avoid sort of imagecopy in recovery scenarios RFE 124061

 

http://www.ibm.com/developerworks/rfe/execute?use_case=viewRfe&CR_ID=124061

We still had the sort work dd statements generated with 9 datasets each and Cyl,(900,900) but still jobs failed in certain cases when using DB2SORT (another pmr exist).                                            

Then these jobs were rerun without DB2SORT and it finished ok. By taking the image copies on partlevel we are just avoiding a design flaw in how RE is dealing with the image copy and applying the logrecs. 

This flaw still needs to be fixed as it is just a matter of time when a  partlevel image copy is also too big.

 

Therefore the next steps would be to fix the design flaw to do the sort/merge of the log records in smaller chucks and to not include the IC into this. <br/>As I mentioned previously in the PMR the steps should be the following for a robust product:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br/><br/>- Write the latest full image copy&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br/>- Add any incremental images copies&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br/>- Getting the log records in small chunks and apply to object&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br/>- continue until target LRSN has been reached&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br/><br/>This will provide for restart capabilities and avoid having to restart from the beginning and wil make the product robust to handle any size objects with object level image copies or partition level image copies.