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Listing 7-26. Using the INDEX_STATS View to Determine Whether to Rebuild an Index SQL> 2 3 4 5 6 7 SELECT height, blocks, name, lf_rows, lf_blks, del_lf_rows, rows_per_key /*Height of the B-Tree*/ /* Blocks in the index segment */ /*index name */ /* number of leaf rows in the index */ /* number of leaf blocks in the index */ /* number of deleted leaf rows in the index */ /* average number of rows per distinct key */ /* consistent mode block reads (gets) */

Note Again, this example was performed in an ARCHIVELOG-mode database. You would not see the differences

8 blk_gets_per_access 8 FROM INDEX_STATS 9* WHERE name='EMP_NAME_IX'; HEIGHT -----16 SQL> BLOCK ----------EMP_NAME_IX LF_ROWS ------107

Note A unique or primary key constraint may or may not create a new index. If there is an existing index

LF_BLKS -------1

in redo size in a NOARCHIVELOG mode database as the index CREATE and REBUILD operations are not logged in NOARCHIVELOG mode.

DEL_LF_ROWS ----------0

on the constrained columns, and these columns are on the leading edge of the index, the constraint can and will use them.

When the index is in LOGGING mode (the default), a rebuild of it generated 3MB of redo log. However, we can alter the index: ops$tkyte%ORA11GR2> alter index t_idx nologging; Index altered. ops$tkyte%ORA11GR2> exec :redo := get_stat_val( 'redo size' );

ROWS_PER_KEY -----------1

BLK_GETS --------1

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Additionally, each of the LOB columns created two segments: one segment to store the actual chunks of data pointed to by the character large object (CLOB) or binary large object (BLOB) pointer, and one segment to organize them. LOBs provide support for very large chunks of information, up to many gigabytes in size. They are stored in chunks in the lobsegment, and the lobindex is used to keep track of where the LOB chunks are and the order in which they should be accessed.

PL/SQL procedure successfully completed. ops$tkyte%ORA11GR2> alter index t_idx rebuild; Index altered. ops$tkyte%ORA11GR2> exec dbms_output.put_line( (get_stat_val('redo size')-:redo) || ' bytes of redo generated...'); 62712 bytes of redo generated... PL/SQL procedure successfully completed. And now it generates a mere 62KB of redo. But that index is unprotected now. If the data files it was located in failed and had to be restored from a backup, we would lose that index data. Understanding that fact is crucial. The index is not recoverable right now we need a backup to take place. Alternatively, the DBA could just re-create the index as we can re-create the index directly from the table data as well.

ransaction management is at the heart of database processing In order for a large number of users to run concurrent transactions, the DBMS must manage the transactions with the least amount of conflict while ensuring the consistency of the database Transaction management ensures that a database is accessible to many users simultaneously, and that users can t undo each other s work A transaction is a logical unit of work consisting of one or more SQL statements Transactions may encompass all of your program or just a part of it A transaction may perform one operation or an entire series of operations on the database objects, either interactively or as part of a program Transactions are begun implicitly whenever data is read or written, and they are ended by a COMMIT or ROLLBACK statement In this chapter, I cover the basics of transaction management.

I start with an explanation of a transaction in the context of a relational database, I explain the main types of data anomalies, and I explain the standard transaction isolation levels and Oracle s implementation of the read-committed isolation level for maintaining consistency and concurrency The concept of serializability is crucial in transaction processing Concurrency of usage gives relational databases their great strength, and serializability conditions ensure the concurrency of database transactions In this chapter, I explain how Oracle uses the twin techniques of transaction locking and multiversion concurrency control using undo records to enforce serializability in transactions The other component in Oracle s transaction management is its automatic locking feature, which helps Oracle increase concurrency Undo space management is an important part of transaction management, and in this chapter you ll learn about the Automatic Undo Management (AUM) feature.

The operations that may be performed in a NOLOGGING mode are as follows: Index creations and ALTERs (rebuilds). Bulk INSERTs into a table using a direct-path INSERT such as that available via the /*+ APPEND */ hint or SQL*Loader direct-path loads. The table data will not generate redo, but all index modifications will (the indexes on this nonlogged table will generate redo!). LOB operations (updates to large objects do not have to be logged). Table creations via CREATE TABLE AS SELECT. Various ALTER TABLE operations such as MOVE and SPLIT.

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