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Fix phantom reads (http://bugs.mysql.com/27197) following Heikki's

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patch in the bug followup.

Approved by:	Heikki
This commit is contained in:
vasil 2007-04-20 14:41:06 +00:00
parent b04830936f
commit 9023842b88
1 changed files with 26 additions and 0 deletions
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26
row/row0sel.c
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@ -3619,6 +3619,32 @@ shortcut_fails_too_big_rec:
pcur, 0, &mtr);
pcur->trx_if_known = trx;
rec = btr_pcur_get_rec(pcur);
if (!moves_up
&& !page_rec_is_supremum(rec)
&& set_also_gap_locks
&& !(srv_locks_unsafe_for_binlog
|| trx->isolation_level == TRX_ISO_READ_COMMITTED)
&& prebuilt->select_lock_type != LOCK_NONE) {
/* Try to place a gap lock on the next index record
to prevent phantoms in ORDER BY ... DESC queries */
offsets = rec_get_offsets(page_rec_get_next(rec),
index, offsets,
ULINT_UNDEFINED, &heap);
err = sel_set_rec_lock(page_rec_get_next(rec),
index, offsets,
prebuilt->select_lock_type,
LOCK_GAP, thr);
if (err != DB_SUCCESS) {
goto lock_wait_or_error;
}
}
} else {
if (mode == PAGE_CUR_G) {
btr_pcur_open_at_index_side(