The system table HOTSTANDBYGROUP describes which information the hot standby component (that is, the hot standby component in which the information from this system table is queried) holds about the other standby components.
HOTSTANDBYGROUP
LOCALNODE |
CHAR(64) |
Name with which component can be addressed |
ADDNODEDATE |
TIMESTAMP |
Time at which component was added to hot standby configuration |
REMOVENODEDATE |
TIMESTAMP |
Time at which component was deleted from hot standby configuration |
STATE |
CHAR(20) |
Status of component (UNKNOWN, PREPARE STANDBY, WAIT FOR SYNCHRONIZE, DEACTIVATED, REGISTER STANDBY, REMOVED, ADDED) |
PREPARESTANDBYDATE |
TIMESTAMP |
Time at which component received last PREPARE STANDBY statement |
REGISTERSTANDBYDATE |
TIMESTAMP |
Time at which component received last REGISTER STANDBY statement |
SYNCHRONIZEDATE |
TIMESTAMP |
Time at which component sent last SYNCHRONIZE statement |
SUCCESSFULSYNCHRONIZEDATE |
TIMESTAMP |
Time at which last successful SYNCHRONIZE statement was executed |
LASTVALIDLOGOFFSETSENT |
FIXED(10) |
Last position sent by the master component in log area, up to which log entries can be remade by the standby components |
FIRSTNEEDELOGOFFSET |
FIXED(10) |
Oldest position in log area up to which master component can write without overwriting log pages required by standby components |
SYNCHRONIZESENDCOUNT |
FIXED(10) |
Number of sent SYNCHRONIZE statements |
SYNCHRONIZERETRYCOUNT |
FIXED(10) |
Number of SYNCHRONIZE statements that have failed since last successful SYNCHRONIZE statement |
See also:
Concepts of the Database System, Architecture of a Hot Standby System