Current File : //proc/self/root/usr/share/mysql-test/suite/engines/rr_trx/t/rr_sc_select-same_2.test
################################################################################
#
# 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;
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