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<?php

/**

 * Library for basic performance monitoring and tuning

 *

 * This file is part of ADOdb, a Database Abstraction Layer library for PHP.

 *

 * @package ADOdb

 * @link https://adodb.org Project's web site and documentation

 * @link https://github.com/ADOdb/ADOdb Source code and issue tracker

 *

 * The ADOdb Library is dual-licensed, released under both the BSD 3-Clause

 * and the GNU Lesser General Public Licence (LGPL) v2.1 or, at your option,

 * any later version. This means you can use it in proprietary products.

 * See the LICENSE.md file distributed with this source code for details.

 * @license BSD-3-Clause

 * @license LGPL-2.1-or-later

 *

 * @copyright 2000-2013 John Lim

 * @copyright 2014 Damien Regad, Mark Newnham and the ADOdb community

 */

// security - hide paths

if (!defined('ADODB_DIR')) die();

/*

	Notice that PostgreSQL has no sql query cache

*/

class perf_postgres extends adodb_perf{

	var $tablesSQL =

	"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_%')";

	var $createTableSQL = "CREATE TABLE adodb_logsql (

		  created timestamp NOT NULL,

		  sql0 varchar(250) NOT NULL,

		  sql1 text NOT NULL,

		  params text NOT NULL,

		  tracer text NOT NULL,

		  timer decimal(16,6) NOT NULL

		)";

	var $settings = array(

	'Ratios',

		'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'",

			'=WarnCacheRatio'),

	'IO',

		'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',

		'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',

			'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',

	# 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)' ),

	'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 <a href=http://www.varlena.com/GeneralBits/Tidbits/perf.html#less>random_page_cost</a>'),

		false

	);

	function __construct(&$conn)

	{

		$this->conn = $conn;

	}

	var $optimizeTableLow  = 'VACUUM %s';

	var $optimizeTableHigh = 'VACUUM ANALYZE %s';

/**

 * @see adodb_perf::optimizeTable()

 */

	function optimizeTable($table, $mode = ADODB_OPT_LOW)

	{

	    if(! is_string($table)) return false;

	    $conn = $this->conn;

	    if (! $conn) return false;

	    $sql = '';

	    switch($mode) {

	        case ADODB_OPT_LOW : $sql = $this->optimizeTableLow;  break;

	        case ADODB_OPT_HIGH: $sql = $this->optimizeTableHigh; break;

	        default            :

	            ADOConnection::outp(sprintf("<p>%s: '%s' using of undefined mode '%s'</p>", __CLASS__, 'optimizeTable', $mode));

	            return false;

	    }

	    $sql = sprintf($sql, $table);

	    return $conn->Execute($sql) !== false;

	}

	function Explain($sql,$partial=false)

	{

		$save = $this->conn->LogSQL(false);

		if ($partial) {

			$sqlq = $this->conn->qstr($sql.'%');

			$arr = $this->conn->getArray("select distinct sql1 from adodb_logsql where sql1 like $sqlq");

			if ($arr) {

				foreach($arr as $row) {

					$sql = reset($row);

					if (crc32($sql) == $partial) break;

				}

			}

		}

		$sql = str_replace('?',"''",$sql);

		$s = '<p><b>Explain</b>: '.htmlspecialchars($sql).'</p>';

		$rs = $this->conn->Execute('EXPLAIN '.$sql);

		$this->conn->LogSQL($save);

		$s .= '<pre>';

		if ($rs)

			while (!$rs->EOF) {

				$s .= reset($rs->fields)."\n";

				$rs->MoveNext();

			}

		$s .= '</pre>';

		$s .= $this->Tracer($sql,$partial);

		return $s;

	}

}