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POWhat's the unit of buffers_checkpoint in pg_stat_bgwriter table?
 

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  1. POWhat's the unit of buffers_checkpoint in pg_stat_bgwriter table?
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    <p>I'm using postgreSQL-9.1.6 and trying to build monitoring application for postgreSQL server.</p> <p>I'm planning to select PHYSICAL and LOGICAL I/O stat from <code>pg_stat_*</code> information tables.</p> <p>According to <a href="http://www.postgresql.org/docs/9.1/static/monitoring-stats.html" rel="nofollow">MANUAL</a> unit of fields in <code>PG_STAT_DATABASE</code> is <strong>BLOCK</strong> which means size of <strong>8KB</strong>.</p> <pre><code>postgres=# select * from pg_stat_database where datname='postgres'; -[ RECORD 3 ]-+------------------------------ datid | 12780 datname | postgres numbackends | 2 xact_commit | 974 xact_rollback | 57 blks_read | 210769 blks_hit | 18664177 tup_returned | 16074339 tup_fetched | 35121 tup_inserted | 18182015 tup_updated | 572 tup_deleted | 3075 conflicts | 0 </code></pre> <p>I could figure out size of <code>PHYSICAL READ</code> usging <code>blks_read</code> * 8KB. However, there is no comments on the unit of stats in <code>PG_STAT_BGWRITER</code>.</p> <pre><code>postgres=# select * from pg_stat_bgwriter; -[ RECORD 1 ]---------+------------------------------ checkpoints_timed | 276 checkpoints_req | 8 buffers_checkpoint | 94956 buffers_clean | 0 maxwritten_clean | 0 buffers_backend | 82618 buffers_backend_fsync | 0 buffers_alloc | 174760 stats_reset | 2013-07-15 22:27:05.503125+09 </code></pre> <p>How can I calculate the size of <code>PHYSICAL WRITE</code> through the <code>buffers_checkpoint</code>?</p> <p>Any advice wold be very appreciated.</p>
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