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------------------------------------------------------------
revno: 2630.13.16
committer: Davi Arnaut <Davi.Arnaut@Sun.COM>
branch nick: WL#4284
timestamp: Sat 2008-07-26 13:38:20 -0300
message:
WL#4284: Transactional DDL locking

SQL statements' effect on transactions.

Currently the MySQL server and its storage engines are not
capable of rolling back operations that define or modify data
structures (also known as DDL statements) or operations that
alter any of the system tables (the mysql database). Allowing
these group of statements to participate in transactions
is unfeasible at this time (since rollback has no effect
whatsoever on them) and goes against the design of our metadata
locking subsystem.

The solution is to issue implicit commits before and after
those statements execution. This effectively confines each of
those statements to its own special transaction and ensures
that metadata locks taken during this special transaction
are not leaked into posterior statements/transactions.
This commit is contained in:
Konstantin Osipov
2009-12-03 18:47:20 +03:00
parent 37edcc7e26
commit 4ae05129dc
12 changed files with 2484 additions and 153 deletions
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8
mysql-test/include/commit.inc
View File

@ -725,15 +725,15 @@ call p_verify_status_increment(4, 4, 4, 4);
alter table t3 add column (b int);
call p_verify_status_increment(2, 0, 2, 0);
alter table t3 rename t4;
call p_verify_status_increment(2, 2, 2, 2);
call p_verify_status_increment(4, 4, 4, 4);
rename table t4 to t3;
call p_verify_status_increment(2, 2, 2, 2);
call p_verify_status_increment(0, 0, 0, 0);
truncate table t3;
call p_verify_status_increment(4, 4, 4, 4);
create view v1 as select * from t2;
call p_verify_status_increment(1, 0, 1, 0);
call p_verify_status_increment(2, 0, 2, 0);
check table t1;
call p_verify_status_increment(3, 0, 3, 0);
call p_verify_status_increment(2, 0, 2, 0);
--echo # Sic: after this bug is fixed, CHECK leaves no pending transaction
commit;
call p_verify_status_increment(0, 0, 0, 0);