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Asked: 2026-05-14T15:47:31+00:00

I have this LAMP application with about 900k rows in MySQL and I am

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I have this LAMP application with about 900k rows in MySQL and I am having some performance issues.

Background – Apart from the LAMP stack , there’s also a Java process (multi-threaded) that runs in its own JVM. So together with LAMP & java, they form the complete solution. The java process is responsible for inserts/updates and few selects as well. These inserts/updates are usually in bulk/batch, anywhere between 5-150 rows. The PHP front-end code only does SELECT’s.

Issue – the PHP/SELECT queries become very slow when the java process is running. When the java process is stopped, SELECT’s perform alright. I mean the performance difference is huge. When the java process is running, any action performed on the php front-end results in 80% and more CPU usage for mysqld process.

Any help would be appreciated.

MySQL is running with default parameters & settings.

Software stack –

  • Apache – 2.2.x
  • MySQL -5.1.37-1ubuntu5
  • PHP – 5.2.10
  • Java – 1.6.0_15
  • OS – Ubuntu 9.10 (karmic)
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1 Answer

  1. Editorial Team

    We’d need to know a lot more about the system to say if thats normal or how to solve the problem.

    with about 900k rows in MySQL

    I would say that makes it very small – so if its performing badly then you’re going seriously wrong somewhere.

    Enable the query log to see exactly what queries are running, prioritize based on the product of frequency and duration. Have a look at the explain plans, create some indexes. Think about splitting the database across multiple disks.

    HTH

    C.

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