Hi all, Thanks for your replies.
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I ran a very prelimnary test, and found following results. I feel they are wierd and I dont know what I am doing wrong !!! I made a schema with 5 tables. I have a master data table with foreign keys pointing to other 4 tables. Master data table has around 4 million records. When I run a select joining it with the baby tables, postgres -> returns results in 2.8 seconds mysql -> takes around 16 seconds !!!! (This is with myisam ... with innodb it takes 220 seconds) I am all for postgres at this point, however just want to know why I am getting opposite results !!! Both DBs are on the same machine Thanks, Amit -----Original Message----- From: Jeffrey Tenny [mailto:[EMAIL PROTECTED] Sent: Monday, June 06, 2005 11:51 AM To: pgsql-performance@postgresql.org Subject: Re: [PERFORM] Need help to decide Mysql vs Postgres Re: your JDBC wishes: Consider IBM Cloudscape (now Apache Derby) too, which has an apache license. It's all pure java and it's easy to get going. As to MySql vs Postgres: license issues aside, if you have transactionally complex needs (multi-table updates, etc), PostgreSQL wins hands down in my experience. There are a bunch of things about MySQL that just suck for high end SQL needs. (I like my subqueries, and I absolutely demand transactional integrity). There are some pitfalls to pgsql though, especially for existing SQL code using MAX and some other things which can really be blindsided (performance-wise) by pgsql if you don't use the workarounds. MySQL is nice for what I call "raw read speed" applications. But that license is an issue for me, as it is for you apparently. Some cloudscape info: http://www-306.ibm.com/software/data/cloudscape/ Some info on pitfalls of MySQL and PostgreSQL, an interesting contrast: http://sql-info.de/postgresql/postgres-gotchas.html http://sql-info.de/mysql/gotchas.html ---------------------------(end of broadcast)--------------------------- TIP 2: you can get off all lists at once with the unregister command (send "unregister YourEmailAddressHere" to [EMAIL PROTECTED]) ---------------------------(end of broadcast)--------------------------- TIP 9: the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
