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If you have a kernel with particularly small shared memory and / or semaphore limits , you may have to reconfigure your kernel to increase its shared memory or semaphore parameters . The test script will report any difference as a " failure " , but the difference might be due to small cross-system differences in error message wording , math library behavior , etc. Error messages can come from either the Postgres code or from the host platform system routines . It is possible , to place a qualified rule that rewrites a query to NOTHING if the value of a column does not appear in another table . Examples in this section up to interfacing indices can be found in complex.sql and complex.c . When a transaction runs on this isolation level , a query sees only data committed before the query began and never sees either dirty data or concurrent transaction changes committed during query execution .