>> >> hello >> >> >> >> after 2 weeks pgpool-II (2.25) was working good, >> >> I now have: >> >> 'kind mismatch among backends. Possible last query was: "EXPLAIN >> SELECT >> >> * >> >> FROM ycore.transfer_record WHERE >> >> transfer_record_id>400" kind details are: 0[D] 1[C]' >> >> >> >> just when we wanted to move to production. >> >> >> >> all other things still work, also 'EXPLAIN' on other tables, >> >> (also same query on this table worked until now) >> >> I have full logs of pgpool + 2 postgres backends >> >> how can I find out whats wrong ? >> > >> > Can you show me the outputs of EXPAIN which are executed directly on >> > postgres backends? My bet is, there are dead tuples difference between >> > backends which cause execution plan differences. >> > -- >> > Tatsuo Ishii >> > SRA OSS, Inc. Japan >> > >> >> backend 0: >> >> explain select * from ycore.transfer_record where transfer_record_id > >> 400; >> QUERY PLAN >> ----------------------------------------------------------------------------------------- >> Bitmap Heap Scan on transfer_record (cost=4.60..20.16 rows=45 >> width=356) >> Recheck Cond: (transfer_record_id > 400) >> -> Bitmap Index Scan on idx_tr_transfer_record_id (cost=0.00..4.59 >> rows=45 width=0) >> Index Cond: (transfer_record_id > 400) >> (4 rows) >> >> >> backend 1: >> >> explain select * from ycore.transfer_record where transfer_record_id > >> 400; >> QUERY PLAN >> ------------------------------------------------------------------- >> Seq Scan on transfer_record (cost=0.00..24.48 rows=49 width=331) >> Filter: (transfer_record_id > 400) >> (2 rows) >> >> >> >> I can see there is a difference, but i don't know how to check what >> caused >> it, and how to avoid it next time. > > Please make sure that you have idx_tr_transfer_record_id index on > backend 1. If you already have, please try vacuum analyze on the > database directly on backend 1. > -- > Tatsuo Ishii > SRA OSS, Inc. Japan >
I have 'idx_tr_transfer_record_id' index on both backends, i ran vacumm analyze as user postgres on backend 1: vacuumdb --verbose --analyze --table transfer_record spy INFO: vacuuming "ycore.transfer_record" INFO: scanned index "transfer_record_pkey" to remove 14 row versions DETAIL: CPU 0.00s/0.00u sec elapsed 0.00 sec. INFO: scanned index "idx_tr_core_req_req_id" to remove 14 row versions DETAIL: CPU 0.00s/0.00u sec elapsed 0.53 sec. INFO: scanned index "idx_tr_transfer_record_id" to remove 14 row versions DETAIL: CPU 0.00s/0.00u sec elapsed 0.00 sec. INFO: "transfer_record": removed 14 row versions in 6 pages DETAIL: CPU 0.00s/0.00u sec elapsed 0.00 sec. INFO: index "transfer_record_pkey" now contains 445 row versions in 4 pages DETAIL: 14 index row versions were removed. 0 index pages have been deleted, 0 are currently reusable. CPU 0.00s/0.00u sec elapsed 0.00 sec. INFO: index "idx_tr_core_req_req_id" now contains 445 row versions in 4 pages DETAIL: 14 index row versions were removed. 0 index pages have been deleted, 0 are currently reusable. CPU 0.00s/0.00u sec elapsed 0.00 sec. INFO: index "idx_tr_transfer_record_id" now contains 445 row versions in 4 pages DETAIL: 14 index row versions were removed. 0 index pages have been deleted, 0 are currently reusable. CPU 0.00s/0.00u sec elapsed 0.00 sec. INFO: "transfer_record": found 9 removable, 446 nonremovable row versions in 19 pages DETAIL: 1 dead row versions cannot be removed yet. There were 53 unused item pointers. 9 pages contain useful free space. 0 pages are entirely empty. CPU 0.00s/0.00u sec elapsed 0.55 sec. INFO: vacuuming "pg_toast.pg_toast_17250" INFO: index "pg_toast_17250_index" now contains 0 row versions in 1 pages DETAIL: 0 index row versions were removed. 0 index pages have been deleted, 0 are currently reusable. CPU 0.00s/0.00u sec elapsed 0.00 sec. INFO: "pg_toast_17250": found 0 removable, 0 nonremovable row versions in 0 pages DETAIL: 0 dead row versions cannot be removed yet. There were 0 unused item pointers. 0 pages contain useful free space. 0 pages are entirely empty. CPU 0.00s/0.00u sec elapsed 0.00 sec. INFO: analyzing "ycore.transfer_record" INFO: "transfer_record": scanned 19 of 19 pages, containing 445 live rows and 1 dead rows; 445 rows in sample, 445 estimated total rows after this, everything remains the same. (EXPLAIN output, kind mismatch) _______________________________________________ Pgpool-general mailing list [email protected] http://pgfoundry.org/mailman/listinfo/pgpool-general
