Current File : /home/vacivi36/ava/lib/adodb/perf/perf-db2.inc.php
<?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();
// Simple guide to configuring db2: so-so http://www.devx.com/gethelpon/10MinuteSolution/16575
// SELECT * FROM TABLE(SNAPSHOT_APPL('SAMPLE', -1)) as t
class perf_db2 extends adodb_perf{
var $createTableSQL = "CREATE TABLE adodb_logsql (
created TIMESTAMP NOT NULL,
sql0 varchar(250) NOT NULL,
sql1 varchar(4000) NOT NULL,
params varchar(3000) NOT NULL,
tracer varchar(500) NOT NULL,
timer decimal(16,6) NOT NULL
)";
var $settings = array(
'Ratios',
'data cache hit ratio' => array('RATIO',
"SELECT
case when sum(POOL_DATA_L_READS+POOL_INDEX_L_READS)=0 then 0
else 100*(1-sum(POOL_DATA_P_READS+POOL_INDEX_P_READS)/sum(POOL_DATA_L_READS+POOL_INDEX_L_READS)) end
FROM TABLE(SNAPSHOT_APPL('',-2)) as t",
'=WarnCacheRatio'),
'Data Cache',
'data cache buffers' => array('DATAC',
'select sum(npages) from SYSCAT.BUFFERPOOLS',
'See <a href=http://www7b.boulder.ibm.com/dmdd/library/techarticle/anshum/0107anshum.html#bufferpoolsize>tuning reference</a>.' ),
'cache blocksize' => array('DATAC',
'select avg(pagesize) from SYSCAT.BUFFERPOOLS',
'' ),
'data cache size' => array('DATAC',
'select sum(npages*pagesize) from SYSCAT.BUFFERPOOLS',
'' ),
'Connections',
'current connections' => array('SESS',
"SELECT count(*) FROM TABLE(SNAPSHOT_APPL_INFO('',-2)) as t",
''),
false
);
function __construct(&$conn)
{
$this->conn = $conn;
}
function Explain($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;
}
}
}
$qno = rand();
$ok = $this->conn->Execute("EXPLAIN PLAN SET QUERYNO=$qno FOR $sql");
ob_start();
if (!$ok) echo "<p>Have EXPLAIN tables been created?</p>";
else {
$rs = $this->conn->Execute("select * from explain_statement where queryno=$qno");
if ($rs) rs2html($rs);
}
$s = ob_get_contents();
ob_end_clean();
$this->conn->LogSQL($save);
$s .= $this->Tracer($sql);
return $s;
}
/**
* Gets a list of tables
*
* @param int $throwaway discarded variable to match the parent method
* @return string The formatted table list
*/
function Tables($throwaway=0)
{
$rs = $this->conn->Execute("select tabschema,tabname,card as rows,
npages pages_used,fpages pages_allocated, tbspace tablespace
from syscat.tables where tabschema not in ('SYSCAT','SYSIBM','SYSSTAT') order by 1,2");
return rs2html($rs,false,false,false,false);
}
}
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