January 30, 2024
What types of locks can impact each other:
| | ACCESS SHARE | ROW SHARE | ROW EXCL | SHARE UPDATE EXCL | SHARE | SHARE ROW EXCL | EXCL | ACCESS EXCL | QUERY |
|-------------------|--------------|-----------|----------|-------------------|-------|----------------|------|-------------|------------------------------------------------------|
| ACCESS SHARE | | | | | | | | X | SELECT |
| ROW SHARE | | | | | | | X | X | SELECT FOR UPDATE/SHARE |
| ROW EXCL | | | | | X | X | X | X | INSERT/UPDATE/DELETE |
| SHARE UPDATE EXCL | | | | X | X | X | X | X | VACUUM/CREATE INDEX CONCURRENTLY |
| SHARE | | | X | X | | X | X | X | CREATE INDEX |
| SHARE ROW EXCL | | | X | X | X | X | X | X | CREATE TRIGGER/ADD FOREIGN KEY |
| EXCL | | X | X | X | X | X | X | X | REFRESH MATVIEW CONCURRENTLY |
| ACCESS EXCL | X | X | X | X | X | X | X | X | DROP/TRUNCATE/VACUUM FULL/LOCK TABLE/REFRESH MATVIEW |