Details
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Bug
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Status: Closed (View Workflow)
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Major
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Resolution: Fixed
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10.1.22
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None
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General Linux
Description
The data manipulation statements trigger writes into aria transaction log(s) for the tables created with DEFAULT engine options.
Two side effects: 1) unexpected performance penalty; 2) In combination with MDEV-8587 documented behavior security of the data seriously impaired.
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SQL Client |
MariaDB [dummydb]> create table test5 (x int, y varchar(1024));
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Query OK, 0 rows affected (0.01 sec)
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MariaDB [dummydb]> show create table test5;
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+-------+------------------------------------------------------------------------------------------------------------------------------------------+
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| Table | Create Table |
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+-------+------------------------------------------------------------------------------------------------------------------------------------------+
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| test5 | CREATE TABLE `test5` (
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`x` int(11) DEFAULT NULL,
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`y` varchar(1024) DEFAULT NULL
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) ENGINE=Aria DEFAULT CHARSET=latin1 PAGE_CHECKSUM=1 |
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+-------+------------------------------------------------------------------------------------------------------------------------------------------+
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1 row in set (0.00 sec)
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MariaDB [dummydb]> insert into test5 (x,y) values (1,"THIS IS NOT SUPPOSED TO BE THERE");
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Query OK, 1 row affected (0.00 sec)
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MariaDB [dummydb]> flush tables;
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Query OK, 0 rows affected (0.01 sec)
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console |
dummydb$ tr -cd '\11\12\15\40-\176' < ../aria_log.00000001 | grep "THIS"
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"[tRpS=*mydb/tesJxdt#t./dummydb/test5t2 THIS IS NOT SUPPOSED TO BE THEREtb/test5 Y-xY-x?G@El` \G
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dummydb$ tr -c '\11\12\15\40-\176' '\n' < ../aria_log.00000001 | grep "THIS"
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THIS IS NOT SUPPOSED TO BE THERE
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SQL Client |
MariaDB [dummydb]> alter table test5 transactional=0;
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Query OK, 1 row affected (0.02 sec)
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Records: 1 Duplicates: 0 Warnings: 0
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MariaDB [dummydb]> insert into test5 (x,y) values (2,"NOW IT IS OK");
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Query OK, 1 row affected (0.00 sec)
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MariaDB [dummydb]> flush tables;
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Query OK, 0 rows affected (0.00 sec)
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console |
dummydb$ tr -c '\11\12\15\40-\176' '\n' < ../aria_log.00000001 | grep "NOW"; echo $?
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1
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