Detect high-contention DB queries via profiling calls. More...

Inheritance diagram for Wikimedia\Rdbms\TransactionProfiler:

Collaboration diagram for Wikimedia\Rdbms\TransactionProfiler:

Public Member Functions
	__construct ()

	recordConnection ( $server, $db, bool $isPrimary)
	Mark a DB as having been connected to with a new handle.

	recordQueryCompletion ( $query, float $sTime, bool $isWrite, ?int $rowCount, string $trxId, ?string $serverName=null)
	Register the name and time of a method for slow DB trx detection.

	redefineExpectations (array $expects, string $fname)
	Clear all expectations and hit counters and set new performance expectations.

	resetExpectations ()
	Reset all performance expectations and hit counters.

	setExpectation (string $event, $limit, string $fname)
	Set performance expectations.

	setExpectations (array $expects, string $fname)
	Set one or multiple performance expectations.

	setLogger (LoggerInterface $logger)

	setSilenced (bool $value)

	silenceForScope ()
	Disable the logging of warnings until the returned object goes out of scope or is consumed.

	transactionWritingIn ( $server, $db, string $id)
	Mark a DB as in a transaction with one or more writes pending.

	transactionWritingOut ( $server, $db, string $id, float $writeTime, int $affected)
	Mark a DB as no longer in a transaction.

Detailed Description

Detect high-contention DB queries via profiling calls.

This class is meant to work with an IDatabase object, which manages queries.

Access: internal: For use by Database only

Since: 1.24

Definition at line 38 of file TransactionProfiler.php.

Constructor & Destructor Documentation

◆ __construct()

Wikimedia\Rdbms\TransactionProfiler::__construct ( )

Definition at line 91 of file TransactionProfiler.php.

References Wikimedia\Rdbms\TransactionProfiler\setLogger().

Member Function Documentation

◆ recordConnection()

Wikimedia\Rdbms\TransactionProfiler::recordConnection	(		$server,
			$db,
		bool	$isPrimary )

Mark a DB as having been connected to with a new handle.

Note that there can be multiple connections to a single DB.

Parameters

string	$server	DB server
string \| null	$db	DB name
bool	$isPrimary

Definition at line 207 of file TransactionProfiler.php.

◆ recordQueryCompletion()

Wikimedia\Rdbms\TransactionProfiler::recordQueryCompletion	(		$query,
		float	$sTime,
		bool	$isWrite,
		?int	$rowCount,
		string	$trxId,
		?string	$serverName = null )

Register the name and time of a method for slow DB trx detection.

This assumes that all queries are synchronous (non-overlapping)

Parameters

string \| GeneralizedSql	$query	Function name or generalized SQL
float	$sTime	Starting UNIX wall time
bool	$isWrite	Whether this is a write query
int \| null	$rowCount	Number of affected/read rows
string	$trxId	Transaction id
string \| null	$serverName	db host name like db1234

Definition at line 265 of file TransactionProfiler.php.

◆ redefineExpectations()

Wikimedia\Rdbms\TransactionProfiler::redefineExpectations	(	array	$expects,
		string	$fname )

Clear all expectations and hit counters and set new performance expectations.

Use this to apply a totally different set of expectations for a different part of the request, such as during "post-send" (execution after HTTP response completion)

Parameters

array	$expects	Map of (event => limit)
string	$fname

Since: 1.33

Definition at line 193 of file TransactionProfiler.php.

References Wikimedia\Rdbms\TransactionProfiler\setExpectations().

◆ resetExpectations()

Wikimedia\Rdbms\TransactionProfiler::resetExpectations ( )

Reset all performance expectations and hit counters.

Use this for unit testing or before applying a totally different set of expectations for a different part of the request, such as during "post-send" (execution after HTTP response completion)

Since: 1.25

Definition at line 179 of file TransactionProfiler.php.

◆ setExpectation()

Wikimedia\Rdbms\TransactionProfiler::setExpectation	(	string	$event,
			$limit,
		string	$fname )

Set performance expectations.

With conflicting expectations, the most narrow ones will be used

Parameters

string	$event	One of the names in TransactionProfiler::EVENT_NAMES
float \| int	$limit	Maximum event count, event value, or total event value
string	$fname	Caller

Since: 1.25

Definition at line 139 of file TransactionProfiler.php.

Referenced by Wikimedia\Rdbms\TransactionProfiler\setExpectations().

◆ setExpectations()

Wikimedia\Rdbms\TransactionProfiler::setExpectations	(	array	$expects,
		string	$fname )

Set one or multiple performance expectations.

With conflicting expectations, the most narrow ones will be used

Use this to initialize expectations or make them stricter mid-request

Parameters

array	$expects	Map of (event => limit)
string	$fname

Since: 1.26

Definition at line 164 of file TransactionProfiler.php.

References Wikimedia\Rdbms\TransactionProfiler\setExpectation().

Referenced by Wikimedia\Rdbms\TransactionProfiler\redefineExpectations().

◆ setLogger()

Wikimedia\Rdbms\TransactionProfiler::setLogger ( LoggerInterface $logger )

Definition at line 102 of file TransactionProfiler.php.

Referenced by Wikimedia\Rdbms\TransactionProfiler\__construct().

◆ setSilenced()

Wikimedia\Rdbms\TransactionProfiler::setSilenced ( bool $value )

Parameters

bool $value

Returns: bool Old value

Since: 1.28

Definition at line 111 of file TransactionProfiler.php.

Referenced by Wikimedia\Rdbms\TransactionProfiler\silenceForScope().

◆ silenceForScope()

Wikimedia\Rdbms\TransactionProfiler::silenceForScope ( )

Disable the logging of warnings until the returned object goes out of scope or is consumed.

Returns: ScopedCallback

Definition at line 122 of file TransactionProfiler.php.

References Wikimedia\Rdbms\TransactionProfiler\setSilenced().

◆ transactionWritingIn()

Wikimedia\Rdbms\TransactionProfiler::transactionWritingIn	(		$server,
			$db,
		string	$id )

Mark a DB as in a transaction with one or more writes pending.

Note that there can be multiple connections to a single DB.

Parameters

string	$server	DB server
string \| null	$db	DB name
string	$id	ID string of transaction

Definition at line 236 of file TransactionProfiler.php.

◆ transactionWritingOut()

Wikimedia\Rdbms\TransactionProfiler::transactionWritingOut	(		$server,
			$db,
		string	$id,
		float	$writeTime,
		int	$affected )

Mark a DB as no longer in a transaction.

This will check if locks are possibly held for longer than needed and log any affected transactions to a special DB log. Note that there can be multiple connections to a single DB.

Parameters

string	$server	DB server
string \| null	$db	DB name
string	$id	ID string of transaction
float	$writeTime	Time spent in write queries
int	$affected	Number of rows affected by writes

Definition at line 339 of file TransactionProfiler.php.

The documentation for this class was generated from the following file:

includes/libs/rdbms/TransactionProfiler.php

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

◆ __construct()

Member Function Documentation

◆ recordConnection()

◆ recordQueryCompletion()

◆ redefineExpectations()

◆ resetExpectations()

◆ setExpectation()

◆ setExpectations()

◆ setLogger()

◆ setSilenced()

◆ silenceForScope()

◆ transactionWritingIn()

◆ transactionWritingOut()