Questions tagged [configuration]

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

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67
votes
8answers
44k views

MAXDOP setting algorithm for SQL Server

When setting up a new SQL Server, 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 NUMA ...
5
votes
5answers
6k 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

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 ...
5
votes
1answer
5k 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 ...
5
votes
2answers
18k 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. How can I configure it to take advantage of server resources for better performance? Website traffic is increasing and MySQL ...
31
votes
5answers
21k 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 ...
10
votes
2answers
2k 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 ...
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 ...
12
votes
1answer
43k 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 ...
6
votes
4answers
19k views

SQL Server 2008: how much RAM memory should SQL Server use in a 8GB RAM server?

We have SQL Server 2008 and 8GB RAM in a customer, hosted in a Windows 2008 R2 SP1, and consider the following amount of free memory: and consider the following running programs: Scenario: Users ...
35
votes
4answers
43k views

ALLOW_SNAPSHOT_ISOLATION and READ_COMMITTED_SNAPSHOT

Most of the forum and example online always suggest to have both ALLOW_SNAPSHOT_ISOLATION and READ_COMMITTED_SNAPSHOT set to ON whenever someone is asking snapshot, row versioning or similar question. ...
41
votes
3answers
61k views

What is the search_path for a given database and user?

I can see the current search_path with: show search_path ; And I can set the search_path for the current session with: set search_path = "$user", public, postgis; As well, I can permanently set ...
13
votes
1answer
20k views

What are the optimal mysqldump settings? [closed]

After some search I ended up with the following settings: mysqldump\ --host=localhost\ --port=3306\ --databases ****\ --user=****\ --password=****\ --default-character-set=...
9
votes
4answers
40k views

Why does MySQL say I'm out of memory?

I was trying to execute a fairly large INSERT...SELECT in MySQL with JDBC, and I got the following exception: Exception in thread "main" java.sql.SQLException: Out of memory (Needed 1073741824 bytes) ...
14
votes
3answers
13k 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 reads....
6
votes
2answers
31k 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 --test=/usr/share/doc/...
4
votes
2answers
37k views

When should I NOT set the Maximum Server Memory option in SQL Server?

In SQL Server, I normally set the Maximum Server Memory setting to one of the popular best practices, such as leaving 10% or 4GB, whichever is higher. http://www.brentozar.com/archive/2012/11/how-to-...
3
votes
2answers
8k views

How to define custom path to MySQL socket file?

I have following config [mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql-socket/mysql.sock user=mysql # Disabling symbolic-links is recommended to prevent assorted security risks symbolic-links=...
3
votes
2answers
615 views

Can I configure MySQL's typecasting to consider 0 != 'foo'?

This article points out the following security problem with MySQL: USERS id | email | password_reset_token 1 | one@example.com | QTlXww)uV!Hdg3U6aGwKV2FPvAqzVgPx 2 | two@example.com | ...
5
votes
1answer
876 views

Disabling SET Statements / Forcing SET Options in SQL Server 2008R2/2012

I am currently working with a MSSQL 2008R2 Database which uses the following SET-Commands frequently: SET ANSI_NULLS { ON | OFF } SET QUOTED_IDENTIFIER { ON | OFF } SET ANSI_PADDING { ON | OFF } ...
38
votes
3answers
42k views

How do you calculate mysql max_connections variable?

How do you calculate mysql max_connections ? What do you take into consideration ?
14
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3answers
34k views

MySQL InnoDB page_cleaner settings might not be optimal

Seeing this note in mysqld.log: [Note] InnoDB: page_cleaner: 1000ms intended loop took 15888ms. The settings might not be optimal. (flushed=200 and evicted=0, during the time.) There seems to be ...
7
votes
2answers
8k 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 ...
11
votes
2answers
27k 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 ...
6
votes
1answer
434 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 ...
6
votes
3answers
5k 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 (4 instances in total) 16GB RAM per node. The only time the instances are on the same node is when ...
22
votes
5answers
10k 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 ...
15
votes
1answer
14k views

Understanding “max_wal_size” and “min_wal_size” parameters default values from postgresql.conf file

Default values are, according to documentation for min_wal_size and max_wal_size parameters: For max_wal_size: The default is 1 GB For min_wal_size: The default is 80 MB Then I look this parameters ...
9
votes
1answer
584 views

Will Changing the Max Memory Setting Invalidate Query Plans?

I recently lowered the max memory from the default (unlimited) down to 20 GB. Does this erase the oldest queries in the plan cache?
6
votes
1answer
3k views

Moving DB Log destination?

I currently have SQL DB and Log files going to the same drive. I would like to move the Log files to their own drive. Is there an easy way to achieve this and will it require downtime/reboot of the ...
2
votes
1answer
2k views

When upgrading config servers to use WireTiger, the running config server with wiredtiger does not authenticate the existing pass and user?

In order to upgrade mongodb to 3.0.0, I am upgrading my config servers to use WireTiger. I followed the subsection of Change Config Server to Use WiredTiger. There are 18 steps. I run mongodump --port ...
1
vote
2answers
683 views

Recommended Auto Grow settings suitable for database whose size is 867666.25 MB [closed]

I need recommendations for setting/modifying the auto grow options for our production database. size of FUNDSDB 867666.25 MB Also, I have attached the current autogrowth statistics , looks like ...
1
vote
1answer
464 views

How can lots of ram (128 GB) be used to improve MySQL 5.5 index creation?

This is similar to another post of mine, but now I have a different table structure, and it's still unclear what MySQL parameters should be changed to take advantage of the extra ram my machine has---...
1
vote
2answers
6k views

Mysql Server 5.6 Mysqld high memory consumption

I have MySQL Server 5.6 installed in a development machine with these specs: RAM: 4 GB Windows 7 Professional 64 bits Intel Pentium CPU G630 @ 2.70 GHZ Since I installed the MySQL Server, the ...
15
votes
3answers
8k views

Why don't my .my.cnf settings work?

I have a .my.cnf file in my home directory on my desktop that includes: [dbid] user = myusername password = mypassword database = dbname host = server.location.com If I recall correctly, before ...
9
votes
3answers
1k views

Always On Availability Group, Always redirect user to read only instance

We have an Always On availability group with a primary and a read-enabled secondary. We have a user for the implementation team who uses the database to check the correctness of the data that they are ...
7
votes
1answer
2k views

Application Settings in Database

In the past I have stored all generic settings and configuration items such as: custom application title, home address, version, debug, etc.. all in a "settings.php" file that I would include into all ...
6
votes
1answer
1k views

SSAS - what could be a good starting point for memory settings?

I have received the following alert regarding memory settings of SSAS: Alert: SSAS 2014: Invalid TotalMemoryLimit Configuration Source: MSSQLSERVER Path: SASBI01Alert time: 9/15/2015 5:38:50 PM ...
6
votes
2answers
611 views

Seperate volumes for tempdb, data, and backups on SQL Servers in VMs

When configuring new SQL Servers on VMs, it is a good idea to have the Database, TempDB, logs, and backups on separate logical drives, even if the underlying storage is the same? I know that this is a ...
5
votes
2answers
16k views

How to set a specific directory location for individual MySQL database?

Is it possible to set each database in MySQL to use a separate datadir? I'm running a userdir development (sandbox) server and would like to put the MySQL data files for the database(s) for that user ...
5
votes
2answers
2k views

Configure SQL Server Analysis Services (SSAS) to run on same IP as SQL Server instance

TL;DR I would like to add SQL Server 2014 Analysis Services to a specific instance of SQL Server and to configure it in such a way, that the Analysis Services (SSAS) and future Reporting Services (...
3
votes
1answer
704 views

Multi-instance SQL Server Standard Editon MaxDop settings

You read the title and are still confused? Well I am too. I've just started a new job as DBA for a new employer and have come across some creative ways of installing SQL Server. My previous ...
3
votes
2answers
5k views

How to add setParameter in mongod config?

When I am using setParameter in mongod config, I start mongod with error: Unrecognized option: setParameter = enableLocalhostAuthBypass=1 How can I use setParameter from config file ? P/S: I am ...
3
votes
2answers
2k views

SSDs and 64K sectors

SSDs tend to have a natural 4K sector size as far as I know, but would it be beneficial to format Windows cluster size at 64K? This is good practice for spinning rust, but is it relevant on SSDs?
2
votes
1answer
2k views

Something wrong in pg_hba.conf

this my configuration: #postgres.conf: listen_addresses = 'localhost' #pg_hba.conf: local all postgres md5 local all appuser trust local all devuser trust local all all peer i'm connecting in ...
6
votes
1answer
415 views

How can “HierarchyID” type work when “CLR” is disabled?

The following statement sp_configure 'clr enabled' returns: name minimum maximum config_value run_value clr enabled 0 1 0 0 I assume this means there are no CLR ...
5
votes
5answers
17k 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 ...
5
votes
1answer
10k 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 ...
4
votes
1answer
2k views

how to query the plan cache to find how healthy it is?

This morning looking at my monitoring tool I get a warning about High Compiles Query plan compiles should generally be <15% of batches per second. Higher values indicate plan reuse is low, and ...
4
votes
3answers
5k 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 ...