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Tom Lane b1f943d2aa Improve contrib/amcheck's tests for CREATE INDEX CONCURRENTLY. ... Commits fdd965d07 and 3cd9c3b92 tested CREATE INDEX CONCURRENTLY by launching two separate pgbench runs concurrently. This was needed so that only a single client thread would run CREATE INDEX CONCURRENTLY, avoiding deadlock between two CICs. However, there's a better way, which is to use an advisory lock to prevent concurrent CICs. That's better in part because the test code is shorter and more readable, but mostly because it automatically scales things to launch an appropriate number of CICs relative to the number of INSERT transactions. As committed, typically half to three-quarters of the CIC transactions were pointless because the INSERT transactions had already stopped. In passing, remove background_pgbench, which was added to support these tests and isn't needed anymore. We can always put it back if we find a use for it later. Back-patch to v12; older pgbench versions lack the conditional-execution features needed for this method. Tom Lane and Andrey Borodin Discussion: https://postgr.es/m/139687.1635277318@sss.pgh.pa.us		4 years ago
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001_verify_heapam.pl	Add more $Test::Builder::Level in the TAP tests	4 years ago
002_cic.pl	Improve contrib/amcheck's tests for CREATE INDEX CONCURRENTLY.	4 years ago
003_cic_2pc.pl	Improve contrib/amcheck's tests for CREATE INDEX CONCURRENTLY.	4 years ago