The choice of settings for hardware, firmware, software or other components of a database system.

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30
votes
6answers
16k views

What is a good, repeatable way to calculate MAXDOP on SQL Server?

When setting up a new SQL Server 2012, I use the following code to determine a good starting point for the MAXDOP setting: /* This will recommend a MAXDOP setting appropriate for your machine's ...
26
votes
3answers
7k views

Is it possible to have passwords configured per database or per host in .my.cnf

I have the following in my ~/.my.cnf [client] password="somepass" but this is not the password I use for every user@host/database I connect to. Is there some way to specify in the config different ...
17
votes
5answers
6k views

Why are periodic restarts required to keep my instance performing well?

We've got a production DB server on SQL 2005. Everything runs normally for a while, but after a couple weeks we see a notable performance drop. Only restarting SQL Server brings performance back to ...
14
votes
4answers
5k views

Make SqlClient default to ARITHABORT ON

First things first: I'm using MS SQL Server 2008 with a database at compatibility level 80, and connecting to it with .Net's System.Data.SqlClient.SqlConnection. For performance reasons I've created ...
12
votes
6answers
4k views

Reasons for disabling statistics auto update?

I just learned that a client company I work for has decided to keep the auto update statistics options off for some of their SQL Servers, and the DBAs manually troubleshooting performance issues when ...
12
votes
3answers
9k views

How should I configure the RAID array of SSD drives on my SQL Server?

I'm building a SQL Server with 48 GB RAM, 1 CPU, & 8 SATA III (6GB/s) SSD drives (128 GB Crucial m4) and an LSI MegaRAID controller (SAS 9265-8i). I expect the typical work load to be mostly ...
10
votes
2answers
3k views

Risks of changing to ARITHABORT ON

I'm working with a vendor with the arrangement that they provide the core application, and I can build my own extensions as long as I don't modify the core application. It's built in ColdFusion ...
10
votes
2answers
16k views

Cannot configure nor start MySQL

On a brand new Kubuntu 14.04 install, I ran sudo aptitude install mysql-server-core-5.6. The install could not complete due to dependencies of some KDE packages on mysql-server-core-5.5, which would ...
9
votes
2answers
497 views

SQL Server max memory, page file, max degree parallelism

Three questions hope you DBA masters of the universe can answer: I know it is best practice to set SQL Server's max memory. So if a server with 44 GB RAM has SQL Server installed we should set the ...
8
votes
2answers
1k views

What fillfactor for caching table?

I have heavily updated / accessed table where I store serialized java objects. They are in the table for 2-3 hours (also are being updated during that period) and then removed. Size of table is around ...
8
votes
2answers
4k views

More CPU cores vs faster disks

I'm part of a small company so as usual covering a number of different roles. The latest of which is procuring a dedicated SQL Server box for our .NET web app. We've been quoted on a dual Xeon E5-2620 ...
8
votes
1answer
178 views

Lower performance on newest servers

We have several db servers on production, 4 of them with very similar hardware configuration. Dell PowerEdge R620, only difference is that 2 newest ones (bought and configured 3 months ago) have RAID ...
7
votes
3answers
11k views

save/export PGAdmin server list configuration settings

I have a ton of configured connections listed in the Server Groups, is there a way I can save this? not just save the passwords but the Server Group Settings
7
votes
2answers
11k views

Dynamic change to innodb_flush_log_at_trx_commit

This is related to this question. It does help to get better performance for InnoDB tables. According to MySQL manual, innodb_flush_log_at_trx_commit is a global dynamic variable. Thus, I can change ...
7
votes
1answer
187 views

On-the-fly query/command modification

I'm responsible for administrating an instance of SQL Server 200x which has the misfortune of serving as a backend to a turnkey application written with a disgusting performance problem. It repeatedly ...
7
votes
1answer
158 views

Is it ever ok to not test a feature? [closed]

Is there any point at which you become so familiar with your language/database/system that there is no need to test a new feature/configuration/query/etc. by contained/simulated testing before ...
6
votes
2answers
3k views

MySQL replication: most important config parameters for performance on slave server?

I'm setting up a mysql master-slave configuration, where slave is located on a much weaker sever. Since, if I understand correctly, slave only works on updates/inserts, what are the most critical ...
6
votes
2answers
20k views

sqlnet.ora or tnsnames.ora changes require reboot?

Anytime you change Oracle's sqlnet.ora or tnsnames.ora files, does the system require a reboot? In my instance, I only have the Oracle client installed on the machine I'm referring to, but out of ...
6
votes
3answers
85 views

SQL Server Agent won't start

When I'm trying to start SQL Server Agent, I got this error: TITLE: Microsoft SQL Server Management Studio Unable to start service SQLAGENT$SQL_NAGA on server NAGA. (mscorlib) ADDITIONAL ...
6
votes
2answers
2k views

Transaction speed benchmarks for mySQL v5.6 replication - seems very slow

I'm trying to select the best configuration for our new infrastructure but got a bit confused about the results. I used sysbench v0.5 for the tests: prepare data sysbench ...
6
votes
1answer
779 views

PostgreSQL: Recommendation size for shared_buffers

I am rather new to PostgreSQL. I started migrating some MySQL databases to PostgreSQL one month ago. I am looking for help about the proper memory values for the configuration file. Currently, I ...
5
votes
1answer
418 views

Restarting database server or just the database

I am an application programmer. We have a SQL Server 2012 instance that hosts many related databases (around 12 databases). The vendors did some changes to one of the database and the application and ...
5
votes
3answers
192 views

Virtualize SQL High CPU

This is a client environment which needs significant overhaul so all I am trying to do is slow the bleeding. Situation CPU is getting crushed, often 80% or higher utilization VMWARE 5.5, Windows ...
5
votes
1answer
933 views

Optimum configuration for 4 SSD drives

I would like to move a SQL Server database from a shared configuration with the web-server to it's own dedicated box. My current budget will allow me to put 4 disks together in an array with a single ...
5
votes
2answers
1k views

How to change SQL sever configuration manager settings using TSQL?

SQL server configuration manager is used to configure certain settings like connection protocols, service start up, etc... Is it possible to make these changes that is done in SQL server ...
5
votes
1answer
45 views

How to run SQL services on NT SERVICE\MSSQLSERVER account if it is running earlier on LocalSystem

Recently just for experimental puprose, I have relocated the default (C:...) data\log file paths in server settings to new location (G:\DBA). Then I've moved the previously existing db's data\log ...
5
votes
3answers
184 views

Slow query performance due to temporary file?

Here is the query: SELECT "products".* FROM "products" WHERE (status > 100) AND "products"."above_revenue_average" = 't' AND ("products"."category_id" NOT IN (5)) ORDER BY ...
5
votes
1answer
2k views

Connecting from SSMS to an EC2 SQL Instance

I have an EC2 server running SQL2008 R2. I opened the port 1433 and successfully tested with yougetsignal.com/tools/open-ports. I have set the SQL Server to Accept Remote Connections. I have set ...
5
votes
1answer
146 views

Performance problem after migration from SQL Server 2005 to 2012 [closed]

Last Friday, I migrated a SQL Server instance from 2005 Enterprise Edition to a brand new Windows Server 2012 server with SQL Server 2012 Enterprise Edition installed. Since then, users have started ...
5
votes
1answer
4k views

SQL Server Report Manager 404 using HTTPS

OK. I have scoured the Internet for information on trying to fix this and found nothing that deals with my situation. I started here, that lead me to here, that lead me to looking at netsh commands ...
5
votes
1answer
190 views

Is there a configuration setting for how many pages ANALYZE will scan?

Is there a setting that controls how many records/pages are scanned by the PostgreSQL ANALYZE command? It looks like by default it scans 30,000 pages and 30,000 records. The PostgreSQL Server ...
5
votes
1answer
6k views

What should I set max_connections to for MySQL?

I have MySQL 5.1.35 on Linux Centos. The Linux server has 2GB RAM with 14GB of disk space. I have created some web services using the Restlet framework in Java that has 1,000+ users. What should I ...
5
votes
1answer
60 views

To minimize Cache misses in PostgreSQL?

You can calculate cache misses as described here. However, I am interested in how to minimize the phenomenon in PostgreSQL 9.4.3 on x86_64-unknown-linux-gnu, compiled by gcc (Debian 4.9.2-10) 4.9.2, ...
5
votes
1answer
3k views

my.cnf values not applying - Optimizing MySQL in CentOS LAMP

I have checked for other occurences of my.cnf and I have found only one occurrence of /etc/my.cnf. Then, I went ahead to fix in my values, e.g. query_cache_size etc. After saving and literally ...
5
votes
1answer
2k views

How do I resolve this data source connection issue with Cognos?

We have (fairly recently) installed IBM's Cognos 10 as our business intelligence reporting tool. Most of the databases that we report over are DB2 9.7 LUW Enterprise Edition. We installed the DB2 ...
4
votes
5answers
4k views

Is raid 5 suitable for a mysql installation?

Is raid 5 suitable for a mysql installation? Let me explain my application further. My application is a socket programming which will connect with gps device to receive gps string and there after do ...
4
votes
3answers
6k views

How to compare two SQL Server 2008 configurations

I have a problem with my application that works on my dev SQL Server 2008 (Developer Edition), but not on a production SQL Server 2008. Is there an easy way to export the settings from the production ...
4
votes
4answers
303 views

SQL Server Optimization/Configuration for Inflexible Application

I'm responsible for overseeing an application which uses SQL Server as its backend storage solution. Unfortunately, the application has no concept of how a RDBMS should be utilized and seems to use it ...
4
votes
3answers
4k views

MySQL slow log configuration

Is there a way of making MySQL slow logs to start new log file every day ? At the moment its just a single large file, and have to grep lines for every day. It would be much more convenient to have ...
4
votes
1answer
907 views

Make sure MySQL is not accepting remote connections

I am currently doing development for a LAMP-based website. I do not know what configuration changes have been made to MySQL since it was installed on our server. The way that we use MySQL, there is no ...
4
votes
1answer
3k views

Proper tuning for 30GB InnoDB table on server with 48GB RAM

I have a 30GB 15M rows InnoDB MySQL 5.5.15 table. It is running on a server with many other MyISAM tables (300GB db). The system has 48GB RAM. Besides the default configurations, I've changed the ...
4
votes
2answers
773 views

Listing SQL Server instance startup parameters

I have a server I have just restarted and verified which trace flag are active using DBCC TRACESTATUS: Trace Flag : 3688 Function: Removes messages to errorlog about traces started and stopped ...
4
votes
1answer
3k views

Max Memory settings on Multi-Instance SQL Server 2008 R2 Cluster

SQL Server 2008 R2 multi-instance cluster (on VMware vSphere 5.1) 2 nodes, each running 2 instances 16GB RAM per node. The only time the instances are on the same node is when I am patching the ...
4
votes
2answers
13k views

I've got 16GB of ram, how should I configure MySQL Server?

I've got a dedicated production server with multiple cpus and 16GB of ram. I would like to know how can I configure it better to take advantage of the server resources for better performance because ...
4
votes
2answers
4k views

Microsoft SQL Server 2008 Memory

I am running MSSQL 2008 Enterprise and in the configuration of the server the Max memory amount is set to 2147483647 MB. My Question is, the server has 192 GB of ram,the number in the config can't be ...
4
votes
1answer
14k views

SQL Server service account Windows privileges and rights

My question is, if you create a new domain user account for each of the SQL Server processes, what permissions should be set for each account? Or does the SQL configuration manager actually take care ...
4
votes
1answer
362 views

Oracle Database 12c: Unable to resize system tablespace

Problem: My java application is returning ORA-01691: unable to extend lob segment errors for every insert Cause: After running: SELECT * FROM dba_tablespace_usage_metrics ORDER BY used_percent ...
4
votes
6answers
5k views

MongoDB doesn't start after changing the data directory

I have installed a mongodb instance using yum.. Now everything works fine. I started the service using service mongod start. It works well. Then I changed the data directory and log path in the ...
4
votes
3answers
1k views

TNS-12541 Error

I have grid installed in my pc but the problem is LISTENER does not start automatically. I have to start listener manually and then only LISTENER get started. But before starting listener if you check ...
4
votes
0answers
33 views

How to change default port for T-SQL Debugger

The default port for T-SQL Debugger is 135, it is possible to change this port ? In my company this port is on special list of banned ports, therefore we need to open that service on another port ...