Method of dynamically adding and removing DB2 active logs

Details Method of dynamically adding and removing DB2 active logs Method of dynamically adding and removing DB2 active logs

1992-10-27

1995-07-04

Black, Thomas G.

Boots, shoes, and leggings

395425, 364DIG2, G06F 742, G06F 1200

Patent

active

054308712

ABSTRACT:
In a novel method of dynamically adding or removing active logs in a DB2 subsystem without the necessity of cycling DB2, a set of control blocks emulating certain DB2 control blocks is constructed. In adding an active log, a call to a DB2 module is made to allocate the new active log data set and create a new LDSD control block for the new active log data set. The NEW and REUSABLE status flags are set in the new LDSD control block, initialization of the new LDSD control block is completed, and the new LDSD control block is added to the LDSD chain off the LMB. The BSDS record(s) and the cached portions of the BSDS information are updated to reflect the addition of the new active log. In removing an active log, the LDSD of the active log is removed from the LDSD chain and an attempt is made to deallocate the active log data set via a call to a DB2 module. If the deallocation attempt is unsuccessful, the active log's LDSD is reinserted in the chain off the LDSD; if the attempt is successful the BSDS and the cached portions of the BSDS are updated to reflect the removal of the active log.

REFERENCES:
patent: 5043866 (1991-08-01), Myre
Mohan, "Aries-RRH: Restricted Repeating of History in the ARIES Transaction Recovery Method", pp. 718-727 1991.
Brian W. Kernighan & Dennis M. Richie, "The C Programming Language", Prentice Hall, 1978, pp. 89-142.
Jay Ranade, Mukesh Sehgal, Phyllis Elkind & Joseph Grossmann, "DB2 Concepts, Programming, and Design", McGraw-Hill, 1991, pp. 3-43, 219-223, 337-338.

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