TC_LOG Class Reference

#include <log.h>

Inheritance diagram for TC_LOG:

List of all members.

Public Types
enum	enum_result { RESULT_SUCCESS, RESULT_ABORTED, RESULT_INCONSISTENT }
Public Member Functions
int	using_heuristic_recover ()
virtual int	open (const char *opt_name)=0
virtual void	close ()=0
virtual enum_result	commit (THD *thd, bool all)=0
virtual int	rollback (THD *thd, bool all)=0
virtual int	prepare (THD *thd, bool all)=0

---

Detailed Description

Transaction Coordinator Log.

A base abstract class for three different implementations of the transaction coordinator.

The server uses the transaction coordinator to order transactions correctly and there are three different implementations: one using an in-memory structure, one dummy that does not do anything, and one using the binary log for transaction coordination.

---

Member Function Documentation

virtual enum_result TC_LOG::commit	(	THD *	thd,
		bool	all
	)		[pure virtual]

Log a commit record of the transaction to the transaction coordinator log.

When the function returns, the transaction commit is properly logged to the transaction coordinator log and can be committed in the storage engines.

Parameters:

thd	Session to log transaction for.
all	True if this is a "real" commit, false if it is a "statement" commit.

Returns:

Error code on failure, zero on success.

Implemented in MYSQL_BIN_LOG, and TC_LOG_DUMMY.

virtual int TC_LOG::prepare	(	THD *	thd,
		bool	all
	)		[pure virtual]

Log a prepare record of the transaction to the storage engines.

Parameters:

thd	Session to log transaction record for.
all	true if an explicit commit or an implicit commit for a statement, false if an internal commit of the statement.

Returns:

Error code on failure, zero on success.

Implemented in MYSQL_BIN_LOG, and TC_LOG_DUMMY.

virtual int TC_LOG::rollback	(	THD *	thd,
		bool	all
	)		[pure virtual]

Log a rollback record of the transaction to the transaction coordinator log.

When the function returns, the transaction have been aborted in the transaction coordinator log.

Parameters:

thd	Session to log transaction record for.
all	true if an explicit commit or an implicit commit for a statement, false if an internal commit of the statement.

Returns:

Error code on failure, zero on success.

Implemented in MYSQL_BIN_LOG, and TC_LOG_DUMMY.

int TC_LOG::using_heuristic_recover

(

)

Perform heuristic recovery, if --tc-heuristic-recover was used.

Note:

no matter whether heuristic recovery was successful or not mysqld must exit. So, return value is the same in both cases.

Return values:

0	no heuristic recovery was requested
1	heuristic recovery was performed

---

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

• log.h
• log.cc