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  • Does multiple files in SQL Server when using RAID help reduce conflicts in growth and file-locking?

    - by Dr Giles M
    I've been reading around and get the impression that if you are using RAID then using multiple SQL Server files within a filegroup won't yeild any more improvements, and the benefits are purely administrative (if you started to run out of space or wanted to partition off data into managable chunks for backups/balancing the data around your big server room). However, being a reasonably savvy software person, it's not unthinkable to hypothesise that, even for smaller databases that SQL Server will perform growth and locking operations (for writes) on a LOGICAL file basis, so even if you are using RAID, it seems to make sense to have multiple files in a file group to balance I/O, or does the time taken to reconstruct the data from distributed filegroups outweigh the benefits of reduced locking? I'm also aware that the behaviour and benefits may be different for tables/indeces/log. Is there a good site that distinguishes the benefits of multiple files when RAID is already in place?

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  • MySQL privileges - DROP tables, not databases

    - by Michal M
    Hi, Can someone help me with privileges here. I need to create a user that can DROP tables within databases but cannot DROP the databases? From what I understand from MySQL docs you cannot simply do this: The DROP privilege enables you to drop (remove) existing databases, tables, and views. Beginning with MySQL 5.1.10, the DROP privilege is also required in order to use the statement ALTER TABLE ... DROP PARTITION on a partitioned table. Beginning with MySQL 5.1.16, the DROP privilege is required for TRUNCATE TABLE (before that, TRUNCATE TABLE requires the DELETE privilege). Any ideas?

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  • MySQL Server Is Slow

    - by user2853965746
    I have two MySQL servers and one was just recently setup. The one I just recently setup is a bit slower than my older one, which kind of bothers me because I don't want my clients to be upset with the speed difference when I launch the new one. The older server runs on Ubuntu (~13.04 I believe) and the new one is on Debian 6. Both servers are 2GB ram, but my newer server is has an SSD, so I thought it might be the same speed if not faster. Anyway, the speed difference isn't too much (both are still under a second, but still noticeable). Whenever I select 50 rows from the user table on my older server (SELECT * FROM users LIMIT 50), I get the results in 0.003 s. There is 100,000+ accounts in that table. Whenever running the same command on the same table with only six dev accounts, it takes 0.069 s. It may not seem like a lot, but it's noticeable when you're used to a fast response. I added skip-name-resolve to the config and it didn't seem to help. Basically I'm asking if anyone knows what can cause a MySQL server to be slow in Debian 6? Should I just drop it and switch to Ubuntu like the older server (I don't think the OS is the problem, but you never know)? The older server is under a lot of use too, it's used a lot for web api's on my website. A lot of connections and stuff, and it still remains fast.

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  • Access losing db connections

    - by Dwight T
    I have a weird problem going on at work. People have been using MS Access to connect to sql server db and lately people are getting sporadic problems with connecting to the servers. It's not always the same users and it's not always a problem, which makes it a real pain to try to solve. One example of a related problem. A person has a linked table to a table and she would filter the table or write a query on the table to return where itemsku = 'ABCD1234'. It would return one record but the ItemSku LMKN7486 and everytime it would return the wrong record but consistently the wrong record so itemsku abcd1234 always returned LMNK7486 One would think it might be a driver problem, but it also could be a user problem. Just posting the question to see if anyone else has had similar senerios. Thanks

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  • DB2 users and groups

    - by Arun Srini
    Just want to know everyone's experience and take on managing users/authentication on a multi-node db2 cluster with users groups. I have 17 apps in production (project based company, only 2 online apps), and some 30 users with 7 groups. prodsel - group that has select privilege on all tables produpdt - update group on selective tables (as required by the apps) proddel - delete prodins - insert permissions for the group Now what my company does is when an app uses certain user (called app1user), and needs select and insert privilege on a table, they 1. grant select and insert for prodsel, prodins respectively 2. add the user under those two groups... now this creates one to many relationship between user and privileges, and this app1user also gets select on other tables granted for the prodsel group. I know this is wrong. Before I explain, I need to know how this is done elsewhere. Please share your experiences, even if you use other Databases that uses OS level authentication.

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  • Any good PostgreSQL client for linux?

    - by senotrusov
    stackoverflow points me "belongs-on-serverfault" on this, so crossposting. I am frustrated of not having a good Linux GUI administration and development tool for PostgreSQL. pgAdmin III is buggy and unusable piece of... hmm, software, compared to Windows-only PostgreSQL Maestro and EMS PostgreSQL manager. phpPgaAmin does not looks promising. EMS PostgreSQL manager can work under Wine, but such setup have a number of issues. Requirements are: Table data editing and browsing for large tables (1M+), able to jump by FK or some master-slave editing, GUI filtering and so on. ER diagrams with in-place schema editing Schema editing and browsing with all useful GUI support Schema changes log to put into DB versioning (migrations script). Tabbed interface to be able to work with a number of tables and SQL queries at once. And so on. Any ideas?

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  • SQL Server Performance & Latching

    - by Colin
    I have a SQL server 2000 instance which runs several concurrent select statements on a group of 4 or 5 tables. Often the performance of the server during these queries becomes extremely diminished. The querys can take up to 10x as long as other runs of the same query, and it gets to the point where simple operations like getting the table list in object explorer or running sp_who can take several minutes. I've done my best to identify the cause of these issues, and the only performance metric which I've found to be off base is Average Latch Wait time. I've read that over 1 second wait time is bad, and mine ranges anywhere from 20 to 75 seconds under heavy use. So my question is, what could be the issue? Shouldn't SQL be able to handle multiple selects on a single table without losing so much performance? Can anyone suggest somewhere to go from here to investigate this problem? Thanks for the help.

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  • Will restoring a cPanel account delete irrelevant mysql databases?

    - by user54625
    Long story short: I have many accounts in WHM, many domains. However, most of the MySQL databases for all the sites were created under one user, "admin" (let's say it's admin.com). I recently moved the admin.com account to another web server , and now I need to move it back. I would like to restore this account from a backup made by that web server. However, it only has 3 databases attached to that domain, while the server I'm moving it to has those 3 databases (old DBs that need to be replaced), PLUS all the other databases which are used by other accounts on the server. My question: if I restore the admin.com account, will it delete all the other databases on the account, or will it only replace the 3 DBs it has? I can't take any chances here to delete all those other DBs... If it WOULD delete all those other accounts, how would I go about restoring this account without losing the other data? An easy to way to resolve this situation would be to move the mysql owners to the proper accounts, but alas it doesn't seem that there is a way to do that via WHM.

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  • Flushing disk cache for performance benchmarks?

    - by Ido Hadanny
    I'm doing some performance benchmark on some heavy SQL script running on postgres 8.4 on a ubuntu box (natty). I'm experiencing some pretty un-stable performance, even though I'm supposed to be the only one running on the machine (the same script on the exact same data might run in 20m and then 40m for no specific reason). So, remembering my distant DBA training, I decided I should flush the postgres cache, using sudo /etc/init.d/postgresql restart, but it's still shaky! My question: maybe I'm missing some caches in my disk/os? I'm using a netapp appliance as my storage. Am I on the right track? Do I even want to make sure I get repeatable performance before I start tuning?

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  • On-demand RHEL/Centos Linux admin and MySQL admin

    - by user1322092
    Could you share with me a few reputable businesses/websites where I can quickly onboard a RHEL/Centos Linux admin or even a MySQL admins (say if I need help with disaster recovery). I have a cloud server, and I would like to task an admin to perform specific maintenance or even periodic. With the abundance of solely-run cloud servers, I would imagine there's a demand for this type of service (certainly for me).

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  • Best way to duplicate databases nightly?

    - by Margaret
    Hey all We just got two new servers, that are running Windows Server 2008. The intent is to make the machines pretty much identical, copying the content of the master to the slave on a nightly basis, so that if anything fails, the second copy can stand in immediately. It doesn't need to be up-to-the-minute mirroring, though I suppose that wouldn't hurt if performance is not affected. The two machines will, amongst other things, each be running an instance of SQL Server 2008. The aim is to duplicate the databases on the master down to the slave on a nightly basis. Unless I'm misunderstanding, the slave databases in mirrored databases require the primary to be present to work correctly; I'm hoping for some solution where we have a second machine that can be up and running with minimal downtime if the first one falls over. Am I misunderstanding mirroring? Is that the best way to do things, or should I use some other mechanism? If so, what?

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  • Read data from separate CSV file in OpenOffice Calc

    - by Thomi
    Hi, I have a very large CSV file (many thousands of rows) that I want to work with. Due to the size of the file, I don't want to import it into openoffice. Rather, I want to create a spreadsheet that contains formulas & graphs that read from this (or any other) CSV file I point it it. Ideally the spreadsheet will ask me what CSV file I want to use, allowing me to change the data source dynamically. Any ideas?

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  • ssh connection operation timed out using rsync

    - by Mark Molina
    I use rsync to backup my remote server on my local device but when I combine it with a cron job my ssh times out. Just to be clear, the data is stored on a remote server and I want it stored on my local server. The backup request must be sent from my local server to the remote server. The command for backup up the data is working when I just type it in terminal like this: rsync -chavzP --stats USERNAME@IPADDRES: PATH_TO_BACKUP LOCAL_PATH_TO_BACKUP but when I combine it with a cron job like this: 10 11 * * * rsync -chavzP --stats USERNAME@IP_ADDRESS: PATH_TO_BACKUP LOCAL_PATH_TO_BACKUP the ssh connection times out. When the cronjob executes it send a mail to the root user with the output like this: From local.xx.xx.xx Tue Jul 2 11:20:17 2013 X-Original-To: username Delivered-To: [email protected] From: [email protected] (Cron Daemon) To: [email protected] Subject: Cron <username@server> rsync -chavzP --stats USERNAME@IPADDRES: PATH_TO_BACKUP LOCAL_PATH_TO_BACKUP X-Cron-Env: <SHELL=/bin/sh> X-Cron-Env: <PATH=/usr/bin:/bin> X-Cron-Env: <LOGNAME=username> X-Cron-Env: <USER=username> X-Cron-Env: <HOME=/Users/username> Date: Tue, 2 Jul 2013 11:20:17 +0200 (CEST) ssh: connect to host IP_ADDRESS port XX: Operation timed out rsync: connection unexpectedly closed (0 bytes received so far) [receiver] rsync error: unexplained error (code 255) at /SourceCache/rsync/rsync-42/rsync/io.c(452) [receiver=2.6.9] So the rsync command is working when just typed in terminal but not when used by a cronjob. Can anybody explain this?

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  • What's the best way to store sort order in SQL?

    - by Duracell
    The guys at the top want sort order to be customizable in our app. So I have a table that effectively defines the data type. What is the best way to store our sort order. If I just created a new column called 'Order' or something, every time I updated the order of one row I imagine I would have to update the order of every row to ensure posterity. Is there a better way to do it?

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  • Postgresql init.d script not working

    - by Bram Jetten
    I installed Postgresql 8.4 on my VPS with Ubuntu 10.04. Default setup, nothing unusual. After the installation the dbserver is automatically started and is running great. The installer also sets a init.d script in place. This script however, doesn't seem to affect Postgres. $ sudo /etc/init.d/postgresql stop The above line is not stopping the server. The command does not fail or show any message. The logs won't say anything as well. After killing all postgres processes with killall I cannot get Postgres working again using the init script. When rebooting my VPS it somehow starts up and works again.

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  • cannot connect to <server_name>\sqlexpress

    - by Jackson Sunuwar
    I have tried disabling firing wall and checked sqlbrowser is started but for some reason I cannnot connect to my datbase... called server_name\sqlexpress.. I have a virtual machine and a full scale MS SQL Server 2008 R2 running on it... and I have several other vm running sqlexpress. they run fine and I can connect to them using sqlexpress... but when i try to access from sqlserver... I get this error. A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified) (Microsoft SQL Server, Error: -1) Digging deep into the error, I found this Error Number: -1 Severity: 20 State: 0 and finally this... Program Location: at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) at System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, SqlConnection owningObject) at System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, Boolean ignoreSniOpenTimeout, Int64 timerExpire, SqlConnection owningObject) at System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(String host, String newPassword, Boolean redirectedUserInstance, SqlConnection owningObject, SqlConnectionString connectionOptions, Int64 timerStart) at System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection owningConnection, DbConnectionPoolGroup poolGroup) at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) at System.Data.SqlClient.SqlConnection.Open() at Microsoft.SqlServer.Management.SqlStudio.Explorer.ObjectExplorerService.ValidateConnection(UIConnectionInfo ci, IServerType server) at Microsoft.SqlServer.Management.UI.ConnectionDlg.Connector.ConnectionThreadUser() Firewall is turned off on the VM that's running mssqlserver... I turned of firewall on one of the vm that's running the sqlexpress but I still get the error... can someone please help... thank you

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  • About can't export the performance problems.

    - by kyrathy
    At first,let me describe my environment My VirtualCenter is install on window 2008 ,and theDataBase that VC used is SQL 2008 I really want to ask is ..... When I use vsphere clinet to connect VC.....I got a problem. the performance chart only can show "realtime "...... whatever I only want to view the chart , or I want to export the performance log . when i manually want to export performance, and I select the time to 1 hour ,1 day ,1 month, or from a to b. it showed "No performance data to report for selected objects" only select realtime can export data normally. Before I install Vsphere 4 , I install the SQL 2008 , used the schema in the install CD(I follow the step to create SQL DB for vSphere) Could anybody help me how to solve this problem? And if need any information ,just tell me to provide. Thanks a lot.

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  • I want to install and get to building a personal MySQL DB on 64 bit Ubuntu [closed]

    - by Ari Hall
    So how do I go from installing MySQL from the Software Center to inputing data into fields and bringing in a comma delimited file? I've only had brief experience with MSAccess and OOo Base a long time ago, so details are appreciated, I just want to get up and running. I have Ubuntu 10.10, 64 bit, if that affects much. If you can link me to a howto that does exactly what I'm looking for, that would work. Again, Thanks!

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  • migrate SharePoint to SBS Server

    - by Eric Lorson
    We have a SharePoint 2003 server and we need to migrate that data to SharePoint 2011 on a SBS server. We cannot use the migration tool because one of the servers is SBS and the other is not. We exported the SharePoint data from the old system, but the import to the SBS SharePoint is failing with very little info on why. I think that there is a schema conflict, but I am not that familiar with SBS and I am not finding the error in the Windows logs. Has anyone had to migrate data from non-SBS system to an SBS system? Or can anyone help me figure out where to look for more info on what is going on?

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  • How do I extract excel data from multiple worksheets and put into one sheet?

    - by user167210
    In a workbook I have 7 sheets(Totals and then Mon to Sat),I want to extract rows which have the word "CHEQ" in its cell (this is a dropdown list with two options-CHEQ/PAID)from all sheets. On my front sheet I used this formula: =IF(ROWS(A$13:A13)>$C$10,"",INDEX(Monday!A$3:A$62,SMALL(IF(Monday[Paid]=$A$10,ROW(Monday[Paid])-ROW(Monday!$I$3)+1),ROWS(A$13:A13)))) This formula works fine for one worksheet (eg. Monday) but is it possible to show the extracted rows from all 6 sheets on the front page? I only have Excel NOT Access. These are the 12 headers on row A12 Col Name Cod House Car Date Discount 2nd Paid Extra Letter Posted The exported data appears like this (this just an example): Col Name Cod House Car Date Discount 2nd Paid Extra Letter Posted 12 Robbs 1244 Ren 11/10 10% 5 CHEQ 0 0 No 15 Jones 7784 Ren 12/10 15% 1 CHEQ 0 0 No 18 Doese 1184 Ren 12/11 12% 1 CHEQ 0 0 No Any ideas on what to do to this formula? I am using Excel 2010.

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