This
statistical system table contains information on the lock list usageLOCKLISTSTATISTICS
DESCRIPTION |
CHAR ( 40) |
Description of how to interpret the content of the VALUE column (see Column DESCRIPTION table) |
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 in which at least two transactions collided due to existing or requested locks with the result that this collision could only be solved by terminating a transaction implicitly. |
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 |