Multiples of transaction with a SNA

Hello

a question:
Executing a statement that performs multiple operations, I'll have a SNA with several Transaction ID.

How is it written for the redolog? I find 'sets' with the same SNA and the different Transaction ID?

In the case of recocery the instruction will be "redone" ordered by RCS and within the CNS by Id of the Transaction?

I found no Docs on that one


Concerning
Christian

Rivay Shamsudeen explains the RCS in http://orainternals.wordpress.com/2012/01/19/scn-what-why-and-how/:

YVERT (System change number) is a primary mechanism for maintaining the consistency of the data in the Oracle database. YVERT is used mainly in the following areas, of course, is not an exhaustive list:

  1. Each redo record has a SNA version of do it again in the header to repeat (and recovery records can have non-unique YVERT). Restore records in terms of both threads (as in the case of CARS), recovery will order their order to SNA, essentially maintain a strict sequential order. As explained in my book, each record redo has also several vectors of change.
  2. Each data block has also block YVERT (aka version of block). In addition, a vehicle for change in a redo record also provided block YVERT. This means that a vector of change can be applied to one and only one version of the block. Code checks if the YVERT target in a vector of change correspond with the YVERT block before applying redo record. If there is a gap, corruption errors are thrown.
  3. Coherence of reading also uses of SNA. Each query is request environment that includes a SNA at the beginning of the query. A session can see transactional changes only if the validation of this SNA transaction is less then the environment request YVERT.
  4. Engage. Each commit will generate YVERT, aka commit SCN, which marks a transaction limit. Group validations are also possible.

...

Each change is incremented YVERT?

Not necessarily. Incrementing SNA is not for each change. For example, in the script below, we'll change the table 1000 times, but the generated RCS will be very little.

Tags: Database

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