Source for file perf-postgres.inc.php
Documentation is available at perf-postgres.inc.php
V5.04 13 Feb 2008 (c) 2000-2008 John Lim (jlim#natsoft.com.my). All rights reserved.
Released under both BSD license and Lesser GPL library license.
Whenever there is any discrepancy between the two licenses,
the BSD license will take precedence. See License.txt.
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Latest version is available at http://adodb.sourceforge.net
Library for basic performance monitoring and tuning
Notice that PostgreSQL has no sql query cache
"select a.relname as tablename,(a.relpages+CASE WHEN b.relpages is null THEN 0 ELSE b.relpages END+CASE WHEN c.relpages is null THEN 0 ELSE c.relpages END)*8 as size_in_K,a.relfilenode as \"OID\" from pg_class a left join pg_class b
on b.relname = 'pg_toast_'||trim(a.relfilenode)
left join pg_class c on c.relname = 'pg_toast_'||trim(a.relfilenode)||'_index'
where a.relname in (select tablename from pg_tables where tablename not like 'pg_%')";
created timestamp NOT NULL,
sql0 varchar(250) NOT NULL,
timer decimal(16,6) NOT NULL
'statistics collector' =>
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 (<i>stats_start_collector</i>,<i>stats_row_level</i> and <i>stats_block_level</i> must be set to true in postgresql.conf)'),
'data cache hit ratio' =>
array('RATIO',
"select case when blks_hit=0 then 0 else round( ((1-blks_read::float/blks_hit)*100)::numeric, 2) end from pg_stat_database where datname='\$DATABASE'",
'data reads' =>
array('IO',
'select sum(heap_blks_read+toast_blks_read) from pg_statio_user_tables',
'data writes' =>
array('IO',
'select round((sum(n_tup_ins/4.0+n_tup_upd/8.0+n_tup_del/4.0)/16)::numeric,2) from pg_stat_user_tables',
'Count of inserts/updates/deletes * coef'),
'data cache buffers' =>
array('DATAC',
"select setting from pg_settings where name='shared_buffers'",
'Number of cache buffers. <a href=http://www.varlena.com/GeneralBits/Tidbits/perf.html#basic>Tuning</a>'),
'cache blocksize' =>
array('DATAC',
'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)' ),
# Postgres 7.5 changelog: Rename server parameters SortMem and VacuumMem to work_mem and maintenance_work_mem;
'sort/work buffer size' =>
array('CACHE',
"select setting::integer*1024 from pg_settings where name='sort_mem' or name = 'work_mem' order by name",
'Size of sort buffer (per query)' ),
'current connections' =>
array('SESS',
'select count(*) from pg_stat_activity',
'max connections' =>
array('SESS',
"select setting from pg_settings where name='max_connections'",
'rollback buffers' =>
array('COST',
"select setting from pg_settings where name='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 <a href=http://www.varlena.com/GeneralBits/Tidbits/perf.html#less>random_page_cost</a>'),
* @see adodb_perf#optimizeTable
if (! $conn) return false;
ADOConnection::outp(sprintf("<p>%s: '%s' using of undefined mode '%s'</p>", __CLASS__
, 'optimizeTable', $mode));
return $conn->Execute($sql) !==
false;
function Explain($sql,$partial=
false)
$save =
$this->conn->LogSQL(false);
$sqlq =
$this->conn->qstr($sql.
'%');
$arr =
$this->conn->GetArray("select distinct distinct sql1 from adodb_logsql where sql1 like $sqlq");
if (crc32($sql) ==
$partial) break;
$rs =
$this->conn->Execute('EXPLAIN '.
$sql);
$this->conn->LogSQL($save);
$s .=
reset($rs->fields).
"\n";
$s .=
$this->Tracer($sql,$partial);
Documentation generated on Sun, 09 Mar 2008 23:52:51 -0300 by phpDocumentor 1.4.0