Answer Posted / sreddy1987
When Database terminated abnormally and when we restart the instance System Monitor(SMON) performs "crash recovery". While doing the crash recovery SMON rollbacks all the transactions which are not committed and roll forwards the committed transactions and invokes the db writer to write the data into database.
When user performs sorting, if sorting takes place in temporary table space that will be cleaned by SMON once the user activity done.
The adjacent free extents join into one single large extent.
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