TimesTen 11.2.2.5.0 - backup (.bacxyz) files created by the ttBackup much larger than the data store

Hello

have a question about the files generated by the internal ttBackup utility on our systems.

We have a pair of storage of data replicated with DS following sizes on disk in a two-way manner:

-rw - rw - 1 timesten, timesten 48922624 24 August at 12:45 tt41data.ds0

-rw - rw - 1 timesten, timesten 48922624 24 August at 13:00 tt41data.ds1

-rw - rw - 1 timesten, timesten 38895616 24 August at 12:46 tt41data.ds0

-rw - rw - 1 timesten, timesten 38895616 24 August 12:31 tt41data.ds1

Looking at the backup files generated via /ttBackup - force - dir xxx

You can see on the first:

-rw - 1 timesten, timesten 48922624 24 August at 12:34 tt41data.0.bac

-rw - 1 timesten, timesten 720 24 August at 12:34 tt41data.sta

-rw - 1 timesten, timesten 475060224 24 August at 12:34 tt41data.0.bac245

While on the second:

-rw - 1 timesten, timesten 38895616 24 August at 12:34 tt41data.0.bac

-rw - 1 timesten, timesten 83904512 24 August at 12:34 tt41data.0.bac248

-rw - 1 timesten, timesten 720 24 August at 12:34 tt41data.sta

So while the .bac file is consistent with the size of the DS on the disk, the bacxyz shows a huge difference on the second case.

Undersand it is an internal utility, but I would like to understand the significance of this file, did not find much in the documentation.

Also tried using - type streamFull and the generated files differs for a factor of 4 x.

Check the number of tuples, they are pretty much the same thing, as the ds size seems to imply, but cannot understand the enormous size of the file bac.xxx on the second node, what is the significance of this file?

Thanks in advance!


Mike

The .bac file is essentially a copy of the most recent checkpoint file (ds0/ds1) while the .bacxyz file is a single file that is a fusion of all the files (tt41data.lognnnnnn files) transaction logs needed to recover from this checkpoint file. So depending on the State of your database (in terms of number of log files present on the drive and which of them are actually required) by the time you take the backup of the file .bacxyz can vary in size from very small to very large. If you want to make sure the file .bacxyz has the smallest possible size, you must issue a checkpoint manually, and wait until it finishes before running the ttBackup command.

Chris

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