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Add the capability to display summary statistics to pg_xlogdump.

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The new --stats/--stats=record options to pg_xlogdump display per
rmgr/per record statistics about the parsed WAL. This is useful to
understand what the WAL primarily consists of, to allow targeted
optimizations on application, configuration, and core code level.

It is likely that we will want to fine tune the statistics further,
but the feature already is quite helpful.

Author: Abhijit Menon-Sen, slightly editorialized by me
Reviewed-By: Andres Freund, Dilip Kumar and Furuya Osamu
Discussion: 20140604104716.GA3989@toroid.org
This commit is contained in:
Andres Freund
2014-09-19 16:33:16 +02:00
parent 728f152e07
commit bdd5726c34
2 changed files with 237 additions and 12 deletions
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12
doc/src/sgml/pg_xlogdump.sgml
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@ -179,6 +179,18 @@ PostgreSQL documentation
</listitem>
</varlistentry>
<varlistentry>
<term><option>-z</option></term>
<term><option>--stats[=record]</option></term>
<listitem>
<para>
Display summary statistics (number and size of records and
full-page images) instead of individual records. Optionally
generate statistics per-record instead of per-rmgr.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-?</></term>
<term><option>--help</></term>