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Kirill Smelkov
mariadb
Commits
5783e800
Commit
5783e800
authored
Dec 03, 2002
by
heikki@hundin.mysql.fi
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row0sel.c:
Fix a hang introduced in 4.0.5 in INSERT INTO ... SELECT ... when binlogging is not on
parent
8830eb4a
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innobase/row/row0sel.c
View file @
5783e800
...
@@ -2702,14 +2702,22 @@ row_search_for_mysql(
...
@@ -2702,14 +2702,22 @@ row_search_for_mysql(
unique_search_from_clust_index
=
TRUE
;
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
->
isolation_level
>
TRX_ISO_READ_UNCOMMITTED
&&
trx
->
read_view
)
{
&&
trx
->
read_view
)
{
/* This is a SELECT query done as a consistent read,
/* This is a SELECT query done as a consistent read,
and the read view has already been allocated:
and the read view has already been allocated:
let us try a search shortcut through the hash
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
)
{
if
(
btr_search_latch
.
writer
!=
RW_LOCK_NOT_LOCKED
)
{
/* There is an x-latch request: release
/* There is an x-latch request: release
...
...
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