SET innodb_table_locks=1; SET autocommit=0; SET TRANSACTION ISOLATION LEVEL SERIALIZABLE; BEGIN; INSERT INTO m VALUES (1); INSERT INTO t VALUES (1); SELECT @@in_transaction; <- return 1 UNLOCK TABLES; SELECT @@in_transaction; <- return 1 ------ SET innodb_table_locks=1; SET autocommit=0; SET TRANSACTION ISOLATION LEVEL SERIALIZABLE; BEGIN; SELECT @@in_transaction; <- return 1 lock table m write; SELECT @@in_transaction; <- return 1 INSERT INTO m VALUES (1); INSERT INTO t VALUES (1); /* Erro SQL (1100): Table 't' was not locked with LOCK TABLES */ SELECT @@in_transaction; <- return 1 UNLOCK TABLES; SELECT @@in_transaction; <- return 0 2014-09-22 20:46 GMT-03:00 Roberto Spadim <roberto@spadim.com.br>:
well from kb what i understand is: to use unlock with innodb (the engine you use with both tables), you should SET innodb_table_locks=1; SET autocommit=0; after that any LOCK/UNLOCK with innodb tables inside a transaction will commit the transaction
try again using innodb_table_locks, and autocommit variables
2014-09-22 19:51 GMT-03:00 Federico Razzoli <federico_raz@yahoo.it>:
No, becuase the first test case I've posted shows that the reality is
different... :) I'm just asking to explain the exact interaction between trx and UNLOCK, because I need to know if statements I use are safe.
Federico
-------------------------------------------- Mar 23/9/14, Roberto Spadim <roberto@spadim.com.br> ha scritto:
Oggetto: Re: [Maria-discuss] transactions and UNLOCK TABLES A: "Federico Razzoli" <federico_raz@yahoo.it> Cc: "Maria Discuss" <maria-discuss@lists.launchpad.net>, "maria-docs" < maria-docs@lists.launchpad.net> Data: Martedì 23 settembre 2014, 00:14
better explained at mariadb kbhttps:// mariadb.com/kb/en/mariadb/documentation/sql-commands/transactions/lock-tables-and-unlock-tables/#limitations
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-- Roberto Spadim SPAEmpresarial Eng. Automação e Controle
-- Roberto Spadim SPAEmpresarial Eng. Automação e Controle