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MAINFRAME - TIP OF THE DAY : Q. If there is a situation, where we need to code more than 255 steps in a JOB? A. We need to split jcl into two jcls , at the end of the first jcl check the condition code and initiate the second jcl.

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2 Phase commit

 
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PostPosted: Fri Nov 24, 2006 8:25 pm    Post subject: 2 Phase commit Reply with quote

What is 2 phase commit??
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PostPosted: Sat Nov 25, 2006 4:41 pm    Post subject: Reply with quote

Probably the best definition I have found is in the IBM Redbook:
Systems Programmer?s Guide to Resource Recovery Services (RRS).

Go to IBM Library and look at the redbooks section. sorry, I don't have the link.
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PostPosted: Mon Nov 27, 2006 11:10 am    Post subject: Two-phase commit Reply with quote

Two-phase commit:

Coordinator sends requests to all participants for vote. All commit votes only result in global commit. Any single vote for abort will result in global abort.


Detailed Definition for two-phase commit
---------------------------------------------------


Two-phase commit - DB2


PHASE I.
----------


STEP 1 :

When the database client requests that the unit of work be committed, a prepare message
is sent to all databases participating in the unit of work. Each database writes a "PREPARED"
record to its log files, and replies to the database client.

STEP 2 :

After the database client receives a positive response from all of the databases, it sends a
message to the transaction manager database, informing it that the unit of work is now ready
to be committed (PREPARED). The transaction manager database writes a "PREPARED" record to its
log file, and sends a reply to inform the client that the second phase of the commit process
can be started.



PHASE II
-----------

STEP 3 :

During the second phase of the commit process, the database client sends a message to all
participating databases to tell them to commit. Each database writes a "COMMITTED" record
to its log file, and releases the locks that were held for this unit of work. When the database
has completed committing the changes, it sends a reply to the client.


STEP 4 :

After the database client receives a positive response from all participating databases,
it sends a message to the transaction manager database, informing it that the unit of work
has been completed. The transaction manager database then writes a "COMMITTED" record to its
log file, indicating that the unit of work is complete, and replies to the client, indicating
that it has finished.


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PostPosted: Mon Nov 27, 2006 5:05 pm    Post subject: About Two phase commit Reply with quote

This is maily the concept of updating multiple database.

After the database client receives a positive response from all participating databases, it sends a message to the transaction manager database, informing it that the unit of work has been completed. The transaction manager database then writes a "COMMITTED" record to its log file, indicating that the unit of work is complete, and replies to the client, indicating that it has finished.

Hit or browse the following link to know more in detail with diagram(Good example).

http://publib.boulder.ibm.com/infocenter/db2luw/v8/index.jsp?topic=/com.ibm.db2.udb.doc/admin/c0005032.htm

Venkat
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