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The trick, as usual, is to go after the problems you can fix in the short run. Problems that you can fix by changing the memory allocation to the shared pool or the buffer cache you can easily handle almost immediately by dynamically adjusting the cache values. You can also take care of any changes that concern the redo logs right away. If you notice one or two users causing a CPU bottleneck, it may be a smart idea to kill those sessions so the database as a whole will perform better. As you know, prevention is much better than a cure, so consider using the Oracle Database Resource Manager tool ( 11 shows you in detail how to use the Database Resource Manager) to create resource groups and prevent a single user or group from monopolizing the CPU usage. If intense latch contention is slowing your database down, you probably should be setting the CURSOR_SHARING initialization parameter s value to FORCE or SIMILAR to ameliorate the situation. Most other changes, though, may require more time-consuming solutions. Some changes may even require major changes in the code or the addition or modification of important indexes. However, even if the problem isn t fixed immediately, you have learned your craft, and you re on the right path to improving instance performance. Although I ve discussed various methods and techniques that use SQL scripts to analyze instance performance, try to make the OEM Database Control (or Grid Control) the center of your database performance monitoring, and use Oracle s powerful tools, such as the ADDM, to save time. The AWR and ASH reports are also highly useful when searching for root causes of performance problems.

Last Used Ext BlockId: The block ID of the beginning of the last extent; the block ID within the last used file. Last Used Block: The offset of the last block used in the last extent. When you use SHOW_SPACE to look at objects in user space managed tablespaces, the output resembles this: big_table@ORA10G> exec show_space( 'BIG_TABLE' ) Free Blocks............................. 1 Total Blocks............................ 147,456 Total Bytes............................. 1,207,959,552 Total MBytes............................ 1,152 Unused Blocks........................... 1,616 Unused Bytes............................ 13,238,272 Last Used Ext FileId.................... 7 Last Used Ext BlockId................... 139,273 Last Used Block......................... 6,576 PL/SQL procedure successfully completed. The only difference is the Free Blocks item at the beginning of the report. This is a count of the blocks in the first freelist group of the segment. My script reports only on this freelist group. You would need to modify the script to accommodate multiple freelist groups. The commented code follows. This utility is a simple layer on top of the DBMS_SPACE API in the database. create or replace procedure show_space ( p_segname in varchar2, p_owner in varchar2 default user, p_type in varchar2 default 'TABLE', p_partition in varchar2 default NULL ) -- this procedure uses authid current user so it can query DBA_* -- views using privileges from a ROLE, and so it can be installed -- once per database, instead of once per user who wanted to use it authid current_user as l_free_blks number; l_total_blocks number; l_total_bytes number; l_unused_blocks number; l_unused_bytes number; l_LastUsedExtFileId number; l_LastUsedExtBlockId number; l_LAST_USED_BLOCK number; l_segment_space_mgmt varchar2(255); l_unformatted_blocks number; l_unformatted_bytes number; l_fs1_blocks number; l_fs1_bytes number;

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he Oracle data dictionary is the heart of the Oracle database management system. The data dictionary holds all the necessary information for Oracle to verify users, objects, privileges, and roles in the database. Understanding the data dictionary well is of paramount importance for an Oracle DBA. The first part of this chapter discusses the important static data dictionary views with which every DBA should be familiar. The second part deals with the equally important dynamic performance tables, which underlie instance management and performance tuning of the database. All database monitoring, whether manual or GUI-based, relies on the data dictionary and the dynamic performance views to provide an accurate picture of how the database is performing. The dynamic performance views capture all the important indicators of instance performance, including I/O rates, memory, hit ratios, and wait statistics.

Every Oracle database contains a set of read-only tables, which contain metadata (information about the various component of the database). The Oracle data dictionary is the heart of the database management system, and mastery of it will take you far in your quest to become an expert DBA. If you understand the data dictionary well, you can easily perform database management tasks. The data dictionary tables are located in the System tablespace and are read-only for all the database users except the user SYS. The data dictionary tables are updated when any database objects or user information changes (any DDL changes in the database modify the data dictionary). Following are some of the key database items for which you can use the data dictionary: User information Object information (tables, indexes, packages, and so on) Roles and privileges Constraint information Storage information (data files and tablespaces) Auditing information Operational information (backups, log files, archive log files, and so on)

One process might assume the role of caller or data provider with respect to the other.

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