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

From: Hemant K Chitale <hkchital_at_singnet.com.sg>
Date: Tue, 23 Aug 2005 23:56:12 +0800
Message-Id: <6.2.1.2.0.20050823234625.01f89900@pop.singnet.com.sg>

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:

• CREATE TABLE and ALTER TABLE: for logging of the table, one of its partitions, a LOB segment, or the overflow segment of an index-organized table (see CREATE TABLE and ALTER TABLE).
• CREATE INDEX and ALTER INDEX: for logging of the index or one of its partitions (see CREATE INDEX and ALTER INDEX).
• CREATE MATERIALIZED VIEW and ALTER MATERIALIZED VIEW: for logging of the materialized view, one of its partitions, or a LOB segment (see CREATE MATERIALIZED VIEW and ALTER MATERIALIZED VIEW).
• CREATE MATERIALIZED VIEW LOG and ALTER MATERIALIZED VIEW LOG: for logging of the materialized view log or one of its partitions (see CREATE MATERIALIZED VIEW LOG and ALTER MATERIALIZED VIEW LOG.)
• CREATE TABLESPACE and ALTER TABLESPACE: to set or modify the default logging characteristics for all objects created in the tablespace (see CREATE TABLESPACE and ALTER TABLESPACE.)

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

-- http://www.freelists.org/webpage/oracle-l Received on Tue Aug 23 2005 - 10:58:34 CDT