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GoldenGate Data Pump tips

Oracle Database Tips by Donald BurlesonMarch 5, 2015

Question:  I notice that GoldenGate uses data pump to replicate data.  Is this the esame data pump that does export (expdp) and import(impdp).

Answer:  No, when Oracle acquired GoldenGate, they inherited the utility named data pump, and oracle now has two distinct tools called data pump:

Data Pump export/import:  This is a command-line utility used to backup individual tables and schemas into flat files and import from flat files.

Goldengate Data Pump extract:  This is a process in Goldengate that takes and applies archived redo logs to a remote database.

So there we have it, two separate and distinct utilities named Data Pump.

Configure Data Pump for GoldenGate tips

To avoid the primary extract failure in case of network disconnections, the secondary group epmp02 is configured. The data pump extract routes the data to the target system leaving the primary extract dedicated to perform change data capture only. The data pump uses the parameter passthru to send data as is, unaltered. rmttrail identifies the remote trail name followed by the list of tables.

 

From within GGSCI command-line prepare parameter file epmp02.prm, it's saved on the default location of ./dirprm/ directory.

 

GGSCI (ggs-source) 1> EDIT PARAMS epmp02

EXTRACT EPMP02

 

USERID ggs_admin@S1E2, PASSWORD oracle

PASSTHRU

RMTHOST ggs-target, MGRPORT 7812

RMTTRAIL ./dirdat/tb

TABLE osm$repapi.policy_types;

TABLE osm$repapi.discount_types;

TABLE osm$repapi.customers;

TABLE osm$repapi.policies;

Create the secondary group in GoldenGate

The add extract command creates the secondary group. The data pump extract epmp02 reads the local trail file identified by the option exttrailsource.

 

GGSCI (ggs-source) 2> ADD EXTRACT epmp02, EXTTRAILSOURCE ./dirdat/sb 

 

EXTRACT added.

 

GGSCI (ggs-source) 3> ADD RMTTRAIL ./dirdat/tb, EXTRACT epmp02, MEGABYTES 128

 

RMTTRAIL added.

Starting the secondary extract in GoldenGate

Upon successful startup of the data pump group, local trail transaction are shipped over TCP/IP to the designated server by rmtrail and manager port, mgrport.

 

GGSCI (ggs-source) 9> START EXTRACT epmp02

 

Sending START request to MANAGER ...

EXTRACT EPMP02 starting

 

Before proceeding to configure the change data delivery group, we verify the data pump status is running, remote trail is created, and remote trail files are receiving transactional data. In case of errors, we correct the cause of the error and re-attempt restarting the database pump.

 

GGSCI (ggs-source) 10> INFO EXTRACT epmp02

 

EXTRACT    EPMP02    Last Started 2015-10-30 19:14   Status RUNNING

Checkpoint Lag       00:00:00 (updated 00:00:05 ago)

Process ID           24022

Log Read Checkpoint  File ./dirdat/sb000000

                     First Record  RBA 0


   
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