Is there any way to check the status of the Index table.

We installed the 6.3.2 on our system and now the nature of our data
corruption has changed. It used to give us "BTP_CHAIN errors " message
but now it is doing a core dump. I have two questions.

1. Is there a way to check the status of the Index files to see if they
are OK and not corrupted? Since I did not know of anyway to test the
index files, We tried to start the system without reindexing and it
failed, yet after rendering, it works fine for almost a day. The
corruption happens almost after the pick hour everyday.
2. Do you know of a good way to read the Core Dump file? We have FreeBsd
Unix and I have tried to read the file with "gdb -c coredumpfile.core"
command, but it complains about the format of the file. Any clue?