U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

US Patent Application 20090037494 - CHECKPOINT-FREE IN LOG MINING FOR DISTRIBUTED INFORMATION SHARING

Application 20090037494 Filed on July 31, 2007. Published on February 5, 2009

Inventors

US Class

707/202Recoverability

Attorney, Agent or Firm

International Class

G06F 17/30

Issued Patent Number:

7801852


Abstract text


A checkpoint free log mining mechanism comprising a capture process and an apply process that are logically associated with each other may be provided in a database system. In an embodiment, log mining information published by the capture process to the apply process comprises a complete set of log information for each interesting transaction. A system change number of a start transaction record of a transaction may be used to represent a start time of the entire transaction. The capture and apply processes may work cooperatively to establish a safe time point in the form of a particular system change number in logs to begin mining, under various circumstances such as in an initial startup state, in a steady state, in a process restart scenario in the middle of checkpoint free log mining, or in a transition between the checkpoint mode and the checkpoint free mode.

PatentsPlus Images
Enhanced PDF formats
loading...
PatentsPlus: add to cart
PatentsPlus: add to cartSearch-enhanced full patent PDF image
$9.95more info
 
Sign InRegister
Username  
Password   
forgot password?