For various reasons, and in various cases, bloat happens. Theoretically autovacuum protects us all, but sometimes it doesn't. Sometimes someone disables it, or mis-configures, or bad planet alignment happens, and we end up in deep bloat. What to do then? Vacuum? ...

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, ...

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. ...

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 ...