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RE: ORA-1578...block corrupted...error is normal...a block...had a NOLOGGING...operation performed against

Allen, Brandon

2005-08-23

Replies:
Hemant,
 
Where in the documentation do you see a description of this different treatment of the NOLOGGING clause for CREATE vs. ALTER statements?
 
My understanding from the documentation, including that which you have included in your email below, is that when specifying NOLOGGING during either the CREATE or ALTER of an object, the creation/alteration of the object as well as any future direct loads/inserts are minimally logged.  If you see something contrary to this in the documentation, please provide a link.
 
Thanks,
Brandon
 
P.S.  in case anyone else tries to look it up - the correct Metalink note # is 147474.1
 
-----Original Message-----
From: Hemant K Chitale [mailto:hkchital@singnet.com.sg]
Sent: Tuesday, August 23, 2005 8:56 AM
To: jkstill@gmail.com; Allen, Brandon
Cc: cmarquez@collegeboard.org; oracle-l@freelists.org
Subject: Re: ORA-1578...block corrupted...error is normal...a block...had a NOLOGGING...operation performed against


Jared,

You ARE right.  You really don't need to retest it. 
When an object is NOLOGGING is used in the CREATE statement, it is the actual first load that the create does
that is NOLOGGING.  All subsequent DML is logged.
When an object is ALTERed to NOLOGGING,  only certain statements (eg APPEND) that support NOLOGGING
are NOLOGGed.
Read the extract that Allen has quoted "Direct Loader .. and direct path insert".  It specifically talks of Direct
operations  NOT regular DML.  Regular DML is always always LOGged.

Again, quoting from the 9i SQL Reference  on the logging clause :  This also says " .. subseqent direct .. direct ..."
NOT regular DML.

=========================================================================

logging_clause


Purpose

The logging_clause lets you specify whether creation of a database object will be logged in the redo log file (LOGGING) or not (NOLOGGING).

This clause also specifies whether subsequent Direct Loader (SQL*Loader) and direct-path INSERT operations against the object are logged (LOGGING) or not logged (NOLOGGING).

You can specify the logging_clause in the following statements:
You can also specify LOGGING or NOLOGGING for the following operations:
  • Rebuilding an index (using CREATE INDEX ... REBUILD)
  • Moving a table (using ALTER TABLE ... MOVE)
=========================================================================

Data Dictionary Updates are always logged.  Regular DML is always logged.

Note 17474.1 , from Oracle7 and Oracle8  days is still the best reference.

   The following operations can make use of no-logging mode:

        direct load (SQL*Loader)
        direct-load INSERT
        CREATE TABLE ... AS SELECT
        CREATE INDEX
        ALTER TABLE ... MOVE PARTITION
        ALTER TABLE ... SPLIT PARTITION
        ALTER INDEX ... SPLIT PARTITION
        ALTER INDEX ... REBUILD
        ALTER INDEX ... REBUILD PARTITION
        INSERT, UPDATE, and DELETE on LOBs in NOCACHE NOLOGGING mode stored out of line



At 11:40 PM Tuesday, Jared Still wrote:
I will rerun my tests and post the results to the list.

If there is a flaw in my testing procedure someone here
is sure to spot it.

Won't be able to do so until this afternoon however.

Jared


Hemant K Chitale
http://web.singnet.com.sg/~hkchital

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