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
oraclefromguatemala.com.gt
@hdeiby
• President of Guatemala Oracle Users Group
• Youngest ACE in the World (23 years old)
• Youngest OCM 11g in Latin America (24 years old)
• Youngest ACE Director in the World (25 years old)
• Some Certs (Exadata, RAC, Linux, SOA)
• Consultant at Pythian

Alex Zaballa
http://alexzaballa.blogspot.com/
@alexzaballa
145 and counting…

Deiby 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 Clause
SELECT 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 Clone
IN 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: 12.1.0.2
Source: 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 Clone
Target: 12.1.0.1
Source: 12.1.0.1
sourcepdb@dblinktosource
*
ERROR at line 1:
ORA-17628: Oracle error 19505 returned by remote Oracle server
ORA-19505: failed to identify file ""

PDB Remote Clone
Target: 12.1.0.2
Source: 12.1.0.2
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

CDB Restart
1. Set the PDB at the State you want to save.
1. SQL> alter pluggable database pdb1 save state;
Pluggable database altered.
or
SQL> alter pluggable database pdb1 discard state;
12.1.0.2

CDB Restart
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 1
Tablespace 1
PDB 2
Tablespace 2
PDB 3
Tablespace 3

More Oracle Database 12.1.0.2 New Features
Alex 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/

Data Redaction
OTN Article in English by Alex Zaballa
http://www.oracle.com/technetwork/articles/d
atabase/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

SQL Query Row Limits
and Offsets

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);

and Offsets
Top-N Queries – Pré 12c
select * from ( select codigo, nome, salario
from tabela_teste
order by salario desc)
where rownum <= 5

and Offsets
select codigo, nome, salario
from tabela_teste
order by salario desc
FETCH FIRST 5 ROWS ONLY

and Offsets
from tabela_teste
order by salario
FETCH FIRST 30 PERCENT ROWS ONLY

and Offsets
from tabela_teste
order by salario desc
OFFSET 2 ROWS FETCH NEXT 2 ROWS ONLY;

Invisible Columns
CREATE TABLE tabela_teste
(
coluna1 NUMBER,
coluna2 NUMBER,
coluna3 NUMBER INVISIBLE,
coluna4 NUMBER
);
SQL> desc tabela_teste
Name
-----------------------------------------
COLUNA1 NUMBER
COLUNA2 NUMBER
COLUNA4 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_teste
Name
-----------------------------------------
COLUNA1 NUMBER
COLUNA2 NUMBER
COLUNA4 NUMBER
COLUNA3 (INVISIBLE) NUMBER

Invisible Columns
ALTER TABLE tabela_teste MODIFY coluna3 VISIBLE;

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

SQL Text Expansion
• Views
• VPDs

PL/SQL From SQL
with
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_teste
SESSION;
ALTER SEQUENCE sequence_teste
GLOBAL;

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.sql
SHUTDOWN IMMEDIATE;
STARTUP;
**Once you switch to extended data types you can't switch back

Multiple Indexes on the
same set of Columns
Pre 12c:
ORA-01408: such column list already indexed
error.

same set of Columns
Is the ability to create more than one index on
the same set of columns in 12c.
**Only one of these indexes can be visible at a
time

same set of Columns
Why would you want to do that?
• Unique versus nonunique
• B-tree versus bitmap
• Different partitioning strategies

READ Object Privilege and
READ ANY TABLE System Privilege
What is the difference to SELECT and SELECT
ANY TABLE?

SELECT and SELECT ANY TABLE provides the
ability to lock rows:
LOCK TABLE table_name IN EXCLUSIVE MODE;
SELECT ... FROM table_name FOR UPDATE;

SQL> grant select on scott.emp to teste;
Grant succeeded.
SQL> lock table scott.emp in exclusive mode;
Table(s) Locked.

SQL> grant read on scott.emp to teste;
Grant succeeded.
SQL> lock table scott.emp in exclusive mode;
lock table scott.emp in exclusive mode
*
ERROR at line 1:
ORA-01031: insufficient privileges

Truncate Cascade
SQL> truncate table scott.dept;
truncate table scott.dept
*
ERROR at line 1:
ORA-02266: unique/primary keys in table
referenced by enabled foreign keys

Truncate Cascade
SQL> truncate table scott.dept cascade;
Table truncated.
The constraint should be ON DELETE CASCADE.

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'

Statistics During Loads
The ability to gather statistics automatically
during bulk loads:
- CREATE TABLE AS SELECT
- INSERT INTO ... SELECT into an empty table
using a direct path insert

Partial Indexes for Partitioned Table
• You can create local and global indexes on a
subset of the partitions of a table, enabling
more flexibility in index creation.
• This feature is not supported for unique
indexes, or for indexes used for enforcing
unique constraints.

Partial Indexes for Partitioned Table

In-Database Archiving
SQL> create table tabela_teste(coluna1 number)
row archival;
insert into tabela_teste values(1);

update tabela_teste
set ora_archive_state=DBMS_ILM.ARCHIVESTATENAME(1)
where coluna1=3;

alter session set row archival visibility=all;

SQL*Loader Express
• You don't need to to write and test a
SQL*Loader control file.
• The benefit main is the savings for time and
effort.

SQL*Loader Express
[oracle@oracle01 tmp]$ cat EMPRESA.dat
1,Empresa 1
2,Empresa 2
3,Empresa 3
4,Empresa 4
5,Empresa 5
6,Empresa 6
7,Empresa 7
8,Empresa 8
9,Empresa 9

SQL*Loader Express
[oracle@oracle01 tmp]$ sqlldr teste/teste TABLE=EMPRESA
SQL*Loader: Release 12.1.0.1.0 - Production on Sat Jan 11 12:16:28 2014
Copyright (c) 1982, 2013, Oracle and/or its affiliates. All rights reserved.
Express Mode Load, Table: EMPRESA
Path used: External Table, DEGREE_OF_PARALLELISM=AUTO
Table EMPRESA:
9 Rows successfully loaded.
Check the log files:
EMPRESA.log
EMPRESA_%p.log_xt
for more information about the load.

Identity Columns
CREATE TABLE tabela_teste (
id NUMBER GENERATED ALWAYS AS IDENTITY,
coluna1 VARCHAR2(30)
);

Identity Columns
id NUMBER GENERATED BY DEFAULT AS IDENTITY,
);

Identity Columns
id NUMBER GENERATED BY DEFAULT ON NULL AS
IDENTITY,
);

Oracle Database 12.1.0.2 New Features

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