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    •  
    • Steve George Sr. Delivery Manager Oracle University Oracle Corporation
    • Tips, tricks and Techniques for the Oracle Database
    • Overview
      • This course concentrates on Oracle9 i Release 2 new features applicable to database administration
      • Previous experience with Oracle databases is required for a full understanding of many new features, particularly Oracle8 and Oracle8 i
    • Displaying Execution Plans SQL*Plus Autotrace
      • Create the plan_table table.
      • Create and grant the plustrace role.
      • Autotrace syntax:
      SQL> @$ORACLE_HOME/sqlplus/admin/plustrce.sql SQL> GRANT plustrace TO scott; SET AUTOTRACE [ Off | On | Traceonly ] [ Explain | Statistics ]
    • Generate the Execution Plan
      • Can be used without tracing
      • Needs the plan_table table utlxplan.sql
      • Create the explain plan:
      SQL> EXPLAIN PLAN FOR 2 SELECT last_name FROM hr.employees;
    • Query the plan_table Table Using dbms_xplan.display
      • Query plan_table to display the execution plans:
        • Query plan_table directly.
        • Use script utlxpls.sql (hide Parallel Query information).
        • Use script utlxplp.sql (show Parallel Query information).
        • Use the dbms_xplan package.
      SQL> SELECT * 2 FROM TABLE(dbms_xplan.display);
    • Metadata API in Oracle9 i
      • A new package, DBMS_METADATA , is introduced.
      • Using this package, you can extract metadata in:
        • Browsing mode , or
        • Programmatic mode where the program can specify:
          • The types of objects to be retrieved
          • Various selection criteria
          • Transformation of the output by default is XML , but can be of any format (uses XSL) .
    • Metadata API in Oracle9 i Browsing Example
      • The query can have a WHERE clause.
      • Output is in SQL, but can be in XML format.
      • Combine with a SPOOL statement for XML file
      • Any combination of objects can be extracted, depending on the result of the SELECT statement.
      • Running a spool while extracting provides a file that can be edited immediately.
      SQL> SELECT dbms_metadata.get_ddl ('TABLE','SALES') 2 FROM dual;
    • Default Partition for List Partitioning
      • Create a DEFAULT partition for all values not covered by other list partitions:
      CREATE TABLE customer ... PARTITION BY LIST (state) (PARTITION p1 VALUES ('CA','CO'), PARTITION p2 VALUES ('FL','TX'), PARTITION p3 VALUES ( DEFAULT ) );
    • Range List Composite Partitioning List (state) Range (month) CREATE TABLE customer ... PARTITION BY RANGE (month) SUBPARTITION BY LIST (state) ...; p1_s1 p1_s2 p1_s3 p2_s1 p2_s2 p2_s3 p3_s1 p3_s2 p3_s3 p4_s1 p4_s2 p4_s3 < 3 < 6 < 9 < 12 'CA', 'CO' Default 'FL', 'TX'
    •  
    • Composite Partitioning Using a Template
      • Use a subpartition template for:
        • Range list partitions
        • Range hash partitions
      CREATE TABLE state_sales ... PARTITION BY RANGE (month) SUBPARTITION BY LIST (state) SUBPARTITION TEMPLATE (SUBPARTITION s1 VALUES ('CA,''CO') SUBPARTITION s2 VALUES ('FL','TX') ) ...
    • Rename Columns and Constraints SQL> ALTER TABLE employees 2 RENAME COLUMN salary TO sal; SQL> ALTER TABLE employees 2 RENAME CONSTRAINT sys_c002691 3 TO pk_employees_id;
    • RMAN: Control Archived Log Space Usage
      • Avoid errors caused by insufficient disk space for restored archived logs during recovery
      • Define size available for storage of archived logs copied to disk from backup sets
      • Use MAXSIZE option in conjunction with DELETE option
      RMAN> RECOVER DATABASE 2> DELETE 3> ARCHIVELOG MAXSIZE 100K;
    • Backing Up the Server Parameter File
        • Automatically backed up when CONFIGURE CONTROLFILE AUTOBACK = ON
        • Explicitly backed up with BACKUP SPFILE
      RMAN> BACKAUP COPIES 2 DEVICE TYPE sbt SPFILE; RMAN> BACKUP SPFILE;
    • Persistent Configuration Parameters
      • Customizable configuration parameters simplify RMAN operations.
      • Default settings are set once and used for subsequent jobs.
      • A DBA can invoke RMAN and back up a database with one command: BACKUP DATABASE .
      • Oracle9 i provides the new CONFIGURE command to override default settings persistently.
      • The configuration values are stored in the control file and are resynchronized to the recovery catalog as necessary.
    • Automatic Channel Allocation
      • This feature applies to BACKUP , COPY , and RESTORE commands.
      • A channel is automatically allocated if one is not explicitly specified in the RMAN command.
      • Default values are specified with the CONFIGURE command.
      • The benefit of this feature is a usability improvement due to the simplification of subsequent commands.
    • CONFIGURE CHANNEL Command
      • Used to configure settings that will be used for the channels (all or individual):
      CONFIGURE CHANNEL [n] <channel_option_list>; channel_option_list := TYPE, NAME, PARMS, CONNECT STRING, DEBUG, FORMAT, TRACE, MAXPIECESIZE, RATE, MAXOPENFILES, SEND
    •  
    • Enterprise Manager Backup Wizard
    • Backup Wizard: Deletion of Archived Logs
    • Backup Wizard: Override RMAN Configuration
    • DBNEWID Utility
      • The DBID of a database
      • The DBNAME of a database
      • Both the DBNAME and DBID of a database
      d:>nid DBNEWID: Release 9.2.0.1.0 - Production Copyright (c) 1995, 2002, Oracle Corporation. All rights reserved. Keyword Description (Default) ---------------------------------------------------- TARGET Username/Password (NONE) DBNAME New database name (NONE) LOGFILE Output Log (NONE) REVERT Revert failed change NO SETNAME Set a new database name only NO APPEND Append to output log NO HELP Displays these messages NO
    • Shared Pool Advisory SQL> SELECT shared_pool_size_for_estimate AS pool_size, 2 estd_lc_size, estd_lc_time_saved 3 FROM v$shared_pool_advice; POOL_SIZE ESTD_LC_SIZE ESTD_LC_TIME_SAVED --------- ------------ ------------------ 32 8 7868 40 15 7868 48 17 7868 56 17 7868 64 17 7868 72 17 7868 80 17 7868 88 17 7868 96 17 7868
    •  
    • Enterprise Manager Shared Pool Size Advisor
    • Mean Time To Recover (MTTR) Advisory
      • Collect statistics by setting initialization parameters
        • FAST_START_MTTR_TARGET to non-zero value
        • STATISTICS_LEVEL to TYPICAL or ALL
      • View estimated overhead for different settings of FAST_START_MTTR_TARGET
        • In the rows of the view v$mttr_target_advice
        • Through the Enterprise Manager graphical interface to this view
    • View MTTR Advisory with Enterprise Manager
    • V$PGA_TARGET_ADVICE TARGET_MB CACHE_HIT_PERCENT ESTD_OVERALLOC_COUNT ---------- ----------------- -------------------- 63 23 367 125 24 30 250 30 3 375 39 1 500 58 0 600 59 0 700 59 0 800 60 0 900 60 0 1000 61 0 1500 67 0 2000 76 0 3000 83 0 4000 85 0
    •  
    • PGA Sizing Advice Conclusions LOW_KB HIGH_KB OPTIMAL ONEPASS MPASS ------ ------- ------- ------- ------- 8 16 156107 0 0 16 32 148 0 0 32 64 89 0 0 64 128 13 0 0 128 256 58 0 0 256 512 10 0 0 512 1024 653 0 0 1024 2048 530 0 0 2048 4096 509 0 0 4096 8192 227 0 0 8192 16384 176 0 0 16384 32768 133 14 0 32768 65536 66 103 0 65536 131072 15 47 0 131072 262144 0 48 0 262144 524288 0 23 0
    •  
    • PGA Sizing Advisor Output in Enterprise Manager
    • Data Compression CREATE TABLE employees( employee_id INTEGER, first_name VACHAR2(20), … ) COMPRESS; CREATE TABLESPACE sample   DATAFILE 'sample01.dbf' SIZE 20M    DEFAULT COMPRESS ; CREATE TABLE countries( country_id CHAR(2), country_name VARCHAR2(40), region_id NUMBER ) NOCOMPRESS TABLESPACE sample;
    •  
    • Data Compression Optimization: Enabling Row Movement CREATE TABLE employees (employee_id NUMBER, first_name VARCHAR2(20), last_name VARCHAR2(30), ...) ENABLE ROW MOVEMENT; ( both partitioned and nonpartitioned )
    • Locally Managed SYSTEM Tablespace
      • Create databases with a locally managed SYSTEM tablespace:
      CREATE DATABASE mydb ... DATAFILE ' system01.dbf ' SIZE 100M EXTENT MANAGEMENT LOCAL ...;
    • Flashback Queries -- Query based on past SCN number: SELECT employee_id, manager_id FROM employees AS OF SCN 81591; -- Find changes made between 1-2 hours ago: SELECT a.last_name, b.last_name FROM employees AS OF TIMESTAMP SYSDATE-1/24 a FULL OUTER JOIN employees AS OF TIMESTAMP SYSDATE-2/24 b ON (a.employee_id = b.employee_id) -- Create new table based on old data: CREATE TABLE new_employees AS SELECT * FROM employees AS OF SCN 90932;
    • Reminder – please complete the OracleWorld session survey Thank you.
    • Next Steps….
      • Be sure to visit the DemoGrounds and see Oracle software and services in action
      • Check out Meet the Gurus in the DemoGrounds for your opportunity to meet top Oracle developers
      • Attend Mini Theatre presentations relevant to your job role and education needs
      • Don’t forget you can take exams onsite for only $50!
      • Remember to register for any OU inClass course within 60 days of OracleWorld and receive 15% discount
    • Next Steps….
      • See Your Business in Our Software
        • Visit the DEMOogrounds for a customized architectural review, see a customized demo with Solutions Factory, or receive a personalized proposal. Visit the DEMOgrounds for more information.
      • Relevant web sites to visit for more information
        • www.oracle.com/education
    • Reminder – please complete the OracleWorld session survey Thank you.
    • A Q & Q U E S T I O N S A N S W E R S