How oracle prevent "partial writing".

MySQL innodb use 'Write' to prevent partial writing.
http://www.mysqlperformanceblog.com/2006/08/04/InnoDB-double-write/

But oracle does not 'Double entry', then, what is the mechanism in oracle to prevent partial writing?

We intend to use the block size 32 k, and the level of file system block size is 8 KB. So if oracle written 32 k, but only the first blocks wrote on the drive before the accident, how to recover the oracle?

Well, I note that PostgreSQL also has the function of flushing pages to its transaction logs, the first time, that they were updated after a checkpoint, so I see that this is a common feature of other databases. (I guess if you were crazy enough to insist on the Oracle having same function, you could just issue an "alter database begin backup ' command and leave it like that!")

All I can say is that the overhead costs of this approach are huge (that's why PostgreSQL makes optional, I suppose), and if you check what you have written on the disk after you wrote it (checksum), writing full page in another location shouldn't really be necessary. DBWR did this. And since DBWR works in the background, the calculation of the checksum should not amount to a significant overhead. You can also ask your server process to do it on every read operation (DB_BLOCK_CHECKING), even if it means more load.

During this time, collections of instance (crash) in Oracle never impose participation DBA (other than to activate the "start" command, I guess!).

But yes, if you never get said "corrupt block detected", the answer is media recovery, recovery for instance no - and Yes, which will involve delivery in DBA and recovering things (or something like dbms_repair running "Workaround"). Keep in mind, however, that it is possible to use RMAN to simple block collections while the rest of the database is in place and work... is not always true that the "recovery media" is a huge, full-on case that is to restore gigabytes of things and sat for hours waiting for the things get fixed.

Tags: Database

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