#include <trx0purge.h>

Public Attributes
ulint	state
sess_t *	sess
trx_t *	trx
que_t *	query
rw_lock_t	latch
read_view_t *	view
mutex_t	mutex
ulint	n_pages_handled
ulint	handle_limit
trx_id_t	purge_trx_no
undo_no_t	purge_undo_no
ibool	next_stored
trx_rseg_t *	rseg
ulint	page_no
ulint	offset
ulint	hdr_page_no
ulint	hdr_offset
trx_undo_arr_t *	arr
mem_heap_t *	heap

Detailed Description

The control structure used in the purge operation

Definition at line 128 of file trx0purge.h.

Member Data Documentation

trx_undo_arr_t* trx_purge_struct::arr

Array of transaction numbers and undo numbers of the undo records currently under processing in purge

Definition at line 177 of file trx0purge.h.

Referenced by trx_purge_sys_close(), and trx_purge_sys_create().

ulint trx_purge_struct::handle_limit

Target of how many pages to get processed in the current purge

Definition at line 148 of file trx0purge.h.

Referenced by trx_purge(), and trx_purge_fetch_next_rec().

ulint trx_purge_struct::hdr_offset

Header byte offset on the page

Definition at line 175 of file trx0purge.h.

Referenced by trx_purge_sys_print().

ulint trx_purge_struct::hdr_page_no

Header page of the undo log where the next record to purge belongs

Definition at line 173 of file trx0purge.h.

Referenced by trx_purge_sys_print().

mem_heap_t* trx_purge_struct::heap

Temporary storage used during a purge: can be emptied after purge completes

Definition at line 180 of file trx0purge.h.

Referenced by trx_purge(), trx_purge_sys_close(), and trx_purge_sys_create().

rw_lock_t trx_purge_struct::latch

The latch protecting the purge view. A purge operation must acquire an x-latch here for the instant at which it changes the purge view: an undo log operation can prevent this by obtaining an s-latch here.

Definition at line 137 of file trx0purge.h.

Referenced by row_vers_build_for_consistent_read(), row_vers_build_for_semi_consistent_read(), row_vers_impl_x_locked_off_kernel(), row_vers_must_preserve_del_marked(), row_vers_old_has_index_entry(), trx_purge(), trx_purge_sys_close(), trx_purge_sys_create(), trx_purge_update_undo_must_exist(), trx_undo_get_undo_rec(), and trx_undo_prev_version_build().

mutex_t trx_purge_struct::mutex

Mutex protecting the fields below

Definition at line 145 of file trx0purge.h.

Referenced by trx_purge(), trx_purge_fetch_next_rec(), trx_purge_rec_release(), trx_purge_sys_close(), and trx_purge_sys_create().

ulint trx_purge_struct::n_pages_handled

Approximate number of undo log pages processed in purge

Definition at line 146 of file trx0purge.h.

Referenced by trx_purge(), trx_purge_fetch_next_rec(), and trx_purge_sys_create().

ibool trx_purge_struct::next_stored

TRUE if the info of the next record to purge is stored below: if yes, then the transaction number and the undo number of the record are stored in purge_trx_no and purge_undo_no above

Definition at line 160 of file trx0purge.h.

Referenced by trx_purge_fetch_next_rec(), trx_purge_sys_create(), and trx_purge_sys_print().

ulint trx_purge_struct::offset

Page offset for the next undo record to purge, 0 if the dummy record

Definition at line 170 of file trx0purge.h.

Referenced by trx_purge_fetch_next_rec(), and trx_purge_sys_print().

ulint trx_purge_struct::page_no

Page number for the next undo record to purge, page number of the log header, if dummy record

Definition at line 167 of file trx0purge.h.

Referenced by trx_purge_fetch_next_rec(), and trx_purge_sys_print().

trx_id_t trx_purge_struct::purge_trx_no

Purge has advanced past all transactions whose number is less than this