Download Zero Downtime Migrations using Oracle GoldenGate

1
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Zero Downtime Migrations
using Oracle GoldenGate
Thomas Niewel
Principal Sales Consultant
The following is intended to outline our general product
direction. It is intended for information purposes only, and
may not be incorporated into any contract. It is not a
commitment to deliver any material, code, or functionality,
and should not be relied upon in making purchasing
decisions. The development, release, and timing of any
features or functionality described for Oracle’s products
remains at the sole discretion of Oracle.
3
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Agenda
4
ƒ
GoldenGate Architecture
ƒ
GoldenGate 11.2 Classic Capture vs. Integrated Capture
ƒ
Zero Downtime Migrations
ƒ
Instantiation Methods for the Target Database
ƒ
Sizing Aspects
ƒ
Setup of Oracle GoldenGate Including a Failback Environment
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Oracle GoldenGate
Low-Impact Real-Time Data Integration & Transactional Replication
Zero Downtime Upgrade
& Migration
New DB/HW/OS/APP
Highly Available /
Disaster Recovery
Legacy
Fully Active Distributed DB
Query Offloading,
Disaster Recovery
Log-based,
changed data
Reporting Database
Real-time BI, Operational
Reporting, MDM
Database
ODS
Data Integrator
Data Warehouse
Data Synchronization
across the Enterprise
Global Data Centers
Event Driven
Architecture, SOA
Message Bus
Message Bus
5
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Oracle GoldenGate Topologies
Unidirectional
Bi-Directional
Peer-to-Peer
Query Offloading
Zero-Downtime Migration
Hot Standby or
Active-Active for HA
Load Balancing
Multi-Master
Broadcast
Integration/Consolidation
Data Distribution
Data Distribution
Data Warehouse
via Messaging
BPM
BAM
CEP
6
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Oracle GoldenGate Documentation
ƒ Documentation:
ƒ http://www.oracle.com/technetwork/middleware/g
oldengate/documentation/index.html
ƒ Certification Matrix
ƒ http://www.oracle.com/technetwork/middleware/i
as/downloads/fusion-certification-100350.html
7
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7
GoldenGate Architecture
Source: Oracle GoldenGate Windows and UNIX Administrator’s Guide
8
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
GoldenGate DDL Replication
ƒ DDL Replication is a trigger based solution
ƒ Table structure on source and target environment
must be identical
ƒ DDL Replication only possible in a homogenous
environment
ƒ Setup
ƒ marker_setup.sql
ƒ ddl_setup.sql
9
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
How GoldenGate Works
Source: Oracle GoldenGate Windows and UNIX Administrator’s Guide
10
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Agenda
11
ƒ
GoldenGate Architecture
ƒ
GoldenGate 11.2 Classic Capture vs. Integrated Capture
ƒ
Zero Downtime Migrations
ƒ
Instantiation Methods for the Target Database
ƒ
Sizing Aspects
ƒ
Setup of Oracle GoldenGate Including a Failback Environment
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
GoldenGate 11.2 – Classic Capture
Source: Oracle GoldenGate Windows and UNIX Administrator’s Guide
12
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
GoldenGate 11.2 – Integrated Capture
Integrated Capture: See note 1411356.1 for Oracle 11.2.0.3 required patches
Source: Oracle GoldenGate Windows and UNIX Administrator’s Guide
13
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
GoldenGate 11.2
Classic Capture or Integrated Capture ?
ƒ Classic Capture
ƒ Most data types supported
ƒ Restricted support for complex data types
ƒ GoldenGate Profiling Scripts
ƒ Note 1298562.1 (Database)
ƒ Note 1296168.1 (Schema)
14
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
GoldenGate 11.2
Classic Capture or Integrated Capture ?
ƒ Integrated Capture
ƒ Fully integrated with the database, no additional setup is
required to work with Oracle RAC, ASM, and TDE
ƒ Easier Integration into RAC
ƒ Integrated Log Management, because of Logminer usage
ƒ Classic Capture Restrictions abandoned (see next slides)
ƒ Downstream Capture
15
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
GoldenGate 11.2
Integrated Capture vs. Classic Capture
Some important Features
Compression (Basic, OLTP,
EHCC)
Classic Capture
X
9
Partially
9
X
9
RAC with PDML
With Restrictions
9
RAC with XA
With Restrictions
9
XML
Mutithreaded
More details: Oracle GoldenGate for Oracle Installation and Setup Guide – Chapter 1.4
16
Integrated Capture
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
GoldenGate 11.2
Integrated Capture vs. Classic Capture
Database Version
10.2
Classic Capture
Integrated Capture
Supported
Supported *
11.1.0.7
TDE/TSE, Fetch support for
SecureFiles, ADTs, VARRAYS,
Nested Tables, Object Tables
Supports TDE/TSE *
11.2.0.2
TDE/TSE, Fetch support for
SecureFiles, ADTs, VARRAYS,
Nested Tables, Object Tables
TDE/TSE, XA-RAC, Compression,
SecureFiles, Fetch support for
ADTs, VARRAYS, Nested Tables,
Object Tables *
TDE/TSE Fetch support for
SecureFiles, ADTs, VARRAYS,
Nested Tables, Object Tables
TDE/TSE, XA-RAC, Compression,
XML Object Relational, XML
Binary, SecureFiles,Fetch support
for ADTs, VARRAYS, Nested
Tables, Object Tables
11.2.0.3
* Supported for Downstream Capture model only
Source: http://www.oracle.com/us/products/middleware/data-integration/goldengate-11gr2-new-features-wp-1736116.pdf
17
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Agenda
18
ƒ
GoldenGate Architecture
ƒ
GoldenGate 11.2 Classic Capture vs. Integrated Capture
ƒ
Zero Downtime Migrations
ƒ
Instantiation Methods for the Target Database
ƒ
Sizing Aspects
ƒ
Setup of Oracle GoldenGate Including a Failback Environment
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Zero Downtime Migration
with Oracle GoldenGate
ƒ Example 1: near-zero-downtime upgrade with GoldenGate
Old environment
Linux guest new
extract
pump
replicat
+ ASM
+Diskgroup
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+ ASM
+Diskgroup
Zero Downtime Migration
with Oracle GoldenGate
ƒ Example 1: near-zero-downtime upgrade with GoldenGate
Old environment
Linux guest new
pump
extract
SCN=4711
+ ASM
+Diskgroup
SCN on source is 4711
Step 1: Start extract and pump process
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replicat
SCN=4711
......
+Diskgroup
+ ASM
Zero Downtime Migration
with Oracle GoldenGate
ƒ Example 1: near-zero-downtime upgrade with GoldenGate
Old environment
Linux guest new
extract
pump
replicat
SCN=4750
SCN=4711
.....
+ ASM
+ ASM
SCN 4750
+Diskgroup
export/import
Step 2: export/import with consistent SCN 4750
21
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
+Diskgroup
Zero Downtime Migration
with Oracle GoldenGate
ƒ Example 1: near-zero-downtime upgrade with GoldenGate
Old environment
Linux guest new
pump
extract
SCN=4790
+ ASM
replicat
SCN=4711
.....
+ ASM
SCN 4750
+Diskgroup
+Diskgroup
Step 3: Start replicat with SCN 4750
replicat process applies changes until databases are in sync
22
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Zero Downtime Migration
with Oracle GoldenGate
ƒ Example 1: near-zero-downtime upgrade with GoldenGate
Old environment
Linux guest new
replicat
failback
Pump
failback
Extract
failback
+ ASM
+ ASM
+Diskgroup
+Diskgroup
Step 4: Application can be stopped
Replication can be stopped and started in the opposite direction
Application can be started on the new database
23
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Zero Downtime Migration
Oracle 10.2 Æ Oracle 11g Cross-Platform (Linux x86 to Linux for z)
Example 2: near-zero-downtime upgrade with GoldenGate
Oracle 10.2 Clone Æ Oracle
Database 11g
Linux
Oracle 10.2
on Linux
Oracle
GoldenGate
Capture
Oracle
GoldenGate
Delivery
1. Start of the Oracle GoldenGate capture process
2. Create of a clone database; after that upgrade to Oracle 11g
3. Cross platform transportable tablespace metadata export
4. Use of a “full database NOROWS export” (Views, Packages, etc)
of the Clone DB
5. Installation of a new Oracle 11g Database on Linux for z
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Oracle 11g on
Linux for z
6. Cross platform transportable tablespaces
metadata Import and transfer of the datafiles with
conversion of the endianess
7. Full Import with IGNORE option
8. Start Oracle GoldenGate Delivery on Linux for z
Zero Downtime Migration
Oracle 10.2 Æ Oracle 11g Cross-Platform (Linux x86 to Linux for z)
Example 2: near-zero-downtime upgrade with GoldenGate
Oracle 10.2 Clone Æ Oracle
11g Linux
Oracle 10.2
Linux
Failback option
Oracle Database 11g
Linux for z
9.
10.
11.
12.
13.
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Wait until source and target database are in sync
Stop the application and wait until all data is processed
Start Oracle GoldenGate Capture on the z/Linux platform
Start Oracle GoldenGate Delivery on the Linux platform
**SWITCHOVER** of the application
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Things to Consider
ƒ Trigger
ƒ Disable triggers
ƒ Replicat parameter DBOPTIONS SUPPRESSTRIGGERS
ƒ Referential integrity
ƒ Disable cascading delete constraints on target
ƒ Replicat parameter DBOPTIONS DEFERREFCONST
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Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Things to Consider
ƒ Sequences
ƒ Supported with uni-directional active-passive topology
ƒ Target sequence value always higher (or equal, if
the cache is 0) than source sequence value
27
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Agenda
28
ƒ
GoldenGate Architecture
ƒ
GoldenGate 11.2 Classic Capture vs. Integrated Capture
ƒ
Zero Downtime Migrations
ƒ
Instantiation Methods for the Target Database
ƒ
Sizing Aspects
ƒ
Setup of Oracle GoldenGate Including a Failback Environment
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Methods for an Instantiation of the Target
Database
ƒ expdp/impdp
ƒ expdp/impdp via a database link
ƒ (Cross platform) Transportable Tablespaces
ƒ CTAS (Create Table As Select)
ƒ Export / Import
ƒ Backup / Restore (see Note 369644.1 and 1079563.1)
ƒ Instantiation with GoldenGate
ƒ …..
29
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Methods for an Instantiation of the Target
Database - Examples
1. SELECT DBMS_FLASHBACK.GET_SYSTEM_CHANGE_NUMBER
FROM DUAL;
a) Insert into target select * from scott.emp as of scn 3488839
b) expdp strmadmin SCHEMAS=hr DIRECTORY=DPUMP_DIR
DUMPFILE=hr_schema_dp.dmp FLASHBACK_SCN=3488839
c) RMAN> backup database plus archivelog ;
RMAN> duplicate target database to <databasename>
nofilenamecheck until scn <value returned from “RMAN
restore database preview summary” command> (see Notes 369644.1 and
1079563.1)
2. Start of the replicat process (depending on instantiation method)
START REPLICAT <name> AFTERCSN <3488839>
START REPLICAT <name> ATCSN <3488839>
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Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Instantiation without the Determination of an
SCN
ƒ
HANDLECOLLISIONS (Replicat Parameter) has to be used
ƒ
Works fine if Primary Key / Unique Index available
ƒ
Tables without Primary Key / Unique Index
ƒ
ƒ
Duplicate rows in case of insert statements
Described in Oracle GoldenGate Installation and Setup Guide
Use the HANDLECOLLISIONS and NOHANDLECOLLISIONS parameters to control whether or not
Replicat tries to resolve duplicate-record and missing-record errors when applying SQL on the
target. These errors can occur during an initial load, when data from source tables is being
loaded to target tables while Oracle GoldenGate is replicating transactional changes that are
being made to those tables. When Oracle GoldenGate applies the replicated changes after the
load is finished, HANDLECOLLISIONS causes Replicat to overwrite duplicate records in the target
tables and provides alternate handling of errors for missing records
31
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Instantiation with GoldenGate
32
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Agenda
33
ƒ
GoldenGate Architecture
ƒ
GoldenGate 11.2 Classic Capture vs. Integrated Capture
ƒ
Zero Downtime Migrations
ƒ
Instantiation Methods for the Target Database
ƒ
Sizing Aspects
ƒ
Setup of Oracle GoldenGate Including a Failback Environment
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Determine the Resource Usage
of the Source Environment
ƒ Oracle
– Oracle Enterprise Manager
– AWR reports
ƒ Unix
– sar
– iostat
– vmstat
34
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Example:
I/O Determined by AWR Report
Load profile
~~~~~~~~~~~~
35
Per Second
Per Transaction
---------------
---------------
Redo size:
18,884,730.34
72,451.84
Logical reads:
26,685.24
102.38
Block changes:
16,810.84
64.50
Physical reads:
272.99
1.05
Physical writes:
2,170.07
8.33
User calls:
2,597.49
9.97
Parses:
521.30
2.00
Hard parses:
0.05
0.00
Sorts:
1.37
0.01
Logons:
0.05
0.00
Executes:
523.53
2.01
Transactions:
260.65
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Example:
Avg CPU Usage Determined by AWR Report
Statistic
Total
per Second
per Trans
-------------------------------- ------------------ -------------- ------------CPU used by this session
40,637
44.0
0.2
CPU used when call started
40,431
43.7
0.2
6
0.0
0.0
476
0.5
0.0
1
0.0
0.0
572,703
619.5
2.4
83,867
90.7
0.4
33
0.0
0.0
2,253
2.4
0.0
DBWR object drop buffers written
0
0.0
0.0
DBWR thread checkpoint buffers w
19,530
21.1
0.1
CR blocks created
Cached Commit SCN referenced
Commit SCN cached
DB time
DBWR checkpoint buffers written
DBWR checkpoints
DBWR fusion writes
36
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Example:
PGA Usage Determined by AWR Report
PGA Memory Advisory
DB/Inst: TEST/TEST1
Snap: 8315
-> When using Auto Memory Mgmt, minimally choose a pga_aggregate_target value
where Estd PGA Overalloc Count is 0
Estd Extra
Estd PGA
Estd PGA
PGA Target
Size
W/A MB
W/A MB Read/
Cache Overalloc
Est (MB)
Factr
Processed Written to Disk
Hit %
Count
---------- ------- ---------------- ---------------- -------- ---------13
0.1
552.6
13.2
98.0
5
25
0.3
552.6
13.2
98.0
5
50
0.5
552.6
0.0
100.0
0
75
0.8
552.6
0.0
100.0
0
100
1.0
552.6
0.0
100.0
0
120
1.2
552.6
0.0
100.0
0
140
1.4
552.6
0.0
100.0
0
160
1.6
552.6
0.0
100.0
0
180
1.8
552.6
0.0
100.0
0
200
2.0
552.6
0.0
100.0
0
300
3.0
552.6
0.0
100.0
0
400
4.0
552.6
0.0
100.0
0
600
6.0
552.6
0.0
100.0
0
37
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Example:
SGA Usage Determined by AWR Report
SGA Target Advisory
DB/Inst: ORA1/ORA1P5
SGA Target
SGA Size
Est DB
Est Physical
Size (M)
Factor
Time (s)
Reads
Snap: 8315
---------- ---------- ------------ ---------------150
0.5
7,535
139,852
225
0.8
7,416
123,298
300
1.0
7,381
118,408
375
1.3
7,356
117,413
450
1.5
7,339
115,022
525
1.8
7,339
115,022
600
2.0
7,339
115,022
-------------------------------------------------------------
38
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Example:
Buffer Pool Usage Determined by AWR Report
Buffer Pool Advisory
DB/Inst: ORA1/ORA1P5
-> Only rows with estimated physical reads >0 are displayed
-> ordered by Block Size, Buffers For Estimate
Est
Phys
Size for
P
Size
Buffers for
Est (M) Factor
Read
Estimated
Estimate Factor
Physical Reads
--- -------- ------ ---------------- ------ ------------------
39
D
112
.6
13,636
1.1
124,799
D
128
.7
15,584
1.0
122,965
D
144
.8
17,532
1.0
121,753
D
160
.8
19,480
1.0
120,741
D
176
.9
21,428
1.0
119,683
D
192
1.0
23,376
1.0
118,657
D
208
1.1
25,324
1.0
117,740
D
224
1.2
27,272
1.0
116,939
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Snap: 8315
Dedicated Server Processes
ƒ The storage used by dedicated server threads can be calculated as follows:
ƒ Max(logons current) multiplied by storage used per thread
ƒ Storage used per thread is 5MB (Calculated on an idle system by opening
a sqlplus session. The storage usage was monitored with the Linux free
command
40
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Agenda
41
ƒ
GoldenGate Architecture
ƒ
GoldenGate 11.2 Classic Capture vs. Integrated Capture
ƒ
Zero Downtime Migrations
ƒ
Instantiation Methods for the Target Database
ƒ
Sizing Aspects
ƒ
Setup of Oracle GoldenGate Including a Failback Environment
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Example – Zero Downtime Migration with
Oracle GoldenGate
ƒ Simple Example of a zero downtime migration
–
Installation/configuration of GoldenGate on source and
target environment
42
–
Classic Capture is used
–
No DDL replication is performed
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Zero Downtime Migration with Oracle
GoldenGate
ƒ Replication Environment
PAZXXT08
PAZXXT09
Extract
Capt01
Trail File
rt
Schema srcusr
Schema trgtusr
Expdp/impdp
43
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Replicat
Apply01
Zero Downtime Migration with Oracle
GoldenGate
ƒ Failback Environment
PAZXXT08
PAZXXT09
replicat
applyf01
Trail files
ft
Schema srcusr
44
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Extract
captf01
Schema trgtusr
Example – Zero Downtime Migration with
Oracle GoldenGate
Oracle GoldenGate Command Interpreter for OracleVersion 11.2.1.0.2 OGGCORE_11.2.1.0.2T3_PLATFORMS_120724.2205
Linux, s390x, 64bit (optimized), ......
GGSCI (PAZXXT08) 3> dblogin userid gg112, password gg112
Successfully logged into database.
GGSCI (PAZXXT08) 4> add trandata srcusr.*
2013-01-15 03:40:29
WARNING OGG-00869
No unique key is defined for table 'DEPT'. All viable columns will
be used to represent the key, but may not guarantee uniqueness.
Logging of supplemental redo data enabled for table SRCUSR.DEPT.
Logging of supplemental redo data enabled for table SRCUSR.EMP.
45
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
KEYCOLS may be used to define the key.
Example – Zero Downtime Migration with
Oracle GoldenGate
GGSCI (PAZXXT08) 3> EDIT PARAMS capt01
Extract capt01
Userid gg112, password gg112
Rmthost pazxxt09.us.oracle.com , mgrport 1960
Rmttrail /home/oracle/GG_TRGT/rt
Table srcusr.*;
GGSCI (PAZXXT08) 4> add extract capt01,tranlog,begin now
EXTRACT added.
GGSCI (PAZXXT08) 5> add rmttrail /home/oracle/GG_TRGT/rt, EXTRACT capt01
RMTTRAIL added
46
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Example – Zero Downtime Migration with
Oracle GoldenGate
GGSCI (PAZXXT09) 2> dblogin userid gg112 password gg112
Successfully logged into database.
GGSCI (PAZXXT09) 3> add checkpointtable gg112.chkptab
Successfully created checkpoint table gg112.chkptab.
GGSCI (PAZXXT09) 1> edit params ./GLOBALS
checkpointtable gg112.chkptab
GGSCI (PAZXXT09) 1> add replicat apply01, exttrail /home/oracle/GG_TRGT/rt
47
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Example – Zero Downtime Migration with
Oracle GoldenGate
GGSCI (PAZXXT09) 1> EDIT PARAMS APPLY01
REPLICAT apply01
setenv (ORACLE_SID = "trgt")
SETENV (NLS_LANG = "AMERICAN_AMERICA.WE8MSWIN1252")
assumetargetdefs
userid gg112, password gg112
MAP srcusr.*,
48
target trgtusr.*;
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Example – Zero Downtime Migration with
Oracle GoldenGate
Preparation of the failback environment
GGSCI (PAZXXT09) 22> edit params captf01
extract captf01
Userid gg112, password gg112
Rmthost pazxxt08.us.oracle.com , mgrport 1860
Rmttrail /home/oracle/GG_SRC/ft
Table trgtusr.*;
GGSCI (PAZXXT09) 4> add extract captf01,tranlog,begin now
EXTRACT added.
GGSCI (PAZXXT09) 5> add rmttrail /home/oracle/GG_SRC/ft, EXTRACT captf01
RMTTRAIL added
49
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Example – Zero Downtime Migration with
Oracle GoldenGate
Preparation of the failback environment
Oracle GoldenGate Command Interpreter for Oracle
Version 11.2.1.0.2 OGGCORE_11.2.1.0.2T3_PLATFORMS_120724.2205
Linux, s390x, 64bit (optimized), ......
GGSCI (PAZXXT09) 2> dblogin userid gg112, password gg112
Successfully logged into database.
GGSCI (PAZXXT09) 3> add trandata trgtusr.*
2013-01-24 04:21:27
WARNING OGG-00869
No unique key is defined for table 'DEPT'. All viable columns will be
used to represent the key, but may not guarantee uniqueness.
KEYCOLS may be used to define the key.
Logging of supplemental redo data enabled for table TRGTUSR.DEPT.
Logging of supplemental redo data enabled for table TRGTUSR.EMP.
50
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Example – Zero Downtime Migration with
Oracle GoldenGate
Preparation of the failback environment
GGSCI (PAZXXT08) 8> edit params applyf01
REPLICAT applfy01
setenv (ORACLE_SID = "orcl")
SETENV (NLS_LANG = "AMERICAN_AMERICA.WE8MSWIN1252")
assumetargetdefs
userid gg112, password gg112
mAP trgtusr.*,
51
target srcusr.*;
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Example – Zero Downtime Migration with
Oracle GoldenGate
Preparation of the failback environment
GGSCI (PAZXXT08) 2> dblogin userid gg112 password gg112
Successfully logged into database.
GGSCI (PAZXXT08) 3> add checkpointtable gg112.chkptab
Successfully created checkpoint table gg112.chkptab.
GGSCI (PAZXXT08) 1> edit params ./GLOBALS
checkpointtable gg112.chkptab
GGSCI (PAZXXT08) > add replicat applyf01, exttrail /home/oracle/GG_SRC/ft, checkpointtable gg112.chkptab
52
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Example – Zero Downtime Migration with
Oracle GoldenGate
ƒ Step 1 Start capture process
GGSCI (PAZXXT08) 22> start capt01
Sending START request to MANAGER ...
EXTRACT CAPT01 starting
ƒ Step 2 - Instantiate the target database
SQL> SELECT DBMS_FLASHBACK.GET_SYSTEM_CHANGE_NUMBER FROM DUAL;
GET_SYSTEM_CHANGE_NUMBER
-----------------------33301382
expdp gg112 SCHEMAS=srcusr DIRECTORY=DUMP_DIR
DUMPFILE=src_usr_schema_dp.dmp FLASHBACK_SCN=33301382
53
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Example – Zero Downtime Migration with
Oracle GoldenGate
ƒ Step 2 - Instantiate the target database (continued)
On Target:
impdp gg112 DIRECTORY=DUMP_DIR DUMPFILE=src_usr_schema_dp.dmp
remap_schema=srcusr:trgtusr
ƒ Step 3 – Start apply process
GGSCI (PAZXXT09) 22> start apply01 aftercsn 33301382
54
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Example – Zero Downtime Migration with
Oracle GoldenGate
ƒ Step 4 – Wait until source and target database are in
sync
On Target:
GGSCI (PAZXXT09) 24> lag apply01
Sending GETLAG request to REPLICAT APPLY01 ...
Last record lag: 2 seconds.
At EOF, no more records to process.
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Example – Zero Downtime Migration with
Oracle GoldenGate
ƒ Step 5 – Stop the application
Wait until all changes are processed (check statistics)
GGSCI (PAZXXT08) 1> lag capt01
Sending GETLAG request to EXTRACT CAPT01 ...
Last record lag: 2 seconds.
At EOF, no more records to process.
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Example – Zero Downtime Migration with
Oracle GoldenGate
ƒ Step 5a – Stop the GoldenGate pocesses
GGSCI (PAZXXT08) 4> stop extract capt01
Sending STOP request to EXTRACT CAPT01 ...
Request processed.
ƒ Repeat those steps (5+5a) for all capture, pump and apply
processes
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Example – Zero Downtime Migration with
Oracle GoldenGate
ƒ Step 6 – Start the GoldenGate processes for the failback
ƒ Set starting point of failback apply process
GGSCI (PAZXXT09) 30> alter captf01 begin now
EXTRACT altered.
GGSCI (PAZXXT09) 31> alter extract captf01 etrollover
2013-01-24 04:35:35
INFO
OGG-01520
Rollover performed.
For each affected output trail of Version 10 or higher format, after starting the source extract, issue ALTER
EXTSEQNO
for that trail's reader (either pump EXTRACT or REPLICAT) to move the reader's scan to the new trail file;
not happen automatically.
EXTRACT altered.
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it will
Example – Zero Downtime Migration with
Oracle GoldenGate
GGSCI (PAZXXT09) 32> info captf01 detail
EXTRACT
CAPTF01
Initialized
2013-01-24 04:34
Checkpoint Lag
00:01:10 (updated 00:00:18 ago)
Log Read Checkpoint
Oracle Redo Logs
2013-01-24 04:34:25
Status STOPPED
Seqno 0, RBA 0
SCN 0.0 (0)
Target Extract Trails:
Remote Trail Name
/home/oracle/GG_SRC/ft
Target:
GGSCI (PAZXXT08) 33> alter applyf01 extseqno 2
REPLICAT altered.
GGSCI (PAZXXT08) 34> alter applyf01 extrba 0
REPLICAT altered.
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Seqno
RBA
Max MB
2
0
100
Example – Zero Downtime Migration with
Oracle GoldenGate
ƒ Step 6 (continued)
Start captf01 („new“ environment)
– Start Applyf01
–
ƒ Step 7 – Switch the application
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Example – Zero Downtime Migration with
Oracle GoldenGate
ƒ Things to consider
ƒ
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Before starting the instantiation of the target database,
no long running transactions should be active, because
of possible data loss. Long running transactions can be
monitored with the v$transaction view.
Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
More Information
ƒ
General information
http://www.oracle.com/us/products/middleware/data-integration/
goldengate/overview/index.html
http://www.oracle.com/technetwork/middleware/goldengate/overview/index.html
ƒ Oracle GoldenGate Zero Downtime Migrations
http://www.oracle.com/technetwork/middleware/goldengate/overview/ggzerodowntime
databaseupgrades-174928.pdf
ƒ
Oracle GoldenGate Statement of Direction
http://www.oracle.com/technetwork/middleware/goldengate/overview/statement-ofdirection-gg-132120.pdf
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