I'm converting a relatively small database (2 MB) from MySQL to PostgreSQL. It is used to generate web pages using PHP. Although the actual website runs under Linux, the development is done under XP. I've completed most of the data conversion and rewrite of the PHP scripts, so now I'm comparing relative performance.

It appears that PostgreSQL is two to three times slower than MySQL. For example, some pages that have some 30,000 characters (when saved as HTML) take 1 to 1 1/2 seconds with MySQL but 3 to 4 seconds with PostgreSQL. I had read that the former was generally faster than the latter, particularly for simple web applications but I was hoping that Postgres' performance would not be that noticeably slower.


I'm trying to determine if the difference can be attributed to anything that I've done or missed. I've run VACUUM ANALYZE on the two main tables and I'm looking at the results of EXPLAIN on the query that drives the retrieval of probably 80% of the data for the pages in question.

Before I post the EXPLAIN and the table schema I'd appreciate confirmation that this list is the appropriate forum. I'm a relative newcomer to PostgreSQL (but not to relational databases), so I'm not sure if this belongs in the novice or general lists.

Joe


---------------------------(end of broadcast)---------------------------
TIP 9: In versions below 8.0, the planner will ignore your desire to
      choose an index scan if your joining column's datatypes do not
      match

Reply via email to