Henri, prefix your query with TRACE, i.e., TRACE select clob from x where varchar in ('a','b','c'); to produce a detailed performance trace that tells you and us where time goes in your case. Stefan On Fri, May 08, 2009 at 11:12:37AM +0300, Henri Asseily wrote:

Hi, I've got a very simple table structure in SQL, with a non-unique varchar field and a few other fields including a CLOB. I found that it's abnormally slow to filter the varchar field with an 'IN' statement and simply return the CLOB. i.e.: select clob from x where varchar in ('a','b','c')

With a couple million rows, the query is in multiple seconds if the results are around a couple thousand rows. Is there something I'm doing wrong? I should be just the varchar BAT filter, then join on the CLOB BAT. Should I manually assign the varchars to integers in another table and use ints on this table? That would be surprising...

Thanks. H

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