Valerie Schneider DSI/DEV wrote:
> Hi, > I 've decreased the sort_mem to 5000 instead of 50000. > I recreated ma table using integer and real types instead of > numeric : the result is very improved for the disk space : > > schema | relfilenode | table | index | reltuples | size > --------+-------------+------------------+------------+-------------+---------- > public | 253442696 | data | | 1.25113e+08 | 29760016 > public | 378639579 | data | i_data_dat | 1.25113e+08 | 2744400 > public | 378555698 | data | pk_data | 1.25113e+08 | 3295584 > > so it takes about 28 Gb instead of 68 Gb ! > > For my different queries, it's better but less performant than oracle : > > oracle PG yesterday(numeric) PG today(integer/real) > Q1 <1s <1s <1s > Q2 3s 8s 4s > Q3 8s 1m20s 27s > Q4 28s 17m20s 6m47s
Are you using the same disk for oracle and PG ?
Could you post your actual postgresql.conf ? Try also to mount your partition with the option: noatime and try again.
Regards Gaetano Mendola
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