nice, i will include the information about lock innodb tables to your bug request just to help a better explain at mysql docs 2014-09-23 8:50 GMT-03:00 Federico Razzoli <federico_raz@yahoo.it>:
Thank you for your clarification, Elena. Based on this information, I find the MySQL manual confusing, so I have reported a bug:
http://bugs.mysql.com/bug.php?id=74033
Unless it turns out that I'm still missing something, I will also check the kb.
Regards Federico
-------------------------------------------- Mar 23/9/14, Elena Stepanova <elenst@montyprogram.com> ha scritto:
Oggetto: Re: [Maria-discuss] R: transactions and UNLOCK TABLES A: "Federico Razzoli" <federico_raz@yahoo.it>, maria-discuss@lists.launchpad.net Data: Martedì 23 settembre 2014, 11:51
Hi Federico,
On 23.09.2014 12:50, Federico Razzoli wrote:
Let's make the snippet simpler. Only one table, non-transactional, please look at the difference from what docs say and the real behaviour. If one could explain what UNLOCK TABLES exactly does, it would be great.
MariaDB [test]> SELECT @@in_transaction, @@autocommit;
+------------------+--------------+
| @@in_transaction | @@autocommit |
+------------------+--------------+
| 0 | 1 | +------------------+--------------+ 1 row in set (0.00 sec)
MariaDB [test]> CREATE OR REPLACE TABLE t (c INT) ENGINE = MEMORY; Query OK, 0 rows affected (0.12 sec)
MariaDB [test]> LOCK TABLE t WRITE; Query OK, 0 rows affected (0.00 sec)
MariaDB [test]> START TRANSACTION; Query OK, 0 rows affected (0.00 sec)
"Beginning a transaction causes table locks acquired with LOCK TABLES to be released, as though you had executed UNLOCK TABLES."
http://dev.mysql.com/doc/refman/5.5/en/commit.html
MariaDB [test]> INSERT INTO t VALUES (1);
Query OK, 1 row affected (0.01 sec)
MariaDB [test]> UNLOCK TABLES; Query OK, 0 rows affected (0.00 sec)
So, this UNLOCK is not actually doing anything.
Regards, Elena
MariaDB [test]> SELECT
@@in_transaction;
+------------------+
| @@in_transaction | +------------------+ | 1 | +------------------+
1 row in set (0.00 sec)
Regards Federico
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