Oracle Active Data Guard 12c: Far Sync Instance, Real-Time Cascade and Other Goodies!

2014 © Trivadis

BASEL BERN BRUGG LAUSANNE ZUERICH DUESSELDORF FRANKFURT A.M. FREIBURG I.BR. HAMBURG MUNICH STUTTGART VIENNA

2014 © Trivadis

Data Guard 12c: Far Sync Instance,

Real-Time Cascade Standby and

other goodies Ludovico Caldara

Oracle ACE, Senior Consultant

Trivadis SA

02.10.2014

Oracle Active Data Guard 12c

1

2014 © Trivadis

About Ludovico Caldara

2

■ 14 Years DBA (started with 7.3.4)

▪ I do it everywhere (also on Windows)

■ RAC ATTACK Ninja & co-writer

■ RAC SIG Board member

■ OCP (11g, 12c, MySQL) & OCE

■ Italian Living in Switzerland

■ http://www.ludovicocaldara.net

■ @ludodba

■ ludovicocaldara

http://www.ludovicocaldara.net/

2014 © Trivadis

Trivadis is a market leader in IT consulting, system integration,

solution engineering and the provision of IT services focusing

on and technologies in Switzerland,

Germany and Austria.

We offer our services in the following strategic business fields:

Trivadis Services takes over the interacting operation of your IT systems.

O P E R A T I O N

About

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4

11 Trivadis branches and more than

600 employees

200 Service Level Agreements

Over 4,000 training participants

Research and development budget:

CHF 5.0 / EUR 4 million

Financially self-supporting and

sustainably profitable

Experience from more than 1,900

projects per year at over 800

customers

Hamburg

Düsseldorf

Frankfurt

Freiburg Munich

Vienna

Basel

Zurich Bern

Lausanne

4

Stuttgart

Over 600 specialists and IT experts in the DACH region

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AGENDA

1. Real-Time Cascade Standby

2. Far-Sync Instances

3. Other goodies ;-)

4. Q&A

02.10.2014


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02.10.2014


Real-Time Cascade Standby

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Cascade Standby

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PRIMARY CASCADING CASCADED

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Cascade Standby in 11gR2

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ARCH or LGWR

(SYNC, ASYNC)

ARCH

ONLY!!

Supported by

the broker Not possible with 11g

broker! Only manual

configuration of

LOG_ARCHIVE_DEST_n!

2014 © Trivadis

Cascade Standby in 12cR1

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SYNC, FASTSYNC or

ASYNC (LGWR)

ASYNC (LGWR)

<none> (ARCH)

Cascade now supported by

the 12c broker

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SYNC, FASTSYNC or

ASYNC (LGWR)

ASYNC (LGWR)

<none> (ARCH)


the 12c broker

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SYNC, FASTSYNC or

ASYNC (LGWR)

ASYNC (LGWR)

<none> (ARCH)


the 12c broker

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Cascade Standby Without Broker

12

PROD

DR

REP

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PROD

LOG_ARCHIVE_DEST_2=‘SERVICE=DR, SYNC AFFIRM

VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE)’

DR

REP

2014 © Trivadis


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PROD



DR

REP

LOG_ARCHIVE_DEST_2=‘SERVICE=REP, ASYNC NOAFFIRM

VALID_FOR=(STANDBY_LOGFILES, STANDBY_ROLE)’

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PROD



DR

REP



REAL-TIME CASCADE

AND ACTIVE DATA

GUARD

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PROD



DR

REP





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PROD



DR

REP



LOG_ARCHIVE_DEST_2=‘SERVICE=PROD, ASYNC NOAFFIRM

VALID_FOR=(STANDBY_LOGFILES,STANDBY_ROLE)’



2014 © Trivadis

Cascade Standby with 12cR1 Broker

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PROD

DR

REP

RedoRoutes=‘(LOCAL : DR)’

RedoRoutes=‘ (PROD : REP ASYNC) (REP : PROD ASYNC)

(LOCAL : REP , PROD)’

RedoRoutes=‘(LOCAL:DR)’

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PROD

DR

REP





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PROD

DR

REP





REAL-TIME CASCADE

AND ACTIVE DATA

GUARD

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Real-Time Cascade: Little demo?

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O12p01

PROD O12p02

DR

O12p03

REP

2014 © Trivadis

02.10.2014


Far-Sync Instances

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High distances = High latencies

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Too far to support SYNC

redo-transport

ASYNC ONLY!!

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Solution with 11gR2

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ASYNC REMOTE

SYNC

LOCAL

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Solution with 11gR2

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ASYNC REMOTE

SYNC

LOCAL

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Solution with 12cR1

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FAR_SYNC

Instance

SYNC

LOCAL

ASYNC

REMOTE

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Solution with 12cR1

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FAR_SYNC

Instance

SYNC

LOCAL

ASYNC

REMOTE

2014 © Trivadis

Solution with 12cR1

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FAR_SYNC

Instance

SYNC

LOCAL

ASYNC

REMOTE

2014 © Trivadis

Solution with 12cR1

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FAR_SYNC

Instance

SYNC

LOCAL

ASYNC

REMOTE

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FAR_SYNC instance characteristics

1. Special controlfile

ALTER DATABASE CREATE FAR SYNC INSTANCE CONTROLFILE;

2. NO datafiles and NO redo-apply

3. Standby logs are written and archived

4. The redo stream is redirected to the standby

5. Can’t be opened or converted to standby or primary

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One FAR_SYNC for each location

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SYNC

LOCAL

ASYNC

REMOTE FS_PROD

FS_DR PROD

DR REP

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One FAR_SYNC for each location

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SYNC

LOCAL

ASYNC

REMOTE

FS_PROD

FS_DR PROD

DR REP

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FAR_SYNC instances: Little demo?

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O12p01

PROD

O12p02

DR

O12p03

REP O12f01

PRODFS

O12f02

DRFS

2014 © Trivadis

02.10.2014


Other goodies ;-)

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2014 © Trivadis

FASTSYNC Log Transport Mode

1. table

2. No need to acknowledge the write on remote Standby Logs

3. Can be used with Maximum Availability

4. The commit overhead is due by the network only and not by the

remote disk latencies

LogXptMode Transport Acknowledge

SYNC SYNC AFFIRM

ASYNC ASYNC NOAFFIRM

FASTSYNC SYNC NOAFFIRM

02.10.2014


2014 © Trivadis

Temporary UNDO: GTTs for ADG!

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UNDO

TBS

TEMP

TBS

TEMP_UNDO_ENABLED = TRUE

GLOBAL

TEMPORARY

TABLE

DATA

TBS

SYSTEM

TBS

DATA &

UNDO

READ ONLY DATAFILES

2014 © Trivadis

Temporary UNDO: GTTs for ADG!

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UNDO

TBS

TEMP

TBS

TEMP_UNDO_ENABLED = TRUE

GLOBAL

TEMPORARY

TABLE

DATA

TBS

SYSTEM

TBS

DATA &

UNDO

READ ONLY DATAFILES

2014 © Trivadis

Sequence support

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ASKS FOR A SET OF

USABLE SEQUENCES

PRIMARY STANDBY

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Sequence support

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ASKS FOR A SET OF

USABLE SEQUENCES

PRIMARY STANDBY

2014 © Trivadis

Sequence support

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ASKS FOR A SET OF

USABLE SEQUENCES

PRIMARY STANDBY

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VALIDATE DATABASE

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DGMGRL> VALIDATE DATABASE ‘DR';

Database Role: Physical standby database

Primary Database: South_Sales

Ready for Switchover: Yes

Ready for Failover: Yes (Primary Running)

Flashback Database Status:

PROD: On

DR: Off

. . .

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VALIDATE DATABASE

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PROD: On

DR: Off

. . .

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VALIDATE DATABASE

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PROD: On

DR: Off

. . .

2014 © Trivadis

SQL Apply & Rolling Upgrades

1. SQL Apply enhanced:

Text, Multimedia, Spatial

Virtual columns

Securefiles with dedup.

2. New DBMS_ROLLING is simplifying rolling upgrades

Easy syntax and flow

Needs Active Data Guard Option (again )

02.10.2014


2014 © Trivadis

Other DataGuard improvements

1. New property ApplyLagThreshold raises a warning when the apply

lag is too high (useless with DelayMins parameter)

2. New property TransportLagThreshold raises a warning when the

transport lag is too high

3. New administrative privilege SYSDG (dgdba OS group)

02.10.2014


2014 © Trivadis

Two words about DG & Multitenant

1. Shared redo stream = The whole CDB has one role at time

2. No PDB granularity

3. All standby commands must be run into the root CDB

4. Creating PDB from seed is ok

5. Cloning PDBs depends on ADG

02.10.2014


2014 © Trivadis

Two words about Global Data Services

1. Evolution of Connection Manager

2. Slightly integrated with DG, GG, Advanced Replication

3. As of now, it works only when using Policy-Managed Clusters

4. Intelligent routing based on apply lag, region, workload

5. Requires ADG or GG licenses

02.10.2014


2014 © Trivadis

Questions and answers ...

2014 © Trivadis

BASEL BERN BRUGG LAUSANNE ZUERICH DUESSELDORF FRANKFURT A.M. FREIBURG I.BR. HAMBURG MUNICH STUTTGART VIENNA

Ludovico Caldara

Oracle ACE, Senior Oracle Consultant

[email protected]

@ludodba

02.10.2014


48

Technology

Oracle Active Data Guard 12c: Far Sync Instance, Real-Time Cascade and Other Goodies!