diff options
| author | Fujii Masao <fujii@postgresql.org> | 2021-06-30 20:57:07 +0900 |
|---|---|---|
| committer | Fujii Masao <fujii@postgresql.org> | 2021-06-30 20:57:07 +0900 |
| commit | 3465c8a8692fb628bc2710fbeedb9aeb534b0400 (patch) | |
| tree | 8dd124ec49c3453169de39a34076963acabbf6e9 /contrib/postgres_fdw/sql | |
| parent | 61d599ede7424d88bbd4006b968bae366b6b9f5d (diff) | |
| download | postgresql-3465c8a8692fb628bc2710fbeedb9aeb534b0400.tar.gz postgresql-3465c8a8692fb628bc2710fbeedb9aeb534b0400.zip | |
doc: Improve descriptions of tup_returned and tup_fetched in pg_stat_database
Previously the descriptions of tup_returned and tup_fetched columns
in pg_stat_database view were confusing. This commit improves them
so that they represent the following formulas of those columns
more accurately.
* pg_stat_database.tup_returned
= sum(pg_stat_all_tables.seq_tup_read)
+ sum(pg_stat_all_indexes.idx_tup_read)
* pg_stat_database.tup_fetched
= sum(pg_stat_all_tables.idx_tup_fetch)
In these formulas, note that the counters for some system catalogs
like pg_database shared across all databases of a cluster are excluded
from the calculations of sum.
Author: Masahiro Ikeda
Reviewed-by: Fujii Masao
Discussion: https://postgr.es/m/9eeeccdb-5dd7-90f9-2807-a4b5d2b76ca3@oss.nttdata.com
Diffstat (limited to 'contrib/postgres_fdw/sql')
0 files changed, 0 insertions, 0 deletions