oracle database 12.1.0.2 new features

Oracle Database 12.1.0.2 New Features

Deiby Gómez Oracle Database Consultant

Alex Zaballa Oracle DBA

Deiby Gómez

http://www.oraclefromguatemala.com.gt

@hdeiby

Alex Zaballa

http://alexzaballa.blogspot.com/

@alexzaballa146 and counting…

Oracle Database 12.1.0.2 New FeaturesDeiby Gómez

Approximate Count Distinct

COUNT(DISTINCT expression)

Cost

6

Full Database Caching

DB size > Buffer Cache

Little tables:• Allocated in memory If the table size < 2% of the Buffer Cache size

Medium tables:• Allocated in memory if table size [2%,10%] of Buffer Cache size (No official

information)• Oracle analyze the date when the table was used last time• Free space in Buffer Cache• Etc

Big Tables• Big tables are not allocated in Buffer Cache • Use "KEEP” to advice Oracle to allocate a big table in Buffer Cache

7


Buffer Cache > DB size

Little tables:• Allocated in memory If the table size < 2% of the Buffer Cache size

Medium tables:• Allocated in memory if table size [2%,10%] of Buffer Cache size (No official

information)• Oracle analyze the date when the table was used last time• Free space in Buffer Cache• Etc

Big Tables• Big tables are not allocated in Buffer Cache • Use "KEEP” to advice Oracle to allocate a big table in Buffer Cache

© 2014 Pythian Confidential 8


Buffer Cache > DB size

What about if I enable it but Buffer Cache !> DB Size?

• Algorithms to allocate small, medium and large tables are not used.• More Objects Deallocation• New object scanned, blocks deallocated.


PDB CONTAINERS ClauseSELECT ename FROM CONTAINERS(scott.emp) WHERE CON_ID IN (11, 13);

PDB File Placement in OMF

• FILE_NAME_CONVERT clause of CREATE PLUGGABLE DATABASE

• CREATE_FILE_DEST clause of CREATE PLUGGABLE DATABASE

• DB_CREATE_FILE_DEST (root level)

• PDB_FILE_NAME_CONVERT initialization parameter

PDB Logging Clause

• Table Level – Logging

• Index Level – Logging

• Tablespace Level – Logging

• Tablespace Level - Force Logging

• PDB Level – Logging

• PDB Level - Force No logging

• CDB - Force Logging

PDB Metadata Clone

NO DATA clause of the CREATE PLUGGABLE DATABASE

“This clause is useful for quickly creating clones of a PDB with

only the object definitions and no data.”


PDB Remote Clone

IN SOURCE DB:

**alter pluggable database pdbsource open read only;

create user C##dgomez identified by manager1;

grant create session to C##dgomez;


PDB Remote CloneIN TARGET DB:

create user C##dgomez identified by manager1;grant create session, create database link, create pluggable database to C##dgomez;

PDBSOURCE =(DESCRIPTION =(ADDRESS = (PROTOCOL = TCP)(HOST = db12102.oraworld.com)(PORT = 1521))(CONNECT_DATA =(SERVER = DEDICATED)(SERVICE_NAME = pdbsource)))

create database link dblinktosource connect to C##dgomez identified by manager1 using 'PDBSOURCE';

create pluggable database pdbtarget3 from pdbsource@dblinktosource;


PDB Remote Clone

Target: 12.1.0.2Source: 12.1.0.1

SQL> create pluggable database pdbtarget from pdbsource@dblinktosource;*ERROR at line 1:ORA-17627: ORA-00600: internal error code, arguments: [ksrpcsexec_1], [158],[20], [], [], [], [], [], [], [], [], []ORA-17627: ORA-00600: internal error code, arguments: [ksrpcsexec_1], [158],[20], [], [], [], [], [], [], [], [], []


PDB Remote CloneTarget: 12.1.0.1Source: 12.1.0.1

SQL> create pluggable database pdbtarget from sourcepdb@dblinktosource*ERROR at line 1:ORA-17628: Oracle error 19505 returned by remote Oracle serverORA-19505: failed to identify file ""


PDB Remote Clone

Target: 12.1.0.2Source: 12.1.0.2

SQL> create pluggable database pdbtarget from pdbsource@dblinktosource;

Pluggable database created.


PDB STANDBYS Clause

PDB1

PDB2

PDB3

PDB1

PDB2

PDB3

Primary Standby

• Datafiles Offline• Unnamed


PDB STANDBYS Clause

“The STANDBYS clause of the CREATE PLUGGABLE DATABASE statement specifies

whether the new PDB is included in standby CDBs”

STANDBYS=ALL includes the new PDB in all of the standby CDBs. STANDBYS=NONE excludes the new PDB from all of the standby CDBs.


PDB STANDBYS Clause

“It is possible to enable a PDB on a standby CDB after it was excluded

on that standby CDB.”

PDB data files need to be copied to the standby database from the primary database

The control file needs to be updated to reflect their paths

Execute ALTER PLUGGABLE DATABASE ENABLE RECOVERY It automatically onlines all of the data files belonging to the PDB.


PDB State Management Across CDB Restart

Source: "Oracle Database 12c: New Features for Administrators” by Oracle University

12.1.0.1



1. Set the PDB at the State you want to save.

2. SQL> alter pluggable database pdb1 save state;

Pluggable database altered.

or

SQL> alter pluggable database pdb1 discard state;


12.1.0.2



SQL> ALTER PLUGGABLE DATABASE ALL EXCEPT PDB1 SAVE STATE;


SQL> ALTER PLUGGABLE DATABASE ALL SAVE STATE;


12.1.0.2


PDB Subset Cloning

“The USER_TABLESPACES clause of the CREATE PLUGGABLE DATABASE statement

specifies which tablespaces are available in the new PDB”

o List one or more tablespaces to include.

o Specify ALL, the default, to include all of the tablespaces.

o Specify ALL EXCEPT to include all of the tablespaces, except for the tablespaces listed.

o Specify NONE to exclude all of the tablespaces.


Database Source

PDB Subset Cloning

Tablespace 1

Tablespace 2

Tablespace 3

PDB 1Tablespace 1

PDB 2Tablespace 2

PDB 3Tablespace 3

More Oracle Database 12.1.0.2 New FeaturesAlex Zaballa

JSON

OTN Article by Alex Zaballa

http://www.oracle.com/technetwork/pt/articles/sql/json-oracle-database-12c-2378776-ptb.html




JSON

• Oracle Database 12.1.0.2 has now native support for JSON.

• “JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easy for humans to read and write. It is easy for machines to parse and generate.”

Source: http://json.org/

More Oracle Database 12c New Features

Data Redaction

OTN Article in English by Alex Zaballa

http://www.oracle.com/technetwork/articles/database/data-redaction-odb12c-2331480.html




Data Redaction

• One of the new features introduced in Oracle Database 12c

• Part of the Advanced Security option• Enables the protection of data shown to the

user in real time, without requiring changes to the application

Data Redaction

SQL Query Row Limits and Offsets


create table tabela_teste (codigo number, nome varchar2(20), salario number); insert into tabela_teste values (1,'Alex' ,100);insert into tabela_teste values (2,'Joao' ,200);insert into tabela_teste values (3,'Maria' ,300);insert into tabela_teste values (4,'Pedro',400);insert into tabela_teste values (5,'Paulo',500);insert into tabela_teste values (6,'Fernando',600);insert into tabela_teste values (7,'Rafael',700);insert into tabela_teste values (8,'Samuel',700);insert into tabela_teste values (9,'Daniel',800);insert into tabela_teste values (10,'Luciano',1000);


Top-N Queries – Pré 12c

select * from ( select codigo, nome, salario from tabela_teste order by salario desc)where rownum <= 5


select codigo, nome, salario from tabela_testeorder by salario descFETCH FIRST 5 ROWS ONLY


select codigo, nome, salario from tabela_testeorder by salario FETCH FIRST 30 PERCENT ROWS ONLY


select codigo, nome, salario from tabela_testeorder by salario desc OFFSET 2 ROWS FETCH NEXT 2 ROWS ONLY;

Invisible ColumnsCREATE TABLE tabela_teste( coluna1 NUMBER, coluna2 NUMBER, coluna3 NUMBER INVISIBLE, coluna4 NUMBER);

SQL> desc tabela_testeName ----------------------------------------- COLUNA1 NUMBERCOLUNA2 NUMBERCOLUNA4 NUMBER

Invisible Columns

INSERT INTO tabela_teste (coluna1,coluna2,coluna3,coluna4) VALUES (1,2,3,4);

INSERT INTO tabela_teste VALUES (1,2,4);

Invisible Columns

SET COLINVISIBLE ON

SQL> desc tabela_testeName ----------------------------------------- COLUNA1 NUMBERCOLUNA2 NUMBERCOLUNA4 NUMBERCOLUNA3 (INVISIBLE) NUMBER

Invisible Columns

ALTER TABLE tabela_teste MODIFY coluna3 VISIBLE;

SQL Text Expansion

SQL> variable retorno clobSQL> begin dbms_utility.expand_sql_text( input_sql_text => 'select * from emp', output_sql_text=> :retorno );end;

SQL Text Expansion

• Views• VPDs (Virtual Private Database)

PL/SQL From SQLwith function Is_Number (x in varchar2) return varchar2 is Plsql_Num_Error exception; pragma exception_init(Plsql_Num_Error, -06502); begin if (To_Number(x) is NOT null) then return 'Y'; else return ''; end if; exception when Plsql_Num_Error then return 'N'; end Is_Number;select rownum, x, is_number(x) is_num from t;

Session Level Sequences

Session level sequences are used to produce unique values in a session. Once the session ends, the sequence is reset. Generating Primary Keys for a Global Temporary Table would be a field where those kinds of sequences could be used.


CREATE SEQUENCE sequence_teste START WITH 1 INCREMENT BY 1 SESSION/


ALTER SEQUENCE sequence_testeSESSION;

ALTER SEQUENCE sequence_testeGLOBAL;

Extended Data Types

SQL> create table tabela_teste(campo01 varchar2(4001));*ERROR at line 1:ORA-00910: specified length too long for its datatype

Extended Data Types

- VARCHAR2 : 32767 bytes- NVARCHAR2 : 32767 bytes- RAW : 32767 bytes

Extended Data Types

SHUTDOWN IMMEDIATE;STARTUP UPGRADE;ALTER SYSTEM SET max_string_size=extended;@?/rdbms/admin/utl32k.sqlSHUTDOWN IMMEDIATE;STARTUP;

**Once you switch to extended data types you can't switch back

DDL LOGGING

DDL LOGGING

/u01/app/oracle/diag/rdbms/orcl/orcl/log/ddl/log.xml

Direct SQL statement execution in RMAN

Pre - 12c:RMAN> SQL ‘SELECT sysdate FROM dual’;

12c:RMAN> SELECT sysdate FROM dual;

RMAN Table Recovery in 12c

RMAN enables you to recover one or more tables or table partitions to a specified point in time.

RMAN Table Recovery in 12c

RMAN> RECOVER TABLE HR.REGIONS UNTIL TIME "TO_DATE('01/10/2013 09:33:39','DD/MM/RRRR HH24:MI:SS')"AUXILIARY DESTINATION '/tmp/backups'

Thank You

oracle database 12.1.0.2 new features

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