On Tue, Feb 7, 2017 at 11:47 AM, Haribabu Kommi <kommi.harib...@gmail.com> wrote: > Hi Hackers, > > I just want to discuss adding of a new statistics view that provides > the information of wal writing details as follows >
+1. I think it will be useful to observe WAL activity. > postgres=# \d pg_stat_wal_writer > View "pg_catalog.pg_stat_wal_writer" > Column | Type | Collation | Nullable | > Default > -----------------------+--------------------------+-----------+----------+--------- > num_backend_writes | bigint | | > | > num_total_writes | bigint | | | > num_blocks | bigint | | | > total_write_time | bigint| | | > stats_reset | timestamp with time zone | | | > > The columns of the view are > 1. Total number of xlog writes that are called from the backend. > 2. Total number of xlog writes that are called from both backend > and background workers. (This column can be changed to just > display on the background writes). > 3. The number of the blocks that are written. > 4. Total write_time of the IO operation it took, this variable data is > filled only when the track_io_timing GUC is enabled. So, here is *write_time* the total time system has spent in WAL writing before the last reset? I think there should be a separate column for write and sync time. > Or it is possible to integrate the new columns into the existing > pg_stat_bgwriter view also. > I feel separate view is better. -- With Regards, Amit Kapila. EnterpriseDB: http://www.enterprisedb.com -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
