Waiting for 9.5 – Reduce lock levels of some trigger DDL and add FKs

On 5th of April, Simon Riggs committed patch:

Reduce lock levels of some trigger DDL and add FKs
 
Reduce lock levels to ShareRowExclusive for the following SQL
 CREATE TRIGGER (but not DROP or ALTER)
 ALTER TABLE ENABLE TRIGGER
 ALTER TABLE DISABLE TRIGGER
 ALTER TABLE … ADD CONSTRAINT FOREIGN KEY
 
Original work by Simon Riggs, extracted and refreshed by Andreas Karlsson
New test cases added by Andreas Karlsson
Reviewed by Noah Misch, Andres Freund, Michael Paquier and Simon Riggs

Continue reading Waiting for 9.5 – Reduce lock levels of some trigger DDL and add FKs

Waiting for 9.4 – Add support for REFRESH MATERIALIZED VIEW CONCURRENTLY.

On 16th of July, Kevin Grittner committed patch:

Add support for REFRESH MATERIALIZED VIEW CONCURRENTLY.
 
This allows reads to continue without any blocking while a REFRESH
runs.  The new data appears atomically as part of transaction
commit.
 
Review questioned the Assert that a matview was not a system
relation.  This will be addressed separately.
 
Reviewed by Hitoshi Harada, Robert Haas, Andres Freund.
Merged after review with security patch f3ab5d4.

Continue reading Waiting for 9.4 – Add support for REFRESH MATERIALIZED VIEW CONCURRENTLY.

Waiting for 9.1 – Transaction level advisory locks

On 18th of February, Itagaki Takahiro committed patch:

Add transaction-level advisory locks.
 
They share the same locking namespace with the existing session-level
advisory locks, but they are automatically released at the end of the
current transaction and cannot be released explicitly via unlock
functions.
 
Marko Tiikkaja, reviewed by me.

Continue reading Waiting for 9.1 – Transaction level advisory locks

Waiting for 9.1 – INVALID FOREIGN KEYS

On 8th of February, Simon Riggs committed patch:

Extend ALTER TABLE TO allow FOREIGN KEYS TO be added WITHOUT initial validation.
FK constraints that are marked NOT VALID may later be VALIDATED, which uses an
ShareUpdateExclusiveLock ON CONSTRAINT TABLE AND RowShareLock ON referenced
TABLE. Significantly reduces LOCK strength AND duration WHEN adding FKs.
NEW state visible FROM psql.
 
Simon Riggs, WITH reviews FROM Marko Tiikkaja AND Robert Haas

Continue reading Waiting for 9.1 – INVALID FOREIGN KEYS

Waiting for 9.1 – Reduced lock levels for ALTER TABLE

On 28th of July, Simon Riggs committed patch which:

Log Message:
-----------
Reduce LOCK levels OF CREATE TRIGGER AND SOME ALTER TABLE, CREATE RULE actions.
Avoid hard-coding lockmode used FOR many altering DDL commands, allowing easier
future changes OF LOCK levels. Implementation OF initial analysis ON DDL
sub-commands, so that many LOCK levels are now at ShareUpdateExclusiveLock OR
ShareRowExclusiveLock, allowing certain DDL NOT TO block reads/writes.
FIRST OF NUMBER OF planned changes IN this area; additional docs required
WHEN FULL project complete.

Continue reading Waiting for 9.1 – Reduced lock levels for ALTER TABLE