Hi, We've observed a severe performance regression in a query.
We had a query Q1, which was running fast, on 3.7.15.2. We made a minor change to the query, which we'll call Q2. Q2 runs excruciatingly slowly in 3.7.15.2 (1m 28sec). We then observed that Q2 was fast in 3.7.14 (300ms), but slow in 3.7.15.2 and later (tested up until 3.7.17). The slow query Q2 can be found in a test program here ~ http://www.plexapp.com/elan/test.c The database which shows the slow query in action is here ~ http://www.plexapp.com/elan/com.plexapp.plugins.library.db-slow.zip The crux of the query which makes it pathologically slow in 3.7.15+ appears to be this bit: "join metadata_item_settings on metadata_item_settings.guid=grandchild.guid ****and metadata_item_settings.account_id=1****". If I take out the account_id bit, it's then fast on every version. Where is it spending all this time? I'm glad you asked: https://dl.dropbox.com/s/vnfv5n7m2vgn1p4/2013-06-26%20at%202.21.58%20PM.png Please let me know if you have any other questions! -elan _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
