Parallel DML Tip 3: Parallelizing INSERT, MERGE, UPDATE, and DELETE.
3 Oracle Rdb Journal – NOLOGGING Option The Rdb Technical Corner is a regular feature of the Oracle Rdb Web Journal. Blocks written by NOLOGGING operations on the primary database are recorded in the control file of the physical standby database and can be recovered with a new RMAN command: RECOVER DATABASE NONLOGGED BLOCK. This operation will complete significantly faster than DELETE and with minimum logging, but you have to take a backup afterwards to establish a new baseline. Tom I've been re-visiting my knowledge on NOLOGGING as a colleague asked me a question about it today and I hate to say I couldn't remember fully why the term is a tiny bit of a misnomer (there's no denying that there is a general confusion "out there" about NOLOGGING and its consequences for redo generation, recoverability etc.
In Oracle 12c Release 2, a new mechanism has been introduced in Oracle Data Guard. REDO is how Oracle …
If it is done at the tablespace level then we create indexes or tables in this tablespace; they will be in NOLOGGING mode. Guide to Database Maintenance: NOLOGGING Option Introduction It is one of several ways to control the delicate balance between recoverability and performance. LOGGING/NOLOGGING helps manage enabling direct path writes in order to reduce the generation of REDO and UNDO. Deleting some rows or tens of millions of rows from an Oracle database should be treated in a completely different fashion. There are two approaches to backup and recovery in the presence of NOLOGGING operations: ETL … NOLOGGING: Oracle will generate a minimal number of redo log entries in order to protect the data dictionary, and the operation will probably run faster. ). Oracle Architecture Background Information. The examples in this article use SQL language from Oracle Rdb release 7.1 and later versions.
An explicit PARALLEL hint for a table in a statement overrides the effect of the PARALLEL attribute in the data dictionary. When the table or partition has the PARALLEL attribute in the data dictionary, that attribute setting is used to determine parallelism of INSERT, UPDATE, and DELETE statements and queries. Create Index in NOLOGGING Mode example CREATE TABLE ORDERS (ORDER_ID NUMBER NOT NULL ENABLE, COURSE_ID NUMBER NOT NULL ENABLE, STUDENT_ID NUMBER NOT NULL ENABLE, ORDER_DATE DATE, CONSTRAINT PK_ORDER_ID PRIMARY KEY (ORDER_ID) ); -- create Index in NOLOGGING mode CREATE INDEX orders_idx_nologging ON orders (student_id) NOLOGGING; Perform the massive DELETE operation as a direct-path (direct-load) INSERT (INSERT with APPEND hint) into a table whose logging parameter is set to NOLOGGING. In Closing As demonstrated, using the NOLOGGING option can be a time saver, but it can also put you at risk if you do not use it wisely. When the table or partition has the PARALLEL attribute in the data dictionary, that attribute setting is used to determine parallelism of INSERT, UPDATE, and DELETE statements and queries. Oracle Database does not currently enforce this rule, so DBAs must schedule the backup jobs and the ETL jobs such that the NOLOGGING operations do not overlap with backup operations. Oracle Data Guard and NOLOGGING in Oracle 12.2. Logging can be disabled at the table level or the tablespace level. Subsequent DML statements (UPDATE, DELETE, and conventional path insert) are unaffected by the NOLOGGING attribute of the table and generate redo.
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