Oracle Tips by Burleson

Perform a Two-Phase Commit

In this assignment you will get an opportunity to perform a two-phase commit on your two instances (pubs and newpubs).  As we know, Oracle will use the Recoverer process on your PC to ensure that both of our updates will either commit or fail as a single unit.

Remember, only a specific commit between two DML statements will release a two-phase commit.  It is the default behavior of Oracle 10g. Your challenge is as follows:

Create a single script that will perform the following updates as a two-phase commit:

1 – Add 50 to the published quantity for all books.  This will require an update to newpubs.pubs_remote.book_details.publishing_qty.

2 – Update all books to increase the royalty percentage by 1%.  This will update book.book_royalty_pct by one.

Turn in to the instructor by the due date.

The main points of this tutorial include:

* Role-based Oracle security cannot be extended to remote instances.

* Database links may be either public or private.

* Database links do not require a CONNECT TO clause.

* The DBA can choose to implement private database links to manage remote security.

* Some shops encapsulate all SQL into stored procedures and use “grant execute” to manage cross-database security.

* Location transparency can be implemented by using public synonyms.

* Databases on the web use XML as a communications interface.

* Two-phase commit processing is handled automatically by Oracle*Net, but internet-based database require special code to manage concurrent updates.

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