Performance tuning done by adjusting database parameters or physical layout of the database.

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369 views

Postgres query plans and tuning parameters

I have a query for which the explain plan indicates that the cost for using a seq scan is lower than the cost for using an index that I have set up. However the actual time for the query is 20 times ...
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1answer
270 views

Tuning Mysql and Monitoring

I would like to know if anybody can point me towards a tool/way for MySQL database tuning. Actually the tuning of my.cnf is like below: My database engine is MyISAM | Mysql 5.1.73 key_buffer = ...
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1answer
172 views

Please suggest my.cnf configuration based upon mysqltuner findings

I have been facing a lot of slow browsing on my site nerdeky.com. My server administrator suggested me to use mysqltuner.pl to find and tune my databases. Can anyone select me what should be the good ...
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1answer
70 views

Creating a flexible table containing prices and periodes

I'm creating a system of availability for rooms and with a calendar according to the days, with every day have it's own price. Room Type | 01 | 02 | 03 | 04 | 05 | ... | 31 | -------------...
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330 views

MySQL uses more than 500% of the CPU

Everything was going fine, but since a couple of hours ago MySQL is using from 400% to 550% of the CPU. I'm getting a lot of these errors: 1003 14:03:17 [ERROR] /usr/sbin/mysqld: Incorrect key file ...
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29 views

Tuning Issue / Temporary Tables

I've got a MySQL database (MyISAM) that handles a lot of read/writes and uses temporary tables quite frequently. Recently it's started having massive load spikes at peak load, and noticed that there ...
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852 views

SQL Server Database Engine Tuning Advisor vs DMV queries

What is the best way to tune the indexes on my production database? I normally use the following query : SELECT user_seeks * avg_total_user_cost * (avg_user_impact * 0.01) AS [index_advantage], ...
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59 views

Tuning MySQL MyISAM for large joined updates

I have a database with two tables that I would consider small. I need to update values on the larger of the two tables (1,100,000 rows, 75M MYD, 120M MYI) from the join of the two tables. The smaller ...
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136 views

Tuning MySQL On Azure Windows Server Setup

I have a MySQL 5.5 running on Azure VM Windows Server 2012. Once per second the log db gets about 2K inserts through LOAD DATA INFILE... once a day I need to run stats and when the stats are crunching ...
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733 views

Optimization Tips For MYSQL Tuner/Primer

So I have a site that has a crap ton of traffic. I see a decent amount of latency when the site has over 1,000 active visitors on it. I have new relic installed and it seems Im only using 10% of the ...
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8k views

Could Oracle ORA-08103 'object no longer exists' error be caused by size of undo_retention parameter?

Had a once-a-day long running data warehousing procedure that I had written that was failing about 50% of the time. Logs were showing ORA-08103 'object no longer exists'. ORA-12012: error on auto ...
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294 views

MySQL suddenly running very very slowly

I run a PHP/MySQL website on a fairly large server with 16GB RAM and 3 vCPUs. Everything was flying along until this morning when I noticed MySQL down. I tried to restart MySQL and first got the ...
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19 views

Innodb Change Buffer merge

I have been testing the performance of my innodb mysql. I ran a script which inserts and selects one after the other for 100000 times. So according to the change buffer concept, the inserted ...
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51 views

Mysql - too many Deletion - Insertion

I'm creating cron jobs for my OLAP system. I have a cron job that deletes the records from the summary table first and then insert the records in it again: Say Deleting 1 month records, and ...
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300 views

Plesk 12 Debian 7 MySQL CPU usage is too high

I have a problem with MySQL and MySQL CPU usage at Plesk. I have a news site with Joomla, and about 100-150 online user. CPU: AMD Opteron(tm) Processor 6366 HE 3 core Memory: 4GB HDD: 250 GB Plesk 12 ...
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228 views

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

This query is almost the same as this question. But in this case, a configuration to make the master perform faster or just the same. Case We have a Master-Slave setup on a Mysql 5.0.77 - MariaDB 5....
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30 views

MySQL 5.5 only use 1 thread and 30% cpu

i have a big issue, every day i need to update or insert like 3.3 milion rows, i have trying to do what ever i can but it still only run like 605 query/s i use VirtualBox so my setup are testing on 1, ...
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116 views

Performance issue after reorganizing table in MYSQL

There is MYSQL(5.6.22-log Community Edition) database environment which has databases size varies between 1-40GB and using INNODB storage engine, it's serves for the several number of OLTP based ...
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306 views

After RAM upgrade on 32-bit Oracle server, ORA-04031: unable to allocate x bytes of shared memory

We are in the process of upgrading our Oracle database server at work, from SUSE Linux Enterprise Server 10.4 / Oracle 10g / 4GB RAM (Intel 32-bit) to Scientific Linux 6.4 / Oracle 12c / 8GB RAM (...
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505 views

PostgreSQL can't start after tuning some options

I'm having some issues with "too many clients" and I tried to change the max_connections param (currently 100). I tried to set some value like 300, but when I restart the service, I got this ...
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50 views

Oracle User Profile for REST API

What sort of profile would you recommend for an Oracle user that is manifested through a RESTful API; particularly where there will be a lot of asynchronous requests? So we're talking about a ...