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Q: 

Is JDBC Connection aquiring with MySQL slower than with e.g. Derby ?

I use

  • Tomcat
  • C3p0 (JNDI configured inside Tomcat)
  • MySQL(InnoDB) / Derby(not embedded) as Database
  • EHCache (in Memory)
  • Hibernate
  • Testmachine runs WinXP

I used Derby for development and wanted to switch to MySQL.

I was surprised to see, that with MySQL my Tests were app. 50% slower than with Derby.

My Testscenario :

  • app. 2000 Selects, varying in complexity but none used more than one join, all SQLs use Indexes
  • ehcache is filled up with a setup Run, after that i run the Testscenario at least 50x to overcome Optimizer/GC Effects

i verified that the cache is in use, there are NO real SQLs coming to the database, so i just guess its the connection creation time which slows the mysql test down.

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