database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-07-30 16:24:05 +03:00
Code Activity

Bug #14007649 65111: INNODB SOMETIMES FAILS TO UPDATE ROWS INSERTED

Browse Source 
BY A CONCURRENT TRANSACTIO

The member function QUICK_RANGE_SELECT::init_ror_merged_scan() performs
a table handler clone. Innodb does not provide a clone operation.  
The ha_innobase::clone() is not there. The handler::clone() does not 
take care of the ha_innobase->prebuilt->select_lock_type.  Because of 
this what happens is that for one index we do a locking read, and 
for the other index we were doing a non-locking (consistent) read. 
The patch introduces ha_innobase::clone() member function.  
It is implemented similar to ha_myisam::clone().  It calls the 
base class handler::clone() and then does any additional operation 
required.  I am setting the ha_innobase->prebuilt->select_lock_type 
correctly. 

rb://1060 approved by Marko
This commit is contained in:
Annamalai Gurusami
2012-05-10 10:18:31 +05:30
parent 074ce71e90
commit 391ea219c2
10 changed files with 283 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

56
mysql-test/suite/innodb/r/innodb_bug14007649.result Normal file
View File

@ -0,0 +1,56 @@
create table t1 (
rowid int,
f1 int,
f2 int,
key i1 (f1, f2),
key i2 (f2)) engine=innodb;
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`rowid` int(11) DEFAULT NULL,
`f1` int(11) DEFAULT NULL,
`f2` int(11) DEFAULT NULL,
KEY `i1` (`f1`,`f2`),
KEY `i2` (`f2`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
insert into `t1` (rowid, f1, f2) values (1, 1, 10), (2, 1, NULL);
start transaction with consistent snapshot;
start transaction;
update t1 set f2 = 4 where f1 = 1 and f2 is null;
(b) Number of rows updated:
select row_count();
row_count()
1
insert into t1 values (3, 1, null);
(b) After update and insert query.
select rowid, f1, f2 from t1;
rowid f1 f2
1 1 10
2 1 4
3 1 NULL
commit;
(a) Before the update statement is executed.
select rowid, f1, f2 from t1;
rowid f1 f2
1 1 10
2 1 NULL
SET SESSION debug="+d,bug14007649";
update t1 set f2 = 6 where f1 = 1 and f2 is null;
(a) Number of rows updated:
select row_count();
row_count()
1
(a) After the update statement is executed.
select rowid, f1, f2 from t1;
rowid f1 f2
1 1 10
2 1 NULL
3 1 6
commit;
"The trx with consistent snapshot ended."
select rowid, f1, f2 from t1;
rowid f1 f2
1 1 10
2 1 4
3 1 6
drop table t1;