trx0purge.cc File Reference

#include "trx0purge.h"
#include "fsp0fsp.h"
#include "mach0data.h"
#include "trx0rseg.h"
#include "trx0trx.h"
#include "trx0roll.h"
#include "read0read.h"
#include "fut0fut.h"
#include "que0que.h"
#include "row0purge.h"
#include "row0upd.h"
#include "trx0rec.h"
#include "srv0srv.h"
#include "srv0start.h"
#include "os0thread.h"
#include "srv0mon.h"
#include "mtr0log.h"

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Functions
UNIV_INTERN void	trx_purge_sys_create (ulint n_purge_threads, ib_bh_t *ib_bh)
UNIV_INTERN void	trx_purge_sys_close (void)
UNIV_INTERN void	trx_purge_add_update_undo_to_history (trx_t *trx, page_t *undo_page, mtr_t *mtr)

Variables
UNIV_INTERN ulong	srv_max_purge_lag = 0
UNIV_INTERN ulong	srv_max_purge_lag_delay = 0
UNIV_INTERN trx_purge_t *	purge_sys = NULL
UNIV_INTERN trx_undo_rec_t	trx_purge_dummy_rec
static ulint *	n_pages_handled

Detailed Description

Purge old versions

Created 3/26/1996 Heikki Tuuri

Definition in file trx0purge.cc.

Function Documentation

UNIV_INTERN void trx_purge_add_update_undo_to_history	(	trx_t *	trx,
		page_t *	undo_page,
		mtr_t *	mtr
	)

Adds the update undo log as the first log in the history list. Removes the update undo log segment from the rseg slot if it is too big for reuse.

Parameters

trx	in: transaction
undo_page	in: update undo log header page, x-latched
mtr	in: mtr

Definition at line 201 of file trx0purge.cc.

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UNIV_INTERN void trx_purge_sys_close

(

void

)

Frees the global purge system control structure.

Definition at line 162 of file trx0purge.cc.

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UNIV_INTERN void trx_purge_sys_create	(	ulint	n_purge_threads,
		ib_bh_t *	ib_bh
	)

Creates the global purge system control structure and inits the history mutex.

Parameters

n_purge_threads	in: number of purge threads
ib_bh	in, own: UNDO log min binary heap

Definition at line 112 of file trx0purge.cc.

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Variable Documentation

ulint* n_pages_handled

< out: roll pointer to undo record in/out: number of UNDO log pages handled

Definition at line 922 of file trx0purge.cc.

UNIV_INTERN trx_purge_t* purge_sys = NULL

The global data structure coordinating a purge

Definition at line 56 of file trx0purge.cc.

UNIV_INTERN ulong srv_max_purge_lag = 0

Maximum allowable purge history length. <=0 means 'infinite'.

Definition at line 50 of file trx0purge.cc.

UNIV_INTERN ulong srv_max_purge_lag_delay = 0

Max DML user threads delay in micro-seconds.

Definition at line 53 of file trx0purge.cc.

UNIV_INTERN trx_undo_rec_t trx_purge_dummy_rec

A dummy undo record used as a return value when we have a whole undo log

which needs no purge

Definition at line 60 of file trx0purge.cc.