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docs: log_line_prefix session id fix

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Restore 4-byte designation for docs.  Fix 9.3 doc query to properly pad
to four digits.

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Per suggestions from Ian Lawrence Barwick
This commit is contained in:
Bruce Momjian 2013-05-04 13:15:54 -04:00
parent 75d1406a19
commit f87f214b7c
1 changed files with 3 additions and 3 deletions
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doc/src/sgml/config.sgml
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@ -4089,14 +4089,14 @@ local0.* /var/log/postgresql
</informaltable> </informaltable>
The <literal>%c</> escape prints a quasi-unique session identifier, The <literal>%c</> escape prints a quasi-unique session identifier,
consisting of two hexadecimal numbers separated by a dot. The numbers consisting of two 4-byte hexadecimal numbers separated by a dot.
are the process start time and the The numbers are the process start time and the
process ID, so <literal>%c</> can also be used as a space saving way process ID, so <literal>%c</> can also be used as a space saving way
of printing those items. For example, to generate the session of printing those items. For example, to generate the session
identifier from <literal>pg_stat_activity</>, use this query: identifier from <literal>pg_stat_activity</>, use this query:
<programlisting> <programlisting>
SELECT to_hex(EXTRACT(EPOCH FROM backend_start)::integer) || '.' || SELECT to_hex(EXTRACT(EPOCH FROM backend_start)::integer) || '.' ||
to_hex(pid) regexp_replace('0000' || to_hex(pid), '^0*(.*....)$', '\1')
FROM pg_stat_activity; FROM pg_stat_activity;
</programlisting> </programlisting>