<?php
/* 
V4.01 23 Oct 2003  (c) 2000-2003 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. 
  Set tabs to 4 for best viewing.
  
  Latest version is available at http://php.weblogs.com/
  
  Library for basic performance monitoring and tuning 
  
*/

class perf_oci8 extends ADODB_perf{
	
	var $tablesSQL = "select segment_name as \"tablename\", sum(bytes)/1024 as \"size_in_k\",tablespace_name as \"tablespace\",count(*) \"extents\" from sys.user_extents 
	   group by segment_name,tablespace_name";
	 
	var $version;
	var $createTableSQL = "CREATE TABLE adodb_logsql (
		  created date NOT NULL,
		  sql0 varchar(250) NOT NULL,
		  sql1 varchar(4000) NOT NULL,
		  params varchar(4000),
		  tracer varchar(4000),
		  timer decimal(16,6) NOT NULL
		)";
	
	var $settings = array(
	'Ratios',
		'data cache hit ratio' => array('RATIOH',
			"select round((1-(phy.value / (cur.value + con.value)))*100,2) 
			from v\$sysstat cur, v\$sysstat con, v\$sysstat phy
			where cur.name = 'db block gets' and
			      con.name = 'consistent gets' and
			      phy.name = 'physical reads'",
			'=WarnCacheRatio'),
		
		'sql cache hit ratio' => array( 'RATIOH',
			'select round(100*(sum(pins)-sum(reloads))/sum(pins),2)  from v$librarycache',
			'increase <i>shared_pool_size</i> if too ratio low'),
			
		'datadict cache hit ratio' => array('RATIOH',
		"select      
           round((1 - (sum(getmisses) / (sum(gets) +          
   		 sum(getmisses))))*100,2)
		from  v\$rowcache",
		'increase <i>shared_pool_size</i> if too ratio low'),

	'IO',
		'data reads' => array('IO',
		"select value from v\$sysstat where name='physical reads'"),
	
	'data writes' => array('IO',
		"select value from v\$sysstat where name='physical writes'"),
	
	'Data Cache',
		'data cache buffers' => array( 'DATAC',
		"select a.value/b.value  from v\$parameter a, v\$parameter b 
			where a.name = 'db_cache_size' and b.name= 'db_block_size'",
			'Number of cache buffers. Tune <i>db_cache_size</i> if the <i>data cache hit ratio</i> is too low.'),
		'data cache blocksize' => array('DATAC',
			"select value from v\$parameter where name='db_block_size'",
			'' ),			
	'Memory Pools',
		'data cache size' => array('DATAC',
			"select value from v\$parameter where name = 'db_cache_size'",
			'db_cache_size' ),
		'shared pool size' => array('DATAC',
			"select value from v\$parameter where name = 'shared_pool_size'",
			'shared_pool_size, which holds shared cursors, stored procedures and similar shared structs' ),
		'java pool size' => array('DATAJ',
			"select value from v\$parameter where name = 'java_pool_size'",
			'java_pool_size' ),
		'large pool buffer size' => array('CACHE',
			"select value from v\$parameter where name='large_pool_size'",
			'this pool is for large mem allocations (not because it is larger than shared pool), for MTS sessions, parallel queries, io buffers (large_pool_size) ' ),

		'pga buffer size' => array('CACHE',			
			"select value from v\$parameter where name='pga_aggregate_target'",
			'program global area is private memory for sorting, and hash and bitmap merges - since oracle 9i (pga_aggregate_target)' ),

		
		'Connections',
		'current connections' => array('SESS',
			'select count(*) from sys.v_$session where username is not null',
			''),
		'max connections' => array( 'SESS',
			"select value from v\$parameter where name='sessions'",
			''),

	'Memory Utilization',		
		'data cache utilization ratio' => array('RATIOU',
			"select round((1-bytes/sgasize)*100, 2)
			from (select sum(bytes) sgasize from sys.v_\$sgastat) s, sys.v_\$sgastat f
			where name = 'free memory' and pool = 'shared pool'",
		'Percentage of data cache actually in use - too low is bad, too high is worse'),
		
		'shared pool utilization ratio' => array('RATIOU',
		'select round((sga.bytes/p.value)*100,2)
		from v$sgastat sga, v$parameter p
		where sga.name = \'free memory\' and sga.pool = \'shared pool\'
		and p.name = \'shared_pool_size\'',
		'Percentage of shared pool actually used - too low is bad, too high is worse'),
		
		'large pool utilization ratio' => array('RATIOU',
			"select round((1-bytes/sgasize)*100, 2)
			from (select sum(bytes) sgasize from sys.v_\$sgastat) s, sys.v_\$sgastat f
			where name = 'free memory' and pool = 'large pool'",
		'Percentage of large_pool actually in use - too low is bad, too high is worse'),
		'sort buffer size' => array('CACHE',
			"select value from v\$parameter where name='sort_area_size'",
			'sort_area_size (per query), uses memory in pga' ),

		'pga usage at peak' => array('RATIOU',
		'=PGA','Mb utilization at peak transactions (requires Oracle 9i+)'),
	'Transactions',
		'rollback segments' => array('ROLLBACK',
			"select count(*) from sys.v_\$rollstat",
			''),
	
		'peak transactions' => array('ROLLBACK',
			"select max_utilization  tx_hwm
    		from sys.v_\$resource_limit
    		where resource_name = 'transactions'",
			'Taken from high-water-mark'),
		'max transactions' => array('ROLLBACK',
			"select value from v\$parameter where name = 'transactions'",
			'max transactions / rollback segments < 3.5 (or transactions_per_rollback_segment)'),
	'Parameters',	
		'cursor sharing' => array('CURSOR',
			"select value from v\$parameter where name = 'cursor_sharing'",
			'Cursor reuse strategy. Recommended is FORCE (8i+) or SIMILAR (9i+). See <a href=http://www.praetoriate.com/oracle_tips_cursor_sharing.htm>cursor_sharing</a>.'),
			
		'index cache cost' => array('COST',
			"select value from v\$parameter where name = 'optimizer_index_caching'",
			'% of indexed data blocks expected in the cache.
			Recommended is 20-80. Default is 0. See <a href=http://www.dba-oracle.com/oracle_tips_cbo_part1.htm>optimizer_index_caching</a>.'),
		
		'random page cost' => array('COST',
			"select value from v\$parameter where name = 'optimizer_index_cost_adj'",
			'Recommended is 10-50 for TP, and 50 for data warehouses. Default is 100. See <a href=http://www.dba-oracle.com/oracle_tips_cost_adj.htm>optimizer_index_cost_adj</a>. '),		
		
		false
		
	);
	
	
	function perf_oci8(&$conn)
	{
		$savelog = $conn->LogSQL(false);	
		$this->version = $conn->ServerInfo();
		$conn->LogSQL($savelog);	
		$this->conn =& $conn;
	}
	
	
	function PGA()
	{
		if ($this->version['version'] < 9) return 'Oracle 9i or later required';
		
		$rs = $this->conn->Execute("select a.mb,a.targ as pga_size_pct,a.pct from 
	   (select round(pga_target_for_estimate/1024.0/1024.0,0) Mb,
	   	   pga_target_factor targ,estd_pga_cache_hit_percentage pct,rownum as r 
	   	   from v\$pga_target_advice) a left join
	   (select round(pga_target_for_estimate/1024.0/1024.0,0) Mb,
	   	   pga_target_factor targ,estd_pga_cache_hit_percentage pct,rownum as r 
	   	   from v\$pga_target_advice) b on 
	  a.r = b.r+1 where 
  		b.pct < 100");
		if (!$rs) return "Only in 9i or later";
		$rs->Close();
		if ($rs->EOF) return "PGA could be too big";
		
		return reset($rs->fields);
	}
	
	function Explain($sql) 
	{
		$savelog = $this->conn->LogSQL(false);
		$rs =& $this->conn->SelectLimit("select ID FROM PLAN_TABLE");
		if (!$rs) {
			echo "<p><b>Missing PLAN_TABLE</b></p>
<pre>
CREATE TABLE PLAN_TABLE (
  STATEMENT_ID                    VARCHAR2(30),
  TIMESTAMP                       DATE,
  REMARKS                         VARCHAR2(80),
  OPERATION                       VARCHAR2(30),
  OPTIONS                         VARCHAR2(30),
  OBJECT_NODE                     VARCHAR2(128),
  OBJECT_OWNER                    VARCHAR2(30),
  OBJECT_NAME                     VARCHAR2(30),
  OBJECT_INSTANCE                 NUMBER(38),
  OBJECT_TYPE                     VARCHAR2(30),
  OPTIMIZER                       VARCHAR2(255),
  SEARCH_COLUMNS                  NUMBER,
  ID                              NUMBER(38),
  PARENT_ID                       NUMBER(38),
  POSITION                        NUMBER(38),
  COST                            NUMBER(38),
  CARDINALITY                     NUMBER(38),
  BYTES                           NUMBER(38),
  OTHER_TAG                       VARCHAR2(255),
  PARTITION_START                 VARCHAR2(255),
  PARTITION_STOP                  VARCHAR2(255),
  PARTITION_ID                    NUMBER(38),
  OTHER                           LONG,
  DISTRIBUTION                    VARCHAR2(30)
);
</pre>";
			return false;
		}
		
		$rs->Close();
	//	$this->conn->debug=1;
	
		$s = "<p><b>Explain</b>: ".htmlspecialchars($sql)."</p>";	
		
		$this->conn->BeginTrans();
		$id = "ADODB ".microtime();
		$rs =& $this->conn->Execute("EXPLAIN PLAN SET STATEMENT_ID='$id' FOR $sql");
		$m = $this->conn->ErrorMsg();
		if ($m) {
			$this->conn->RollbackTrans();
			$this->conn->LogSQL($savelog);
			$s .= "<p>$m</p>";
			return $s;
		}
		$rs = $this->conn->Execute("
		select 
  '<pre>'||lpad('--', (level-1)*2,'-') || trim(operation) || ' ' || trim(options)||'</pre>'  as Operation, 
  object_name,COST,CARDINALITY,bytes
		FROM plan_table 
START WITH id = 0  and STATEMENT_ID='$id'  
CONNECT BY prior id=parent_id and statement_id='$id'");
		
		$s .= rs2html($rs,false,false,false,false);
		$this->conn->RollbackTrans();
		$this->conn->LogSQL($savelog);
		$s .= $this->Tracer($sql);
		return $s;
	}
	
	
	function CheckMemory()
	{
		if ($this->version['version'] < 9) return 'Oracle 9i or later required';
		
		 $rs =& $this->conn->Execute("
select  a.size_for_estimate as cache_mb_estimate,
	case when a.size_factor=1 then 
   		'&lt;&lt;= current'
	 when a.estd_physical_read_factor-b.estd_physical_read_factor > 0 and a.estd_physical_read_factor<1 then
		'- BETTER - '
	else ' ' end as currsize, 
   a.estd_physical_read_factor-b.estd_physical_read_factor as best_when_0
   from (select size_for_estimate,size_factor,estd_physical_read_factor,rownum  r from v\$conn_cache_advice) a , 
   (select size_for_estimate,size_factor,estd_physical_read_factor,rownum r from v\$conn_cache_advice) b where a.r = b.r-1");
		if (!$rs) return false;
		
		/*
		The v$conn_cache_advice utility show the marginal changes in physical data block reads for different sizes of db_cache_size
		*/
		$s = "<h3>Data Cache Estimate</h3>";
		if ($rs->EOF) {
			$s .= "<p>Cache that is 50% of current size is still too big</p>";
		} else {
			$s .= rs2html($rs,false,false,false,false);
		}
		return $s;
	}
	
	/*
		Generate html for suspicious/expensive sql
	*/
	function tohtml(&$rs,$type)
	{
		$o1 = $rs->FetchField(0);
		$o2 = $rs->FetchField(1);
		$o3 = $rs->FetchField(2);
		if ($rs->EOF) return '<p>None found</p>';
		$check = '';
		$sql = '';
		$s = "\n\n<table border=1 bgcolor=white><tr><td><b>".$o1->name.'</b></td><td><b>'.$o2->name.'</b></td><td><b>'.$o3->name.'</b></td></tr>';
		while (!$rs->EOF) {
			if ($check != $rs->fields[0].'::'.$rs->fields[1]) {
				if ($check) {
					$carr = explode('::',$check);
					$prefix = "<a href=\"?$type=1&sql=".rawurlencode($sql).'&x#explain">';
					$suffix = '</a>';
					if (strlen($prefix)>2000) {
						$prefix = '';
						$suffix = '';
					}
					
					$s .=  "\n<tr><td align=right>".$carr[0].'</td><td align=right>'.$carr[1].'</td><td>'.$prefix.$sql.$suffix.'</td></tr>';
				}
				$sql = $rs->fields[2];
				$check = $rs->fields[0].'::'.$rs->fields[1];			
			} else
				$sql .= $rs->fields[2];
			
			$rs->MoveNext();
		}
		$rs->Close();
		
		$carr = explode('::',$check);
		$prefix = "<a target=".rand()." href=\"?&hidem=1&$type=1&sql=".rawurlencode($sql).'&x#explain">';
		$suffix = '</a>';
		if (strlen($prefix)>2000) {
			$prefix = '';
			$suffix = '';
		}
		$s .=  "\n<tr><td align=right>".$carr[0].'</td><td align=right>'.$carr[1].'</td><td>'.$prefix.$sql.$suffix.'</td></tr>';
					
		return $s."</table>\n\n";
	}
	
	// code thanks to Ixora. 
	// http://www.ixora.com.au/scripts/query_opt.htm
	// requires oracle 8.1.7 or later
	function SuspiciousSQL($numsql=10)
	{
		$sql = "
select
  substr(to_char(s.pct, '99.00'), 2) || '%'  load,
  s.executions  executes,
  p.sql_text
from
  ( 
    select
      address,
      buffer_gets,
      executions,
      pct,
      rank() over (order by buffer_gets desc)  ranking
    from
      ( 
	select
	  address,
	  buffer_gets,
	  executions,
	  100 * ratio_to_report(buffer_gets) over ()  pct
	from
	  sys.v_\$sql
	where
	  command_type != 47 and module != 'T.O.A.D.'
      )
    where
      buffer_gets > 50 * executions
  )  s,
  sys.v_\$sqltext  p
where
  s.ranking <= $numsql and
  p.address = s.address
order by
  1 desc, s.address, p.piece";

  		global $ADODB_CACHE_MODE,$HTTP_GET_VARS;
  		if (isset($HTTP_GET_VARS['expsixora']) && isset($HTTP_GET_VARS['sql'])) {
				echo "<a name=explain></a>".$this->Explain($HTTP_GET_VARS['sql'])."\n";
		}

		if (isset($HTTP_GET_VARS['sql'])) return $this->_SuspiciousSQL();
		
		$save = $ADODB_CACHE_MODE;
		$ADODB_CACHE_MODE = ADODB_FETCH_NUM;
		$savelog = $this->conn->LogSQL(false);
		$rs =& $this->conn->SelectLimit($sql);
		$this->conn->LogSQL($savelog);
		$ADODB_CACHE_MODE = $save;
		if ($rs) {
			$s = "\n<h3>Ixora Suspicious SQL</h3>";
			$s .= $this->tohtml($rs,'expsixora');
		} else 
			$s = '';
		
		if ($s) $s .= '<p>';
		$s .= $this->_SuspiciousSQL();
		return $s;
	}
	
	// code thanks to Ixora. 
	// http://www.ixora.com.au/scripts/query_opt.htm
	// requires oracle 8.1.7 or later
	function ExpensiveSQL($numsql = 10)
	{
		$sql = "
select
  substr(to_char(s.pct, '99.00'), 2) || '%'  load,
  s.executions  executes,
  p.sql_text
from
  ( 
    select
      address,
      disk_reads,
      executions,
      pct,
      rank() over (order by disk_reads desc)  ranking
    from
      (
	select
	  address,
	  disk_reads,
	  executions,
	  100 * ratio_to_report(disk_reads) over ()  pct
	from
	  sys.v_\$sql
	where
	  command_type != 47 and module != 'T.O.A.D.'
      )
    where
      disk_reads > 50 * executions
  )  s,
  sys.v_\$sqltext  p
where
  s.ranking <= $numsql and
  p.address = s.address
order by
  1 desc, s.address, p.piece
";
		global $ADODB_CACHE_MODE,$HTTP_GET_VARS;
  		if (isset($HTTP_GET_VARS['expeixora']) && isset($HTTP_GET_VARS['sql'])) {
				echo "<a name=explain></a>".$this->Explain($HTTP_GET_VARS['sql'])."\n";
		}
		
		if (isset($HTTP_GET_VARS['sql'])) {
			 $var =& $this->_ExpensiveSQL();
			 return $var;
		}
		$save = $ADODB_CACHE_MODE;
		$ADODB_CACHE_MODE = ADODB_FETCH_NUM;
		$savelog = $this->conn->LogSQL(false);
		$rs =& $this->conn->Execute($sql);
		$this->conn->LogSQL($savelog);
		$ADODB_CACHE_MODE = $save;
		if ($rs) {
			$s = "\n<h3>Ixora Expensive SQL</h3>";
			$s .= $this->tohtml($rs,'expeixora');
		} else 
			$s = '';
		
		
		if ($s) $s .= '<p>';
		$s .= $this->_ExpensiveSQL();
		return $s;
	}
	
}
?>