#include "univ.i"
#include "data0data.h"
#include "btr0types.h"
#include "btr0pcur.h"
#include "dict0types.h"
#include "trx0types.h"
#include "que0types.h"
#include "row0types.h"
Go to the source code of this file.
Classes | |
struct | purge_node_struct |
Functions | |
UNIV_INTERN purge_node_t * | row_purge_node_create (que_thr_t *parent, mem_heap_t *heap) |
UNIV_INTERN ibool | row_purge_poss_sec (purge_node_t *node, dict_index_t *index, const dtuple_t *entry) |
UNIV_INTERN que_thr_t * | row_purge_step (que_thr_t *thr) |
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.
Creates a purge node to a query graph.
parent | in: parent node, i.e., a thr node |
heap | in: memory heap where created |
Definition at line 72 of file row0purge.cc.
References purge_node_struct::common, purge_node_struct::heap, mem_heap_alloc(), mem_heap_create, que_common_struct::parent, que_common_struct::type, and ut_ad.
UNIV_INTERN ibool 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.
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.
node | in/out: row purge node |
index | in: secondary index |
entry | in: secondary index entry |
Definition at line 254 of file row0purge.cc.
References btr_pcur_commit_specify_mtr(), BTR_SEARCH_LEAF, dict_index_is_clust(), mtr_start(), purge_node_struct::pcur, row_vers_old_has_index_entry(), and ut_ad.
Referenced by btr_cur_search_to_nth_level().
in: query thread
Does the purge operation for a single undo log record. This is a high-level function used in an SQL execution graph.
thr | in: query thread |
Definition at line 788 of file row0purge.cc.
References que_node_get_type(), que_thr_struct::run_node, and ut_ad.