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But it is important to note that only the common case has this one-to-one relationship For example, consider this simple CREATE TABLE statement: Create table t ( x int primary key, y clob, z blob ); This statement creates six segments If you issue this CREATE TABLE statement in a schema that owns nothing, you ll observe the following: ops$tkyte@ORA10G> select segment_name, segment_type 2 from user_segments; no rows selected ops$tkyte@ORA10G> create table t ( x int primary key, y clob, z blob ); Table created..

special operations, such as a direct-path load using SQL*Loader, or a direct-path INSERT using the INSERT /*+ APPEND */ syntax, will not be logged (unless and until you ALTER the table and enable full logging again). In general, however, the operations your application performs against this table will be logged. After performing NOLOGGING operations in an ARCHIVELOG-mode database, you must take a new baseline backup of the affected data files as soon as possible, in order to avoid losing the data created by the NOLOGGING operation due to media failure. Since the data created by the NOLOGGING operation is not in the redo log files, and is not yet in the backups, you have no way of recovering it!

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You can identify composite keys easily by looking in the INDEX_NAME column. If the same INDEX_NAME entry appears more than once, it s a composite key, and you can see the columns that are part of the key in the COLUMN_NAME column. For example, INVENTORY_PK is the primary key of the INVENTORIES table and is defined on two columns: PRODUCT_ID and WAREHOUSE_ID. You can glean the order of the two columns in a composite key by looking at the COLUMN_POSITION column.

There are two ways to use the NOLOGGING option. You have already seen one method embedding the NOLOGGING keyword in the SQL command. The other method, which involves setting the NOLOGGING attribute on the segment (index or table), allows certain operations to be performed implicitly in a NOLOGGING mode. For example, I can alter an index or table to be NOLOGGING by default. This means for the index that subsequent rebuilds of this index will not be logged (the index will not generate redo; other indexes and the table itself might, but this index will not). Using the table T we just created, we can observe: ops$tkyte%ORA11GR2> create index t_idx on t(object_name); Index created. ops$tkyte%ORA11GR2> variable redo number ops$tkyte%ORA11GR2> exec :redo := get_stat_val( 'redo size' ); PL/SQL procedure successfully completed. ops$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...'); 3010840 bytes of redo generated... PL/SQL procedure successfully completed.

The INDEX_STATS view is useful for seeing how efficiently an index is using its space. Large indexes have a tendency to become unbalanced over time if many deletions are in the table (and therefore index) data. Your goal is to keep an eye on those large indexes with a view to keeping them balanced. Note that the INDEX_STATS view is populated only if the table has been analyzed by using the ANALYZE command, as follows: SQL> ANALYZE index hr.emp_name_ix VALIDATE STRUCTURE; Index analyzed. The query in Listing 7-26 using the INDEX_STATS view helps determine whether you need to rebuild the index. In the query, you should focus on the following columns in the INDEX_STATS view to determine if your index is a candidate for a rebuild: HEIGHT: This column refers to the height of the B-tree index, and it s usually at the 1, 2, or 3 level. If large inserts push the index height beyond a level of 4, it s time to rebuild, which flattens the B-tree. DEL_LF_ROWS: This is the number of leaf nodes deleted due to the deletion of rows. Oracle doesn t rebuild indexes automatically and, consequently, too many deleted leaf rows can lead to an unbalanced B-tree. BLK_GETS_PER_ACCESS: You can look at the BLK_GETS_PER_ACCESS column to see how much logical I/O it takes to retrieve data from the index. If this row shows a double-digit number, you should probably start rebuilding the index.

ops$tkyte@ORA10G> select segment_name, segment_type 2 from user_segments; SEGMENT_NAME -----------------------------SYS_IL0000063631C00002$$ SYS_LOB0000063631C00003$$ SYS_C009783 SYS_IL0000063631C00003$$ SYS_LOB0000063631C00002$$ T 6 rows selected. The table itself created a segment in this example: the last row in the output. The primary key constraint created an index segment in this case in order to enforce uniqueness. SEGMENT_TYPE -----------------LOBINDEX LOBSEGMENT INDEX LOBINDEX LOBSEGMENT TABLE

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