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| author | Alvaro Herrera <alvherre@alvh.no-ip.org> | 2014-11-28 18:06:18 -0300 |
|---|---|---|
| committer | Alvaro Herrera <alvherre@alvh.no-ip.org> | 2014-11-28 18:06:44 -0300 |
| commit | 866c6ab456f97478ad7b316a8c9fbf7c9e9a3143 (patch) | |
| tree | b41370b78b567f859319cb9d23ef83124ce7a842 | |
| parent | 19b1511a48f2ebdce94fe5f85a89dd6c36da1ba5 (diff) | |
| download | postgresql-866c6ab456f97478ad7b316a8c9fbf7c9e9a3143.tar.gz postgresql-866c6ab456f97478ad7b316a8c9fbf7c9e9a3143.zip | |
Update transaction README for persistent multixacts
Multixacts are now maintained during recovery, but the README didn't get
the memo. Backpatch to 9.3, where the divergence was introduced.
| -rw-r--r-- | src/backend/access/transam/README | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/src/backend/access/transam/README b/src/backend/access/transam/README index f83526ccc36..d86a911afe0 100644 --- a/src/backend/access/transam/README +++ b/src/backend/access/transam/README @@ -817,10 +817,7 @@ parent transaction to complete. Not all transactional behaviour is emulated, for example we do not insert a transaction entry into the lock table, nor do we maintain the transaction -stack in memory. Clog entries are made normally. Multixact is not maintained -because its purpose is to record tuple level locks that an application has -requested to prevent other tuple locks. Since tuple locks cannot be obtained at -all, there is never any conflict and so there is no reason to update multixact. +stack in memory. Clog and multixact entries are made normally. Subtrans is maintained during recovery but the details of the transaction tree are ignored and all subtransactions reference the top-level TransactionId directly. Since commit is atomic this provides correct lock wait behaviour |