## LOCKLISTSTATISTICS

### Definition

The statistics system table LOCKLISTSTATISTICS contains information about the used space in the lock list.

### Structure

LOCKLISTSTATISTICS

DESCRIPTION | CHAR(40) | Description of how to interpret the content of the VALUE column (see table Column DESCRIPTION)
VALUE | CHAR(12) | Value

DESCRIPTION Column

Value | Explanation
MAX LOCKS | VALUE contains the number of available locks in the lock list
TRANS LIST REGIONS | VALUE contains the number of semaphores for transactions
TABLE LIST REGIONS | VALUE contains the number of semaphores for tables
ROW LIST REGIONS | VALUE contains the number of the semaphore for rows
ENTRIES | VALUE contains an internal measure (entries) for the lock list size
USED ENTRIES | VALUE contains the number of entries for locks and lock requests
USED ENTRIES(%) | VALUE contains the percentage of entries used for locks and lock requests
AVG USED ENTRIES | VALUE contains the average number of entries used for locks and lock requests
AVG USED ENTRIES(%) | VALUE contains the average percentage of entries used for locks and lock requests
MAX USED ENTRIES | VALUE contains the maximum number of entries for locks and lock requests
MAX USED ENTRIES(%) | VALUE contains the maximum percentage of entries used for locks and lock requests
LOCK ESCALATION VALUE | VALUE contains the number of table rows from which the lock rows are converted into table locks (lock escalation)
LOCK ESCALATIONS | VALUE contains the number of lock escalations
LOCK COLLISIONS | VALUE contains the number of lock requests that could not be satisfied (immediately)
DEADLOCKS | VALUE contains the number of situations where at least two transactions collided with each other due to held and requested locks in such a way that this collision can be resolved only by implicitly ending a transaction
SQL REQUEST TIMEOUTS | VALUE contains the number of lock requests that could not be satisfied because they had exceeded the maximum wait time
TRANSACTIONS HOLDING LOCKS | VALUE contains the number of transactions with assigned locks
TRANSACTIONS REQUESTING LOCKS | VALUE contains the number of transactions requesting locks
CHECKPOINT WANTED | If the VALUE column contains the value TRUE, the lock list is closed, i.e. no exclusive lock can be assigned to a transaction without exclusive lock because a checkpoint was requested
SHUTDOWN WANTED | If the column VALUE contains the value TRUE, the lock list is closed because a shutdown was requested

See also:

Concepts of the Database System, Locking for Database Objects