PGXC_DEADLOCK¶
PGXC_DEADLOCK displays lock wait information generated due to distributed deadlocks.
Currently, PGXC_DEADLOCK collects only lock wait 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. |
waitusername | Name | Name of the user who waits for the lock |
waitgxid | Xid | ID of the transaction that waits for the lock |
waitxactstart | Timestamp with time zone | Start time of the transaction that waits for the lock |
waitqueryid | Bigint | Latest query ID of the thread that waits for the lock |
waitquery | Text | Latest query statement of the thread that waits for the lock |
waitpid | Bigint | ID of the thread that waits for the lock |
waitmode | Text | Mode of the waited lock |
holdusername | Name | Name of the user who holds the lock |
holdgxid | Xid | ID of the transaction that holds the lock |
holdxactstart | Timestamp with time zone | Start time of the transaction that holds the lock |
holdqueryid | Bigint | Latest query ID of the thread that holds the lock |
holdquery | Text | Latest query statement of the thread that holds the lock |
holdpid | Bigint | ID of the thread that holds the lock |
holdmode | Text | Mode of the held lock |
waittime | Timestamp with time zone | Timestamp when the lock wait starts. This column is available only in clusters of version 9.1.0.200 or later. |
holdtime | Timestamp with time zone | Timestamp when the lock starts to be held. This column is available only in clusters of version 9.1.0.200 or later. |