So, do you think problem is within the database or is it possible that problem can be somewhere else too (network,hardware etc etc) ..
That TN applies to Windows only.
I have searched Google for this error seen in the bottom of server.log:
*** ERROR *** Assertion failed: 102300 (22.214.171.12400) File associated with given page id is invalid or not open
I found this TN that is not exactly the same, but nevertheless similar enough to assume data corruption: https://www.veritas.com/support/en_US/article.000017748
Another search found the exact error in a Sybase forum where the error definely points to corruption: http://nntp-archive.sybase.com/nntp-archive/action/article/%3C3B9D3340.B20562F5@medinotes.com%3E
Please believe me when I say that you need help.
If your management is really in the process of renewing your software, then your Veritas account manager can approach Support to assist you as a once-off favour.
Thank you all for you guidance and support . Really appreciate it . We are in process of renewing the software . Hopefully we will get some support for this issue.