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Merge sinisa@work.mysql.com:/home/bk/mysql-4.0

Browse source 
into sinisa.nasamreza.org:/mnt/work/mysql-4.0
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unknown 2002-12-03 22:06:48 +02:00
commit 1fd17cce36
1 changed files with 10 additions and 2 deletions
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12
innobase/row/row0sel.c
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@ -2702,14 +2702,22 @@ row_search_for_mysql(
unique_search_from_clust_index = TRUE;
if (prebuilt->select_lock_type == LOCK_NONE
if (trx->mysql_n_tables_locked == 0
&& prebuilt->select_lock_type == LOCK_NONE
&& trx->isolation_level > TRX_ISO_READ_UNCOMMITTED
&& trx->read_view) {
/* This is a SELECT query done as a consistent read,
and the read view has already been allocated:
let us try a search shortcut through the hash
index */
index.
NOTE that we must also test that
mysql_n_tables_locked == 0, because this might
also be INSERT INTO ... SELECT ... or
CREATE TABLE ... SELECT ... . Our algorithm is
NOT prepared to inserts interleaved with the SELECT,
and if we try that, we can deadlock on the adaptive
hash index semaphore! */
if (btr_search_latch.writer != RW_LOCK_NOT_LOCKED) {
/* There is an x-latch request: release