Oracle Tablespace Logging (DIY Project Download)

If the object for which you are specifying the logging attributes resides in a database or tablespace in force logging mode, then Oracle Database ignores any NOLOGGING setting until the database or tablespace is taken out of force logging mode. If tablespace is read only, then Oracle Database does not update the datafile headers to reflect the new name. The alert log will indicate that the datafile headers have not been updated. What happens at the tablespace level? If the tablespace has logging enabled (which is the default), then objects created with NOLOGGING afterwards will stay NOLOGGING, but objects created when logging was in effect will stay that way.

oracle tablespace logging 2On the other hand, FORCE LOGGING can be used on tablespace or database level to force logging of changes to the redo. This may be required for sites that are mining log data, using Oracle Streams or using Data Guard (standby databases). It bypasses the writing of the redo log, significantly improving performance. With NOLOGGING, although you can set the NOLOGGING attribute for a table, partition, index, or tablespace, NOLOGGING mode does not apply to every operation performed on the schema object for which you set the NOLOGGING attribute. The only reason to create a tablespace with nologging, or to later set the nologging attribute on a tablespace, is to change the default of all objects (segments) created in that tablespace from that point forward.

Nologging can be overriden at tablespace level using alter tablespace. Oracle introduced the ALTER DATABASE FORCE LOGGING command in Oracle 9i R2. In Oracle Database NOLOGGING option used together with DIRECT mode speeds up transactions executed in a database because it limits information that Oracle writes about such transactions into redo l. DBF’ SIZE 100m; and table TEST_TBL with LOGGING option in the tablespace. Dbf’ SIZE 500M logging autoextend off extent management local;. — Undo tablespace.

Nologging And Force Logging

oracle tablespace logging 3It looks like someone at Oracle thought about the issue and designed the new tablespace model specifically for that purpose. Just put all your high volume unrecoverable objects in that tablespace and switch FORCE_LOGGING for all other tablespaces. The default geodatabase log file table configuration for Oracle is shared geodatabase log files. Use the following statement to create log file tablespaces in Oracle SQL Plus or Oracle SQL Developer. Since the architecture of Oracle Database 12c has changed, now we have two kind of databases Pluggable Databases (PDB) and Container Databases (CDB). Oracle Database will log all changes to all objects in the tablespace except changes to temporary segments, overriding any NOLOGGING setting for individual objects. Multitenant: PDB Logging Clause in Oracle Database 12c Release 1 ( The PDB logging clause is used to set the default tablespace logging clause for a PDB. One of them was the outcome of NOLOGGING operations, should the affected datafiles get damaged before we manage to take a backup of them. RMAN backup tablespace tbs; Starting backup at 15-SEP-09. For this reason oracle introduced the ALTER DATABASE FORCE LOGGING command in Oracle 9i R2. NOLOGGING can be also override at tablespace level using ALTER TABLESPACE FORCE LOGGING.

Srinivasarao Kandimalla’s Blog: What Is Logging,nologging And Force Logging

In Oracle 12c tablespace is a logical storage container that houses physical data files in which database. Data disappears from objects either after a commit or a session logs out. This Oracle tutorial explains how to use the Oracle CREATE TABLESPACE statement with syntax and examples. The CREATE TABLESPACE statement is used to allocate space in the Oracle database where schema objects are stored.