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find object wait for running db_file_sequential_read - why?

edited Jan 25, 2017 11:23AM in SQL Performance (MOSC) 6 commentsAnswered

DB: Oracle 11.2.0.4

Non ASM

OS: Linux 5

For an existing-running  DML, Oracle indicates that the current process is waiting for db_file_sequential_read.

In this DML process, the SQL joins on many tables.....the plan shows access to these tables and indexes,

1. how could I find out which index oracle is showing db_file_sequential_read wait?

2. Why Oracle is showing db_file_sequential_read for this index? BTW.. This index is in usable state and stats are good(gathered yesterday) and not stale including table.

3. ran oradebug on spid and the trace file shows the object# 2703160 that translate to a partition on a large table but not an index

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