Cedric Villemain <cedric.villem...@dalibo.com> wrote: > Le vendredi 18 decembre 2009 09:44:40, Takahiro Itagaki a ecrit : > > I'd like to add per-query buffer usage into contrib/pg_stat_statements.
Here is a patch to add buffer usage columns into pg_stat_statements. It also changes initialzation of the result TupleDesc from manually coded routines to get_call_result_type(). > Perhaps it can be usefull to have the percentage for hit/read ratio computed > in the view ? I think different DBAs want different derived values; Some of them might want the buffer hit ratio, but others might request numbers per query. I'd like to privide only raw values from pg_stat_statements to keep it simple, but I added a computational expression of hit percentage in the documentation. ! bench=# SELECT query, calls, total_time, rows, 100.0 * shared_blks_hit / ! nullif(shared_blks_hit + shared_blks_read, 0) AS hit_percent ! FROM pg_stat_statements ORDER BY total_time DESC LIMIT 5; ! -[ RECORD 1 ]--------------------------------------------------------------------- ! query | UPDATE pgbench_branches SET bbalance = bbalance + $1 WHERE bid = $2; ! calls | 3000 ! total_time | 9.60900100000002 ! rows | 2836 ! hit_percent | 99.9778970000200936 Regards, --- Takahiro Itagaki NTT Open Source Software Center
pg_stat_statements_bufusage_20091222.patch
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