Oracle Database 12c R1/R2 New Features for 11g DBA(and Developer)!

@biju_thomas

Biju Thomas

Principal Solutions ArchitectOneNeck IT Solutionswww.OneNeck.com

OneNeck IT Solutions at a Glance Backed by Fortune 500 strength of Telephone and Data Systems Hybrid IT Nearly 550 employees 8 data centers in 6 states, Coast-to-coast presence

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About me!

Biju Thomas

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Principal Solutions Architect with OneNeck IT Solutions Over 20 years of Oracle Database development and administration expertise Over 10 years of Oracle E-Business Suite Architecture & Tuning expertise First book published in September 2000, seventh in 2015 DBA Website since 1997 www.bijoos.com Oracle ACE Director

http://www.bijoos.com/

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Learn features of Oracle Database 12c that are not top, but

would help you!

As a 11g DBA/Developer, what you should know when working

with 12c R1 or R2 database (changed behavior or additional

functionality).

Many features at a high level once you know what to look for,

googling always works! (have

Database 12.2 Features(Cloud Only)

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Automatic Password Propagation to Standby: Changing SYS password

Versions 12.1 and earlier Change password in primary

Copy password file from primary to standby sites

Version 12.2 Change password in primary

Automatically synched to all standby sites

One less thing to worry about!

Data Guard Password Sync 12.2

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A partition or sub-partition can be marked as READ ONLY at the time of creation (CREATE TABLE) or later (ALTER TABLE).

Specify key word READ ONLY.

READ WRITE is the default.

Example 1: (xxt is partitioned table)

ALTER TABLE xxt READ ONLY;

All current and future created partitions will be read only.

Example 2:

ALTER TABLE xxt MODIFY PARTITION xxt_p4 READ WRITE;

All partitions except xxt_p4 are read only.

Read Only Partitions 12.2

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In 12.1 and earlier, create the partitions and specify the values that fall in each partition. DEFAULT partition is used to catch all (similar to MAXVALUE in range).

New AUTOMATIC keyword in list partition. Oracle automatically creates a new partition for each distinct value in the partition column.

CREATE TABLE ab1 (s1 varchar2(2), d1 varchar2 (20))

PARTITION BY LIST (s1)

AUTOMATIC (PARTITION p_az VALUES ('AZ'));

ALTER TABLE xyz SET AUTOMATIC;

Notes An automatic list-partitioned table must have at least one partition when created.

Cannot have a DEFAULT partition.

Not supported at the sub-partition level.

Automatic List Partitions 12.2

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Modify a non-partitioned table to partitioned table, online!

alter table allsyn modify

partition by list (owner)

AUTOMATIC (partition p_sys values ('SYS')) ONLINE;

alter table allsyn modify

partition by list (owner)

AUTOMATIC (partition p_sys values ('SYS'))

update indexes (allsyn_I1 LOCAL) ONLINE;

In versions prior to 12.2, this activity required DBMS_REDEFINITION.

Convert to Partitioned Table Online! 12.2

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SQL*Plus command history available.

SET HIST[ORY] ON

SQL*Plus Notables 12.2

SET FEEDBACK ONLY

Returns just the number of rows returned by the query without displaying the query result.

SET MARKUP CSV

SET MARKUP command supports the display of data in CSV format. Produce output in HTML or CSV format.

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Undo local to each pluggable database default for newly created databases.

When local undo is enabled, each PDB has own undo tablespace.

SELECT property_name, property_value

FROM database_properties

WHERE property_name = 'LOCAL_UNDO_ENABLED';

To change Undo mode, outage required, and need the database in UPGRADE mode.

STARTUP UPGRADE;

ALTER DATABASE LOCAL UNDO ON/OFF;

Local Undo for Pluggable Databases

http://docs.oracle.com/database/122/ADMIN/administering-a-cdb-with-sql-plus.htm#ADMIN-GUID-8F8B2FF8-7FA7-40CD-8AA5-ACABCD3964D8

12.2

http://docs.oracle.com/database/122/ADMIN/administering-a-cdb-with-sql-plus.htm#ADMIN-GUID-8F8B2FF8-7FA7-40CD-8AA5-ACABCD3964D8

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A PDB lockdown profile is a named set of features that control operations available to users connected to a PDB.

New parameter PDB_LOCKDOWN

CREATE LOCKDOWN PROFILE medium;

ALTER LOCKDOWN PROFILE medium DISABLE STATEMENT=('ALTER

SYSTEM');

ALTER LOCKDOWN PROFILE medium ENABLE STATEMENT=('ALTER

SYSTEM') CLAUSE=('FLUSH SHARED POOL');

Creates a profile called medium that disables all ALTER SYSTEM statements except for ALTER SYSTEM FLUSH SHARED POOL.

Alter lockdown profile XP1 disable

statement=('ALTER SESSION') clause=('SET') OPTION

ALL EXCEPT=('sql_trace','optimizer_mode')

PDB Lockdown Profile

Reference: http://docs.oracle.com/database/122/CNCPT/overview-of-the-multitenant-architecture.htm#CNCPT-GUID-B964031E-8ACE-4603-8F1E-DD173BE5BA01

12.2

http://docs.oracle.com/database/122/CNCPT/overview-of-the-multitenant-architecture.htm#CNCPT-GUID-B964031E-8ACE-4603-8F1E-DD173BE5BA01

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New user profile resource: INACTIVE_ACCOUNT_TIME

Automatically locks the database user account who has not logged into the database instance in a specified number of days.

Inactive Account Lock 12.2

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In 12.1, maximum number of PDBs is 252

In 12.2 maximum number of PDBs is 4096

New parameter MAX_PDBS

In a single-tenant environment (if not licensed for multitenant), set this parameter to 1.

Maximum Number of PDBs 12.2

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The SYSRAC administrative privilege Uused by the Clusterware agent in its connection to the database on behalf of Oracle RAC

utilities, such as SRVCTL.

The SYSRAC privilege provides only the minimal privileges necessary for performing day-to-day Oracle RAC operations.

Initialization parameter ALLOW_GROUP_ACCESS_TO_SGA Determines if the Oracle Database installation owner account is the only user that can

read and write to the database System Global Area (SGA), or if members of the OSDBA group can read the SGA.

The default value for this parameter is FALSE.

The maximum length for most database object names has increased from 30 bytes to 128 bytes.

Local temporary tablespace Created using LOCAL TEMPORARY TABLESPACE clause of CREATE TABLESPACE.

In RAC environment, local temporary tablespaces store a separate, nonshared temp files for each database instance, which can improve I/O performance.

A local temporary tablespace must be a BIGFILE tablespace.

Few more 12.2 12.2

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