Oracle11gR2 for Oracle10gR2          DBA          Biju Thomas       OneNeck IT Services          Session #313             ...
About me…• Senior Database Architect at OneNeck IT  Services Corporation (www.oneneck.com)• More than 18 years of Oracle e...
The ERP Outsourcing Experts : Provide a comprehensive,                                                  flexible suite of ...
Session Objectives• Review Oracle11gR2 features for DBA• Highlight Oracle11gR2 and 11gR1 behaviors  that are different fro...
Session Outline• 11gR2 DB Features  – Includes Features in 11.2.0.2 [patchset 1]• Installation & ASM Changes  – ASM is now...
11gR2 [11.2.0.1] &  11gR2ps1 [11.2.0.2]       FeaturesOracle Database & Tools
On Demand Segment Creation• New segments for tables, indexes, LOB columns  created only when row added to segment.• Partit...
Remove & Add Empty Segments• DBMS_SPACE_ADMIN package includes  programs to manage empty segments.  – DROP_EMPTY_SEGMENTS ...
Drop Segment in TRUNCATE                              select   segment_name, bytes                              from     u...
Zero-size Unusable Index                             select index_name,• If you alter any index            segment_created...
Change DB Link Password• The ALTER DATABASE LINK statement can  change user password in the database link.• ALTER DATABASE...
Concurrent Statistics Gather• Oracle11gR2 11.2.0.2 includes a new global  preference setting for Optimizer statistics  gat...
Audit Trail Management• DBMS_AUDIT_MGMT package to manage DB  and OS audit trail records.• API to move audit tables to ano...
Audit Trail Cleanup• Initialize the audit cleanup infrastructure using  INIT_CLEANUP• Optionally set the archive timestamp...
Audit Trail Cleanup – Contd.• Initializedbms_audit_mgmt.init_cleanup(  audit_trail_type =>  dbms_audit_mgmt.audit_trail_au...
Audit Trail Cleanup – Contd.• Create purge jobdbms_audit_mgmt.create_purge_job( audit_trail_type =>  dbms_audit_mgmt.audit...
Audit Trail Cleanup – Contd.SELECT *FROM   DBA_AUDIT_MGMT_CONFIG_PARAMS;PARAMETER_NAME                PARAMETER_VALUE   AU...
External Table Preprocessing• The preprocessor program converts the data to a record  format supported by the ORACLE_LOADE...
External Table Preprocessing – Contd.create directory data_dir as /home/biju/data_files;create directory exec_dir as /home...
External Table Preprocessing – Contd.create table zx_file (empno number(5),      empname varchar2(20), salary number (10,2...
DataPump Legacy Mode• If you are still using the legacy “exp” and “imp”  commands and comfortable with them, in 11gR2 data...
Scheduler: File Watcher• Start a job based on file arrival.• File watcher is a scheduler object that defines its  location...
Scheduler: Email Alerts• Scheduler can send emails based on job events.• ADD_JOB_EMAIL_NOTIFICATION procedure.• DBA_SCHEDU...
SQL*Plus Exit Commit• Prior to Oracle11gR2, the default behavior on  EXIT from SQL*Plus is COMMIT and exit.• In 11gR2, you...
11gR2 [11.2.0.1] &    11gR2ps1 [11.2.0.2]         Features      Installation, ASMGrid Infrastructure – Getting           S...
Full Install Patchsets• Beginning 11gR2, patch set 1 [11.2.0.2], patchsets include full  software install [patch number 10...
Automatic Software Update• The installer (OUI) connects to Metalink to check  for software updates and applies them.      ...
Install – New Warnings                         11gR2
Install – ASM is Grid Infrastructure• Starting 11gR2, ASM Oracle Home is separate  from Database Oracle Home.• ASM Oracle ...
Oracle Restart• Oracle components can be automatically  restarted after a hardware or software failure or  whenever host c...
Oracle Restart – Contd.• Use srvctl to manually start/stop components.$ srvctl start asm$ srvctl start database -d cecorde...
Oracle Restart – Contd.$   crsctl stat res -t-----------------------------------------------------------------------------...
SYSASM Privilege• Improves security by separating ASM  administration from DB administration.• Needed to stop/start ASM In...
ASMCA – Manage ASM• ASM Configuration     • Command line using  Assistant               the –silent option• supports insta...
Rename ASM Diskgroup• Possible to rename diskgroup when dg is not  mounted.• Database file names must be manually  renamed...
11gR1 [11.1.0.x] FeaturesQuick Review of Oracle11gR1Must-know non-Top Features
Alert log, Trace file Location• Automatic Diagnostic Repository (ADR) keeps all the log  and trace files.• DIAGNOSTIC_DEST...
Passwords are Case Sensitive• New users created in Oracle11g have case sensitive  password.• When upgrading from pre-11 re...
Changes to DEFAULT Profile• PASSWORD_LIFE_TIME is 180• PASSWORD_LOCK_TIME is 1• PASSWORD_GRACE_TIME is 7• FAILED_LOGIN_ATT...
Default Auditing• AUDIT_TRAIL parameter is set to DB• ALTER SYTEM, ALTER USER, ALTER  DATABASE, ALTER PROFILE actions are ...
Read-Only Table• New ALTER TABLE clause to make a table read-only.• If you try to perform insert or update or delete on re...
Tablespace for Temporary Tables• In pre-Oracle11g releases, the global temporary  table segments where created in the user...
Invisible Indexes• If you want to test the implications of creating an  index without affecting the application, you can  ...
Invisible Indexes – Contd.SQL> create index hr.employee_test on hr.employee (first_name) invisible;Index created.SQL> sele...
DB Protection Levels• DB_ULTRA_SAFE parameter controls the  protection level.• OFF: Values specified for DB_BLOCK_CHECKING...
DDL Lock Timeout• New parameter to specify the DDL lock wait time  – DDL_LOCK_TIMEOUT• Value specified in seconds, default...
WAIT in LOCK TABLE• The LOCK TABLE statement is enhanced to  include a WAIT clause.• You can now specify how many seconds ...
DDL Logging• To log all DDL operations in the alert log file, set the  parameter ENABLE_DDL_LOGGING.• The default value is...
Automatic Memory Configuration• New parameters – MEMORY_TARGET and  MEMORY_MAX_TARGET.• No need to specify SGA size (SGA_T...
Automatic Memory Configuration - Contd• The V$MEMORY_DYNAMIC_COMPONENTS view  shows the summarized information on all resi...
Parameter File from Memory• In pre-Oracle11g releases, we can create pfile  from spfile or spfile from pfile.• In Oracle11...
Misc: SQL*Plus Error Logging• SQL*Plus error logging to write ORA, PLS and SP2  errors – Default table name is SPERRORLOG....
Questions….???And… Thank You For Your Time• Please complete the session evaluation form   – Biju Thomas   – Oracle11gR2 fo...
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2011 Collaborate IOUG Presentation

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Oracle11gR2 for Oracle10gR2 DBA

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  1. 1. Oracle11gR2 for Oracle10gR2 DBA Biju Thomas OneNeck IT Services Session #313 http://www.oneneck.com
  2. 2. About me…• Senior Database Architect at OneNeck IT Services Corporation (www.oneneck.com)• More than 18 years of Oracle experience• Author of Oracle11g OCA, Co-author of Oracle10g (New Features), Oracle9i (SQL & Admin) and Oracle8i (SQL & Admin) certification guides published by Sybex/Wiley• Published articles in Oracle Magazine, Oracle Internals and Select Journal• Oracle 7, 8i, 9i, 10g, 11g OCP Administrator• Oracle Database SQL Certified Expert
  3. 3. The ERP Outsourcing Experts : Provide a comprehensive, flexible suite of outsourcing solutions designed specifically to help mid-market and public sector organizations Over 130 customers and 66,000 users in 45 countries on six continents ~ Over 950 customer sites supported worldwide98% Contract Renewal Rate over 13 yearsand 13 years of profitability (since inception)Ranked No. 1 ERP Management Outsourcer bythe Black Book of OutsourcingStop by Booth #939
  4. 4. Session Objectives• Review Oracle11gR2 features for DBA• Highlight Oracle11gR2 and 11gR1 behaviors that are different from 10gR2.• Discuss out-of-the-box features that can be implemented easily [covered in the Enterprise Edition Install].• These are not the top features of 11gR1 and 11gR2 release.
  5. 5. Session Outline• 11gR2 DB Features – Includes Features in 11.2.0.2 [patchset 1]• Installation & ASM Changes – ASM is now Grid Infrastructure – Patchset Installation – Getting Started with Grid Infrastructure• 11gR1 Features – Quick Review• Paper includes more info with examples and Oracle documentation reference for further reading.
  6. 6. 11gR2 [11.2.0.1] & 11gR2ps1 [11.2.0.2] FeaturesOracle Database & Tools
  7. 7. On Demand Segment Creation• New segments for tables, indexes, LOB columns created only when row added to segment.• Partitioned tables & indexes added to this feature in PS1.• Improves space usage as well as large application install time.• DEFERRED_SEGMENT_CREATION parameter controls this behavior.• New column SEGMENT_CREATED in DBA_TABLES, DBA_INDEXES. 11gR2
  8. 8. Remove & Add Empty Segments• DBMS_SPACE_ADMIN package includes programs to manage empty segments. – DROP_EMPTY_SEGMENTS – MATERIALIZE_DEFERRED_SEGMENTS• Three arguments – schema name, table name and partition name.EXEC SYS.dbms_space_admin.drop_empty_segments (schema_name=>BTHOMAS, table_name=>ODSEG_T1); 11gR2
  9. 9. Drop Segment in TRUNCATE select segment_name, bytes from user_segments• By default, Oracle where segment_name like ODSEG% Database deallocates all or segment_name in (select segment_name space used except that from user_lobs); specified by the SEGMENT_NAME BYTES ------------------------- ---------- MINEXTENTS storage ODSEG_T1 65536 ODSEG_T1_PK 65536 parameter. SYS_LOB0000097197C00003$$ 65536• In Oracle Database 11g truncate table odseg_t1 drop all storage; Table truncated. Release 2 (11.2.0.2), you select segment_name, bytes can use TRUNCATE with from user_segments where segment_name like ODSEG% the DROP ALL or segment_name in STORAGE option to drop (select segment_name from user_lobs ); entire segments. no rows selected 11gR2ps1
  10. 10. Zero-size Unusable Index select index_name,• If you alter any index segment_created, status from user_indexes; [b-tree, bitmap or INDEX_NAME SEG STATUS -------------------- --- -------- function based] to XX_T1_I1 YES VALID UNUSABLE, its storage alter index xx_t1_i1 unusable; Index altered. segments will be select index_name , dropped. segment_created, status• The parameter from user_indexes; INDEX_NAME SEG STATUS deferred_segment_crea -------------------- --- -------- XX_T1_I1 NO UNUSABLE tion does not have any select segment_name impact on this behavior. from dba_segments where segment_name = XX_T1_I1; no rows selected 11gR2
  11. 11. Change DB Link Password• The ALTER DATABASE LINK statement can change user password in the database link.• ALTER DATABASE LINK privilege needed to modify database links.• Private, PUBLIC and SHARED database link passwords can be changed.create database link myownlinkconnect to bthomas identified by justapwdusing CECORDEV;alter database link myownlink 11gR2connect to bthomas identified by mynewpwd1;
  12. 12. Concurrent Statistics Gather• Oracle11gR2 11.2.0.2 includes a new global preference setting for Optimizer statistics gathering.• The concurrent statistics gathering enables Oracle to gather statistics on multiple tables and table partitions concurrently.• The Job Scheduler will decide how many of these jobs will need to be run concurrently.exec DBMS_STATS.SET_GLOBAL_PREFS (CONCURRENT,TRUE); 11gR2ps1
  13. 13. Audit Trail Management• DBMS_AUDIT_MGMT package to manage DB and OS audit trail records.• API to move audit tables to another tablespace.• AUDIT_TRAIL_AUD_STD constant for AUD$ table, AUDIT_TRAIL_FGA_STD for FGA_LOG$ table, AUDIT_TRAIL_DB_STD for both.SQL>execute DBMS_AUDIT_MGMT.SET_AUDIT_TRAIL_LOCATION( -> AUDIT_TRAIL_TYPE => DBMS_AUDIT_MGMT.AUDIT_TRAIL_AUD_STD, -> AUDIT_TRAIL_LOCATION_VALUE => SYSAUX); 11gR2
  14. 14. Audit Trail Cleanup• Initialize the audit cleanup infrastructure using INIT_CLEANUP• Optionally set the archive timestamp using SET_LAST_ARCHIVE_TIMESTAMP. By default records older than this timestamp are deleted when purge job is invoked.• Purge the records using CLEAN_AUDIT_TRAIL.• Setup a job to clean records periodically using CREATE_PURGE_JOB. 11gR2
  15. 15. Audit Trail Cleanup – Contd.• Initializedbms_audit_mgmt.init_cleanup( audit_trail_type => dbms_audit_mgmt.audit_trail_aud_std, default_cleanup_interval => 24 /* 1 day */ );• Set Archive Timestampdbms_audit_mgmt.set_last_archive_timestamp( audit_trail_type => dbms_audit_mgmt.audit_trail_aud_std, last_archive_time => systimestamp-60);• Manual Purgedbms_audit_mgmt.clean_audit_trail( audit_trail_type => dbms_audit_mgmt.audit_trail_aud_std, 11gR2 use_last_arch_timestamp => true);
  16. 16. Audit Trail Cleanup – Contd.• Create purge jobdbms_audit_mgmt.create_purge_job( audit_trail_type => dbms_audit_mgmt.audit_trail_aud_std, audit_trail_purge_interval => 24 /* 1 day */ , audit_trail_purge_name => PURGE_DB_AUDIT_RECORDS, use_last_arch_timestamp => true);• Views – DBA_AUDIT_MGMT_CONFIG_PARAMS: Shows current parameters values. – DBA_AUDIT_MGMT_LAST_ARCH_TS: Shows last archive timestamp set for audit trail purges. – DBA_AUDIT_MGMT_CLEANUP_JOBS: Shows current cleanup jobs. – DBA_AUDIT_MGMT_CLEAN_EVENTS: Show history of purge events, DBA needs to manually purge records from this view, if it grows too large. 11gR2
  17. 17. Audit Trail Cleanup – Contd.SELECT *FROM DBA_AUDIT_MGMT_CONFIG_PARAMS;PARAMETER_NAME PARAMETER_VALUE AUDIT_TRAIL--------------------------- --------------- ---------------------DB AUDIT TABLESPACE SYSAUX STANDARD AUDIT TRAILDB AUDIT TABLESPACE SYSAUX FGA AUDIT TRAILAUDIT FILE MAX SIZE 10000 OS AUDIT TRAILAUDIT FILE MAX SIZE 10000 XML AUDIT TRAILAUDIT FILE MAX AGE 5 OS AUDIT TRAILAUDIT FILE MAX AGE 5 XML AUDIT TRAILDB AUDIT CLEAN BATCH SIZE 10000 STANDARD AUDIT TRAILDB AUDIT CLEAN BATCH SIZE 10000 FGA AUDIT TRAILOS FILE CLEAN BATCH SIZE 1000 OS AUDIT TRAILOS FILE CLEAN BATCH SIZE 1000 XML AUDIT TRAILDEFAULT CLEAN UP INTERVAL 24 STANDARD AUDIT TRAIL 11gR2
  18. 18. External Table Preprocessing• The preprocessor program converts the data to a record format supported by the ORACLE_LOADER access driver and then writes the converted record data to standard output (stdout), which the access driver reads as input.• Very useful in situations like if the input file is compressed format• New EXECUTE Privilege for Directory Objects.• Preprocess commands execute every time table is read.• DEFAULT DIRECTORY specifies the directory location of the data file. PREPROCESSOR specifies the executable directory and the name of the executable. 11gR2
  19. 19. External Table Preprocessing – Contd.create directory data_dir as /home/biju/data_files;create directory exec_dir as /home/biju/exec_scripts;grant read, write on directory data_dir to bthomas;grant execute on directory exec_dir to bthomas;$ pwd/home/biju/data_files$ ls -l-rw-r--r-- 1 oracle dba 99 Feb 25 19:33 emp_sal.txt.gz$ pwd/home/biju/exec_scripts$ ls -l-rwxr--r-- 1 oracle dba 13 Feb 25 19:39 run_zcat.sh$ cat run_zcat.sh/bin/zcat $1 11gR2
  20. 20. External Table Preprocessing – Contd.create table zx_file (empno number(5), empname varchar2(20), salary number (10,2)) organization external ( type oracle_loader default directory data_dir access parameters (records delimited by newline preprocessor exec_dir:run_zcat.sh fields terminated by ,) location (emp_sal.txt.gz));select * from zx_file; EMPNO EMPNAME SALARY---------- -------------------- ---------- 101 John King 1245.68 201 Matt Love 4567.33 345 Joshua Jacob 67533.9 11gR2
  21. 21. DataPump Legacy Mode• If you are still using the legacy “exp” and “imp” commands and comfortable with them, in 11gR2 data pump recognizes the legacy parameters.• The output file is written to default DATA_PUMP_DIR location, not to the current directory.• Can create a non-existent user during import.expdp file=bthomas.dmp log=bthomas.log owner=bthomas rows=nimpdp file=bthomas.dmp log=bthomas_imp.log fromuser=bthomas touser=bthomas_dump 11gR2
  22. 22. Scheduler: File Watcher• Start a job based on file arrival.• File watcher is a scheduler object that defines its location and other properties.• By default file watcher checks for arrival of a file every 10 minutes.• DBMS_SCHEDULER.CREATE_FILE_WATCHER procedure is used to create file watcher.• dba_scheduler_file_watchers view lists all active file watchers. 11gR2
  23. 23. Scheduler: Email Alerts• Scheduler can send emails based on job events.• ADD_JOB_EMAIL_NOTIFICATION procedure.• DBA_SCHEDULER_NOTIFICATIONS view. job_all_events job_over_max_dur job_broken job_run_completed job_chain_stalled job_sch_lim_reached job_completed job_started job_disabled job_stopped job_failed job_succeeded 11gR2
  24. 24. SQL*Plus Exit Commit• Prior to Oracle11gR2, the default behavior on EXIT from SQL*Plus is COMMIT and exit.• In 11gR2, you can define the behavior. The default behavior is COMMIT on EXIT, which can be made to ROLLBACK on EXIT usingSET EXITCOMMIT OFF 11gR2
  25. 25. 11gR2 [11.2.0.1] & 11gR2ps1 [11.2.0.2] Features Installation, ASMGrid Infrastructure – Getting Started
  26. 26. Full Install Patchsets• Beginning 11gR2, patch set 1 [11.2.0.2], patchsets include full software install [patch number 10098816].• No need to download and install base version and then patch.• Oracle recommends out of place install and upgrade. In place upgrade still supported.• Patchsets are still downloaded from Metalink [using wget is much easier]. client database p10098816_112020_Linux-x86-64_1of7.zip : Database part 1 p10098816_112020_Linux-x86-64_2of7.zip : Database part 2 deinstall p10098816_112020_Linux-x86-64_3of7.zip : Grid Infrastructure examples p10098816_112020_Linux-x86-64_4of7.zip : Client gateways p10098816_112020_Linux-x86-64_5of7.zip : Gateways p10098816_112020_Linux-x86-64_6of7.zip : Examples grid p10098816_112020_Linux-x86-64_7of7.zip : DeInstall 11gR2ps1
  27. 27. Automatic Software Update• The installer (OUI) connects to Metalink to check for software updates and applies them. 11gR2ps1
  28. 28. Install – New Warnings 11gR2
  29. 29. Install – ASM is Grid Infrastructure• Starting 11gR2, ASM Oracle Home is separate from Database Oracle Home.• ASM Oracle Home is known as Grid Infrastructure (GI).• Software distribution includes “database” and “grid”.• Grid single instance install software same for RAC install as well. 11gR2
  30. 30. Oracle Restart• Oracle components can be automatically restarted after a hardware or software failure or whenever host computer restarts. – ASM Instance – Mount Diskgroups – Oracle Notification Services [if enabled] – Listeners – Databases – Services• Knows dependency 11gR2
  31. 31. Oracle Restart – Contd.• Use srvctl to manually start/stop components.$ srvctl start asm$ srvctl start database -d cecordev• Use crsctl to enable Oracle Restart{GI_HOME}/bin/crsctl enable hasCRS-4622: Oracle High Availability Services autostart is enabled.{GI_HOME}/bin/crsctl start hasCRS-4123: Oracle High Availability Services has been started.• Configure components using srvctl$ srvctl add listener -l LISTENER_ASM -p "TCP:1521" -o $ORACLE_HOME$ srvctl config asmASM home: /u01/app/oracle/grid/11.2.0.2ASM listener: LISTENER_ASMSpfile: /u01/app/oracle/grid/11.2.0.2/dbs/spfile+ASM.oraASM diskgroup discovery string: 11gR2
  32. 32. Oracle Restart – Contd.$ crsctl stat res -t--------------------------------------------------------------------------------NAME TARGET STATE SERVER STATE_DETAILS--------------------------------------------------------------------------------Local Resources--------------------------------------------------------------------------------ora.LISTENER_ASM.lsnr ONLINE ONLINE gildv248ora.LISTENER_DB.lsnr ONLINE ONLINE gildv248ora.ORAARCH.dg ONLINE ONLINE gildv248ora.ORADATA.dg ONLINE ONLINE gildv248ora.asm ONLINE ONLINE gildv248 Startedora.ons OFFLINE OFFLINE gildv248--------------------------------------------------------------------------------Cluster Resources--------------------------------------------------------------------------------ora.cecordev.db 1 ONLINE ONLINE gildv248 Openora.cefsgdev.db 1 ONLINE ONLINE gildv248 Openora.cssd 1 ONLINE ONLINE gildv248ora.diskmon 1 ONLINE ONLINE gildv248ora.evmd 1 ONLINE ONLINE gildv248 11gR2
  33. 33. SYSASM Privilege• Improves security by separating ASM administration from DB administration.• Needed to stop/start ASM Instance, create diskgroups in 11gR2.• New OSASM group, similar to OSDBA and OSOPER.• Remote authentication possible using syntax sys@"myhost.mydomain.com:1521/+ASM" AS SYSASM 11gR2
  34. 34. ASMCA – Manage ASM• ASM Configuration • Command line using Assistant the –silent option• supports installing • dbca not available in and configuring ASM GI home instances, disk groups, volumes (ASMDVM), and Oracle ASM Cluster File System (ACFS) 11gR2
  35. 35. Rename ASM Diskgroup• Possible to rename diskgroup when dg is not mounted.• Database file names must be manually renamed.• Old diskgroups in Oracle Restart configuration must be removed manually.$ srvctl stop diskgroup -g oops1$ renamedg dgname=oops1 newdgname=good1 verbose=true$ srvctl start diskgroup –g good1 11gR2
  36. 36. 11gR1 [11.1.0.x] FeaturesQuick Review of Oracle11gR1Must-know non-Top Features
  37. 37. Alert log, Trace file Location• Automatic Diagnostic Repository (ADR) keeps all the log and trace files.• DIAGNOSTIC_DEST parameter replaces BACKGROUND_DUMP_DEST, USER_DUMP_DEST and CORE_DUMP_DEST parameters.• DIAGNOSTIC_DEST defaults to ORACLE_BASE if set, else ORACLE_HOME/log.• Alert log is under DIAGNOSTIC_DEST/diag/rdbms/database/instance/trac e. The XML version is under ../alert. 11gR1
  38. 38. Passwords are Case Sensitive• New users created in Oracle11g have case sensitive password.• When upgrading from pre-11 release, case sensitivity takes effect when you change password.• PASSWORD_VERSIONS and PASSWORD columns in DBA_USERS.• Disable case sensitivity by setting SEC_CASE_SENSITIVE_LOGON to FALSE.• ORAPWD has a new parameter – IGNORECASE.• For database links, the account in Oracle11g should have password in uppercase when linking from pre-11g database. 11gR1
  39. 39. Changes to DEFAULT Profile• PASSWORD_LIFE_TIME is 180• PASSWORD_LOCK_TIME is 1• PASSWORD_GRACE_TIME is 7• FAILED_LOGIN_ATTEMPTS is 10• ?/rdbms/admin/utlpwdmg.sql creates VERIFY_FUNCTION_11G, with enhanced password complexity checking.• $ORACLE_HOME/rdbms/admin/secconf.sql changes DEFAULT profile, and enables default auditing. 11gR1
  40. 40. Default Auditing• AUDIT_TRAIL parameter is set to DB• ALTER SYTEM, ALTER USER, ALTER DATABASE, ALTER PROFILE actions are audited.• CREATE USER, DROP USER, DROP PROFILE actions are audited.• Logins are audited (CREATE SESSION).• Most “ANY” privilege actions are audited.• Delete on AUD$ is audited and such records cannot be deleted.
  41. 41. Read-Only Table• New ALTER TABLE clause to make a table read-only.• If you try to perform insert or update or delete on read- only table, you get an ORA-12081 error.• Flashback, Truncate not allowed.• Drop table, drop indexes, drop constraints allowed.ALTER TABLE <table_name> READ ONLY;ALTER TABLE <table_name> READ WRITE;select owner, table_name, tablespace_namefrom dba_tableswhere read_only = YES; 11gR1
  42. 42. Tablespace for Temporary Tables• In pre-Oracle11g releases, the global temporary table segments where created in the user’s default temporary tablespace.• In Oracle11g, you can specify a tablespace for global temporary tablespace segments.create global temporary table customer_stage (cust_name number (10),col1 varchar2 (40),col2 varchar2 (60))on commit preserve rowstablespace temp; 11gR1
  43. 43. Invisible Indexes• If you want to test the implications of creating an index without affecting the application, you can make the index invisible. After testing, you may drop the index or make it visible.• To make the optimizer use invisible index, set the OPTIMIZER_USE_INVISIBLE_INDEXES to TRUE in the session.• INVISIBLE/VISIBLE clause is added to CREATE INDEX and ALTER INDEX statements 11gR1
  44. 44. Invisible Indexes – Contd.SQL> create index hr.employee_test on hr.employee (first_name) invisible;Index created.SQL> select index_name, visibility from dba_indexes 2 where owner = HR and table_name = EMPLOYEE;INDEX_NAME VISIBILIT------------------------------ ---------PK_EMPLOYEE VISIBLEEMPLOYEE_TEST INVISIBLESQL> select first_name, last_name from hr.employee 2 where first_name = John;------------------------------------------------------------------------------| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |------------------------------------------------------------------------------| 0 | SELECT STATEMENT | | 3 | 78 | 3 (0)| 00:00:01 ||* 1 | TABLE ACCESS FULL| EMPLOYEE | 3 | 78 | 3 (0)| 00:00:01 |------------------------------------------------------------------------------SQL> alter session set optimizer_use_invisible_indexes = true;Session altered.SQL> select first_name, last_name from hr.employee 2 where first_name = John;-------------------------------------------------------------------------------| Id | Operation | Name | Rows | Bytes | Cost (%CPU-------------------------------------------------------------------------------| 0 | SELECT STATEMENT | | 3 | 78 | 2 (0| 1 | TABLE ACCESS BY INDEX ROWID| EMPLOYEE | 3 | 78 | 2 (0|* 2 | INDEX RANGE SCAN | EMPLOYEE_TEST | 3 | | 1 (0 11gR1-------------------------------------------------------------------------------
  45. 45. DB Protection Levels• DB_ULTRA_SAFE parameter controls the protection level.• OFF: Values specified for DB_BLOCK_CHECKING, DB_BLOCK_CHECKSUM and DB_LOST_WRITE are taken.• DATA_ONLY: DB_BLOCK_CHECKING=MEDIUM, DB_BLOCK_CHECKSUM=FULL, DB_LOST_WRITE_PROTECT=TYPICAL• DATA_AND_INDEX: DB_BLOCK_CHECKING=FULL, DB_BLOCK_CHECKSUM=FULL, DB_LOST_WRITE_PROTECT=TYPICAL 11gR1
  46. 46. DDL Lock Timeout• New parameter to specify the DDL lock wait time – DDL_LOCK_TIMEOUT• Value specified in seconds, default is 0, max 1,000,000.• Parameter can be changed using ALTER SYSTEM or ALTER SESSION.• When the timeout expires, error returned as in previous releases.ORA-00054: resource busy and acquire with NOWAIT specified or timeout expired 11gR1
  47. 47. WAIT in LOCK TABLE• The LOCK TABLE statement is enhanced to include a WAIT clause.• You can now specify how many seconds you want the database to wait before returning the “resource busy” error.LOCK TABLE <table_name> IN EXCLUSIVE MODE WAIT 120; 11gR1
  48. 48. DDL Logging• To log all DDL operations in the alert log file, set the parameter ENABLE_DDL_LOGGING.• The default value is FALSE, means DDL logging is disabled.• Can be changed using ALTER SESSION or ALTER SYSTEMSun Jan 30 11:21:11 2011create table bthomas.test_table (nn number)Sun Jan 30 11:27:34 2011alter table bthomas.test_table modify (nn varchar2 (10))Sun Jan 30 11:29:43 2011drop table bthomas.test_table 11gR1
  49. 49. Automatic Memory Configuration• New parameters – MEMORY_TARGET and MEMORY_MAX_TARGET.• No need to specify SGA size (SGA_TARGET) and PGA size (PGA_AGGREGATE_TARGET) separately.• If SGA and PGA parameters are not set, the default initial allocation is 60% SGA and 40% PGA.• New view – V$MEMORY_TARGET_ADVICE. 11gR1
  50. 50. Automatic Memory Configuration - Contd• The V$MEMORY_DYNAMIC_COMPONENTS view shows the summarized information on all resize operations and shows the current sizes of all SGA components.• If you set the MEMORY_TARGET to a non-zero value, Oracle will manage memory automatically. The MEMORY_MAX_TARGET will default to the value of MEMORY_TARGET.• If you have also set SGA_TARGET and PGA_AGGREGATE_TARGET parameters, those values will be considered the minimums. 11gR1
  51. 51. Parameter File from Memory• In pre-Oracle11g releases, we can create pfile from spfile or spfile from pfile.• In Oracle11g, we can now create spfile or pfile from memory CREATE PFILE=/u01/oracle/admin/DB1/pfile/initD B1.ora FROM MEMORY; CREATE SPFILE FROM MEMORY; 11gR1
  52. 52. Misc: SQL*Plus Error Logging• SQL*Plus error logging to write ORA, PLS and SP2 errors – Default table name is SPERRORLOG. SET ERRORL[OGGING] {ON|OFF} [TABLE [schema.]tablename] [TRUNCATE] [IDENTIFIER identifier] SQL> desc sperrorlog Name Null? Type ---------------------- -------- ---------------- USERNAME VARCHAR2(256) TIMESTAMP TIMESTAMP(6) SCRIPT VARCHAR2(1024) IDENTIFIER VARCHAR2(256) MESSAGE CLOB STATEMENT CLOBSQL> set errorlogging on 11gR1
  53. 53. Questions….???And… Thank You For Your Time• Please complete the session evaluation form – Biju Thomas – Oracle11gR2 for Oracle10gR2 DBA – Session # 313• Further questions, comments… – Stop by Booth #939 – WWW.ONENECK.COM

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