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From Suresh Thalamati <suresh.thalamati.suresh.thalam...@gmail.com>
Subject [PATCH] upgrade fix related to checksum support for transaction log to recognize out of order log writes during recovery (Derby-96)
Date Wed, 20 Apr 2005 18:19:59 GMT
Attached is a second patch towards implementing checksum support for 
transaction
log to handle out of order incomplete log writes during recovery.  This 
patch addresses
upgrade issues related to the new checksum log record.

Testing : Ran derbyall test suite, all tests passed.

Full upgrade : No issues,  Only a new  checksum log record is added , 
there were no changes to existing disk structures.
Soft Upgrade :    If  the  New checksum log recods are wriiten in 10.1  
to checksum transaction log on softupgrade from 10.0,
users can not revert back to 10.0 because 10.0 engine can not read 
checksum recods on recovery and it will fail. ; Attached
 patch addresses this problem by disabling log checksum feature on a 
softupgrade from 10.0 to 10.1.  Transaction log checksum
feature will be enabled only on full upgrade to 10.1 or on a new databases.



Thanks
-suresh




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