trx0undo.cc File Reference

#include "trx0undo.h"
#include "fsp0fsp.h"
#include "mach0data.h"
#include "mtr0log.h"
#include "trx0rseg.h"
#include "trx0trx.h"
#include "srv0srv.h"
#include "srv0start.h"
#include "trx0rec.h"
#include "trx0purge.h"
#include "srv0mon.h"

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Functions
UNIV_INTERN trx_undo_rec_t *	trx_undo_get_prev_rec (trx_undo_rec_t *rec, ulint page_no, ulint offset, bool shared, mtr_t *mtr)
UNIV_INTERN trx_undo_rec_t *	trx_undo_get_next_rec (trx_undo_rec_t *rec, ulint page_no, ulint offset, mtr_t *mtr)
UNIV_INTERN trx_undo_rec_t *	trx_undo_get_first_rec (ulint space, ulint zip_size, ulint page_no, ulint offset, ulint mode, mtr_t *mtr)
UNIV_INLINE void	trx_undo_page_init_log (page_t *undo_page, ulint type, mtr_t *mtr)
UNIV_INTERN byte *	trx_undo_parse_page_init (byte *ptr, byte *end_ptr, page_t *page, mtr_t *mtr)

Variables
static trx_rsegf_t *	rseg_hdr
static trx_rsegf_t ulint	type
static trx_rsegf_t ulint ulint *	id
static trx_rsegf_t ulint ulint page_t **	undo_page

Detailed Description

Transaction undo log

Created 3/26/1996 Heikki Tuuri

Definition in file trx0undo.cc.

Function Documentation

UNIV_INTERN trx_undo_rec_t* trx_undo_get_first_rec	(	ulint	space,
		ulint	zip_size,
		ulint	page_no,
		ulint	offset,
		ulint	mode,
		mtr_t *	mtr
	)

Gets the first record in an undo log.

Returns

undo log record, the page latched, NULL if none

Parameters

space	in: undo log header space
zip_size	in: compressed page size in bytes or 0 for uncompressed pages
page_no	in: undo log header page number
offset	in: undo log header offset on page
mode	in: latching mode: RW_S_LATCH or RW_X_LATCH
mtr	in: mtr

Definition at line 312 of file trx0undo.cc.

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UNIV_INTERN trx_undo_rec_t* trx_undo_get_next_rec	(	trx_undo_rec_t *	rec,
		ulint	page_no,
		ulint	offset,
		mtr_t *	mtr
	)

Gets the next record in an undo log.

Returns

undo log record, the page s-latched, NULL if none

Parameters

rec	in: undo record
page_no	in: undo log header page number
offset	in: undo log header offset on page
mtr	in: mtr

Definition at line 281 of file trx0undo.cc.

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UNIV_INTERN trx_undo_rec_t* trx_undo_get_prev_rec	(	trx_undo_rec_t *	rec,
		ulint	page_no,
		ulint	offset,
		bool	shared,
		mtr_t *	mtr
	)

Gets the previous record in an undo log.

Returns

undo log record, the page s-latched, NULL if none

Parameters

rec	in: undo record
page_no	in: undo log header page number
offset	in: undo log header offset on page
shared	in: true=S-latch, false=X-latch
mtr	in: mtr

Definition at line 200 of file trx0undo.cc.

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UNIV_INLINE void trx_undo_page_init_log	(	page_t *	undo_page,
		ulint	type,
		mtr_t *	mtr
	)

Writes the mtr log entry of an undo log page initialization.

Parameters

undo_page	in: undo log page
type	in: undo log type
mtr	in: mtr

Definition at line 349 of file trx0undo.cc.

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UNIV_INTERN byte* trx_undo_parse_page_init	(	byte *	ptr,
		byte *	end_ptr,
		page_t *	page,
		mtr_t *	mtr
	)

Parses the redo log entry of an undo log page initialization.

Returns

end of log record or NULL

Parameters

ptr	in: buffer
end_ptr	in: buffer end
page	in: page or NULL
mtr	in: mtr or NULL

Definition at line 368 of file trx0undo.cc.

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Variable Documentation

trx_rsegf_t ulint ulint* id

out: slot index within rseg header

Definition at line 428 of file trx0undo.cc.

trx_rsegf_t* rseg_hdr

< in: rollback segment in: rollback segment header, page x-latched

Definition at line 428 of file trx0undo.cc.

trx_rsegf_t ulint type

in: type of the segment: TRX_UNDO_INSERT or TRX_UNDO_UPDATE

Definition at line 428 of file trx0undo.cc.

trx_rsegf_t ulint ulint page_t** undo_page

out: segment header page x-latched, NULL if there was an error

Definition at line 428 of file trx0undo.cc.