diff options
Diffstat (limited to 'doc/src/sgml/monitoring.sgml')
| -rw-r--r-- | doc/src/sgml/monitoring.sgml | 31 |
1 files changed, 26 insertions, 5 deletions
diff --git a/doc/src/sgml/monitoring.sgml b/doc/src/sgml/monitoring.sgml index 3dfd059b7ee..9178f1d34ef 100644 --- a/doc/src/sgml/monitoring.sgml +++ b/doc/src/sgml/monitoring.sgml @@ -184,6 +184,11 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser </para> <para> + The parameter <xref linkend="guc-track-wal-io-timing"/> enables monitoring + of WAL read, write and fsync times. + </para> + + <para> Normally these parameters are set in <filename>postgresql.conf</filename> so that they apply to all server processes, but it is possible to turn them on or off in individual sessions using the <xref @@ -2723,7 +2728,11 @@ description | Waiting for a newly initialized WAL file to reach durable storage </para> <para> Time spent in read operations in milliseconds (if - <xref linkend="guc-track-io-timing"/> is enabled, otherwise zero) + <xref linkend="guc-track-io-timing"/> is enabled and + <varname>object</varname> is not <literal>wal</literal>, + or if <xref linkend="guc-track-wal-io-timing"/> is enabled + and <varname>object</varname> is <literal>wal</literal>, + otherwise zero) </para> </entry> </row> @@ -2757,7 +2766,11 @@ description | Waiting for a newly initialized WAL file to reach durable storage </para> <para> Time spent in write operations in milliseconds (if - <xref linkend="guc-track-io-timing"/> is enabled, otherwise zero) + <xref linkend="guc-track-io-timing"/> is enabled and + <varname>object</varname> is not <literal>wal</literal>, + or if <xref linkend="guc-track-wal-io-timing"/> is enabled + and <varname>object</varname> is <literal>wal</literal>, + otherwise zero) </para> </entry> </row> @@ -2816,8 +2829,12 @@ description | Waiting for a newly initialized WAL file to reach durable storage <structfield>extend_time</structfield> <type>double precision</type> </para> <para> - Time spent in extend operations in milliseconds (if - <xref linkend="guc-track-io-timing"/> is enabled, otherwise zero) + Time spent in extend operations in milliseconds. (if + <xref linkend="guc-track-io-timing"/> is enabled and + <varname>object</varname> is not <literal>wal</literal>, + or if <xref linkend="guc-track-wal-io-timing"/> is enabled + and <varname>object</varname> is <literal>wal</literal>, + otherwise zero) </para> </entry> </row> @@ -2887,7 +2904,11 @@ description | Waiting for a newly initialized WAL file to reach durable storage </para> <para> Time spent in fsync operations in milliseconds (if - <xref linkend="guc-track-io-timing"/> is enabled, otherwise zero) + <xref linkend="guc-track-io-timing"/> is enabled and + <varname>object</varname> is not <literal>wal</literal>, + or if <xref linkend="guc-track-wal-io-timing"/> is enabled + and <varname>object</varname> is <literal>wal</literal>, + otherwise zero) </para> </entry> </row> |