PGXC_LOCK_CONFLICTS¶
PGXC_LOCK_CONFLICTS displays information about conflicting locks in the cluster.
When a lock is waiting for another lock or another lock is waiting for this one, a lock conflict occurs.
Currently, PGXC_LOCK_CONFLICTS collects only information about locks whose locktype is relation, partition, page, tuple, or transactionid.
Column | Type | Description |
|---|---|---|
locktype | Text | Type of the locked object |
nodename | Name | Name of the node where the locked object resides |
dbname | Name | Name of the database where the locked object resides. The value is NULL if the locked object is a transaction. |
nspname | Name | Name of the namespace of the locked object |
relname | Name | Name of the relation targeted by the lock. The value is NULL if the object is not a relation or part of a relation. |
partname | Name | Name of the partition targeted by the lock. The value is NULL if the locked object is not a partition. |
page | Integer | Number of the page targeted by the lock. The value is NULL if the locked object is neither a page nor a tuple. |
tuple | Smallint | Number of the tuple targeted by the lock. The value is NULL if the locked object is not a tuple. |
transactionid | Xid | ID of the transaction targeted by the lock. The value is NULL if the locked object is not a transaction. |
username | Name | Name of the user who applies for the lock |
gxid | Xid | ID of the transaction that applies for the lock |
xactstart | Timestamp with time zone | Start time of the transaction that applies for the lock |
queryid | Bigint | Latest query ID of the thread that applies for the lock |
query | Text | Latest query statement of the thread that applies for the lock |
pid | Bigint | ID of the thread that applies for the lock |
mode | Text | Lock mode |
granted | Boolean |
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