Question about the SNA db-link fault

I understand why the RCS is synchronized between the two databases when a DML operation is done via db link, but can someone explain to me why a statement SELECT simple db-link causes the RCS synchronize? This behavior will still be true after the implementation the new patch?

902074 wrote:
I understand why the RCS is synchronized between the two databases when a DML operation is done via db link, but can someone explain to me why a statement SELECT simple db-link causes the RCS synchronize? This behavior will still be true after the implementation the new patch?

It is possible that it is a strategy is intended to keep the code simple.
Remember that the default behavior of a query must be consistent with the SNA read departure for the query and then consider the distirbuted nested loop join where the second (inner) table is at the remote database. For each line of the first source line, the local database runs a query on the remote database - but for the sake of consistency-reading distributed each run this query on the remote database must be consistent in reading with the first run of start SNA. This means that, as a general rule, a distributed query (which could access to a number of remote databases arbtrary and ann arbitrary number of sides on each remote database) will have to remember the SCN of the first time he touched each remote datbase in the query. It is much easier, therefore, to knock the RCS to the remote database to the first contact of the query and then go consistent read at this point.

Concerning
Jonathan Lewis
http://jonathanlewis.WordPress.com
Author: core Oracle

Tags: Database

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