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BASEL BERN BRUGG DÜSSELDORF FRANKFURT A.M. FREIBURG I.BR. GENF
HAMBURG KOPENHAGEN LAUSANNE MÜNCHEN STUTTGART WIEN ZÜRICH
Get the Most out of Oracle Data Guard!
High Five POUG
#POUG2017
Ludovico Caldara
Oracle ACE Director
Senior Consultant
About Ludovico Caldara
Get the Most out of Oracle Data Guard!2 9/1/2017
■ 18 Years DBA (Not Only Oracle)
▪ I do it everywhere (even Windows)
■ RAC ATTACK Ninja & co-writer
■ President, SOUG & ITOUG Board
■ OCP (11g, 12c, MySQL) & OCE
■ Italian living in Switzerland
■ http://www.ludovicocaldara.net
■ @ludodba ludodba
■ ludovicocaldara
About Ludovico Caldara
Get the Most out of Oracle Data Guard!3 9/1/2017
■ 18 Years DBA (Not Only Oracle)
▪ I do it everywhere (even Windows)
■ RAC ATTACK Ninja & co-writer
■ President, SOUG & ITOUG Board
■ OCP (11g, 12c, MySQL) & OCE
■ Italian living in Switzerland
■ http://www.ludovicocaldara.net
■ @ludodba ludodba
■ ludovicocaldara
Our company.
Adaptive Features or: How I learned to Stop Worrying4 01/09/2017
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, Austria and Denmark.
We offer our services in the following strategic business fields:
Trivadis Services takes over the interactive operation of your IT systems.
O P E R A T I O N
COPENHAGEN
MUNICH
LAUSANNE
BERN
ZURICH
BRUGG
GENEVA
HAMBURG
DÜSSELDORF
FRANKFURT
STUTTGART
FREIBURG
BASEL
VIENNA
With over 600 specialists and IT experts in your region.
Adaptive Features or: How I learned to Stop Worrying5 01/09/2017
14 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
Get the Most out of Oracle Data Guard!6 9/1/2017
Oracle
Data Guard?
Why is Oracle Data Guard still relevant?
Get the Most out of Oracle Data Guard!7 9/1/2017
The best high availability solution in the Oracle ecosystem
– Synchronous (or not)
– One-to-one copy (or one-to-many)
– No single points of failure
– Failover is (almost) transparent to the applications (if well configured)
Rock solid!
Included in Oracle Database Enterprise Edition
Hey, it’s 12c Release 2!
Get the Most out of Oracle Data Guard!8 9/1/2017
Multiple Observers for Fast-Start Failover configurations
Observer in Background mode (needs wallet)
Recover of Nologging Operations (recover database nonlogged block;)
Multiple fast_start failover targets
Automated passwordfile copy
Enhanced Broker and dgmgrl
FastSync redo transport
Hey, it’s 12c Release 2!
Get the Most out of Oracle Data Guard!9 9/1/2017
Multiple Observers for Fast-Start Failover configurations
Observer in Background mode (needs wallet)
Recover of Nologging Operations (recover database nonlogged block;)
Multiple fast_start failover targets
Automated passwordfile copy
Enhanced Broker and dgmgrl
FastSync redo transport That was 12cR1!
What about Active Data Guard new features?
Get the Most out of Oracle Data Guard!10 9/1/2017
What about Active Data Guard new features?
Get the Most out of Oracle Data Guard!11 9/1/2017
What about Active Data Guard new features?
Get the Most out of Oracle Data Guard!12 9/1/2017
Get the Most out of Oracle Data Guard!13 9/1/2017
Technology Enablers
The «MAIN» features included in Data Guard
Get the Most out of Oracle Data Guard!14 9/1/2017
Client Failover (TAF)
Redo Apply
SQL Apply
Snapshot Standby
Rolling Upgrades (possible, but without RDBMS_ROLLING)
Transaction Guard (necessary for Application Continuity but not licensed as option)
The «MAIN» features included in Data Guard
Get the Most out of Oracle Data Guard!15 9/1/2017
Client Failover (TAF)
Redo Apply
SQL Apply
Snapshot Standby
Rolling Upgrades (possible, but without RDBMS_ROLLING)
Transaction Guard (necessary for Application Continuity but not licensed as option)
Our three main topics for this presentation
Get the Most out of Oracle Data Guard!16 9/1/2017
Client Failover (TAF)
Snapshot Standby
Standby consistency on recovery cancel
Our three main topics for this presentation
Get the Most out of Oracle Data Guard!17 9/1/2017
Client Failover (TAF)
Snapshot Standby
Standby consistency on recovery cancel
Database
Migration
Our three main topics for this presentation
Get the Most out of Oracle Data Guard!18 9/1/2017
Client Failover (TAF)
Snapshot Standby
Standby consistency on recovery cancel
Reporting
Our three topics focuses for this presentation
Get the Most out of Oracle Data Guard!19 9/1/2017
Client Failover (TAF)
Snapshot Standby
Standby consistency on recovery cancel Database
Cloning
Get the Most out of Oracle Data Guard!20 9/1/2017
Client Failover
Client Failover is a critical topic!
Get the Most out of Oracle Data Guard!21 9/1/2017
https://www.slideshare.net/ludovicocaldara/oracle-client-failover-under-the-hood
– OS Connect Timeouts/ARP Cache
– OS Re-Connect Timeouts
– Virtual IP Addresses
– TCP Keepalive
– Database Services
– DB Connect Timeouts
– DB Re-Connect Timeouts
– Transparent Application Failover
– Fast Application Notification / Fast Connection Failover
– Application Continuity
Database Services
Get the Most out of Oracle Data Guard!
Database services can be created with:
– srvctl (Grid Infrastructure), gdsctl (Global Data Services).
– dbms_service.create_service() PL/SQL procedure (TRIGGER AFTER STARTUP!)
Different high availability and workload management attributes can be defined
Service
srvctl add service
-db <db_unique_name>
-service <service>
-preferred "<preferred_list>"
-available "<available_list>"
-serverpool <pool_name>
-cardinality [UNIFORM | SINGLETON]
-tafpolicy [NONE | BASIC | PRECONNECT]
-role [PRIMARY, PHYSICAL_STANDBY, LOGICAL_STANDBY, SNAPSHOT_STANDBY]
-clbgoal [SHORT | LONG]
-rlbgoal [SERVICE_TIME | THROUGHPUT | NONE]
...
Not available with
Oracle Restart
9/1/201722
Role-Based Services
Get the Most out of Oracle Data Guard!
Example role-based services with Grid Infrastructure.
Services are started, only if database and service role match.
srvctl add service -db sour_poug –service sour_rw.trivadis.com 
-role PRIMARY
srvctl add service -db sour_poug -service sour_ro.trivadis.com 
-role PHYSICAL_STANDBY
srvctl add service -db sour_poug -service sour_snap.trivadis.com 
-role SNAPSHOT_STANDBY
SvcAgent::start 680 query_db_role
SvcAgent::start 710 not starting service sour_rw Role mismatch -
Service role:PRIMARY, current DB role:PHYSICAL_STANDBY
9/1/201723
Transparent Application Failover – Server Side Example
Get the Most out of Oracle Data Guard!
Example server side TAF BASIC method configuration.
srvctl add service
-db sour_SITE1
-service sour_RW
-tafpolicy BASIC
-failovertype SELECT
-failoverdelay 1
-failoverretry 180
9/1/201724
BEGIN
DBMS_SERVICE.CREATE_SERVICE (
service_name => 'sour.TRIVADIS.COM',
network_name => 'sour.TRIVADIS.COM',
failover_method => 'BASIC',
failover_type => 'SELECT',
failover_retries => 180,
failover_delay => 3);
END;
/
Transparent Application Failover – Client Side Example
Get the Most out of Oracle Data Guard!
Example client side TAF BASIC method configuration.
189/1/201725
sour.trivadis.com =
(DESCRIPTION =
(FAILOVER=ON) (LOAD_BALANCE=OFF)
(CONNECT_TIMEOUT=5)(RETRY_COUNT=3)(RETRY_DELAY=1)(TRANSPORT_CONNECT_TIMEOUT=3)
(ADDRESS_LIST= (ADDRESS=(PROTOCOL=TCP)(HOST=ludo01.trivadis.com)(PORT=1521))
(ADDRESS=(PROTOCOL=TCP)(HOST=vico01.trivadis.com)(PORT=1521)))
(CONNECT_DATA =
(SERVICE_NAME = sour.trivadis.com)
(FAILOVER_MODE =
(TYPE = SESSION)
(METHOD = BASIC)
(RETRIES = 180)
(DELAY = 1)
)
)
)
Transparent Application Failover – Client Side Example
Get the Most out of Oracle Data Guard!
Example client side TAF BASIC method configuration.
189/1/201726
sour.trivadis.com =
(DESCRIPTION =
(FAILOVER=ON) (LOAD_BALANCE=OFF)
(CONNECT_TIMEOUT=5)(RETRY_COUNT=3)(RETRY_DELAY=1)(TRANSPORT_CONNECT_TIMEOUT=3)
(ADDRESS_LIST= (ADDRESS=(PROTOCOL=TCP)(HOST=ludo01.trivadis.com)(PORT=1521))
(ADDRESS=(PROTOCOL=TCP)(HOST=vico01.trivadis.com)(PORT=1521)))
(CONNECT_DATA =
(SERVICE_NAME = sour.trivadis.com)
(FAILOVER_MODE =
(TYPE = SESSION)
(METHOD = BASIC)
(RETRIES = 180)
(DELAY = 1)
)
)
)
!
TAF is for OCI Drivers only
Thin Driver: do not use TAF
Use Case: Classic Data Guard Failover / Switchover
Get the Most out of Oracle Data Guard!27 9/1/2017
sour_ludo sour_vico
sour_RW
CLIENTS
srvctl add service -db sour_vico
-service sour_RW
-role PRIMARY
(ADDRESS=(HOST=ludo01)(PORT=1521))
(ADDRESS=(HOST=vico01)(PORT=1521))
MRP0
Use Case: Classic Data Guard Failover / Switchover
Get the Most out of Oracle Data Guard!28 9/1/2017
sour_ludo sour_vico
sour_RW
CLIENTS
srvctl add service -db sour_vico
-service sour_RW
-role PRIMARY
(ADDRESS=(HOST=ludo01)(PORT=1521))
(ADDRESS=(HOST=vico01)(PORT=1521))
MRP0
Use Case: Migrate Standalone on another server
Get the Most out of Oracle Data Guard!29 9/1/2017
sour
CLIENTS
(ADDRESS=(HOST=ludo01)(PORT=1521))
Use Case: Migrate Standalone on another server
Get the Most out of Oracle Data Guard!30 9/1/2017
sour
CLIENTS
(ADDRESS=(HOST=ludo01)(PORT=1521))
sour_newMRP0
– Set up Standby instance
Use Case: Migrate Standalone on another server
Get the Most out of Oracle Data Guard!31 9/1/2017
sour
CLIENTS
(ADDRESS=(HOST=ludo01)(PORT=1521))
sour_newMRP0
– Set up Standby instance
– Stop application
Use Case: Migrate Standalone on another server
Get the Most out of Oracle Data Guard!32 9/1/2017
sour
CLIENTS
(ADDRESS=(HOST=ludo01)(PORT=1521))
sour_new
MRP0
– Set up Standby instance
– Stop application
– Switchover
Use Case: Migrate Standalone on another server
Get the Most out of Oracle Data Guard!33 9/1/2017
sour
CLIENTS
(ADDRESS=(HOST=ludo01vico01)(PORT=1521))
sour_new
MRP0
– Change TNS definition– Set up Standby instance
– Stop application
– Switchover
Use Case: Migrate Standalone on another server
Get the Most out of Oracle Data Guard!34 9/1/2017
sour
CLIENTS
(ADDRESS=(HOST=ludo01vico01)(PORT=1521))
sour_new
MRP0
– Change TNS definition
– Start application
– Set up Standby instance
– Stop application
– Switchover
Use Case: Migrate Standalone on another server
Get the Most out of Oracle Data Guard!35 9/1/2017
CLIENTS
(ADDRESS=(HOST=vico01)(PORT=1521))
sour_new
– Set up Standby instance
– Stop application
– Switchover
– Change TNS definition
– Start application
– Cleanup
Use Case: Migrate Standalone on another server
Get the Most out of Oracle Data Guard!36 9/1/2017
Problems
– Requires application downtime (even if short)
– Messy DB_UNIQUE_NAME naming convention
Use Case: Migrate Standalone on another server
Get the Most out of Oracle Data Guard!37 9/1/2017
Problems
– Requires application downtime (even if short)
– Messy DB_UNIQUE_NAME naming convention
?Better solutions?
Use Case: Migrate Standalone on another server
Get the Most out of Oracle Data Guard!38 9/1/2017
Problems
– Requires application downtime (even if short)
– Messy DB_UNIQUE_NAME naming convention
(ADDRESS=(HOST=ludo01)(PORT=1521))
(ADDRESS=(HOST=ludo01)(PORT=1521))
?Better solutions?
Hint: this is valid
Use Case: Smart Standalone Configuration
Get the Most out of Oracle Data Guard!39 9/1/2017
sour_ludo
CLIENTS
(ADDRESS=(HOST=sour-s1)(PORT=1521))
(ADDRESS=(HOST=sour-s2)(PORT=1521))
sour_RW
sour-s1 IN CNAME ludo01
sour-s2 IN CNAME ludo01
Use Case: Smart Standalone Configuration
Get the Most out of Oracle Data Guard!40 9/1/2017
sour_ludo
CLIENTS
(ADDRESS=(HOST=sour-s1)(PORT=1521))
(ADDRESS=(HOST=sour-s2)(PORT=1521))
sour_RW
sour-s1 IN CNAME ludo01
sour-s2 IN CNAME ludo01
sour_vicoMRP0
Use Case: Smart Standalone Configuration
Get the Most out of Oracle Data Guard!41 9/1/2017
sour_ludo
CLIENTS
(ADDRESS=(HOST=sour-s1)(PORT=1521))
(ADDRESS=(HOST=sour-s2)(PORT=1521))
sour_RW
sour-s1 IN CNAME ludo01
sour-s2 IN CNAME vico01
sour_vicoMRP0
Use Case: Smart Standalone Configuration
Get the Most out of Oracle Data Guard!42 9/1/2017
sour_ludo
CLIENTS
(ADDRESS=(HOST=sour-s1)(PORT=1521))
(ADDRESS=(HOST=sour-s2)(PORT=1521))
sour_RW
sour-s1 IN CNAME ludo01
sour-s2 IN CNAME vico01
sour_vicoMRP0
TAF!
Use Case: Smart Standalone Configuration
Get the Most out of Oracle Data Guard!43 9/1/2017
sour_ludo
CLIENTS
(ADDRESS=(HOST=sour-s1)(PORT=1521))
(ADDRESS=(HOST=sour-s2)(PORT=1521))
sour_RW
sour-s1 IN CNAME vico01
sour-s2 IN CNAME vico01
sour_vicoMRP0
TAF!
Use Case: Smart Standalone Configuration
Get the Most out of Oracle Data Guard!44 9/1/2017
CLIENTS
(ADDRESS=(HOST=sour-s1)(PORT=1521))
(ADDRESS=(HOST=sour-s2)(PORT=1521))
sour_RW
sour-s1 IN CNAME vico01
sour-s2 IN CNAME vico01
sour_vico
TAF!
Use Case: Smart Standalone Configuration
Get the Most out of Oracle Data Guard!45 9/1/2017
CLIENTS
(ADDRESS=(HOST=sour-s1)(PORT=1521))
(ADDRESS=(HOST=sour-s2)(PORT=1521))
sour_RW
sour-s1 IN CNAME vico01
sour-s2 IN CNAME vico01
sour_vico
TAF!
Get the Most out of Oracle Data Guard!46 9/1/2017
Live
Demo?
Get the Most out of Oracle Data Guard!47 9/1/2017
Snapshot Standby
Physical Standby (simplified)
Get the Most out of Oracle Data Guard!48 9/1/2017
stout_ludo stout_vicoLGWR RFS MRP0
ol stbl
arcarc
Snapshot Standby (simplified)
Get the Most out of Oracle Data Guard!49 9/1/2017
stout_ludo stout_vicoLGWR RFS
ol stbl
arcarc
LGWR
ol
arc
Snapshot Standby
Get the Most out of Oracle Data Guard!50 9/1/2017
Requirements
– Correct Data Guard configuration with a physical standby
– Physical standby has Fast Recovery Area Configured
– FORCE LOGGING is not mandatory but simplifies everything
Conversion to Snapshot Standby without broker
– ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL;
– ALTER DATABASE CONVERT TO SNAPSHOT STANDBY;
– ALTER DATABASE OPEN READ WRITE;
Conversion to Snapshot standby with broker
– CONVERT DATABASE <name> TO SNAPSHOT STANDBY;
Conversion
Get the Most out of Oracle Data Guard!51 9/1/2017
Stop Redo Apply
Create Guaranteed Restore Point
Flush Standby Logs
Clear Online Logfiles
Convert to Primary
Open resetlogs
Start RFS process to get redo stream from the primary
Two sources for Archive Logs?
Get the Most out of Oracle Data Guard!52 9/1/2017
SQL> select THREAD#, SEQUENCE#, RESETLOGS_ID, FIRST_CHANGE#, NEXT_CHANGE#, REGISTRAR,
ACTIVATION# from v$archived_log WHERE next_time>(sysdate-1/24);
THREAD# SEQUENCE# RESETLOGS_ID FIRST_CHANGE# NEXT_CHANGE# REGISTR ACTIVATION#
---------- ---------- ------------ ------------- ------------ ------- -----------
1 22 952446304 648113 652296 RFS 3044612576
1 23 952446304 652296 652300 RFS 3044612576
1 24 952446304 652300 652361 RFS 3044612576
1 25 952446304 652361 652404 RFS 3044612576
1 26 952446304 652404 652410 RFS 3044612576
1 27 952446304 652410 653523 RFS 3044612576
1 28 952446304 653523 653529 RFS 3044612576
1 29 952446304 653529 657362 RFS 3044612576
1 30 952446304 657362 657399 RFS 3044612576
1 31 952446304 657399 657461 RFS 3044612576
1 32 952446304 657461 661863 RFS 3044612576
1 33 952446304 661863 661869 RFS 3044612576
1 34 952446304 661869 662080 RFS 3044612576
1 1 952543943 661845 662731 ARCH 3044656145
Use Case: SNAP STANDBY ONLY
Get the Most out of Oracle Data Guard!53 9/1/2017
stout_ludo stout_vico
stout_RW stout_SNAP
CLIENTS
srvctl add service -db stout_vico
-service stout_SNAP
-role SNAPSHOT_STANDBY
(ADDRESS=(HOST=vico01)(PORT=1521))
(ADDRESS=(HOST=ludo01)(PORT=1521))
Use Case: SNAP STANDBY ONLY
Get the Most out of Oracle Data Guard!54 9/1/2017
stout_ludo stout_vico
stout_RW stout_SNAP
CLIENTS
srvctl add service -db stout_vico
-service stout_SNAP
-role SNAPSHOT_STANDBY
(ADDRESS=(HOST=vico01)(PORT=1521))
(ADDRESS=(HOST=ludo01)(PORT=1521))
MRP0
Use Case: SNAP STANDBY ONLY
Get the Most out of Oracle Data Guard!55 9/1/2017
srvctl add service -db stout_vico -service stout_snap.trivadistraining.com -role
“SNAPSHOT_STANDBY” -failovertype SELECT -failovermethod BASIC
stout_SNAP.trivadistraining.com =
(DESCRIPTION =
(CONNECT_TIMEOUT = 5 )(TRANSPORT_CONNECT_TIMEOUT = 3 )
(ADDRESS_LIST =
(LOAD_BALANCE = OFF )
(ADDRESS = (PROTOCOL = TCP )(HOST = vico01.trivadistraining.com )(PORT = 1521 ))
(ADDRESS = (PROTOCOL = TCP )(HOST = ludo01.trivadistraining.com )(PORT = 1521 ))
)
(CONNECT_DATA =
(SERVICE_NAME = stout_SNAP.trivadistraining.com )
)
)
Use Case: SNAP STANDBY or PRIMARY
Get the Most out of Oracle Data Guard!56 9/1/2017
stout_ludo stout_vico
stout_RW stout_SNAP
CLIENTS
srvctl add service -db stout_vico
-service stout_SNAP
-role “SNAPSHOT_STANDBY,PRIMARY”
(ADDRESS=(HOST=vico01)(PORT=1521))
(ADDRESS=(HOST=ludo01)(PORT=1521))
stout_SNAP
Use Case: SNAP STANDBY or PRIMARY
Get the Most out of Oracle Data Guard!57 9/1/2017
stout_ludo stout_vico
stout_RW stout_SNAP
CLIENTS
srvctl add service -db stout_vico
-service stout_SNAP
-role “SNAPSHOT_STANDBY,PRIMARY”
(ADDRESS=(HOST=vico01)(PORT=1521))
(ADDRESS=(HOST=ludo01)(PORT=1521))
stout_SNAP
MRP0
Use Case: SNAP STANDBY or PRIMARY
Get the Most out of Oracle Data Guard!58 9/1/2017
srvctl add service -db stout_vico -service stout_snap.trivadistraining.com -role
“PRIMARY,SNAPSHOT_STANDBY” -failovertype SELECT -failovermethod BASIC
stout_SNAP.trivadistraining.com =
(DESCRIPTION =
(CONNECT_TIMEOUT = 5 )(TRANSPORT_CONNECT_TIMEOUT = 3 )
(ADDRESS_LIST =
(LOAD_BALANCE = OFF )
(ADDRESS = (PROTOCOL = TCP )(HOST = vico01.trivadistraining.com )(PORT = 1521 ))
(ADDRESS = (PROTOCOL = TCP )(HOST = ludo01.trivadistraining.com )(PORT = 1521 ))
)
(CONNECT_DATA =
(SERVICE_NAME = stout_SNAP.trivadistraining.com )
)
)
Get the Most out of Oracle Data Guard!59 9/1/2017
Live
Demo?
Use Case: Double SNAP STANDBY
Get the Most out of Oracle Data Guard!60 9/1/2017
stout_ludo
stout_vico
stout_RW
stout_SNAP
CLIENTS
srvctl add service -db stout_vico
-service stout_SNAP
-role “SNAPSHOT_STANDBY”
(ADDRESS=(HOST=vico01)(PORT=1521))
(ADDRESS=(HOST=piwo01)(PORT=1521))
stout_piwoMRP0
Use Case: Double SNAP STANDBY
Get the Most out of Oracle Data Guard!61 9/1/2017
stout_ludo
stout_vico
stout_RW
stout_SNAP
CLIENTS
srvctl add service -db stout_vico
-service stout_SNAP
-role “SNAPSHOT_STANDBY”
(ADDRESS=(HOST=vico01)(PORT=1521))
(ADDRESS=(HOST=piwo01)(PORT=1521))
stout_piwo
stout_SNAP
Use Case: Double SNAP STANDBY
Get the Most out of Oracle Data Guard!62 9/1/2017
stout_ludo
stout_vico
stout_RW
CLIENTS
srvctl add service -db stout_vico
-service stout_SNAP
-role “SNAPSHOT_STANDBY”
(ADDRESS=(HOST=vico01)(PORT=1521))
(ADDRESS=(HOST=piwo01)(PORT=1521))
stout_piwo
MRP0
stout_SNAP
Two Standby Databases Use Case
Get the Most out of Oracle Data Guard!63 9/1/2017
srvctl add service -db stout_vico -service stout_snap.trivadistraining.com -role
“SNAPSHOT_STANDBY” -failovertype SELECT -failovermethod BASIC
stout_SNAP.trivadistraining.com =
(DESCRIPTION =
(CONNECT_TIMEOUT = 5 )(TRANSPORT_CONNECT_TIMEOUT = 3 )
(ADDRESS_LIST =
(LOAD_BALANCE = OFF )
(ADDRESS = (PROTOCOL = TCP )(HOST = vico01.trivadistraining.com )(PORT = 1521 ))
(ADDRESS = (PROTOCOL = TCP )(HOST = piwo01.trivadistraining.com )(PORT = 1521 ))
)
(CONNECT_DATA =
(SERVICE_NAME = stout_SNAP.trivadistraining.com )
)
)
Get the Most out of Oracle Data Guard!
Standby
Consistency
on
recovery cancel
9/1/201764
stout_vico
Redo Apply (roll-forward)
Get the Most out of Oracle Data Guard!65 9/1/2017
BUFFER CACHE
datafilesfuzzy
datafiles
dbw0
stout_ludo LGWR RFS MRP0
ol stbl
arcarc
ckpt
Block status
Get the Most out of Oracle Data Guard!66 9/1/2017
SQL> select status, dirty, count(*) from v$bh
2> group by status, dirty order by status, dirty;
STATUS D COUNT(*)
---------- - ----------
free N 11
mrec N 3013
mrec Y 82
DGMGRL> edit database stout_vico set state='APPLY-OFF';
SQL> select status, dirty, count(*) from v$bh
2> group by status, dirty order by status, dirty;
STATUS D COUNT(*)
---------- - ----------
free N 7012
Block status
Get the Most out of Oracle Data Guard!67 9/1/2017
SQL> select status, dirty, count(*) from v$bh
2> group by status, dirty order by status, dirty;
STATUS D COUNT(*)
---------- - ----------
free N 11
mrec N 3013
mrec Y 82
DGMGRL> edit database stout_vico set state='APPLY-OFF';
SQL> select status, dirty, count(*) from v$bh
2> group by status, dirty order by status, dirty;
STATUS D COUNT(*)
---------- - ----------
free N 7012
ORA-16037: user requested cancel of managed recovery operation
Managed Standby Recovery not using Real Time Apply
Recovery interrupted!
Recovered data files to a consistent state at change 292504638291
Consistent datafiles == consistent database
Get the Most out of Oracle Data Guard!68 9/1/2017
No additional media recovery required before OPEN RESETLOGS
– Cold backups via filesystem commands
– Cloning possible without bother with Online or Archive Logs!
Consistent Standby + ACFS Snapshots (or other) = Cheap Database Cloning
Cloning solution based on Standby Database
Get the Most out of Oracle Data Guard!69 9/1/2017
ludo01
GRID INFRASTRUCTURE 12cR2
DG +DATA
ACFS
/u02/fra
ACFS
/u02/data
stout_ludo
SNAPSHOT
stout
vico01
GRID INFRASTRUCTURE 12cR2
DG +DATA
ACFS
/u02/data
ACFS
/u02/fra
stout_vico
SNAPSHOT
stout
MRP0
SNAPSHOT
clone1
clone1
SNAPSHOT
COPYSNAPSHOT
COPYSNAPSHOT
COPYSNAPSHOT
COPYSNAPSHOT
COPYSNAPSHOT
COPYSNAPSHOT
Sunday
Cloning Steps
Get the Most out of Oracle Data Guard!70 9/1/2017
Snapshot creation
– edit database stout_vico set state=‘APPLY-OFF’;
– acfsutil snap create -w -p stout stout.`date +%A` /u02/data
– alter database backup controlfile to trace as ‘/u02/data/.ACFS/snaps/…’ ;
– create pfile=‘/u02/data/.ACFS/snaps/…’ from spfile;
– edit database stout_vico set state=‘APPLY-ON’;
Cloning Steps
Get the Most out of Oracle Data Guard!71 9/1/2017
Cloning the database from the snapshot
– Abort previous instance / delete previous snapshot
– acfsutil snap create -w -p stout.`date +%A` clone1 /u02/data
– sed -i -e ‘s/stout_vico/clones/g’ init.ora control_trace.trc
– startup open resetlogs
Get the Most out of Oracle Data Guard!72 9/1/2017
Live
Demo?
Get the Most out of Oracle Data Guard!73 9/1/2017
Let me do one more example
Database reorganization live
Get the Most out of Oracle Data Guard!74 9/1/2017
Setup physical standby
Convert to logical standby << Here the standby is OPEN
Stop SQL Apply
Reorganize your database
Start SQL Apply and catch the primary
Switchover to Logical Standby
Get the Most out of Oracle Data Guard!
Conclusions
9/1/201775
BASEL BERN BRUGG DÜSSELDORF FRANKFURT A.M. FREIBURG I.BR. GENF
HAMBURG KOPENHAGEN LAUSANNE MÜNCHEN STUTTGART WIEN ZÜRICH
Questions in front of a beer!
High Five POUG
#POUG2017
Ludovico Caldara
Oracle ACE Director
Senior Consultant

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Get the most out of Oracle Data Guard - POUG version

  • 1. BASEL BERN BRUGG DÜSSELDORF FRANKFURT A.M. FREIBURG I.BR. GENF HAMBURG KOPENHAGEN LAUSANNE MÜNCHEN STUTTGART WIEN ZÜRICH Get the Most out of Oracle Data Guard! High Five POUG #POUG2017 Ludovico Caldara Oracle ACE Director Senior Consultant
  • 2. About Ludovico Caldara Get the Most out of Oracle Data Guard!2 9/1/2017 ■ 18 Years DBA (Not Only Oracle) ▪ I do it everywhere (even Windows) ■ RAC ATTACK Ninja & co-writer ■ President, SOUG & ITOUG Board ■ OCP (11g, 12c, MySQL) & OCE ■ Italian living in Switzerland ■ http://www.ludovicocaldara.net ■ @ludodba ludodba ■ ludovicocaldara
  • 3. About Ludovico Caldara Get the Most out of Oracle Data Guard!3 9/1/2017 ■ 18 Years DBA (Not Only Oracle) ▪ I do it everywhere (even Windows) ■ RAC ATTACK Ninja & co-writer ■ President, SOUG & ITOUG Board ■ OCP (11g, 12c, MySQL) & OCE ■ Italian living in Switzerland ■ http://www.ludovicocaldara.net ■ @ludodba ludodba ■ ludovicocaldara
  • 4. Our company. Adaptive Features or: How I learned to Stop Worrying4 01/09/2017 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, Austria and Denmark. We offer our services in the following strategic business fields: Trivadis Services takes over the interactive operation of your IT systems. O P E R A T I O N
  • 5. COPENHAGEN MUNICH LAUSANNE BERN ZURICH BRUGG GENEVA HAMBURG DÜSSELDORF FRANKFURT STUTTGART FREIBURG BASEL VIENNA With over 600 specialists and IT experts in your region. Adaptive Features or: How I learned to Stop Worrying5 01/09/2017 14 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
  • 6. Get the Most out of Oracle Data Guard!6 9/1/2017 Oracle Data Guard?
  • 7. Why is Oracle Data Guard still relevant? Get the Most out of Oracle Data Guard!7 9/1/2017 The best high availability solution in the Oracle ecosystem – Synchronous (or not) – One-to-one copy (or one-to-many) – No single points of failure – Failover is (almost) transparent to the applications (if well configured) Rock solid! Included in Oracle Database Enterprise Edition
  • 8. Hey, it’s 12c Release 2! Get the Most out of Oracle Data Guard!8 9/1/2017 Multiple Observers for Fast-Start Failover configurations Observer in Background mode (needs wallet) Recover of Nologging Operations (recover database nonlogged block;) Multiple fast_start failover targets Automated passwordfile copy Enhanced Broker and dgmgrl FastSync redo transport
  • 9. Hey, it’s 12c Release 2! Get the Most out of Oracle Data Guard!9 9/1/2017 Multiple Observers for Fast-Start Failover configurations Observer in Background mode (needs wallet) Recover of Nologging Operations (recover database nonlogged block;) Multiple fast_start failover targets Automated passwordfile copy Enhanced Broker and dgmgrl FastSync redo transport That was 12cR1!
  • 10. What about Active Data Guard new features? Get the Most out of Oracle Data Guard!10 9/1/2017
  • 11. What about Active Data Guard new features? Get the Most out of Oracle Data Guard!11 9/1/2017
  • 12. What about Active Data Guard new features? Get the Most out of Oracle Data Guard!12 9/1/2017
  • 13. Get the Most out of Oracle Data Guard!13 9/1/2017 Technology Enablers
  • 14. The «MAIN» features included in Data Guard Get the Most out of Oracle Data Guard!14 9/1/2017 Client Failover (TAF) Redo Apply SQL Apply Snapshot Standby Rolling Upgrades (possible, but without RDBMS_ROLLING) Transaction Guard (necessary for Application Continuity but not licensed as option)
  • 15. The «MAIN» features included in Data Guard Get the Most out of Oracle Data Guard!15 9/1/2017 Client Failover (TAF) Redo Apply SQL Apply Snapshot Standby Rolling Upgrades (possible, but without RDBMS_ROLLING) Transaction Guard (necessary for Application Continuity but not licensed as option)
  • 16. Our three main topics for this presentation Get the Most out of Oracle Data Guard!16 9/1/2017 Client Failover (TAF) Snapshot Standby Standby consistency on recovery cancel
  • 17. Our three main topics for this presentation Get the Most out of Oracle Data Guard!17 9/1/2017 Client Failover (TAF) Snapshot Standby Standby consistency on recovery cancel Database Migration
  • 18. Our three main topics for this presentation Get the Most out of Oracle Data Guard!18 9/1/2017 Client Failover (TAF) Snapshot Standby Standby consistency on recovery cancel Reporting
  • 19. Our three topics focuses for this presentation Get the Most out of Oracle Data Guard!19 9/1/2017 Client Failover (TAF) Snapshot Standby Standby consistency on recovery cancel Database Cloning
  • 20. Get the Most out of Oracle Data Guard!20 9/1/2017 Client Failover
  • 21. Client Failover is a critical topic! Get the Most out of Oracle Data Guard!21 9/1/2017 https://www.slideshare.net/ludovicocaldara/oracle-client-failover-under-the-hood – OS Connect Timeouts/ARP Cache – OS Re-Connect Timeouts – Virtual IP Addresses – TCP Keepalive – Database Services – DB Connect Timeouts – DB Re-Connect Timeouts – Transparent Application Failover – Fast Application Notification / Fast Connection Failover – Application Continuity
  • 22. Database Services Get the Most out of Oracle Data Guard! Database services can be created with: – srvctl (Grid Infrastructure), gdsctl (Global Data Services). – dbms_service.create_service() PL/SQL procedure (TRIGGER AFTER STARTUP!) Different high availability and workload management attributes can be defined Service srvctl add service -db <db_unique_name> -service <service> -preferred "<preferred_list>" -available "<available_list>" -serverpool <pool_name> -cardinality [UNIFORM | SINGLETON] -tafpolicy [NONE | BASIC | PRECONNECT] -role [PRIMARY, PHYSICAL_STANDBY, LOGICAL_STANDBY, SNAPSHOT_STANDBY] -clbgoal [SHORT | LONG] -rlbgoal [SERVICE_TIME | THROUGHPUT | NONE] ... Not available with Oracle Restart 9/1/201722
  • 23. Role-Based Services Get the Most out of Oracle Data Guard! Example role-based services with Grid Infrastructure. Services are started, only if database and service role match. srvctl add service -db sour_poug –service sour_rw.trivadis.com -role PRIMARY srvctl add service -db sour_poug -service sour_ro.trivadis.com -role PHYSICAL_STANDBY srvctl add service -db sour_poug -service sour_snap.trivadis.com -role SNAPSHOT_STANDBY SvcAgent::start 680 query_db_role SvcAgent::start 710 not starting service sour_rw Role mismatch - Service role:PRIMARY, current DB role:PHYSICAL_STANDBY 9/1/201723
  • 24. Transparent Application Failover – Server Side Example Get the Most out of Oracle Data Guard! Example server side TAF BASIC method configuration. srvctl add service -db sour_SITE1 -service sour_RW -tafpolicy BASIC -failovertype SELECT -failoverdelay 1 -failoverretry 180 9/1/201724 BEGIN DBMS_SERVICE.CREATE_SERVICE ( service_name => 'sour.TRIVADIS.COM', network_name => 'sour.TRIVADIS.COM', failover_method => 'BASIC', failover_type => 'SELECT', failover_retries => 180, failover_delay => 3); END; /
  • 25. Transparent Application Failover – Client Side Example Get the Most out of Oracle Data Guard! Example client side TAF BASIC method configuration. 189/1/201725 sour.trivadis.com = (DESCRIPTION = (FAILOVER=ON) (LOAD_BALANCE=OFF) (CONNECT_TIMEOUT=5)(RETRY_COUNT=3)(RETRY_DELAY=1)(TRANSPORT_CONNECT_TIMEOUT=3) (ADDRESS_LIST= (ADDRESS=(PROTOCOL=TCP)(HOST=ludo01.trivadis.com)(PORT=1521)) (ADDRESS=(PROTOCOL=TCP)(HOST=vico01.trivadis.com)(PORT=1521))) (CONNECT_DATA = (SERVICE_NAME = sour.trivadis.com) (FAILOVER_MODE = (TYPE = SESSION) (METHOD = BASIC) (RETRIES = 180) (DELAY = 1) ) ) )
  • 26. Transparent Application Failover – Client Side Example Get the Most out of Oracle Data Guard! Example client side TAF BASIC method configuration. 189/1/201726 sour.trivadis.com = (DESCRIPTION = (FAILOVER=ON) (LOAD_BALANCE=OFF) (CONNECT_TIMEOUT=5)(RETRY_COUNT=3)(RETRY_DELAY=1)(TRANSPORT_CONNECT_TIMEOUT=3) (ADDRESS_LIST= (ADDRESS=(PROTOCOL=TCP)(HOST=ludo01.trivadis.com)(PORT=1521)) (ADDRESS=(PROTOCOL=TCP)(HOST=vico01.trivadis.com)(PORT=1521))) (CONNECT_DATA = (SERVICE_NAME = sour.trivadis.com) (FAILOVER_MODE = (TYPE = SESSION) (METHOD = BASIC) (RETRIES = 180) (DELAY = 1) ) ) ) ! TAF is for OCI Drivers only Thin Driver: do not use TAF
  • 27. Use Case: Classic Data Guard Failover / Switchover Get the Most out of Oracle Data Guard!27 9/1/2017 sour_ludo sour_vico sour_RW CLIENTS srvctl add service -db sour_vico -service sour_RW -role PRIMARY (ADDRESS=(HOST=ludo01)(PORT=1521)) (ADDRESS=(HOST=vico01)(PORT=1521)) MRP0
  • 28. Use Case: Classic Data Guard Failover / Switchover Get the Most out of Oracle Data Guard!28 9/1/2017 sour_ludo sour_vico sour_RW CLIENTS srvctl add service -db sour_vico -service sour_RW -role PRIMARY (ADDRESS=(HOST=ludo01)(PORT=1521)) (ADDRESS=(HOST=vico01)(PORT=1521)) MRP0
  • 29. Use Case: Migrate Standalone on another server Get the Most out of Oracle Data Guard!29 9/1/2017 sour CLIENTS (ADDRESS=(HOST=ludo01)(PORT=1521))
  • 30. Use Case: Migrate Standalone on another server Get the Most out of Oracle Data Guard!30 9/1/2017 sour CLIENTS (ADDRESS=(HOST=ludo01)(PORT=1521)) sour_newMRP0 – Set up Standby instance
  • 31. Use Case: Migrate Standalone on another server Get the Most out of Oracle Data Guard!31 9/1/2017 sour CLIENTS (ADDRESS=(HOST=ludo01)(PORT=1521)) sour_newMRP0 – Set up Standby instance – Stop application
  • 32. Use Case: Migrate Standalone on another server Get the Most out of Oracle Data Guard!32 9/1/2017 sour CLIENTS (ADDRESS=(HOST=ludo01)(PORT=1521)) sour_new MRP0 – Set up Standby instance – Stop application – Switchover
  • 33. Use Case: Migrate Standalone on another server Get the Most out of Oracle Data Guard!33 9/1/2017 sour CLIENTS (ADDRESS=(HOST=ludo01vico01)(PORT=1521)) sour_new MRP0 – Change TNS definition– Set up Standby instance – Stop application – Switchover
  • 34. Use Case: Migrate Standalone on another server Get the Most out of Oracle Data Guard!34 9/1/2017 sour CLIENTS (ADDRESS=(HOST=ludo01vico01)(PORT=1521)) sour_new MRP0 – Change TNS definition – Start application – Set up Standby instance – Stop application – Switchover
  • 35. Use Case: Migrate Standalone on another server Get the Most out of Oracle Data Guard!35 9/1/2017 CLIENTS (ADDRESS=(HOST=vico01)(PORT=1521)) sour_new – Set up Standby instance – Stop application – Switchover – Change TNS definition – Start application – Cleanup
  • 36. Use Case: Migrate Standalone on another server Get the Most out of Oracle Data Guard!36 9/1/2017 Problems – Requires application downtime (even if short) – Messy DB_UNIQUE_NAME naming convention
  • 37. Use Case: Migrate Standalone on another server Get the Most out of Oracle Data Guard!37 9/1/2017 Problems – Requires application downtime (even if short) – Messy DB_UNIQUE_NAME naming convention ?Better solutions?
  • 38. Use Case: Migrate Standalone on another server Get the Most out of Oracle Data Guard!38 9/1/2017 Problems – Requires application downtime (even if short) – Messy DB_UNIQUE_NAME naming convention (ADDRESS=(HOST=ludo01)(PORT=1521)) (ADDRESS=(HOST=ludo01)(PORT=1521)) ?Better solutions? Hint: this is valid
  • 39. Use Case: Smart Standalone Configuration Get the Most out of Oracle Data Guard!39 9/1/2017 sour_ludo CLIENTS (ADDRESS=(HOST=sour-s1)(PORT=1521)) (ADDRESS=(HOST=sour-s2)(PORT=1521)) sour_RW sour-s1 IN CNAME ludo01 sour-s2 IN CNAME ludo01
  • 40. Use Case: Smart Standalone Configuration Get the Most out of Oracle Data Guard!40 9/1/2017 sour_ludo CLIENTS (ADDRESS=(HOST=sour-s1)(PORT=1521)) (ADDRESS=(HOST=sour-s2)(PORT=1521)) sour_RW sour-s1 IN CNAME ludo01 sour-s2 IN CNAME ludo01 sour_vicoMRP0
  • 41. Use Case: Smart Standalone Configuration Get the Most out of Oracle Data Guard!41 9/1/2017 sour_ludo CLIENTS (ADDRESS=(HOST=sour-s1)(PORT=1521)) (ADDRESS=(HOST=sour-s2)(PORT=1521)) sour_RW sour-s1 IN CNAME ludo01 sour-s2 IN CNAME vico01 sour_vicoMRP0
  • 42. Use Case: Smart Standalone Configuration Get the Most out of Oracle Data Guard!42 9/1/2017 sour_ludo CLIENTS (ADDRESS=(HOST=sour-s1)(PORT=1521)) (ADDRESS=(HOST=sour-s2)(PORT=1521)) sour_RW sour-s1 IN CNAME ludo01 sour-s2 IN CNAME vico01 sour_vicoMRP0 TAF!
  • 43. Use Case: Smart Standalone Configuration Get the Most out of Oracle Data Guard!43 9/1/2017 sour_ludo CLIENTS (ADDRESS=(HOST=sour-s1)(PORT=1521)) (ADDRESS=(HOST=sour-s2)(PORT=1521)) sour_RW sour-s1 IN CNAME vico01 sour-s2 IN CNAME vico01 sour_vicoMRP0 TAF!
  • 44. Use Case: Smart Standalone Configuration Get the Most out of Oracle Data Guard!44 9/1/2017 CLIENTS (ADDRESS=(HOST=sour-s1)(PORT=1521)) (ADDRESS=(HOST=sour-s2)(PORT=1521)) sour_RW sour-s1 IN CNAME vico01 sour-s2 IN CNAME vico01 sour_vico TAF!
  • 45. Use Case: Smart Standalone Configuration Get the Most out of Oracle Data Guard!45 9/1/2017 CLIENTS (ADDRESS=(HOST=sour-s1)(PORT=1521)) (ADDRESS=(HOST=sour-s2)(PORT=1521)) sour_RW sour-s1 IN CNAME vico01 sour-s2 IN CNAME vico01 sour_vico TAF!
  • 46. Get the Most out of Oracle Data Guard!46 9/1/2017 Live Demo?
  • 47. Get the Most out of Oracle Data Guard!47 9/1/2017 Snapshot Standby
  • 48. Physical Standby (simplified) Get the Most out of Oracle Data Guard!48 9/1/2017 stout_ludo stout_vicoLGWR RFS MRP0 ol stbl arcarc
  • 49. Snapshot Standby (simplified) Get the Most out of Oracle Data Guard!49 9/1/2017 stout_ludo stout_vicoLGWR RFS ol stbl arcarc LGWR ol arc
  • 50. Snapshot Standby Get the Most out of Oracle Data Guard!50 9/1/2017 Requirements – Correct Data Guard configuration with a physical standby – Physical standby has Fast Recovery Area Configured – FORCE LOGGING is not mandatory but simplifies everything Conversion to Snapshot Standby without broker – ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL; – ALTER DATABASE CONVERT TO SNAPSHOT STANDBY; – ALTER DATABASE OPEN READ WRITE; Conversion to Snapshot standby with broker – CONVERT DATABASE <name> TO SNAPSHOT STANDBY;
  • 51. Conversion Get the Most out of Oracle Data Guard!51 9/1/2017 Stop Redo Apply Create Guaranteed Restore Point Flush Standby Logs Clear Online Logfiles Convert to Primary Open resetlogs Start RFS process to get redo stream from the primary
  • 52. Two sources for Archive Logs? Get the Most out of Oracle Data Guard!52 9/1/2017 SQL> select THREAD#, SEQUENCE#, RESETLOGS_ID, FIRST_CHANGE#, NEXT_CHANGE#, REGISTRAR, ACTIVATION# from v$archived_log WHERE next_time>(sysdate-1/24); THREAD# SEQUENCE# RESETLOGS_ID FIRST_CHANGE# NEXT_CHANGE# REGISTR ACTIVATION# ---------- ---------- ------------ ------------- ------------ ------- ----------- 1 22 952446304 648113 652296 RFS 3044612576 1 23 952446304 652296 652300 RFS 3044612576 1 24 952446304 652300 652361 RFS 3044612576 1 25 952446304 652361 652404 RFS 3044612576 1 26 952446304 652404 652410 RFS 3044612576 1 27 952446304 652410 653523 RFS 3044612576 1 28 952446304 653523 653529 RFS 3044612576 1 29 952446304 653529 657362 RFS 3044612576 1 30 952446304 657362 657399 RFS 3044612576 1 31 952446304 657399 657461 RFS 3044612576 1 32 952446304 657461 661863 RFS 3044612576 1 33 952446304 661863 661869 RFS 3044612576 1 34 952446304 661869 662080 RFS 3044612576 1 1 952543943 661845 662731 ARCH 3044656145
  • 53. Use Case: SNAP STANDBY ONLY Get the Most out of Oracle Data Guard!53 9/1/2017 stout_ludo stout_vico stout_RW stout_SNAP CLIENTS srvctl add service -db stout_vico -service stout_SNAP -role SNAPSHOT_STANDBY (ADDRESS=(HOST=vico01)(PORT=1521)) (ADDRESS=(HOST=ludo01)(PORT=1521))
  • 54. Use Case: SNAP STANDBY ONLY Get the Most out of Oracle Data Guard!54 9/1/2017 stout_ludo stout_vico stout_RW stout_SNAP CLIENTS srvctl add service -db stout_vico -service stout_SNAP -role SNAPSHOT_STANDBY (ADDRESS=(HOST=vico01)(PORT=1521)) (ADDRESS=(HOST=ludo01)(PORT=1521)) MRP0
  • 55. Use Case: SNAP STANDBY ONLY Get the Most out of Oracle Data Guard!55 9/1/2017 srvctl add service -db stout_vico -service stout_snap.trivadistraining.com -role “SNAPSHOT_STANDBY” -failovertype SELECT -failovermethod BASIC stout_SNAP.trivadistraining.com = (DESCRIPTION = (CONNECT_TIMEOUT = 5 )(TRANSPORT_CONNECT_TIMEOUT = 3 ) (ADDRESS_LIST = (LOAD_BALANCE = OFF ) (ADDRESS = (PROTOCOL = TCP )(HOST = vico01.trivadistraining.com )(PORT = 1521 )) (ADDRESS = (PROTOCOL = TCP )(HOST = ludo01.trivadistraining.com )(PORT = 1521 )) ) (CONNECT_DATA = (SERVICE_NAME = stout_SNAP.trivadistraining.com ) ) )
  • 56. Use Case: SNAP STANDBY or PRIMARY Get the Most out of Oracle Data Guard!56 9/1/2017 stout_ludo stout_vico stout_RW stout_SNAP CLIENTS srvctl add service -db stout_vico -service stout_SNAP -role “SNAPSHOT_STANDBY,PRIMARY” (ADDRESS=(HOST=vico01)(PORT=1521)) (ADDRESS=(HOST=ludo01)(PORT=1521)) stout_SNAP
  • 57. Use Case: SNAP STANDBY or PRIMARY Get the Most out of Oracle Data Guard!57 9/1/2017 stout_ludo stout_vico stout_RW stout_SNAP CLIENTS srvctl add service -db stout_vico -service stout_SNAP -role “SNAPSHOT_STANDBY,PRIMARY” (ADDRESS=(HOST=vico01)(PORT=1521)) (ADDRESS=(HOST=ludo01)(PORT=1521)) stout_SNAP MRP0
  • 58. Use Case: SNAP STANDBY or PRIMARY Get the Most out of Oracle Data Guard!58 9/1/2017 srvctl add service -db stout_vico -service stout_snap.trivadistraining.com -role “PRIMARY,SNAPSHOT_STANDBY” -failovertype SELECT -failovermethod BASIC stout_SNAP.trivadistraining.com = (DESCRIPTION = (CONNECT_TIMEOUT = 5 )(TRANSPORT_CONNECT_TIMEOUT = 3 ) (ADDRESS_LIST = (LOAD_BALANCE = OFF ) (ADDRESS = (PROTOCOL = TCP )(HOST = vico01.trivadistraining.com )(PORT = 1521 )) (ADDRESS = (PROTOCOL = TCP )(HOST = ludo01.trivadistraining.com )(PORT = 1521 )) ) (CONNECT_DATA = (SERVICE_NAME = stout_SNAP.trivadistraining.com ) ) )
  • 59. Get the Most out of Oracle Data Guard!59 9/1/2017 Live Demo?
  • 60. Use Case: Double SNAP STANDBY Get the Most out of Oracle Data Guard!60 9/1/2017 stout_ludo stout_vico stout_RW stout_SNAP CLIENTS srvctl add service -db stout_vico -service stout_SNAP -role “SNAPSHOT_STANDBY” (ADDRESS=(HOST=vico01)(PORT=1521)) (ADDRESS=(HOST=piwo01)(PORT=1521)) stout_piwoMRP0
  • 61. Use Case: Double SNAP STANDBY Get the Most out of Oracle Data Guard!61 9/1/2017 stout_ludo stout_vico stout_RW stout_SNAP CLIENTS srvctl add service -db stout_vico -service stout_SNAP -role “SNAPSHOT_STANDBY” (ADDRESS=(HOST=vico01)(PORT=1521)) (ADDRESS=(HOST=piwo01)(PORT=1521)) stout_piwo stout_SNAP
  • 62. Use Case: Double SNAP STANDBY Get the Most out of Oracle Data Guard!62 9/1/2017 stout_ludo stout_vico stout_RW CLIENTS srvctl add service -db stout_vico -service stout_SNAP -role “SNAPSHOT_STANDBY” (ADDRESS=(HOST=vico01)(PORT=1521)) (ADDRESS=(HOST=piwo01)(PORT=1521)) stout_piwo MRP0 stout_SNAP
  • 63. Two Standby Databases Use Case Get the Most out of Oracle Data Guard!63 9/1/2017 srvctl add service -db stout_vico -service stout_snap.trivadistraining.com -role “SNAPSHOT_STANDBY” -failovertype SELECT -failovermethod BASIC stout_SNAP.trivadistraining.com = (DESCRIPTION = (CONNECT_TIMEOUT = 5 )(TRANSPORT_CONNECT_TIMEOUT = 3 ) (ADDRESS_LIST = (LOAD_BALANCE = OFF ) (ADDRESS = (PROTOCOL = TCP )(HOST = vico01.trivadistraining.com )(PORT = 1521 )) (ADDRESS = (PROTOCOL = TCP )(HOST = piwo01.trivadistraining.com )(PORT = 1521 )) ) (CONNECT_DATA = (SERVICE_NAME = stout_SNAP.trivadistraining.com ) ) )
  • 64. Get the Most out of Oracle Data Guard! Standby Consistency on recovery cancel 9/1/201764
  • 65. stout_vico Redo Apply (roll-forward) Get the Most out of Oracle Data Guard!65 9/1/2017 BUFFER CACHE datafilesfuzzy datafiles dbw0 stout_ludo LGWR RFS MRP0 ol stbl arcarc ckpt
  • 66. Block status Get the Most out of Oracle Data Guard!66 9/1/2017 SQL> select status, dirty, count(*) from v$bh 2> group by status, dirty order by status, dirty; STATUS D COUNT(*) ---------- - ---------- free N 11 mrec N 3013 mrec Y 82 DGMGRL> edit database stout_vico set state='APPLY-OFF'; SQL> select status, dirty, count(*) from v$bh 2> group by status, dirty order by status, dirty; STATUS D COUNT(*) ---------- - ---------- free N 7012
  • 67. Block status Get the Most out of Oracle Data Guard!67 9/1/2017 SQL> select status, dirty, count(*) from v$bh 2> group by status, dirty order by status, dirty; STATUS D COUNT(*) ---------- - ---------- free N 11 mrec N 3013 mrec Y 82 DGMGRL> edit database stout_vico set state='APPLY-OFF'; SQL> select status, dirty, count(*) from v$bh 2> group by status, dirty order by status, dirty; STATUS D COUNT(*) ---------- - ---------- free N 7012 ORA-16037: user requested cancel of managed recovery operation Managed Standby Recovery not using Real Time Apply Recovery interrupted! Recovered data files to a consistent state at change 292504638291
  • 68. Consistent datafiles == consistent database Get the Most out of Oracle Data Guard!68 9/1/2017 No additional media recovery required before OPEN RESETLOGS – Cold backups via filesystem commands – Cloning possible without bother with Online or Archive Logs! Consistent Standby + ACFS Snapshots (or other) = Cheap Database Cloning
  • 69. Cloning solution based on Standby Database Get the Most out of Oracle Data Guard!69 9/1/2017 ludo01 GRID INFRASTRUCTURE 12cR2 DG +DATA ACFS /u02/fra ACFS /u02/data stout_ludo SNAPSHOT stout vico01 GRID INFRASTRUCTURE 12cR2 DG +DATA ACFS /u02/data ACFS /u02/fra stout_vico SNAPSHOT stout MRP0 SNAPSHOT clone1 clone1 SNAPSHOT COPYSNAPSHOT COPYSNAPSHOT COPYSNAPSHOT COPYSNAPSHOT COPYSNAPSHOT COPYSNAPSHOT Sunday
  • 70. Cloning Steps Get the Most out of Oracle Data Guard!70 9/1/2017 Snapshot creation – edit database stout_vico set state=‘APPLY-OFF’; – acfsutil snap create -w -p stout stout.`date +%A` /u02/data – alter database backup controlfile to trace as ‘/u02/data/.ACFS/snaps/…’ ; – create pfile=‘/u02/data/.ACFS/snaps/…’ from spfile; – edit database stout_vico set state=‘APPLY-ON’;
  • 71. Cloning Steps Get the Most out of Oracle Data Guard!71 9/1/2017 Cloning the database from the snapshot – Abort previous instance / delete previous snapshot – acfsutil snap create -w -p stout.`date +%A` clone1 /u02/data – sed -i -e ‘s/stout_vico/clones/g’ init.ora control_trace.trc – startup open resetlogs
  • 72. Get the Most out of Oracle Data Guard!72 9/1/2017 Live Demo?
  • 73. Get the Most out of Oracle Data Guard!73 9/1/2017 Let me do one more example
  • 74. Database reorganization live Get the Most out of Oracle Data Guard!74 9/1/2017 Setup physical standby Convert to logical standby << Here the standby is OPEN Stop SQL Apply Reorganize your database Start SQL Apply and catch the primary Switchover to Logical Standby
  • 75. Get the Most out of Oracle Data Guard! Conclusions 9/1/201775
  • 76. BASEL BERN BRUGG DÜSSELDORF FRANKFURT A.M. FREIBURG I.BR. GENF HAMBURG KOPENHAGEN LAUSANNE MÜNCHEN STUTTGART WIEN ZÜRICH Questions in front of a beer! High Five POUG #POUG2017 Ludovico Caldara Oracle ACE Director Senior Consultant