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HA_INNOBASE::UPDATE_ROW, TEMPORARY TABLE, TABLE LOCK". Attempt to update an InnoDB temporary table under LOCK TABLES led to assertion failure in both debug and production builds if this temporary table was explicitly locked for READ. The same scenario works fine for MyISAM temporary tables. The assertion failure was caused by discrepancy between lock that was requested on the rows of temporary table at LOCK TABLES time and by update operation. Since SQL-layer requested a read-lock at LOCK TABLES time InnoDB engine assumed that upcoming statements which are going to be executed under LOCK TABLES will only read table and therefore should acquire only S-lock. An update operation broken this assumption by requesting X-lock. Possible approaches to fixing this problem are: 1) Skip locking of temporary tables as locking doesn't make any sense for connection-local objects. 2) Prohibit changing of temporary table locked by LOCK TABLES ... READ. Unfortunately both of these approaches have drawbacks which make them unviable for stable versions of server. So this patch takes another approach and changes code in such way that LOCK TABLES for a temporary table will always request write lock. In 5.1 version of this patch switch from read lock to write lock is done inside of InnoDBs handler methods as doing it on SQL-layer causes compatibility troubles with FLUSH TABLES WITH READ LOCK.
This directory contains a test suite for the MySQL daemon. To run the currently existing test cases, simply execute ./mysql-test-run in this directory. It will fire up the newly built mysqld and test it. Note that you do not have to have to do "make install", and you could actually have a co-existing MySQL installation. The tests will not conflict with it. All tests must pass. If one or more of them fail on your system, please read the following manual section for instructions on how to report the problem: http://dev.mysql.com/doc/mysql/en/mysql-test-suite.html If you want to use an already running MySQL server for specific tests, use the --extern option to mysql-test-run. Please note that in this mode, the test suite expects you to provide the names of the tests to run. For example, here is the command to run the "alias" and "analyze" tests with an external server: mysql-test-run --extern alias analyze To match your setup, you might also need to provide --socket, --user, and other relevant options. With no test cases named on the command line, mysql-test-run falls back to the normal "non-extern" behavior. The reason for this is that some tests cannot run with an external server. You can create your own test cases. To create a test case, create a new file in the t subdirectory using a text editor. The file should have a .test extension. For example: xemacs t/test_case_name.test In the file, put a set of SQL statements that create some tables, load test data, and run some queries to manipulate it. We would appreciate it if you name your test tables t1, t2, t3 ... (to not conflict too much with existing tables). Your test should begin by dropping the tables you are going to create and end by dropping them again. This ensures that you can run the test over and over again. If you are using mysqltest commands (like result file names) in your test case, you should create the result file as follows: mysql-test-run --record test_case_name or mysqltest --record < t/test_case_name.test If you only have a simple test cases consisting of SQL statements and comments, you can create the test case in one of the following ways: mysql-test-run --record test_case_name mysql test < t/test_case_name.test > r/test_case_name.result mysqltest --record --record-file=r/test_case_name.result < t/test_case_name.test When this is done, take a look at r/test_case_name.result - If the result is incorrect, you have found a bug. In this case, you should edit the test result to the correct results so that we can verify that the bug is corrected in future releases. To submit your test case, put your .test file and .result file(s) into a tar.gz archive, add a README that explains the problem, ftp the archive to ftp://support.mysql.com/pub/mysql/secret/ and send a mail to bugs@lists.mysql.com