Hello Igor, this is not the complete query - only the part which causes the problem. The complete query is: SELECT DISTINCT interfaces_int_id,device_dev_id FROM devInterface INNER JOIN interfaces ON devInterface.interfaces_int_id=interfaces.intf_id INNER JOIN nlink ON nlink.interfaces_intf_id=interfaces.intf_id INNER JOIN neighbor ON neighbor.neighbor_id=nlink.neighbor_neighbor_id WHERE neighbor.l2_addr IN ( SELECT macAddress FROM interfaces INNER JOIN devInterface ON devInterface.interfaces_int_id=interfaces.intf_id
INNER JOIN device ON device.dev_id=devInterface.device_dev_id WHERE devInterface.device_dev_id=1 AND interfaces.l2l3 LIKE 'L2' AND device.hwtype=2) But when removing the 2nd part, the query time is the same. The second part itself is very fast. Regards, Mathias -----Ursprüngliche Nachricht----- Von: sqlite-users-boun...@sqlite.org [mailto:sqlite-users-boun...@sqlite.org] Im Auftrag von Igor Tandetnik Gesendet: Montag, 18. April 2011 15:55 An: sqlite-users@sqlite.org Betreff: Re: [sqlite] Performance issues with sqlite3 sqlite3_step function Mathias Spoerr <math...@spoerr.org> wrote: > I have problems with a specific query when using the "sqlite3_step" > function: > > SELECT DISTINCT interfaces_int_id,device_dev_id FROM devInterface > > INNER JOIN interfaces ON > devInterface.interfaces_int_id=interfaces.intf_id > > INNER JOIN nlink ON nlink.interfaces_intf_id=interfaces.intf_id > > INNER JOIN neighbor ON neighbor.neighbor_id=nlink.neighbor_neighbor_id Why are you joining with all these tables, when the two fields you want to select both belong to devInterface? Why not simply SELECT DISTINCT interfaces_int_id,device_dev_id FROM devInterface; -- Igor Tandetnik _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
