#include "data0type.h"
#include "page0page.h"

Include dependency graph for trx0undo.ic:

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Functions
UNIV_INLINE roll_ptr_t	trx_undo_build_roll_ptr (ibool is_insert, ulint rseg_id, ulint page_no, ulint offset)
UNIV_INLINE void	trx_undo_decode_roll_ptr (roll_ptr_t roll_ptr, ibool is_insert, ulint rseg_id, ulint page_no, ulint offset)
UNIV_INLINE ibool	trx_undo_roll_ptr_is_insert (roll_ptr_t roll_ptr)
UNIV_INLINE bool	trx_undo_trx_id_is_insert (const byte *trx_id)
UNIV_INLINE void	trx_write_roll_ptr (byte *ptr, roll_ptr_t roll_ptr)
UNIV_INLINE roll_ptr_t	trx_read_roll_ptr (const byte *ptr)
UNIV_INLINE page_t *	trx_undo_page_get (ulint space, ulint zip_size, ulint page_no, mtr_t *mtr)
UNIV_INLINE page_t *	trx_undo_page_get_s_latched (ulint space, ulint zip_size, ulint page_no, mtr_t *mtr)
UNIV_INLINE ulint	trx_undo_page_get_start (page_t *undo_page, ulint page_no, ulint offset)
UNIV_INLINE ulint	trx_undo_page_get_end (page_t *undo_page, ulint page_no, ulint offset)
UNIV_INLINE trx_undo_rec_t *	trx_undo_page_get_prev_rec (trx_undo_rec_t *rec, ulint page_no, ulint offset)
UNIV_INLINE trx_undo_rec_t *	trx_undo_page_get_next_rec (trx_undo_rec_t *rec, ulint page_no, ulint offset)
UNIV_INLINE trx_undo_rec_t *	trx_undo_page_get_last_rec (page_t *undo_page, ulint page_no, ulint offset)
UNIV_INLINE trx_undo_rec_t *	trx_undo_page_get_first_rec (page_t *undo_page, ulint page_no, ulint offset)

Detailed Description

Transaction undo log

Created 3/26/1996 Heikki Tuuri

Function Documentation

UNIV_INLINE roll_ptr_t trx_read_roll_ptr ( const byte * ptr )

Reads a roll ptr from an index page. In case that the roll ptr size changes in some future version, this function should be used instead of mach_read_...

Returns: roll ptr

Parameters

ptr	in: pointer to memory from where to read

UNIV_INLINE roll_ptr_t trx_undo_build_roll_ptr	(	ibool	is_insert,
		ulint	rseg_id,
		ulint	page_no,
		ulint	offset
	)

Builds a roll pointer.

Returns: roll pointer

Parameters

is_insert	in: TRUE if insert undo log
rseg_id	in: rollback segment id
page_no	in: page number
offset	in: offset of the undo entry within page

UNIV_INLINE void trx_undo_decode_roll_ptr	(	roll_ptr_t	roll_ptr,
		ibool *	is_insert,
		ulint *	rseg_id,
		ulint *	page_no,
		ulint *	offset
	)

Decodes a roll pointer.

Parameters

roll_ptr	in: roll pointer
is_insert	out: TRUE if insert undo log
rseg_id	out: rollback segment id
page_no	out: page number
offset	out: offset of the undo entry within page

UNIV_INLINE page_t* trx_undo_page_get	(	ulint	space,
		ulint	zip_size,
		ulint	page_no,
		mtr_t *	mtr
	)

Gets an undo log page and x-latches it.

Returns: pointer to 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
mtr	in: mtr

UNIV_INLINE ulint trx_undo_page_get_end	(	page_t *	undo_page,
		ulint	page_no,
		ulint	offset
	)

Returns the end offset of the undo log records of the specified undo log on the page.

Returns: end offset

Parameters

undo_page	in: undo log page
page_no	in: undo log header page number
offset	in: undo log header offset on page

UNIV_INLINE trx_undo_rec_t* trx_undo_page_get_first_rec	(	page_t *	undo_page,
		ulint	page_no,
		ulint	offset
	)

Returns the first undo record on the page in the specified undo log, or NULL if none exists.

Returns: pointer to record, NULL if none

Parameters

undo_page	in: undo log page
page_no	in: undo log header page number
offset	in: undo log header offset on page

UNIV_INLINE trx_undo_rec_t* trx_undo_page_get_last_rec	(	page_t *	undo_page,
		ulint	page_no,
		ulint	offset
	)

Returns the last undo record on the page in the specified undo log, or NULL if none exists.

Returns: pointer to record, NULL if none

Parameters

undo_page	in: undo log page
page_no	in: undo log header page number
offset	in: undo log header offset on page

UNIV_INLINE trx_undo_rec_t* trx_undo_page_get_next_rec	(	trx_undo_rec_t *	rec,
		ulint	page_no,
		ulint	offset
	)

Returns the next undo log record on the page in the specified log, or NULL if none exists.

Returns: pointer to record, NULL if none

Parameters

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

UNIV_INLINE trx_undo_rec_t* trx_undo_page_get_prev_rec	(	trx_undo_rec_t *	rec,
		ulint	page_no,
		ulint	offset
	)

Returns the previous undo record on the page in the specified log, or NULL if none exists.

Returns: pointer to record, NULL if none

Parameters

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

UNIV_INLINE page_t* trx_undo_page_get_s_latched	(	ulint	space,
		ulint	zip_size,
		ulint	page_no,
		mtr_t *	mtr
	)

Gets an undo log page and s-latches it.

Returns: pointer to page s-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
mtr	in: mtr

UNIV_INLINE ulint trx_undo_page_get_start	(	page_t *	undo_page,
		ulint	page_no,
		ulint	offset
	)

Returns the start offset of the undo log records of the specified undo log on the page.

Returns: start offset

Parameters

undo_page	in: undo log page
page_no	in: undo log header page number
offset	in: undo log header offset on page

UNIV_INLINE ibool trx_undo_roll_ptr_is_insert ( roll_ptr_t roll_ptr )

Returns TRUE if the roll pointer is of the insert type.

Returns: TRUE if insert undo log

Parameters

roll_ptr in: roll pointer

UNIV_INLINE bool trx_undo_trx_id_is_insert ( const byte * trx_id )

Returns true if the record is of the insert type.

Returns: true if the record was freshly inserted (not updated).

Parameters

trx_id in: DB_TRX_ID, followed by DB_ROLL_PTR

UNIV_INLINE void trx_write_roll_ptr	(	byte *	ptr,
		roll_ptr_t	roll_ptr
	)

Writes a roll ptr to an index page. In case that the size changes in some future version, this function should be used instead of mach_write_...

Parameters

ptr	in: pointer to memory where written
roll_ptr	in: roll ptr

Functions

Detailed Description

Function Documentation