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################################################################################ # # This test contains a single transaction performing queries against the test # data. The main purpose is to test REPEATABLE READ results, that is to verify # that reads (SELECTs) are indeed repeatable during a REPEATABLE READ # transaction. # # Generally, queries which should yield the same results at one moment in time # should also yield the same results later in the same transaction. In some # configurations, however, phantom reads are allowed (may e.g. depend on # settings such as falcon_consistent_read). # # To detect missing rows, modified rows and possibly invalid (uncommitted) # extra (phantom) rows, we store query results in temporary tables and compare # using special queries. Using includes for this to avoid unnecessary "clutter" # in each select-only test. # # This and similar tests (transactions) should contain some random "filler" # between the SELECTs so that they may run in different conditions, such as: # * some other transactions may have commited in the meantime # * a scavenge run may have happened (falcon) # * etc # # Such a "random filler" can be: # * SLEEP() # * Bogus updates on some unrelated temporary table that was created for the purpose # * savepoint + bogus updates on the main tables + rollback to savepoint # * Inserts on new records (which will show up as "phantom" records in subsequent SELECTs) # ################################################################################ SET autocommit = 0; START TRANSACTION; # We do a full table scan in this test. # Note: May cause deadlocks! (handled in sourced scripts). let $query= SELECT * from t1; --source suite/engines/rr_trx/include/record_query_all_columns.inc SELECT SLEEP(1); let $query= SELECT * from t1; --source suite/engines/rr_trx/include/record_query_all_columns.inc --source suite/engines/rr_trx/include/check_repeatable_read_all_columns.inc COMMIT;