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This commit is contained in:
Bruce Momjian 2020-03-12 15:42:35 -04:00
parent 9b2009c4cf
commit 834b80464d
1 changed files with 6 additions and 3 deletions
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doc/src/sgml/mvcc.sgml
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@ -1039,9 +1039,9 @@ ERROR: could not serialize access due to read/write dependencies among transact
</tip>
<para>
Once acquired, a lock is normally held till end of transaction. But if a
Once acquired, a lock is normally held until the end of the transaction. But if a
lock is acquired after establishing a savepoint, the lock is released
immediately if the savepoint is rolled back to. This is consistent with
immediately if the savepoint is rolled back. This is consistent with
the principle that <command>ROLLBACK</command> cancels all effects of the
commands since the savepoint. The same holds for locks acquired within a
<application>PL/pgSQL</application> exception block: an error escape from the block
@ -1178,7 +1178,10 @@ ERROR: could not serialize access due to read/write dependencies among transact
conflicting locks on the same row, even in different subtransactions;
but other than that, two transactions can never hold conflicting locks
on the same row. Row-level locks do not affect data querying; they
block only <emphasis>writers and lockers</emphasis> to the same row.
block only <emphasis>writers and lockers</emphasis> to the same
row. Row-level locks are released at transaction end or during
savepoint rollback, just like table-level locks.
</para>
<variablelist>