trx0rseg.h File Reference

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

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Classes
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

Definition in file trx0rseg.h.

Macro Definition Documentation

#define TRX_RSEG_HISTORY

Value:

8       /* The update undo logs for committed
                                        transactions */

Definition at line 214 of file trx0rseg.h.

#define TRX_RSEG_HISTORY_SIZE

Value:

4       /* Number of file pages occupied
                                        by the logs in the history list */

Definition at line 213 of file trx0rseg.h.

#define TRX_RSEG_MAX_SIZE

Value:

0       /* Maximum allowed size for rollback
                                        segment in pages */

Definition at line 212 of file trx0rseg.h.

#define TRX_RSEG_SLOT_PAGE_NO

Value:

0       /* Page number of the header page of
                                        an undo log segment */

Definition at line 202 of file trx0rseg.h.

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

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

Parameters

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

Definition at line 350 of file trx0rseg.cc.

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UNIV_INTERN trx_rseg_t* trx_rseg_create

(

ulint

space

)

in: id of UNDO tablespace

Parameters

space

in: id of UNDO tablespace

Definition at line 301 of file trx0rseg.cc.

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UNIV_INTERN ulint trx_rseg_get_n_undo_tablespaces

(

ulint *

space_ids

)

out: array of space ids of UNDO tablespaces

Parameters

space_ids

out: array of space ids of UNDO tablespaces

Definition at line 369 of file trx0rseg.cc.

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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

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

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

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
mtr	in: mtr

Definition at line 50 of file trx0rseg.cc.

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UNIV_INTERN void trx_rseg_mem_free

(

trx_rseg_t *

rseg

)

in, own: instance to free

Free's an instance of the rollback segment in memory.

Definition at line 115 of file trx0rseg.cc.

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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

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

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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

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

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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

Parameters

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

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

Parameters

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

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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

Parameters

rsegf

in: rollback segment header