tree connect failed: NT_STATUS_ACCESS_DENIED the logfiles show: [2012/10/02 09:53:47.692987, 0] passdb/secrets.c:350(fetch_ldap_pw) fetch_ldap_pw: neither ldap secret retrieved! [2012/10/02 09:53:47.693131, 0] lib/smbldap.c:1180(smbldap_connect_system) ldap_connect_system: Failed to retrieve password from secrets.tdb i see two problems i'm having: i don't have any administrator password for the upstream ldap (and most likely, they won't give me one). i only want to authenticate my users, write-access is not needed at all. can i go away with that? the upstream ldap does not have any samba-related attributes in the db. i was under the impression, that for samba to authenticate, those attributes are required, as smb/cifs uses some trivial hashing which is not compatible with the usual posixAccount hashes. is there a way for my department's samba server to authenticate against such an ldap server?

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• SQL Server 2012 Maintenance Plan can't modify

  - by Crazyd

  Click on any created Maintenance Plan: TITLE: Microsoft SQL Server Management Studio Value cannot be null. Parameter name: component (System.Design) BUTTONS:OK Create a new Plan I get this error: TITLE: Maintenance Plan Wizard Progress Saving maintenance plan failed. ADDITIONAL INFORMATION: The SaveToSQLServer method has encountered OLE DB error code 0x80004005 (Unspecified error). The SQL statement that was issued has failed. The SaveToSQLServer method has encountered OLE DB error code 0x80004005 (Unspecified error). The SQL statement that was issued has failed. BUTTONS:OK Edit an already created Backup Plan: Error 1 Error loading 'BackupDb' : The LoadFromSQLServer method has encountered OLE DB error code 0x80004005 (Unspecified error). The SQL statement that was issued has failed. . server=SERVER;package=Maintenance Plans\BackupLeadsDb; 1 1 Attemped Solutions: I've changed password for SA Account; I use Windows Authentication to log in; and I've registered C:\Program Files (x86)\Microsoft SQL Server\110\DTS\Binn\DTS.dll. Repair SQL Server 2012, Uninstall/ReInstall SQL Server 2012.

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• ActiveMQ Configuration with KahaDB

  - by xeraa

  We are using ActiveMQ 5.6.0 with KahaDB. It has produced quite some log files, which is to be expected with our infrastructure, looking like this: $ ll -h /opt/activemq/data/kahadb/ total 969M drwxr-xr-x 2 root root 4.0K Nov 3 12:47 ./ drwxr-xr-x 3 activemq activemq 4.0K Sep 24 12:12 ../ -rw-r--r-- 1 root root 39M Oct 16 07:57 db-202.log -rw-r--r-- 1 root root 38M Oct 16 07:57 db-203.log -rw-r--r-- 1 root root 33M Oct 17 08:12 db-238.log ... No more messages were processed, when we ran into the 1GB temp usage limit. Or that's what we are assuming, is that correct? The configuration looks like this: <systemUsage> <systemUsage> <memoryUsage> <memoryUsage limit="512mb"/> </memoryUsage> <storeUsage> <storeUsage limit="3 gb"/> </storeUsage> <tempUsage> <tempUsage limit="1 gb"/> </tempUsage> </systemUsage> </systemUsage> After cleaning up the log files and being way below the limits, still no messages were consumed by AMQ. Only when we manually purged a route, messages were starting to be delivered again. So we need to ensure, that the KahaDB log size always stays below the temp usage, right? And that delivery was not picked up after fixing that is a bug or are there any other steps to be taken?

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• Oracle: 1 Large Server vs. 2 Smaller Servers?

  - by nvahalik

  We are in the planning stages of setting up our production Oracle 10gR2 environment. Our budget gives us the ability to buy 2 processor licenses of Oracle DB Standard Edition. We have minimal experience with Oracle so I'll defer to anyone who has used it. We are trying to decide if we should set up a single dual quad-core box or 2 individual quad-core boxes in a RAC configuration. Our DB right now is about 60 GB, and at our peak, we'll have up to 150 concurrent users. Most of the big stuff is done via batch processing at night. My gut tells me that having 2 boxes in a RAC configuration can't be a bad thing because it provides a true hardware failover solution. DB stored in a shared LUN on a SAN via iSCSI. Plus if we ever need to add capacity, we already have boxes in place that can be upgraded with extra procs (I assume with zero downtime, since it's set up in a RAC config) if we add extra licenses, or RAM. Does RAC have any performance penalties? Will it add extra latency? Is there any true advantage for having dual processor boxes running these systems? If we build out the Oracle boxes with special hardware: hardware iSCSI cards, TOE NICs, will these boxes be solid? We are deploying on 64-bit Windows. So what would you do? One box or two?

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• jdbc:jtds:sqlserver driver problem

  - by senzacionale

  sonar.jdbc.url: jdbc:jtds:sqlserver://127.0.0.1/SQL2008:1433/Sonar sonar.jdbc.driverClassName: net.sourceforge.jtds.jdbc.Driver sonar.jdbc.validationQuery: select 1 sonar.jdbc.username: Sonar sonar.jdbc.password: Sonar sonar.jdbc.maxActive: 10 sonar.jdbc.maxIdle: 5 sonar.jdbc.minIdle: 2 sonar.jdbc.maxWait: 5000 sonar.jdbc.minEvictableIdleTimeMillis: 600000 sonar.jdbc.timeBetweenEvictionRunsMillis: 30000 Server name of MS SQL server is: 127.0.0.1/SQL2008, DB is Sonar, user and passwd are Sonar but i can not connect to my DB with jdbc. In SQL developer connect by TCP IP works.

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• Update primary key value using entity framework

  - by lemkepf

  I'm trying to update one value of a compound primary key from within the entity framework and I'm getting this error: "The property 'CustomerID' is part of the object's key information and cannot be modified. " Here is my code: Dim customer As Customer = (From c In db.Customer Where c.CustomerID = "xxx" AndAlso c.SiteKey = siteKey).FirstOrDefault customer.CustomerID = "fasdfasdf" db.SaveChanges() It seems too simple. Is it true you can't update a primary key within the entity framework? I can't find any documentation on the topic. Thanks!

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• How much customization can you do with djangoforms.ModelForm?

  - by Randell

  I've just started playing with The Django Form Validation Framework on Google App Engine (from google.appengine.ext.db import djangoforms) and I got stuck googling how to customize forms using it. I was wondering whether the following are possible using the package: Add help texts beside/below input/select fields and textareas (e.g. "This field is required", "Example: qwerty123") Add/modify attributes for the input/select fields and textareas (e.g. adding the following attributes: class, id, name, maxlength, minlength, etc.) Add custom validations like checking whether a particular field should be unique or checking a value against a regular expression Modify the error messages Add another column to the table generated by the form Also note that djangoforms.ModelForm is different from django.forms.Form.

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• How to convert XML to JSON in Python?

  - by Geuis

  I'm doing some work on App Engine and I need to convert an XML document being retrieved from a remote server into an equivalent JSON object. I'm using xml.dom.minidom to parse the XML data being returned by urlfetch. I'm also trying to use django.utils.simplejson to convert the parsed XML document into JSON. I'm completely at a loss as to how to hook the two together. Below is the code I more or less have been tinkering with. If anyone can put A & B together, I would be SO greatful. I'm freaking lost. from xml.dom import minidom from django.utils import simplejson as json #pseudo code that returns actual xml data as a string from remote server. result = urlfetch.fetch(url,'','get'); dom = minidom.parseString(result.content) json = simplejson.load(dom) self.response.out.write(json)

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