Vertica Analytics Platform Version 10.1.x Documentation

LOCK_USAGE

Provides aggregate information about lock requests, releases, and attempts, such as wait time/count and hold time/count. Vertica records:

  • Lock attempts at the end of the locking process
  • Lock releases after lock attempts are released
Column Name Data Type Description
NODE_NAME

VARCHAR

Name of the node that is reporting the requested information on which lock interaction occurs.

SESSION_ID

VARCHAR

Identifier for this session. This identifier is unique within the cluster at any point in time but can be reused when the session closes.

OBJECT_NAME

VARCHAR

Name of object being locked; can be a table or an internal structure (projection, global catalog, or local catalog).

MODE

VARCHAR

Intended operations of the transaction. Otherwise, this value is NONE. For a list of lock modes and compatibility, see Lock Modes.

AVG_HOLD_TIME

INTERVAL

Average time (measured in intervals) that Vertica holds a lock.

MAX_HOLD_TIME

INTERVAL

Maximum time (measured in intervals) that Vertica holds a lock.

HOLD_COUNT

INTEGER

Total number of times the lock was granted in the given mode.

AVG_WAIT_TIME

INTERVAL

Average time (measured in intervals) that Vertica waits on the lock.

MAX_WAIT_TIME

INTERVAL

Maximum time (measured in intervals) that Vertica waits on a lock.

WAIT_COUNT

INTEGER

Total number of times lock was unavailable at the time it was first requested.

Privileges

Non-superuser: No explicit privileges required. You only see records for tables that you have privileges to view.