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PostgreSQL locks

Field Internal name Type Warning Critical Info
AccessShareLock accesssharelock gauge Used by read only queries
RowShareLock rowsharelock gauge Used by SELECT FOR SHARE and SELECT FOR UPDATE queries
RowExclusiveLock rowexclusivelock gauge Used by UPDATE, DELETE and INSERT queries
ShareUpdateExclusiveLock shareupdateexclusivelock gauge Used by VACUUM, ANALYZE and CREATE INDEX CONCURRENTLY queries
ShareLock sharelock gauge Used by CREATE INDEX queries
ShareRowExclusiveLock sharerowexclusivelock gauge Only issued explicitly from applications
ExclusiveLock exclusivelock gauge Infrequently issued on system tables, or by applications
AccessExclusiveLock accessexclusivelock gauge Used by ALTER TABLE, DROP TABLE, TRUNCATE, REINDEX, CLUSTER and VACUUM FULL queries
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