Emergency

Monthly Archives: August 2008

New MySQL Community release – Great job MySQL !

Wow!. New MySQL Community release – MySQL 5.0.67 is just out which as manual says first community release since 5.0.51b. I just recently complained about community release irregularity and I’m glad to see the new …

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Predicting Performance improvements from memory increase

One common question I guess is how much should I see performance improved in case I increase memory say from 16GB to 32GB. The benefit indeed can be very application dependent – if you have …

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Will Percona Support Drizzle ?

People are asking me if Percona will support Drizzle and what is in general our position regarding this project. First about Support. We surely will support the customers if they select to run the Drizzle …

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128GB or RAM finally got cheap

I did not usually go to “Elite” servers on Dell web site but looking at customers system today I went to check Dell Poweredge R900. This monster takes up to 4 Quad Core CPUs and …

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To find the bottleneck, stop guessing and start measuring

We recently examined a customer’s system to try to speed up an ETL (Extraction, Transformation and Loading) process for a big data set into a sort of datamart or DW.  What we typically do is …

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Userstats patches with information schema support

Recently, we added information schema support to Google’s userstats patch. There are three information schema tables added: user_statistics, table_statistics, index_statistics. One can now use select * from information_schema.user_statistics along with show user_statistics. Links: Patch for …

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Recovery beyond data restore

Quite frequently I see customers looking at MySQL recovery as on ability to restore data from backup which can be far from being enough to restore the whole system to operating state, especially for complex …

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Troubleshooting Relay Log Corruption in MySQL

Have you ever seen the replication stopped with message like this: Last_Error: Could not parse relay log event entry. The possible reasons are: the master’s binary log is corrupted (you can check this by running …

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How adding another table to JOIN can improve performance ?

JOINs are expensive and it most typical the fewer tables (for the same database) you join the better performance you will get. As for any rules there are however exceptions The one I’m speaking about …

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Percona turns two today !

July 31st 2006 was my last day working for MySQL and August 1st I started what later was incorporated Percona with Vadim joining me September 1st as co-founder. Two years is a significant anniversary for …

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