What is redo logs in MySQL?
The redo log is a disk-based data structure used during crash recovery to correct data written by incomplete transactions. By default, the redo log is physically represented on disk by two files named ib_logfile0 and ib_logfile1 . MySQL writes to the redo log files in a circular fashion.
What is transaction log in MySQL?
A transaction log backup captures the transaction log that contains a record of all committed or uncommitted transactions. Transaction log backups are consistent with the start time of the backup. Transaction log backups make point-in-time recovery possible.
What is a transactional log in SQL and a redo?
Transaction logs (in MS Sql Server and Sybase) cover functionality that is roughly split into three different items within Oracle’s architecture: You kind of have to do a quick overview of the major architectural differences between MS Sql Server/Sybase and Oracle to explain below.
What’s the difference between binary log and transaction log?
The main difference is that the transaction log is InnoDB-only, the binary log is (mostly) transaction-independent, as it is for all storage engines, transactional or not. MyISAM will write (if enabled) to the binary log. InnoDB will write to the transaction log and the binary log. More info on the manual: REDO log, binary log.
How is the redo log used in other databases?
It is particular confusing for people coming from other databases, because it is used for other things that other databases use the REDO log for: replication and point in time recovery.
What happens when Oracle redo logs fill up?
When Oracle’s redo logs fill up, they (if you are running in archive log mode) dump to an archive log file then eventually over-write themselves, over and over. MS Sql Server’s transaction logs don’ t do that; they write to a defined space and when filled, you have to manually dump tran to clean them out and write them out for recoverability.