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Normally objects are created in a LOGGING fashion, meaning all operations performed against them that can generate redo will generate it. NOLOGGING allows certain operations to be performed against that object without the generation of redo; we covered this in the last chapter in some detail. NOLOGGING affects only a few specific operations, such as the initial creation of the object, or direct path loads using SQL*Loader, or rebuilds (see the Oracle SQL Reference manual for the database object you are working with to see which operations apply). This option does not disable redo log generation for the object in general only for very specific operations. For example, if I create a table as SELECT NOLOGGING and then INSERT INTO THAT_TABLE VALUES ( 1 ), the INSERT will be logged, but the table creation might not have been (the DBA can force logging at the database or tablespace level).

Oracle s read-committed level of isolation provides protection against dirty reads and lost updates because queries read data only after the COMMIT statement is executed. The transactions are all consistent on a per-statement basis. Readers will not block writers of transactions, and vice versa. As you can see, Oracle s default read-committed isolation level doesn t guarantee you ll avoid the nonrepeatable-read and phantom-read problems. Oracle guarantees only statement-level, not transaction-level, read consistency. However, Oracle allows you to explicitly change the default read-committed isolation level by selecting the serializable isolation level as an alternative.

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Then I ran equivalent INSERTs, UPDATEs, and DELETEs against both the PERM and TEMP tables: ops$tkyte%ORA11GR2> set serveroutput on format wrapped ops$tkyte%ORA11GR2> begin 2 do_sql( 'insert into perm 3 select 1,1,1 4 from all_objects 5 where rownum <= 500' ); 6 7 do_sql( 'insert into temp 8 select 1,1,1 9 from all_objects 10 where rownum <= 500' ); 11 dbms_outputnew_line; 12 13 do_sql( 'update perm set x = 2' ); 14 do_sql( 'update temp set x = 2' ); 15 dbms_outputnew_line; 16 17 do_sql( 'delete from perm' ); 18 do_sql( 'delete from temp' ); 19 end; 20 / 3,330,636 bytes of redo generated for "insert into perm 68,492 bytes of redo generated for "insert into temp 2,519,848 bytes of redo generated for "update perm set x = 2".. 1,106,960 bytes of redo generated for "update temp set x = 2"...

The read-committed level of isolation provides a great deal of concurrency and consistency in the database. However, this mode does not provide transaction-level consistency. Because it s a statement-level isolation, changes made in between statements in a transaction may not be seen by a query, and for this reason you ll continue to have the nonrepeatable-read problem; you simply can t be guaranteed the same results if you repeat your queries. The phantom-read problem also still lurks because the model doesn t prevent other transactions from updating tables in between your queries.

Each block in a segment has a block header. Part of this block header is a transaction table. Entries will be made in the transaction table to describe which transactions have what rows/elements on the block locked. The initial size of this transaction table is specified by the INITRANS setting for the object. For tables, this defaults to 2 (indexes default to 2). This transaction table will grow dynamically as needed up to MAXTRANS entries in size (given sufficient free space on the block, that is). Each allocated transaction entry consumes 23 to 24 bytes of storage in the block header. Note that as of Oracle 10g, MAXTRANS is ignored all segments have a MAXTRANS of 255.

The serializable isolation level will treat the database as a single-user database, thus eliminating the data anomalies caused by simultaneous use and modification of the data By using the ALTER SESSION statement, you can serialize the isolation level, thus avoiding the concurrency problems You can change the isolation level from the default level of read-committed to a serializable isolation level using the following statement: SQL> ALTER SESSION SET ISOLATION LEVEL SERIALIZABLE; Once you execute this statement, you are shielded from all transactions, committed as well as uncommitted, that have occurred since you set the transaction Instead of using the serializable isolation level, you can also use the SET TRANSACTION READ ONLY command to give you repeatable reads without phantom reads A serializable level of isolation is suited for databases where multiple consistent queries are made during an update transaction.

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