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Current redo log files are often referred to as online redo logs to distinguish them from the older saved or archived redo log files.
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CHAPTER 5 ORAC LE DATABA SE 1 1G AR CHITECTURE
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Redo log files consist of redo records, which are groups of change vectors, each referring to a specific change made to a data block in the Oracle database. A single transaction may involve multiple changes to data blocks, so it may have more than one redo record. Initially, the contents of the log are kept in the redo log buffer (a memory area), but they are transferred to disk very quickly. If your database comes down without warning, the redo log can help you determine whether all transactions were committed before the crash or if some were still incomplete. Oracle redo log files contain the following information about database changes made by transactions: Indicators specifying when the transaction started The name of the transaction The name of the data object that was being updated (e.g., an application table) The before image of the transaction (the data as it was before the changes were made) The after image of the transaction (the data as it was after the transaction made the changes) Commit indicators that indicate whether and when the transaction completed When a database crashes, all transactions, both uncommitted as well as committed, have to be applied to the datafiles on disk, using the information in the redo log files. All redo log transactions that have both a begin and a commit entry must be redone, and all transactions that have a begin entry but no commit entry must be undone. (Redoing a transaction in this context simply means that you apply the information in the redo log files to the database; you do not rerun the transaction itself.) Committed transactions are thus re-created by applying the after image records in the redo log files to the database, and incomplete transactions are undone by using the before image records in the undo tablespace. Redo log files are an essential part of database management, and they are one of the main ways you enforce database consistency. Oracle requires that every database have at least two redo log groups, each group consisting of at least one individual log file member. Oracle writes to one redo log file until it gets to the end of the redo log file, at which point it performs a log switch and starts writing to the second log file (and then to the third, if it exists). By default, Oracle will write over the contents of a redo log file, unless you choose to archive your redo files. Oracle recommends that you archive the filled-up redo log files, so you can maintain a complete record of all the changes made to the database since the last backup. If you archive your redo log files, you are said to be running your database in the archivelog mode. Otherwise, you re running in the noarchivelog mode. Because of the critical importance of the redo log files in helping recover from database crashes, Oracle recommends multiplexing (maintaining multiple copies of) the redo log files. Multiplexing the online redo log files by placing two or more copies of the redo logs on different disk drives will ensure that you won t easily lose data changes that haven t been recorded in your datafiles.
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Although an Oracle database consists of datafiles, redo log files, and the control files, the database also requires other files in order to operate. These files include the SPFILE, the password file, the alert log file, as well as various trace file and the backup files. I explain these other files briefly in the following sections.
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