Having Problems / Waits while Rollback

Question

Hi guys/Gurus,
Hope you all doing well.
I am having problem. The database is 9ir2.0.0.8. While doing an heavy transaction(Inserting in around 15 tables, 2000 records each.) The transaction encountered an error at the end before the commit statement. The server took so much time (calculated around 4 hours or more) to rollback the transaction, when i query the wait events table for that particular database session, i found the "LATCH FREE" event, 1500 times waited for "LATCH FREE".
I don't exactly know, what is the reason behind this. would some one please help me in this.
Please reply
thanks

Answer 1

I found this informative two:
What is the most common reason for 'cache buffer chain' latch contention ?
Is it because of some Inappropriate init parameter or because of hotblocks ? which is most common ?
Two main latches protect data blocks in the buffer cache. The cache buffer LRU chain latch must be obtained in order to introduce a new block into the buffer cache, and when writing a buffer back to disk. A cache buffer chains latch is acquired whenever a block in the buffer cache is accessed (pinned). Contention for these latches usually typifies a database that has very high I/O rates. It is possible to reduce contention for the cache buffer LRU chain latch by increasing the size of the buffer cache. This reduces the rate at which new blocks are introduced into the buffer cache. Reducing contention for the cache buffer chains latch usually requires the reduction of logical I/O rates (by tuning and minimizing the I/O requirements of application SQL). You can create additional cache buffer LRU chain latches by adjusting the configuration parameter DB_BLOCK_LRU_LATCHES. You can reduce the load on the cache buffer chain latches by increasing the undocumented configuration parameter DBBLOCK_HASH_BUCKETS.