postgresql/src/test/regress/sql/hs_standby_disallowed.sql

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Allow read only connections during recovery, known as Hot Standby. Enabled by recovery_connections = on (default) and forcing archive recovery using a recovery.conf. Recovery processing now emulates the original transactions as they are replayed, providing full locking and MVCC behaviour for read only queries. Recovery must enter consistent state before connections are allowed, so there is a delay, typically short, before connections succeed. Replay of recovering transactions can conflict and in some cases deadlock with queries during recovery; these result in query cancellation after max_standby_delay seconds have expired. Infrastructure changes have minor effects on normal running, though introduce four new types of WAL record. New test mode "make standbycheck" allows regression tests of static command behaviour on a standby server while in recovery. Typical and extreme dynamic behaviours have been checked via code inspection and manual testing. Few port specific behaviours have been utilised, though primary testing has been on Linux only so far. This commit is the basic patch. Additional changes will follow in this release to enhance some aspects of behaviour, notably improved handling of conflicts, deadlock detection and query cancellation. Changes to VACUUM FULL are also required. Simon Riggs, with significant and lengthy review by Heikki Linnakangas, including streamlined redesign of snapshot creation and two-phase commit. Important contributions from Florian Pflug, Mark Kirkwood, Merlin Moncure, Greg Stark, Gianni Ciolli, Gabriele Bartolini, Hannu Krosing, Robert Haas, Tatsuo Ishii, Hiroyuki Yamada plus support and feedback from many other community members.
2009-12-19 02:32:45 +01:00
--
-- Hot Standby tests
--
-- hs_standby_disallowed.sql
--
SET transaction_read_only = off;
begin transaction read write;
commit;
-- SELECT
select * from hs1 FOR SHARE;
select * from hs1 FOR UPDATE;
-- DML
BEGIN;
insert into hs1 values (37);
ROLLBACK;
BEGIN;
delete from hs1 where col1 = 1;
ROLLBACK;
BEGIN;
update hs1 set col1 = NULL where col1 > 0;
ROLLBACK;
BEGIN;
truncate hs3;
ROLLBACK;
-- DDL
create temporary table hstemp1 (col1 integer);
BEGIN;
drop table hs2;
ROLLBACK;
BEGIN;
create table hs4 (col1 integer);
ROLLBACK;
-- Sequences
SELECT nextval('hsseq');
-- Two-phase commit transaction stuff
BEGIN;
SELECT count(*) FROM hs1;
PREPARE TRANSACTION 'foobar';
ROLLBACK;
BEGIN;
SELECT count(*) FROM hs1;
COMMIT PREPARED 'foobar';
ROLLBACK;
BEGIN;
SELECT count(*) FROM hs1;
PREPARE TRANSACTION 'foobar';
ROLLBACK PREPARED 'foobar';
ROLLBACK;
BEGIN;
SELECT count(*) FROM hs1;
ROLLBACK PREPARED 'foobar';
ROLLBACK;
-- Locks
BEGIN;
LOCK hs1;
COMMIT;
BEGIN;
LOCK hs1 IN SHARE UPDATE EXCLUSIVE MODE;
COMMIT;
BEGIN;
LOCK hs1 IN SHARE MODE;
COMMIT;
BEGIN;
LOCK hs1 IN SHARE ROW EXCLUSIVE MODE;
COMMIT;
BEGIN;
LOCK hs1 IN EXCLUSIVE MODE;
COMMIT;
BEGIN;
LOCK hs1 IN ACCESS EXCLUSIVE MODE;
COMMIT;
-- Listen
listen a;
notify a;
unlisten a;
unlisten *;
-- disallowed commands
ANALYZE hs1;
VACUUM hs2;
CLUSTER hs2 using hs1_pkey;
REINDEX TABLE hs2;
REVOKE SELECT ON hs1 FROM PUBLIC;
GRANT SELECT ON hs1 TO PUBLIC;