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<?php
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/* 
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V4.80 8 Mar 2006  (c) 2000-2006 John Lim (jlim@natsoft.com.my). All rights reserved.
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  Released under both BSD license and Lesser GPL library license. 
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  Whenever there is any discrepancy between the two licenses, 
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  the BSD license will take precedence. See License.txt. 
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  Set tabs to 4 for best viewing.
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  Latest version is available at http://adodb.sourceforge.net
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  Library for basic performance monitoring and tuning 
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*/
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// security - hide paths
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if (!defined('ADODB_DIR')) die();
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/*
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	Notice that PostgreSQL has no sql query cache
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*/
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class perf_postgres extends adodb_perf{
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	var $tablesSQL = 
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	"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
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		on b.relname = 'pg_toast_'||trim(a.relfilenode) 
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		left join pg_class c on c.relname = 'pg_toast_'||trim(a.relfilenode)||'_index'
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		where a.relname in (select tablename from pg_tables where tablename not like 'pg_%')";
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	var $createTableSQL = "CREATE TABLE adodb_logsql (
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		  created timestamp NOT NULL,
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		  sql0 varchar(250) NOT NULL,
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		  sql1 text NOT NULL,
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		  params text NOT NULL,
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		  tracer text NOT NULL,
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		  timer decimal(16,6) NOT NULL
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		)";	
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	var $settings = array(
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	'Ratios',
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		'statistics collector' => array('RATIO',
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			"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' ",
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			'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)'),
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		'data cache hit ratio' => array('RATIO',
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			"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'",
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			'=WarnCacheRatio'),
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	'IO',
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		'data reads' => array('IO',
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		'select sum(heap_blks_read+toast_blks_read) from pg_statio_user_tables',
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		),
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		'data writes' => array('IO',
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		'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',
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		'Count of inserts/updates/deletes * coef'),
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	'Data Cache',
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		'data cache buffers' => array('DATAC',
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			"select setting from pg_settings where name='shared_buffers'",
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			'Number of cache buffers. <a href=http://www.varlena.com/GeneralBits/Tidbits/perf.html#basic>Tuning</a>'),
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		'cache blocksize' => array('DATAC',
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			'select 8192',
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			'(estimate)' ),
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		'data cache size' => array( 'DATAC',
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		"select setting::integer*8192 from pg_settings where name='shared_buffers'",
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			'' ),
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		'operating system cache size' => array( 'DATA',
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		"select setting::integer*8192 from pg_settings where name='effective_cache_size'",
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			'(effective cache size)' ),
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	'Memory Usage',
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	# Postgres 7.5 changelog: Rename server parameters SortMem and VacuumMem to work_mem and maintenance_work_mem;
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		'sort/work buffer size' => array('CACHE',
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			"select setting::integer*1024 from pg_settings where name='sort_mem' or name = 'work_mem' order by name",
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			'Size of sort buffer (per query)' ),
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	'Connections',
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		'current connections' => array('SESS',
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			'select count(*) from pg_stat_activity',
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			''),
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		'max connections' => array('SESS',
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			"select setting from pg_settings where name='max_connections'",
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			''),
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	'Parameters',
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		'rollback buffers' => array('COST',
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			"select setting from pg_settings where name='wal_buffers'",
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			'WAL buffers'),
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		'random page cost' => array('COST',
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			"select setting from pg_settings where name='random_page_cost'",
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			'Cost of doing a seek (default=4). See <a href=http://www.varlena.com/GeneralBits/Tidbits/perf.html#less>random_page_cost</a>'),
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		false
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	);
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	function perf_postgres(&$conn)
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	{
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		$this->conn =& $conn;
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	}
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	function Explain($sql,$partial=false)
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	{
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		$save = $this->conn->LogSQL(false);
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		if ($partial) {
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			$sqlq = $this->conn->qstr($sql.'%');
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			$arr = $this->conn->GetArray("select distinct distinct sql1 from adodb_logsql where sql1 like $sqlq");
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			if ($arr) {
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				foreach($arr as $row) {
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					$sql = reset($row);
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					if (crc32($sql) == $partial) break;
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				}
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			}
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		}
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		$sql = str_replace('?',"''",$sql);
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		$s = '<p><b>Explain</b>: '.htmlspecialchars($sql).'</p>';
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		$rs = $this->conn->Execute('EXPLAIN '.$sql);
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		$this->conn->LogSQL($save);
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		$s .= '<pre>';
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		if ($rs)
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			while (!$rs->EOF) {
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				$s .= reset($rs->fields)."\n";
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				$rs->MoveNext();
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			}
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		$s .= '</pre>';
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		$s .= $this->Tracer($sql,$partial);
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		return $s;
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	}
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}
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?>