The statistics system table LOCKLISTSTATISTICS contains information about the used space in the lock list.
LOCKLISTSTATISTICS
DESCRIPTION |
CHAR(40) |
Description (see table Column DESCRIPTION) of how to interpret the content of the VALUE column |
VALUE |
CHAR(12) |
Value |
Column DESCRIPTION
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 semaphores for rows |
ENTRIES |
VALUE contains an internal database measure (entries) for the size of the lock list |
USED ENTRIES |
VALUE contains the number of currently used entries for set and requested locks |
USED ENTRIES (%) |
VALUE contains the number of currently used entries for set and requested locks (as a percentage) |
AVG USED ENTRIES |
VALUE contains the average number of entries for set and requested locks |
AVG USED ENTRIES (%) |
VALUE contains the average number of entries for set and requested locks (as a percentage) |
MAX USED ENTRIES |
VALUE contains the maximum number of entries for set and requested locks |
MAX USED ENTRIES(%) |
VALUE contains the maximum number of entries for set and requested locks (as a percentage) |
LOCK ESCALATION VALUE |
VALUE contains the number of table rows from which point row locks are converted into a table lock (lock escalation) |
LOCK ESCALATIONS |
VALUE contains the number of lock escalations |
LOCK COLLISIONS |
VALUE contains the number of lock requests that could not be granted (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 set because they exceeded the maximum waiting time |
TRANSACTIONS HOLDING LOCKS |
VALUE contains the number of transactions that have locks assigned to them |
TRANSACTIONS REQUESTING LOCKS |
VALUE contains the number of transactions that request locks |
CHECKPOINT WANTED |
If the VALUE column contains the value TRUE, the lock list is closed. This means that a transaction that does not yet have an exclusive lock cannot be assigned an exclusive lock because a checkpoint has been requested. |
SHUTDOWN WANTED |
If the VALUE column contains the value TRUE, the lock list is closed because a shutdown has been requested. |