row0purge.h File Reference

#include "univ.i"
#include "data0data.h"
#include "btr0types.h"
#include "btr0pcur.h"
#include "dict0types.h"
#include "trx0types.h"
#include "que0types.h"
#include "row0types.h"
#include "row0purge.h"
#include "ut0vec.h"
#include "row0purge.ic"

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Classes
struct	purge_node_t

Functions
UNIV_INTERN purge_node_t *	row_purge_node_create (que_thr_t *parent, mem_heap_t *heap) __attribute__((nonnull
UNIV_INTERN bool	row_purge_poss_sec (purge_node_t *node, dict_index_t *index, const dtuple_t *entry) __attribute__((nonnull
UNIV_INTERN que_thr_t *	row_purge_step (que_thr_t *thr) __attribute__((nonnull

Variables
UNIV_INTERN purge_node_t	warn_unused_result

Detailed Description

Purge obsolete records

Created 3/14/1997 Heikki Tuuri

Definition in file row0purge.h.

Function Documentation

UNIV_INTERN purge_node_t* row_purge_node_create	(	que_thr_t *	parent,
		mem_heap_t *	heap
	)

Creates a purge node to a query graph.

Returns

own: purge node

Parameters

parent	in: parent node, i.e., a thr node
heap	in: memory heap where created

UNIV_INTERN bool row_purge_poss_sec	(	purge_node_t *	node,
		dict_index_t *	index,
		const dtuple_t *	entry
	)

Determines if it is possible to remove a secondary index entry. Removal is possible if the secondary index entry does not refer to any not delete marked version of a clustered index record where DB_TRX_ID is newer than the purge view.

NOTE: This function should only be called by the purge thread, only while holding a latch on the leaf page of the secondary index entry (or keeping the buffer pool watch on the page). It is possible that this function first returns true and then false, if a user transaction inserts a record that the secondary index entry would refer to. However, in that case, the user transaction would also re-insert the secondary index entry after purge has removed it and released the leaf page latch.

Returns

true if the secondary index record can be purged

Parameters

node	in/out: row purge node
index	in: secondary index
entry	in: secondary index entry

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UNIV_INTERN que_thr_t* row_purge_step

(

que_thr_t *

thr

)

Parameters

thr	in: query thread

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