array('RATIO',
"select case when count(*)=3 then 'TRUE' else 'FALSE' end from pg_settings where (name='stats_block_level' or name='stats_row_level' or name='stats_start_collector') and setting='on' ",
'Value must be TRUE to enable hit ratio statistics (stats_start_collector,stats_row_level and stats_block_level must be set to true in postgresql.conf)'),
'data cache hit ratio' => array('RATIO',
"select case when blks_hit=0 then 0 else (1-blks_read::float/blks_hit)*100 end from pg_stat_database where datname='\$DATABASE'",
'=WarnCacheRatio'),
'IO',
'data reads' => array('IO',
'select sum(heap_blks_read+toast_blks_read) from pg_statio_user_tables',
),
'data writes' => array('IO',
'select sum(n_tup_ins/4.0+n_tup_upd/8.0+n_tup_del/4.0)/16 from pg_stat_user_tables',
'Count of inserts/updates/deletes * coef'),
'Data Cache',
'data cache buffers' => array('DATAC',
"select setting from pg_settings where name='shared_buffers'",
'Number of cache buffers. Tuning'),
'cache blocksize' => array('DATAC',
'select 8192',
'(estimate)' ),
'data cache size' => array( 'DATAC',
"select setting::integer*8192 from pg_settings where name='shared_buffers'",
'' ),
'operating system cache size' => array( 'DATA',
"select setting::integer*8192 from pg_settings where name='effective_cache_size'",
'(effective cache size)' ),
'Memory Usage',
'sort buffer size' => array('CACHE',
"select setting::integer*1024 from pg_settings where name='sort_mem'",
'Size of sort buffer (per query)' ),
'Connections',
'current connections' => array('SESS',
'select count(*) from pg_stat_activity',
''),
'max connections' => array('SESS',
"select setting from pg_settings where name='max_connections'",
''),
'Parameters',
'rollback buffers' => array('COST',
"select setting from pg_settings where name='wal_buffers'",
'WAL buffers'),
'random page cost' => array('COST',
"select setting from pg_settings where name='random_page_cost'",
'Cost of doing a seek (default=4). See random_page_cost'),
false
);
function perf_postgres(&$conn)
{
$this->conn =& $conn;
}
function Explain($sql)
{
$sql = str_replace('?',"''",$sql);
$save = $this->conn->LogSQL(false);
$s = 'Explain: '.htmlspecialchars($sql).'
';
$rs = $this->conn->Execute('EXPLAIN '.$sql);
$this->conn->LogSQL($save);
$s .= '';
if ($rs)
while (!$rs->EOF) {
$s .= reset($rs->fields)."\n";
$rs->MoveNext();
}
$s .= '';
$s .= $this->Tracer($sql);
return $s;
}
}
?>