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  • mysql query for change in values in a logging table

    - by kiasectomondo
    I have a table like this: Index , PersonID , ItemCount , UnixTimeStamp 1 , 1 , 1 , 1296000000 2 , 1 , 2 , 1296000100 3 , 2 , 4 , 1296003230 4 , 2 , 6 , 1296093949 5 , 1 , 0 , 1296093295 Time and index always go up. Its basically a logging table to log the itemcount each time it changes. I get the most recent ItemCount for each Person like this: SELECT * FROM table a INNER JOIN ( SELECT MAX(index) as i FROM table GROUP BY PersonID) b ON a.index = b.i; What I want to do is get get the most recent record for each PersonID that is at least 24 hours older than the most recent record for each Person ID. Then I want to take the difference in ItemCount between these two to get a change in itemcount for each person over the last 24 hours: personID ChangeInItemCountOverAtLeast24Hours 1 3 2 -11 3 6 Im sort of stuck with what to do next. How can I join another itemcount based on latest adjusted timestamp of individual rows?

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  • mysql select when matching multiple rows

    - by user1735943
    I have a project where I need to select only the users that answered to some questions in a certain way (based on a filter). The filter table (filter) looks like this question | answer Q1 | A Q2 | B The user table (answers) looks like this user | question | answer 1 | Q1 | A 1 | Q2 | D 2 | Q1 | A 2 | Q2 | B How can I select from the user table only the user(s) that match the filter? I tried "SELECT user FROM answers WHERE (question = Q1 AND answer = A) AND (question = Q2 AND answer = B)" and it doesn't work -- I get an empty result. Thank you.

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  • MySQL, PHP, How Many in GROUP

    - by 0Neji
    I'm trying to create a table which outputs a list of users and how many times they've logged in. A new row in the table is created every time that someone logs in so there is multiple rows for one user. Now, I'm trying using the following statement to pull the data out: SELECT * FROM logins GROUP BY user ORDER BY timestamp DESC Which is working fine but now there is a column in my HTML table which should show how many times the user has logged in. How do I go about counting the amount of rows in each group?

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  • Problem with PHP & MySQL

    - by Shahd
    I wrote this statements but it is not work :( ... can you tell me why? HTML: <form action="join.php" method="post"> <label name="RoomName">Room1</label> </form> PHP: $roomName = $_POST['RoomName']; $roomID = "SELECT RoomID FROM rooms WHERE RoomName = $roomName";

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  • MYSQL accentuated characters é display as %E9

    - by Jk_
    Hi guys, I'm pushing data from as3 to MSQL through a little php script! My problem is that all my accentuated characters are displayed as weird iso characters. Example : é is displayed %E9 Obvisously the collation of my field is set to utf8_general_ci Even when I try to INSERT the data from a simple php script without as3, I get the same mistake. <?php mysql_connect("***", "***", "***") or die("Error :" .mysql_error()); mysql_select_db("***"); $query ="INSERT INTO test (message) values ('éèàïû')"; mysql_query($query) or die("Error updating DB"); ?> Any idea on what am I doing wrong and how I could fix that? Thanks in advance. Jk_

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  • Unable to keep the connecting using a wireless bridge

    - by dan
    I am running Ubuntu 12.04 on a dell inspiron desktop (core 2 duo) and am using wicd to manage my network/wifi. I've found that the WiFi card in the machine has trouble staying connected to my router (I believe this is a function of distance between the two), so I've taken an old Belkin F5d7231 wireless router and installed dd-wrt on it to use as a wireless bridge hoping that it will have better reception. I think everything up through the wireless bridge is working OK since I have no problems accessing the internet through it with my MacBook. The problem arises when I try to hook the ubuntu machine up to the wireless bridge. It will connect for a few minutes, but it will quickly disconnect without clear triggering event; it may be more likely to disconnect if there is a heavy traffic load going over it (could be something as simple as "cat big_text_file" in an ssh session). I've tried switching from dhclient to dhcpcd without much improvement. Here is the output from the syslog when it connects: Jun 30 17:10:08 Chicabuntu dhcpcd[28278]: wlan1: dhcpcd not running Jun 30 17:10:08 Chicabuntu dhcpcd[28278]: wlan1: exiting Jun 30 17:10:08 Chicabuntu dhcpcd[28312]: eth0: dhcpcd not running Jun 30 17:10:08 Chicabuntu dhcpcd[28312]: eth0: exiting Jun 30 17:10:08 Chicabuntu avahi-daemon[1041]: Interface eth0.IPv6 no longer relevant for mDNS. Jun 30 17:10:08 Chicabuntu avahi-daemon[1041]: Leaving mDNS multicast group on interface eth0.IPv6 with address fe80::21c:c4ff:fe31:1a83. Jun 30 17:10:08 Chicabuntu avahi-daemon[1041]: Withdrawing address record for fe80::21c:c4ff:fe31:1a83 on eth0. Jun 30 17:10:08 Chicabuntu kernel: [15184.976127] tg3 0000:3f:00.0: irq 44 for MSI/MSI-X Jun 30 17:10:08 Chicabuntu kernel: [15185.010805] ADDRCONF(NETDEV_UP): eth0: link is not ready Jun 30 17:10:08 Chicabuntu dhcpcd[28347]: eth0: dhcpcd not running Jun 30 17:10:08 Chicabuntu dhcpcd[28347]: eth0: exiting Jun 30 17:10:08 Chicabuntu kernel: [15185.180156] tg3 0000:3f:00.0: irq 44 for MSI/MSI-X Jun 30 17:10:08 Chicabuntu kernel: [15185.212785] ADDRCONF(NETDEV_UP): eth0: link is not ready Jun 30 17:10:10 Chicabuntu kernel: [15187.027445] tg3 0000:3f:00.0: eth0: Link is up at 100 Mbps, full duplex Jun 30 17:10:10 Chicabuntu kernel: [15187.027452] tg3 0000:3f:00.0: eth0: Flow control is on for TX and on for RX Jun 30 17:10:10 Chicabuntu kernel: [15187.028300] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready Jun 30 17:10:10 Chicabuntu dhcpcd[28353]: eth0: dhcpcd 3.2.3 starting Jun 30 17:10:10 Chicabuntu dhcpcd[28353]: eth0: hardware address = 00:1c:c4:31:1a:83 Jun 30 17:10:10 Chicabuntu dhcpcd[28353]: eth0: DUID = 00:01:00:01:17:81:85:79:00:1c:c4:31:1a:83 Jun 30 17:10:10 Chicabuntu dhcpcd[28353]: eth0: broadcasting for a lease Jun 30 17:10:11 Chicabuntu avahi-daemon[1041]: Joining mDNS multicast group on interface eth0.IPv6 with address fe80::21c:c4ff:fe31:1a83. Jun 30 17:10:11 Chicabuntu avahi-daemon[1041]: New relevant interface eth0.IPv6 for mDNS. Jun 30 17:10:11 Chicabuntu avahi-daemon[1041]: Registering new address record for fe80::21c:c4ff:fe31:1a83 on eth0.*. Jun 30 17:10:20 Chicabuntu kernel: [15197.568016] eth0: no IPv6 routers present Jun 30 17:10:29 Chicabuntu dhcpcd[28353]: eth0: offered 192.168.1.111 from 192.168.1.254 Jun 30 17:10:29 Chicabuntu dhcpcd[28353]: eth0: checking 192.168.1.111 is available on attached networks Jun 30 17:10:30 Chicabuntu dhcpcd[28353]: eth0: leased 192.168.1.111 for 86400 seconds Jun 30 17:10:30 Chicabuntu dhcpcd[28353]: eth0: adding IP address 192.168.1.111/24 Jun 30 17:10:30 Chicabuntu avahi-daemon[1041]: Joining mDNS multicast group on interface eth0.IPv4 with address 192.168.1.111. Jun 30 17:10:30 Chicabuntu dhcpcd[28353]: eth0: adding default route via 192.168.1.254 metric 0 Jun 30 17:10:30 Chicabuntu dhcpcd[28353]: eth0: exiting Jun 30 17:10:30 Chicabuntu avahi-daemon[1041]: New relevant interface eth0.IPv4 for mDNS. Jun 30 17:10:30 Chicabuntu avahi-daemon[1041]: Registering new address record for 192.168.1.111 on eth0.IPv4. Jun 30 17:10:30 Chicabuntu dhcpcd.sh: interface eth0 has been configured with new IP=192.168.1.111 Jun 30 17:10:39 Chicabuntu ntpdate[28439]: adjust time server 91.189.94.4 offset 0.001915 sec And here is the syslog from when it shuts down the connection without reason: Jun 30 17:12:15 Chicabuntu kernel: [15312.575455] tg3 0000:3f:00.0: eth0: Link is down Jun 30 17:12:16 Chicabuntu dhcpcd[28603]: eth0: sending signal 1 to pid 28361 Jun 30 17:12:16 Chicabuntu dhcpcd[28361]: eth0: received SIGHUP, releasing lease Jun 30 17:12:16 Chicabuntu dhcpcd[28603]: eth0: exiting Jun 30 17:12:16 Chicabuntu avahi-daemon[1041]: Withdrawing address record for 192.168.1.111 on eth0. Jun 30 17:12:16 Chicabuntu avahi-daemon[1041]: Leaving mDNS multicast group on interface eth0.IPv4 with address 192.168.1.111. Jun 30 17:12:16 Chicabuntu avahi-daemon[1041]: Interface eth0.IPv4 no longer relevant for mDNS. Jun 30 17:12:16 Chicabuntu dhcpcd[28361]: eth0: removing default route via 192.168.1.254 metric 0 Jun 30 17:12:16 Chicabuntu avahi-daemon[1041]: Interface eth0.IPv6 no longer relevant for mDNS. Jun 30 17:12:16 Chicabuntu avahi-daemon[1041]: Leaving mDNS multicast group on interface eth0.IPv6 with address fe80::21c:c4ff:fe31:1a83. Jun 30 17:12:16 Chicabuntu avahi-daemon[1041]: Withdrawing address record for fe80::21c:c4ff:fe31:1a83 on eth0. Jun 30 17:12:16 Chicabuntu dhcpcd[28361]: eth0: netlink: No such process Jun 30 17:12:16 Chicabuntu dhcpcd[28361]: eth0: removing IP address 192.168.1.111/24 Jun 30 17:12:16 Chicabuntu dhcpcd[28361]: eth0: netlink: Cannot assign requested address Jun 30 17:12:16 Chicabuntu dhcpcd[28361]: eth0: exiting Jun 30 17:12:16 Chicabuntu dhcpcd.sh: interface eth0 has been brought down Jun 30 17:12:17 Chicabuntu kernel: [15313.612141] tg3 0000:3f:00.0: irq 44 for MSI/MSI-X Jun 30 17:12:17 Chicabuntu kernel: [15313.644703] ADDRCONF(NETDEV_UP): eth0: link is not ready Jun 30 17:12:17 Chicabuntu dhcpcd[28674]: wlan1: dhcpcd not running Jun 30 17:12:17 Chicabuntu dhcpcd[28674]: wlan1: exiting Jun 30 17:12:17 Chicabuntu dhcpcd[28708]: eth0: dhcpcd not running Jun 30 17:12:17 Chicabuntu dhcpcd[28708]: eth0: exiting Jun 30 17:12:17 Chicabuntu kernel: [15313.912147] tg3 0000:3f:00.0: irq 44 for MSI/MSI-X Jun 30 17:12:17 Chicabuntu kernel: [15313.944746] ADDRCONF(NETDEV_UP): eth0: link is not ready Jun 30 17:12:18 Chicabuntu kernel: [15315.592569] tg3 0000:3f:00.0: eth0: Link is up at 100 Mbps, full duplex Jun 30 17:12:18 Chicabuntu kernel: [15315.592576] tg3 0000:3f:00.0: eth0: Flow control is on for TX and on for RX Jun 30 17:12:18 Chicabuntu kernel: [15315.593399] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready Jun 30 17:12:20 Chicabuntu avahi-daemon[1041]: Joining mDNS multicast group on interface eth0.IPv6 with address fe80::21c:c4ff:fe31:1a83. Jun 30 17:12:20 Chicabuntu avahi-daemon[1041]: New relevant interface eth0.IPv6 for mDNS. Jun 30 17:12:20 Chicabuntu avahi-daemon[1041]: Registering new address record for fe80::21c:c4ff:fe31:1a83 on eth0.*. Jun 30 17:12:29 Chicabuntu kernel: [15325.680019] eth0: no IPv6 routers present If this isn't useful, I can also post the wicd log, but that is kind of long. If anyone could help me I would be eternally grateful.

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  • How to tell statd to use portmap on a non-localhost ipadress?

    - by jneves
    How can I make statd connect to other IP address other than 127.0.0.1? I have a server that is connected to 2 different networks (one is public, another a private). I want it to provide a NFS share for only the private network. The host in an ubuntu 8.04. The private ip address is 192.168.1.202 I changed /etc/default/portmap to add: OPTIONS="-i 192.168.1.202" The command lsof -n | grep portmap returns: portmap 10252 daemon cwd DIR 202,0 4096 2 / portmap 10252 daemon rtd DIR 202,0 4096 2 / portmap 10252 daemon txt REG 202,0 15248 13461 /sbin/portmap portmap 10252 daemon mem REG 202,0 83708 32823 /lib/tls/i686/cmov/libnsl-2.7.so portmap 10252 daemon mem REG 202,0 1364388 32817 /lib/tls/i686/cmov/libc-2.7.so portmap 10252 daemon mem REG 202,0 31304 16588 /lib/libwrap.so.0.7.6 portmap 10252 daemon mem REG 202,0 109152 16955 /lib/ld-2.7.so portmap 10252 daemon 0u CHR 1,3 960 /dev/null portmap 10252 daemon 1u CHR 1,3 960 /dev/null portmap 10252 daemon 2u CHR 1,3 960 /dev/null portmap 10252 daemon 3u unix 0xecc8c3c0 4332992 socket portmap 10252 daemon 4u IPv4 4332993 UDP 192.168.1.202:sunrpc portmap 10252 daemon 5u IPv4 4332994 TCP 192.168.1.202:sunrpc (LISTEN) portmap 10252 daemon 6u REG 0,12 289 3821511 /var/run/portmap_mapping I defined in /etc/hosts the following: 192.168.1.202 server.local In /etc/default/nfs-common I changed STATDOPTS to: STATDOPTS="--name server.local" Yet when I run /etc/init.d/nfs-common start if fails to start. The log shows: Jun 8 06:37:44 cookwork-web1 rpc.statd[9723]: Version 1.1.2 Starting Jun 8 06:37:44 cookwork-web1 rpc.statd[9723]: Flags: Jun 8 06:37:44 cookwork-web1 rpc.statd[9723]: unable to register (statd, 1, udp). An strace -f rpc.statd -n server.local results in a lot of lines, including this one: sendto(9, "\200]3\362\0\0\0\0\0\0\0\2\0\1\206\240\0\0\0\2\0\0\0\1"..., 56, 0, {sa_family=AF_INET, sin_port=htons(111), sin_addr=inet_addr("127.0.0.1")}, 16) = 56

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  • Transitioning from Oracle based CMS to MySQL based CMS

    - by KM01
    We're looking at a replacement for our CMS which runs on Oracle. The new CMSes that we've looked at can in theory run on Oracle, but most of the vendor's installs run off of MySQL vendor supports install of their CMS on MySQL, and a "theoretical" install on Oracle the vendor's dev shops use MySQL none of them develop/test against Oracle Our DBA team works exclusively with Oracle, and doesn't have the bandwidth to provide additional support for a highly available and performing MySQL setup. They could in theory go to training and get ramped up, but our time line is also short (surprise!). So ... I guess my question(s) are: If you've seen a situation like this, how have you dealt with it? What tipped the balance either way? What type of effort did it take? If you're to do it over, what would you do differently ... ? Thanks! KM

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  • On MySQL 5.1 for Windows, why can't I assign DBA role to the "root" user?

    - by djangofan
    On MySQL 5.1 for Windows, why can't I assign DBA role to "root" user? The MySQL Workbench allows me to add all the other roles except for DBA. Also, when I "alter schema" on any table, while logged in as root, I dont see all the tabs that show me all the database properties... I only see the first tab that allows me to change collation only. What is wrong with this picture? How do i give root all priveleges? I've tried a few variations of GRANT ALL PRIVILEGES etc. from the command line but nothing works. My root account is unable to alter column names, indexes, or options of any given table that I create. I can create tables and delete them but I can't alter them.

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  • best practice? Consumer data in MySQL on Amazon EBS (Elastic block store)

    - by jeff7091
    This is a consumer app, so I will care about storage costs - I don't want to have 5x copies of data lying about. The app shards very well, so I can use MySQL and not have scaling issues. Amazon EBS has a nice baseline+snapshot backup capability that uses S3. This should have a light footprint (in terms of storage cost). BUT: the magnolia.com story scares the crap out of me: basically flawless block-level backup of a corrupt DB or filesystem. Is there anything that is nearly as storage efficient as EBS at the MySQL level?

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  • To Do list for multiple users using MySQL, Need some advice regarding Projectwork?

    - by Steve
    i am thinking to create a To Do list sort of thing for my Project work. it's sort of a To do list type thing, meant for Multiple Users. i mean each user will have his Login and Password , to access into his account or profile and from there he/she can Manage his own To-Do list. it's has to be Kind of like Remember the Milk sort of. Every user will have his own To Do list. i mean now as Different users will have Different To Dos to perform and so different To Dos Lists, if for data fields like in tabular form. Task || Priority || Deadline || Number of days required ||Status. -----||----------||----------||-------------------------||-------------------- -----||----------||----------||-------------------------||-------------------- -----||----------||----------||-------------------------||-------------------- So what i meant to ask , Can this type of thing be done using MySQL as database and and any web based server side language PHP, ASP, JSP. i mean Can this be done through RDBMS like MySQL, for here different member users will have different to do lists than each others to keep and maintain.

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  • Apache and MySQL taking all the memory? Maximum connections?

    - by lpfavreau
    I've a had one of our servers going down (network wise) but keeping its uptime (so looks the server is not losing its power) recently. I've asked my hosting company to investigate and I've been told, after investigation, that Apache and MySQL were at all time using 80% of the memory and peaking at 95% and that I might be needing to add some more RAM to the server. One of their justifications to adding more RAM was that I was using the default max connections setting (125 for MySQL and 150 for Apache) and that for handling those 150 simultaneous connections, I would need at least 3Gb of memory instead of the 1Gb I have at the moment. Now, I understand that tweaking the max connections might be better than me leaving the default setting although I didn't feel it was a concern at the moment, having had servers with the same configuration handle more traffic than the current 1 or 2 visitors before the lunch, telling myself I'd tweak it depending on the visits pattern later. I've also always known Apache was more memory hungry under default settings than its competitor such as nginx and lighttpd. Nonetheless, looking at the stats of my machine, I'm trying to see how my hosting company got those numbers. I'm getting: # free -m total used free shared buffers cached Mem: 1000 944 56 0 148 725 -/+ buffers/cache: 71 929 Swap: 1953 0 1953 Which I guess means that yes, the server is reserving around 95% of its memory at the moment but I also thought it meant that only 71 out of the 1000 total were really used by the applications at the moment looking a the buffers/cache row. Also I don't see any swapping: # vmstat 60 procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 0 0 0 57612 151704 742596 0 0 1 1 3 11 0 0 100 0 0 0 0 57604 151704 742596 0 0 0 1 1 24 0 0 100 0 0 0 0 57604 151704 742596 0 0 0 2 1 18 0 0 100 0 0 0 0 57604 151704 742596 0 0 0 0 1 13 0 0 100 0 And finally, while requesting a page: top - 08:33:19 up 3 days, 13:11, 2 users, load average: 0.06, 0.02, 0.00 Tasks: 81 total, 1 running, 80 sleeping, 0 stopped, 0 zombie Cpu(s): 1.3%us, 0.3%sy, 0.0%ni, 98.3%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 1024616k total, 976744k used, 47872k free, 151716k buffers Swap: 2000052k total, 0k used, 2000052k free, 742596k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 24914 www-data 20 0 26296 8640 3724 S 2 0.8 0:00.06 apache2 23785 mysql 20 0 125m 18m 5268 S 1 1.9 0:04.54 mysqld 24491 www-data 20 0 25828 7488 3180 S 1 0.7 0:00.02 apache2 1 root 20 0 2844 1688 544 S 0 0.2 0:01.30 init ... So, I'd like to know, experts of serverfault: Do I really need more RAM at the moment? How do they calculate that for 150 simultaneous connections I'd need 3Gb? Thanks for your help!

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  • How to use Binary Log file for Auditing and Replicating in MySQL?

    - by Pranav
    How to use Binary Log file for Auditing in MySQL? I want to track the change in a DB using Binary Log so that I can replicate these changes to other DB please do not give me hyperlinks for MySQL website. please direct me to find the solution EDIT I have looked for auditing options and created a script using Triggers for that, but due toi the Joomla DB structure it did'nt worked for me, hence I have to move on to Binary Log file concept now i am stucked in initiating the concept as I am not getting the concept of making the server master/slave, so can any body guide me how to actually initiate it via PHP?

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  • DRBD and MySQL - Heartbeat Setup

    Heartbeat automates all the moving parts and can work as well with the MySQL master-master active/passive solution as well as it can with the MySQL & DRBD solution. It manages the virtual IP address used by the database, directs DRBD to become primary, or relinquish primary duties, mounts the /dev/drbd0 device, and starts/stops MySQL as needed.

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  • DRBD and MySQL - Heartbeat Setup

    Heartbeat automates all the moving parts and can work as well with the MySQL master-master active/passive solution as well as it can with the MySQL & DRBD solution. It manages the virtual IP address used by the database, directs DRBD to become primary, or relinquish primary duties, mounts the /dev/drbd0 device, and starts/stops MySQL as needed.

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  • How to establish the real-time communication between Shopping cart running MySQL and Internal System Running PostgreSQL [closed]

    - by Andrew
    I am thinking about the way of establishing some-sort of real-time connection between MySQLpowered shopping cart and internal system that is running on PostgreSQL. Could you give me some sort of insight on this topic? For example, I can write some sort of csv export application, then enable remote MySQL for over the internet connection and then import csv to mysql directly from PC. Or upload csv and run cron on server. But this way of import-export causing delays; so I would like to link databased (or some msort). I have never done it before and would like to hear some opinions about this. Another way "just a thought" might to implement triggers that would initiate the update process via csv; but again, I would like to avoid csv. Do you have any good advise? Maybe some specific examples?

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  • MySQL Enterprise Backup 3.8.2 - Overview

    - by Priya Jayakumar
      MySQL Enterprise Backup (MEB) is the ideal solution for backing up MySQL databases. MEB 3.8.2 is released in June 2013. MySQL Enterprise Backup 3.8.2 release’s main goal is to improve usability. With this release, users can know the progress of backup completed both in terms of size and as a percentage of the total. This release also offers options to be able to manage the behavior of MEB in case the space on the secondary storage is completely exhausted during backup. The progress indicator is a (short) string that indicates how far the execution of a time-consuming MEB command has progressed. It consists of one or more "meters" that measures the progress of the command. There are two options introduced to control the progress reporting function of mysqlbackup command (1) –show-progress (2) –progress-interval. The user can control the progress indicator by using “--show-progress” option in any of the MEB operations. This option instructs MEB to output periodically short reports on the progress of time-consuming commands. The argument of this option instructs where the output could be sent. For example it could be stderr, stdout, file, fifo and table. With the “--show-progress” option both the total size of the backup to be copied and the size that’s already copied will be shown. Along with this, the state of the operation for example data or meta-data being copied or tables being locked and other such operations will also be reported. This gives more clear information to the DBA on the progress of the backup that’s happening. Interval between progress report in seconds is controlled by “--progress-interval” option. For more information on this please refer progress-report-options. MEB can also be accessed through GUI from MySQL WorkBench’s next version. This can be used as the front end interface for MEB users to perform backup operations at the click of a button. This feature was highly requested by DBAs and will be very useful. Refer http://insidemysql.com/mysql-workbench-6-0-a-sneak-preview/ for WorkBench upcoming release info. Along with the progress report feature some of the important issues like below are also addressed in MEB 3.8.2. In MEB 3.8.2 a new command line option “--on-disk-full” is introduced to abort or warn the user when a backup process encounters a full disk condition. When no option is given, by default it would abort. A few issues related to “incremental-backup” are also addressed in this release. Please refer 3.8.2 documentation for more details. It would be good for MEB users to move to 3.8.2 to take incremental backups. Overall the added usability and the important defects fixed in this release makes MySQL Enterprise Backup 3.8.2 a promising release.  

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  • How to optimize mysql databse for serving 1000s of requests at a time ?

    - by Bilal
    How to optimize mysql databse for serving 1000s of requests at a time ? for a site like: linksnappy.com Is it possible to configure 2 seperate mysql servers into one load balancing server? like if one of them is overloaded switch to the next one ? same question for the http requests handling server. Another question : what kind of server do I need to server 1000s of requests at a time ? (http server) you can see the kind of site Im talking about is a download site. the server just dies when we have too many download requests. we currently have intel xeon quad core 2.4ghz with 4gb of ram.

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  • How can artificially create a slow query in mysql?

    - by Gray Race
    I'm giving a hands on presentation in a couple weeks. Part of this demo is for basic mysql trouble shooting including use of the slow query log. I've generated a database and installed our app but its a clean database and therefore difficult to generate enough problems. I've tried the following to get queries in the slow query log: Set slow query time to 1 second. Deleted multiple indexes. Stressed the system: stress --cpu 100 --io 100 --vm 2 --vm-bytes 128M --timeout 1m Scripted some basic webpage calls using wget. None of this has generated slow queries. Is there another way of artificially stressing the database to generate problems? I don't have enough skills to write a complex Jmeter or other load generator. I'm hoping perhaps for something built into mysql or another linux trick beyond stress.

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  • MySQL on Windows - how do I set the wait_timeout for connections using named pipes?

    - by gustafc
    I use a MySQL database running on a Windows box, and for performance reasons I'm connecting to it using named pipes. The (Java) application using the database (through Hibernate) can let the connection lie idle for quite a long time, which causes the connection to fail with the following message: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 33 558 297 milliseconds ago. The last packet sent successfully to the server was 33 558 297 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem. autoReconnect unfortunately has no effect (and neither does autoReconnectForPools), but the wait_timeout docs state that wait_timeout only applies "to TCP/IP and Unix socket file connections, not to connections made via named pipes, or shared memory". How can I change the wait_timeout for named pipes?

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  • How to set up linux watchdog daemon with Intel 6300esb

    - by ACiD GRiM
    I've been searching for this on Google for sometime now and I have yet to find proper documentation on how to connect the kernel driver for my 6300esb watchdog timer to /dev/watchdog and ensure that watchdog daemon is keeping it alive. I am using RHEL compatible Scientific Linux 6.3 in a KVM virtual machine by the way Below is everything I've tried so far: dmesg|grep 6300 i6300ESB timer: Intel 6300ESB WatchDog Timer Driver v0.04 i6300ESB timer: initialized (0xffffc900008b8000). heartbeat=30 sec (nowayout=0) | ll /dev/watchdog crw-rw----. 1 root root 10, 130 Sep 22 22:25 /dev/watchdog | /etc/watchdog.conf #ping = 172.31.14.1 #ping = 172.26.1.255 #interface = eth0 file = /var/log/messages #change = 1407 # Uncomment to enable test. Setting one of these values to '0' disables it. # These values will hopefully never reboot your machine during normal use # (if your machine is really hung, the loadavg will go much higher than 25) max-load-1 = 24 max-load-5 = 18 max-load-15 = 12 # Note that this is the number of pages! # To get the real size, check how large the pagesize is on your machine. #min-memory = 1 #repair-binary = /usr/sbin/repair #test-binary = #test-timeout = watchdog-device = /dev/watchdog # Defaults compiled into the binary #temperature-device = #max-temperature = 120 # Defaults compiled into the binary #admin = root interval = 10 #logtick = 1 # This greatly decreases the chance that watchdog won't be scheduled before # your machine is really loaded realtime = yes priority = 1 # Check if syslogd is still running by enabling the following line #pidfile = /var/run/syslogd.pid Now maybe I'm not testing it correctly, but I would expecting that stopping the watchdog service would cause the /dev/watchdog to time out after 30 seconds and I should see the host reboot, however this does not happen. Also, here is my config for the KVM vm <!-- WARNING: THIS IS AN AUTO-GENERATED FILE. CHANGES TO IT ARE LIKELY TO BE OVERWRITTEN AND LOST. Changes to this xml configuration should be made using: virsh edit sl6template or other application using the libvirt API. --> <domain type='kvm'> <name>sl6template</name> <uuid>960d0ac2-2e6a-5efa-87a3-6bb779e15b6a</uuid> <memory unit='KiB'>262144</memory> <currentMemory unit='KiB'>262144</currentMemory> <vcpu placement='static'>1</vcpu> <os> <type arch='x86_64' machine='rhel6.3.0'>hvm</type> <boot dev='hd'/> </os> <features> <acpi/> <apic/> <pae/> </features> <cpu mode='custom' match='exact'> <model fallback='allow'>Westmere</model> <vendor>Intel</vendor> <feature policy='require' name='tm2'/> <feature policy='require' name='est'/> <feature policy='require' name='vmx'/> <feature policy='require' name='ds'/> <feature policy='require' name='smx'/> <feature policy='require' name='ss'/> <feature policy='require' name='vme'/> <feature policy='require' name='dtes64'/> <feature policy='require' name='rdtscp'/> <feature policy='require' name='ht'/> <feature policy='require' name='dca'/> <feature policy='require' name='pbe'/> <feature policy='require' name='tm'/> <feature policy='require' name='pdcm'/> <feature policy='require' name='pdpe1gb'/> <feature policy='require' name='ds_cpl'/> <feature policy='require' name='pclmuldq'/> <feature policy='require' name='xtpr'/> <feature policy='require' name='acpi'/> <feature policy='require' name='monitor'/> <feature policy='require' name='aes'/> </cpu> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <devices> <emulator>/usr/libexec/qemu-kvm</emulator> <disk type='file' device='disk'> <driver name='qemu' type='raw'/> <source file='/mnt/data/vms/sl6template.img'/> <target dev='vda' bus='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </disk> <controller type='usb' index='0'> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/> </controller> <interface type='bridge'> <mac address='52:54:00:44:57:f6'/> <source bridge='br0.2'/> <model type='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> <interface type='bridge'> <mac address='52:54:00:88:0f:42'/> <source bridge='br1'/> <model type='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/> </interface> <serial type='pty'> <target port='0'/> </serial> <console type='pty'> <target type='serial' port='0'/> </console> <watchdog model='i6300esb' action='reset'> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/> </watchdog> <memballoon model='virtio'> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> </memballoon> </devices> </domain> Any help is appreciated as the most I've found are patches to kvm and general softdog documentation or IPMI watchdog answers.

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