Tuesday, September 8, 2009

ARIES: A Transaction Recovery Method Supporting Fine-Granularity Locking and Partial Rollbacks Using Write-ahead Logging

ARIES: A Transaction Recovery Method Supporting Fine-Granularity Locking and Partial Rollbacks Using Write-ahead Logging
ARIES attempts to better address the problem of guaranteeing atomicity and durability of transactions despite concurrent executions of multiple transactions and various failures. ARIES uses a log to record the progress of a transaction and its actions that change recoverable data. The method of logging allows partial or total rollbacks of transactions during both normal and restart processing. A lot of issues were discussed such as latches and locks, fine-granularity locking, and buffer management. The paper goes over the data structures used by ARIES, how ARIES processes transactions, restart processing, and recovery.
There are 3 phases in the Aries recovery algorithm:
-Analysis: Scan the log forward from the most recent checkpoint to identify all Xacts that were active, and all dirty pages in the buffer pool at the time of the crash.
-Redo: Redoes all updates to dirty pages in the buffer pool to ensure that all logged updates are carried out and written to disk.
-Undo: Working backwards in the log, the writes of all Xacts that were active at the crash are undone by restoring the before value of the update.
A crash occurring during the recovery process is also handled.
This paper discussed a detailed system for providing atomicity while still allowing us to have multiple transactions at once and recover from inevitable failures.

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