This is typical. Until you do a vacuum the old versions of a row are
still in the db, so an update has to do an index query on an index to
get to the row that needs indexing, which returns a lot of pointers to
old entries, that then have to be tranversed until the valid one in
found. Then the update makes one more invalid row.
mike@mwcs.mb.ca wrote:
> I am having some performance problems with postgresql and JDBC when it
> comes to updates. If I try and update a record it seems to be taking 1.7
> seconds for 100 records or 14 seconds for 500 records. An insert is only
> taking between 3-5 ms/record. Performance on the updates continue to
> decrease until I vacuum analyze the database again. Is this normal?
>
> Mike
>
>
>
>
--
Joseph Shraibman
jks@selectacast.net
Increase signal to noise ratio. http://www.targabot.com