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Would really appreciate someone taking a look at the query
below.... Thanks in advance! this is on a linux box... Linux dsrvr201.larc.nasa.gov 2.6.18-164.9.1.el5 #1 SMP Wed Dec 9 03:27:37 EST 2009 x86_64 x86_64 x86_64 GNU/Linux explain analyze select MIN(IV.STRTDATE), MAX(IV.ENDDATE) from GRAN_VER GV left outer join INVENTORY IV on GV.GRANULE_ID = IV.GRANULE_ID, INVSENSOR INVS where IV.INV_ID='65' and GV.GRANULE_ID = INVS.granule_id and INVS.sensor_id='13' "Aggregate (cost=736364.52..736364.53 rows=1 width=8) (actual time=17532.930..17532.930 rows=1 loops=1)" " -> Hash Join (cost=690287.33..734679.77 rows=336949 width=8) (actual time=13791.593..17323.080 rows=924675 loops=1)" " Hash Cond: (invs.granule_id = gv.granule_id)" " -> Seq Scan on invsensor invs (cost=0.00..36189.41 rows=1288943 width=4) (actual time=0.297..735.375 rows=1277121 loops=1)" " Filter: (sensor_id = 13)" " -> Hash (cost=674401.52..674401.52 rows=1270865 width=16) (actual time=13787.698..13787.698 rows=1270750 loops=1)" " -> Hash Join (cost=513545.62..674401.52 rows=1270865 width=16) (actual time=1998.702..13105.578 rows=1270750 loops=1)" " Hash Cond: (gv.granule_id = iv.granule_id)" " -> Seq Scan on gran_ver gv (cost=0.00..75224.90 rows=4861490 width=4) (actual time=0.008..1034.885 rows=4867542 loops=1)" " -> Hash (cost=497659.81..497659.81 rows=1270865 width=12) (actual time=1968.918..1968.918 rows=1270750 loops=1)" " -> Bitmap Heap Scan on inventory iv (cost=24050.00..497659.81 rows=1270865 width=12) (actual time=253.542..1387.957 rows=1270750 loops=1)" " Recheck Cond: (inv_id = 65)" " -> Bitmap Index Scan on inven_idx1 (cost=0.00..23732.28 rows=1270865 width=0) (actual time=214.364..214.364 rows=1270977 loops=1)" " Index Cond: (inv_id = 65)" "Total runtime: 17533.100 ms" some additional info..... the table inventory is about 4481 MB and also has postgis types. the table gran_ver is about 523 MB the table INVSENSOR is about 217 MB the server itself has 32G RAM with the following set in the postgres conf shared_buffers = 3GB work_mem = 64MB maintenance_work_mem = 512MB wal_buffers = 6MB let me know if I've forgotten anything! thanks a bunch!! Maria Wilson NASA/Langley Research Center Hampton, Virginia m.l.wilson@xxxxxxxx |
