#include "univ.i"
#include "trx0types.h"
#include "trx0sys.h"
#include "ut0bh.h"
#include "trx0rseg.ic"

Include dependency graph for trx0rseg.h:

Data Structures
struct	trx_rseg_t
struct	rseg_queue_t

Macros
#define	TRX_RSEG_N_SLOTS (UNIV_PAGE_SIZE / 16)
#define	TRX_RSEG_MAX_N_TRXS (TRX_RSEG_N_SLOTS / 2)
#define	TRX_RSEG_SLOT_PAGE_NO
#define	TRX_RSEG_SLOT_SIZE 4
#define	TRX_RSEG FSEG_PAGE_DATA
#define	TRX_RSEG_MAX_SIZE
#define	TRX_RSEG_HISTORY_SIZE
#define	TRX_RSEG_HISTORY
#define	TRX_RSEG_FSEG_HEADER (8 + FLST_BASE_NODE_SIZE)
#define	TRX_RSEG_UNDO_SLOTS (8 + FLST_BASE_NODE_SIZE + FSEG_HEADER_SIZE)

Functions
UNIV_INLINE trx_rsegf_t *	trx_rsegf_get (ulint space, ulint zip_size, ulint page_no, mtr_t *mtr)
UNIV_INLINE trx_rsegf_t *	trx_rsegf_get_new (ulint space, ulint zip_size, ulint page_no, mtr_t *mtr)
UNIV_INLINE ulint	trx_rsegf_get_nth_undo (trx_rsegf_t rsegf, ulint n, mtr_t mtr)
UNIV_INLINE void	trx_rsegf_set_nth_undo (trx_rsegf_t rsegf, ulint n, ulint page_no, mtr_t mtr)
UNIV_INLINE ulint	trx_rsegf_undo_find_free (trx_rsegf_t rsegf, mtr_t mtr)
UNIV_INLINE trx_rseg_t *	trx_rseg_get_on_id (ulint id)
UNIV_INTERN ulint	trx_rseg_header_create (ulint space, ulint zip_size, ulint max_size, ulint rseg_slot_no, mtr_t *mtr)
UNIV_INTERN void	trx_rseg_array_init (trx_sysf_t sys_header, ib_bh_t ib_bh, mtr_t *mtr)
UNIV_INTERN void	trx_rseg_mem_free (trx_rseg_t *rseg)
UNIV_INTERN trx_rseg_t *	trx_rseg_create (ulint space)
UNIV_INTERN ulint	trx_rseg_get_n_undo_tablespaces (ulint *space_ids)

Detailed Description

Rollback segment

Created 3/26/1996 Heikki Tuuri

Macro Definition Documentation

#define TRX_RSEG_HISTORY

Value:

8 /* The update undo logs for committed

transactions */

#define TRX_RSEG_HISTORY_SIZE

Value:

4 /* Number of file pages occupied

by the logs in the history list */

#define TRX_RSEG_MAX_SIZE

Value:

0 /* Maximum allowed size for rollback

segment in pages */

#define TRX_RSEG_SLOT_PAGE_NO

Value:

0 /* Page number of the header page of

an undo log segment */

Function Documentation

UNIV_INTERN void trx_rseg_array_init	(	trx_sysf_t *	sys_header,
		ib_bh_t *	ib_bh,
		mtr_t *	mtr
	)

Creates the memory copies for rollback segments and initializes the rseg array in trx_sys at a database startup. in/out: mtr

Parameters

sys_header	in/out: trx system header
ib_bh	in: rseg queue

UNIV_INTERN trx_rseg_t* trx_rseg_create ( ulint space )

in: id of UNDO tablespace

UNIV_INTERN ulint trx_rseg_get_n_undo_tablespaces ( ulint * space_ids )

out: array of space ids of UNDO tablespaces

UNIV_INLINE trx_rseg_t* trx_rseg_get_on_id ( ulint id )

Looks for a rollback segment, based on the rollback segment id.

Returns: rollback segment in: rollback segment id

Looks for a rollback segment, based on the rollback segment id.

Returns: rollback segment

Parameters

id	in: rollback segment id

UNIV_INTERN ulint trx_rseg_header_create	(	ulint	space,
		ulint	zip_size,
		ulint	max_size,
		ulint	rseg_slot_no,
		mtr_t *	mtr
	)

Creates a rollback segment header. This function is called only when a new rollback segment is created in the database.

Returns: page number of the created segment, FIL_NULL if fail in: mtr

Parameters

space	in: space id
zip_size	in: compressed page size in bytes or 0 for uncompressed pages
max_size	in: max size in pages
rseg_slot_no	in: rseg id == slot number in trx sys

UNIV_INTERN void trx_rseg_mem_free ( trx_rseg_t * rseg )

in, own: instance to free

UNIV_INLINE trx_rsegf_t* trx_rsegf_get	(	ulint	space,
		ulint	zip_size,
		ulint	page_no,
		mtr_t *	mtr
	)

Gets a rollback segment header.

Returns: rollback segment header, page x-latched in: mtr

Gets a rollback segment header.

Returns: rollback segment header, page x-latched

Parameters

space	in: space where placed
zip_size	in: compressed page size in bytes or 0 for uncompressed pages
page_no	in: page number of the header
mtr	in: mtr

UNIV_INLINE trx_rsegf_t* trx_rsegf_get_new	(	ulint	space,
		ulint	zip_size,
		ulint	page_no,
		mtr_t *	mtr
	)

Gets a newly created rollback segment header.

Returns: rollback segment header, page x-latched in: mtr

Gets a newly created rollback segment header.

Returns: rollback segment header, page x-latched

Parameters

space	in: space where placed
zip_size	in: compressed page size in bytes or 0 for uncompressed pages
page_no	in: page number of the header
mtr	in: mtr

UNIV_INLINE ulint trx_rsegf_get_nth_undo	(	trx_rsegf_t *	rsegf,
		ulint	n,
		mtr_t *	mtr
	)

Gets the file page number of the nth undo log slot.

Returns: page number of the undo log segment in: mtr

Gets the file page number of the nth undo log slot.

Returns: page number of the undo log segment

Parameters

rsegf	in: rollback segment header
n	in: index of slot
mtr	in: mtr

UNIV_INLINE void trx_rsegf_set_nth_undo	(	trx_rsegf_t *	rsegf,
		ulint	n,
		ulint	page_no,
		mtr_t *	mtr
	)

Sets the file page number of the nth undo log slot. in: mtr

Sets the file page number of the nth undo log slot.

Parameters

rsegf	in: rollback segment header
n	in: index of slot
page_no	in: page number of the undo log segment
mtr	in: mtr

UNIV_INLINE ulint trx_rsegf_undo_find_free	(	trx_rsegf_t *	rsegf,
		mtr_t *	mtr
	)

Looks for a free slot for an undo log segment.

Returns: slot index or ULINT_UNDEFINED if not found in: mtr

Looks for a free slot for an undo log segment.

Returns: slot index or ULINT_UNDEFINED if not found

Parameters

rsegf	in: rollback segment header
mtr	in: mtr

Data Structures

Macros

Functions

Detailed Description

Macro Definition Documentation

Function Documentation