Category Archives: GoldenGate

Reading from remote logs setup of GoldenGate

Configure GoldenGate Extract to read from remote logs

Sometimes you may need to run GoldenGate on different machines than the ones that host the database. It is possible but there are restrictions that apply. First is that the endian order of both the systems should be same and the second is the bit-width has to be same. For example it is not possible to run GoldenGate on a 32-bit system to read from a database that runs on some 64-bit platform. Assuming that the environment satisfies the above two conditions; we can use the LOGSOURCE option of TRANSLOGOPTIONS to achieve this.

Here we run GG on host goldengate1 (192.168.0.109) and the database from which we want to capture the changes runs on the host goldengate3 (192.168.0.111) so two different hosts. Both the systems run 11.2.0.2 on RHEL 5.5. On goldengate3 redo logs are in the mount point /home which has been NFS mounted on goldengate1 as /home_gg3

This requires an NFS mount between systems for redo logs, not a goldengate process

Filesystem           1K-blocks      Used Available Use% Mounted on

192.168.0.111:/home   12184800   7962496   3593376  69% /home_gg3

The Extract parameters are as follows:

EXTRACT ERMT01

USERID ggadmin@orcl3, PASSWORD ggadmin

EXTTRAIL ./dirdat/er

TRANLOGOPTIONS LOGSOURCE LINUX, PATHMAP /home/oracle/app/oracle/oradata/orcl /home_gg3/oracle/app/oracle/oradata/or
cl, PATHMAP /home/oracle/app/oracle/flash_recovery_area/ORCL/archivelog /home_gg3/oracle/app/oracle/flash_recovery_
area/ORCL/archivelog

TABLE HR.*;

(The text in the line starting with TRANLOGOPTIONS is a single line)

So using PATHMAP we can make GG aware about the actual location of the redo logs & archive logs on the remote server and the mapped location on the system where GG is running (It is somewhat like db_file_name_convert option for Data Guards).

We fire some DMLs on the source database and then run stats command for the Extract

GGSCI (goldengate1) 93> stats ermt01 totalsonly *

Sending STATS request to EXTRACT ERMT01 ...

Start of Statistics at 2012-05-26 05:17:05.

Output to ./dirdat/er:

Cumulative totals for specified table(s):

*** Total statistics since 2012-05-26 04:51:10 ***
        Total inserts                                1.00
        Total updates                                0.00
        Total deletes                                1.00
        Total discards                               0.00
        Total operations                             2.00
.
.
.

End of Statistics.

GGSCI (goldengate1) 94>

For more details have a look at the GG reference guide (Page 402).

 

GoldenGate and DBFS

How To Setup 11 2 DBFS FileSystems Using the dbfs_client_API_Method_OK-April-15-2015

869822.1   Installing the DBFS

1150157.1  List of Critical patches

 

In summary the broad steps involved are:

1) Install and configure FUSE (Filesystem in Userspace)
2) Create the DBFS user and DBFS tablespaces
3) Mount the DBFS filesystem
5) Create symbolic links for the Goldengate software directories dirchk,dirpcs, dirdat, BR to point to directories on DBFS
6) Create the Application VIP
7) Download the mount-dbfs.sh script from MOS and edit according to our environment
8) Create the DBFS Cluster Resource
9) Download and install the Oracle Grid Infrastructure Bundled Agent
10) Register Goldengate with the bundled agents using agctl utility

 

Install and Configure FUSE

Using the following command check if FUSE has been installed:

lsmod | grep fuse

FUSE can be installed in a couple of ways – either via the Yum repository or using the RPM’s available on the OEL software media.

Using Yum:

yum install kernel-devel
yum install fuse fuse-libs

Via RPM’s:

If installing from the media, then these are the RPM’s which are required:

kernel-devel-2.6.32-358.el6.x86_64.rpm
fuse-2.8.3-4.el6.x86_64.rpm
fuse-devel-2.8.3-4.el6.x86_64.rpm
fuse-libs-2.8.3-4.el6.x86_64.rpm

A group named fuse must be created and the OS user who will be mounting the DBFS filesystem needs to be added to the fuse group.

For example if the OS user is ‘oracle’, then we use the usermod command to modify the secondary group membership for the oracle user. Important is to ensure we do not exclude any current groups the user already is a member of.

# /usr/sbin/groupadd fuse
# usermod -G dba,fuse oracle

One of the mount options which we will use is called “allow_other” which will enable users other than the user who mounted the DBFS file system to access the file system.

The /etc/fuse.conf  needs to have the “user_allow_other” option as shown below.

$ # cat /etc/fuse.conf
user_allow_other

chmod 644 /etc/fuse.conf

Important: Ensure that the variable LD_LIBRARY_PATH is set and includes the path to $ORACLE_HOME/lib. Otherwise we will get an error when we try to mount the DBFS using the dbfs_client executable.

Create the DBFS tablespaces and mount the DBFS

If the source database used by Goldengate Extract is running on RAC or hosted on Exadata then we will create ONE tablespace for DBF.

If the target database where Replicat will be applying changes in on RAC or Exadata, then we will create TWO tableapaces for DBFS with each tablespace having different logging and caching settings – typically one tablespace will be used for the Goldengate trail files and the other for the Goldengate checkpoint files.

If using Exadata then typically an ASM disk group called DBFS_DG will already be available for us to use, otherwise on an non-Exadata platform we will create a separate ASM disk group for holding DBFS files.

Note than since we will be storing Goldengate trail files on DBFS, a best practice would be to allocate enough disk space/tablespace space to be able to retain at least a minimum of 12-24 hours of trail files. So we need to keep that in mind when we create the ASM diskgroup or create the DBFS tablespace.

CREATE bigfile TABLESPACE dbfs_ogg_big datafile '+DBFS_DG' SIZE
1000M autoextend ON NEXT 100M LOGGING EXTENT MANAGEMENT LOCAL
AUTOALLOCATE SEGMENT SPACE MANAGEMENT AUTO;

Create the DBFS user

CREATE USER dbfs_user IDENTIFIED BY dbfs_pswd 
DEFAULT TABLESPACE dbfs_ogg_big
QUOTA UNLIMITED ON dbfs_ogg_big;

GRANT create session, 
      create table, 
      create view, 
      create procedure, 
      dbfs_role 
TO    dbfs_user; 


Create the DBFS Filesystem

To create the DBFS filesystem we connect as the DBFS_USER Oracle user account and either run the dbfs_create_filesystem.sql or dbfs_create_filesystem_advanced.sql script located under $ORACLE_HOME/rdbms/admin directory.

For example:

cd $ORACLE_HOME/rdbms/admin 

sqlplus dbfs_user/dbfs_pswd 


SQL> @dbfs_create_filesystem dbfs_ogg_big gg_source

OR

SQL> @dbfs_create_filesystem_advanced.sql dbfs_ogg_big  gg_source
      nocompress nodeduplicate noencrypt non-partition 

Where …
dbfs_ogg_big:  tablespace for the DBFS database objects
gg_source:         filesystem name, this can be any string and will appear as a directory under the mount point

If we were configuring DBFS on the Goldengate target or Replicat side of things, it is recommended to use the NOCACHE LOGGING attributes for the tablespace which holds the trail files because of the sequential reading and writing nature of the trail files.

For the checkpoint files on the other hand it is recommended to use CACHING and LOGGING attributes instead.

The example shown below illustrates how we can modify the LOB attributes.

(assuming we have created two DBFS tablespaces)

SQL> SELECT table_name, segment_name, cache, logging FROM dba_lobs 
     WHERE tablespace_name like 'DBFS%'; 

TABLE_NAME              SEGMENT_NAME                CACHE     LOGGING
----------------------- --------------------------- --------- -------
T_DBFS_BIG              LOB_SFS$_FST_1              NO        YES
T_DBFS_SM               LOB_SFS$_FST_11             NO        YES



SQL> ALTER TABLE dbfs_user.T_DBFS_SM 
     MODIFY LOB (FILEDATA) (CACHE LOGGING); 


SQL> SELECT table_name, segment_name, cache, logging FROM dba_lobs 
     WHERE tablespace_name like 'DBFS%';  

TABLE_NAME              SEGMENT_NAME                CACHE     LOGGING
----------------------- --------------------------- --------- -------
T_DBFS_BIG              LOB_SFS$_FST_1              NO        YES
T_DBFS_SM               LOB_SFS$_FST_11             YES       YES


As the user root, now create the DBFS mount point on ALL nodes of the RAC cluster (or Exadata compute servers).

# cd /mnt 
# mkdir DBFS 
# chown oracle:oinstall DBFS/

Create a custom tnsnames.ora file in a separate location (on each node of the RAC cluster).

In our 2 node RAC cluster for example these are entries we will make for the ORCL RAC database.

Node A

orcl =
  (DESCRIPTION =
      (ADDRESS =
        (PROTOCOL=BEQ)
        (PROGRAM=/u02/app/oracle/product/12.1.0/dbhome_1/bin/oracle)
        (ARGV0=oracleorcl1)
        (ARGS='(DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=BEQ)))')
        (ENVS='ORACLE_HOME=/u02/app/oracle/product/12.1.0/dbhome_1,ORACLE_SID=orcl1')
      )
  (CONNECT_DATA=(SID=orcl1))
)

Node B

orcl =
  (DESCRIPTION =
      (ADDRESS =
        (PROTOCOL=BEQ)
        (PROGRAM=/u02/app/oracle/product/12.1.0/dbhome_1/bin/oracle)
        (ARGV0=oracleorcl2)
        (ARGS='(DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=BEQ)))')
        (ENVS='ORACLE_HOME=/u02/app/oracle/product/12.1.0/dbhome_1,ORACLE_SID=orcl2')
      )
  (CONNECT_DATA=(SID=orcl2))
)


 

We will need to provide the password for the DBFS_USER database user account when we mount the DBFS filesystem via the dbfs_mount command. We can either store the password in a text file or we can use Oracle Wallet to encrypt and store the password.

In this example we are not using the Oracle Wallet, so we need to create a file (on all nodes of the RAC cluster) which will contain the DBFS_USER password.

For example:
echo dbfs_pswd > passwd.txt

nohup $ORACLE_HOME/bin/dbfs_client  dbfs_user@orcl -o allow_other,direct_io /mnt/DBFS < ~/passwd.txt &

After the DBFS filesystem is mounted successfully we can now see it via the ‘df’ command like shown below. Note in this case we had created a tablespace of 5 GB for DBFS and the space allocated and used displays that.

$  df -h |grep dbfs

dbfs-dbfs_user@:/     4.9G   11M  4.9G   1% /mnt/dbfs

The command used to unmount the DBFS filesystem would be:

fusermount -u 

Create links from Oracle Goldengate software directories to DBFS

Create the following directories on DBFS

$ mkdir /mnt/gg_source/goldengate 
$ cd /mnt/gg_source/goldengate 
$ mkdir dirchk
$ mkdir dirpcs 
$ mkdir dirprm
$ mkdir dirdat
$ mkdir BR

Make the symbolic links from Goldengate software directories to DBFS

cd /u03/app/oracle/goldengate
mv dirchk dirchk.old
mv dirdat dirdat.old
mv dirpcs dirpcs.old
mv dirprm dirprm.old
mv BR BR.old
ln -s /mnt/dbfs/gg_source/goldengate/dirchk dirchk
ln -s /mnt/dbfs/gg_source/goldengate/dirdat dirdat
ln -s /mnt/dbfs/gg_source/goldengate/dirprm dirprm
ln -s /mnt/dbfs/gg_source/goldengate/dirpcs dirpcs
ln -s /mnt/dbfs/gg_source/goldengate/BR BR

For example :

[oracle@rac2 goldengate]$ ls -l dirdat
lrwxrwxrwx 1 oracle oinstall 26 May 16 15:53 dirdat -> /mnt/dbfs/gg_source/goldengate/dirdat

Also copy the jagent.prm file which comes out of the box located in the dirprm directory

[oracle@rac2 dirprm.old]$ pwd
/u03/app/oracle/goldengate/dirprm.old
[oracle@rac2 dirprm.old]$ cp jagent.prm /mnt/dbfs/gg_source/dirprm

Note – in the Extract parameter file(s) we need to include the BR parameter pointing to the DBFS stored directory

BR BRDIR /mnt/dbfs/gg_source/goldengate/BR

Create the Application VIP

Typically the Goldengate source and target databases will be located outside the same Exadata machine and even in a non-Exadata RAC environment the source and target databases are on usually on different RAC clusters. In that case we have to use an Application VIP which is a cluster resource managed by Oracle Clusterware and the VIP assigned to one node will be seamlessly transferred to another surviving node in the event of a RAC (or Exadata compute) node failure.

Run the appvipcfg command to create the Application VIP as shown in the example below.

$GRID_HOME/bin/appvipcfg create -network=1 -ip= 192.168.56.90 -vipname=gg_vip_source -user=root

We have to assign an unused IP address to the Application VIP. We run the following command to identify the value we use for the network parameter as well as the subnet for the VIP.

$ crsctl stat res -p |grep -ie .network -ie subnet |grep -ie name -ie subnet

NAME=ora.net1.network
USR_ORA_SUBNET=192.168.56.0

As root give the Oracle Database software owner permissions to start the VIP.

$GRID_HOME/bin/crsctl setperm resource gg_vip_source -u user:oracle:r-x 

As the Oracle database software owner start the VIP

$GRID_HOME/bin/crsctl start resource gg_vip_source

Verify the status of the Application VIP

$GRID_HOME/bin/crsctl status resource gg_vip_source

 

Download the mount-dbfs.sh script from MOS

Download the mount-dbfs.sh script from MOS note 1054431.1.

Copy it to a temporary location on one of the Linux RAC nodes and run the command as root:

# dos2unix /tmp/mount-dbfs.sh

Change the ownership of the file to the Oracle Grid Infrastructure owner and also copy the file to the $GRID_HOME/crs/script directory location.

Next make changes to the environment variable settings section of the mount-dbfs.sh script as required. These are the changes I made to the script.

### Database name for the DBFS repository as used in "srvctl status database -d $DBNAME"
DBNAME=orcl

### Mount point where DBFS should be mounted
MOUNT_POINT=/mnt/dbfs

### Username of the DBFS repository owner in database $DBNAME
DBFS_USER=dbfs_user

### RDBMS ORACLE_HOME directory path
ORACLE_HOME=/u02/app/oracle/product/12.1.0/dbhome_1

### This is the plain text password for the DBFS_USER user
DBFS_PASSWD=dbfs_user

### TNS_ADMIN is the directory containing tnsnames.ora and sqlnet.ora used by DBFS
TNS_ADMIN=/u02/app/oracle/admin

### TNS alias used for mounting with wallets
DBFS_LOCAL_TNSALIAS=orcl

Create the DBFS Cluster Resource

Before creating the cluster resource for DBFS, test the mount-dbfs.sh script

$ ./mount-dbfs.sh start
$ ./mount-dbfs.sh status
Checking status now
Check – ONLINE

$ ./mount-dbfs.sh stop

As the Grid Infrastructure owner create a script called add-dbfs-resource.sh and store it in the $ORACLE_HOME/crs/script directory.

This script will create a Cluster Managed Resource called dbfs_mount by calling the Action Script mount-dbfs.sh which we had created earlier.

Edit the following variables in the script as shown below:

ACTION_SCRIPT
RESNAME
DEPNAME ( this can be the Oracle database or a database service)
ORACLE_HOME

#!/bin/bash
ACTION_SCRIPT=/u02/app/12.1.0/grid/crs/script/mount-dbfs.sh
RESNAME=dbfs_mount
DEPNAME=ora.orcl.db
ORACLE_HOME=/u01/app/12.1.0.2/grid
PATH=$ORACLE_HOME/bin:$PATH
export PATH ORACLE_HOME
crsctl add resource $RESNAME \
-type cluster_resource \
-attr "ACTION_SCRIPT=$ACTION_SCRIPT, \
CHECK_INTERVAL=30,RESTART_ATTEMPTS=10, \
START_DEPENDENCIES='hard($DEPNAME)pullup($DEPNAME)',\
STOP_DEPENDENCIES='hard($DEPNAME)',\
SCRIPT_TIMEOUT=300"

Execute the script – it should produce no output.

./ add-dbfs-resource.sh

 

Download and Install the Oracle Grid Infrastructure Bundled Agent

Starting with Oracle 11.2.0.3 on 64-bit Linux, out-of-the-box Oracle Grid Infrastructure bundled agents were introduced which had predefined clusterware resources for applications like Siebel and Goldengate.

The bundled agent for Goldengate provided integration between Oracle Goldengate and dependent resources like the database, filesystem and the network.

The AGCTL agent command line utility can be used to start and stop Goldengate as well as relocate Goldengate resources between nodes in the cluster.

Download the latest version of the agent (6.1) from the URL below:

http://www.oracle.com/technetwork/database/database-technologies/clusterware/downloads/index.html

The downloaded file will be xagpack_6.zip.

There is an xag/bin directory with the agctl executable already existing in the $GRID_HOME root directory.

We need to install the new bundled agent in a separate directory and ensure the $PATH includes [{–nodes <node1,node2[,…]> | –all_nodes}]

Register Goldengate with the bundled agents using agctl utility

Using agctl utility create the GoldenGate configuration.

Ensure that we are running agctl from the downloaded bundled agent directory and not from the $GRID_HOME/xag/bin directory or ensure that the $PATH variable has been amended as described earlier.

/home/oracle/xagent/bin/agctl add goldengate gg_source --gg_home /u03/app/oracle/goldengate \
--instance_type source \
--nodes rac1,rac2 \
--vip_name gg_vip_source \
--filesystems dbfs_mount --databases ora.orcl.db \
--oracle_home /u02/app/oracle/product/12.1.0/dbhome_1 \
--monitor_extracts ext1,extdp1
 

Once GoldenGate is registered with the bundled agent, we should only use agctl to start and stop Goldengate processes. The agctl command will start the Manager process which in turn will start the other processes like Extract, Data Pump and Replicat if we have configured them for automatic restart.

Let us look at some examples of using agctl.

Check the Status – note the DBFS filesystem is also mounted currently on node rac2

$ pwd
/home/oracle/xagent/bin
$ ./agctl status goldengate gg_source
Goldengate  instance 'gg_source' is running on rac2


$ cd /mnt/dbfs/
$ ls -lrt
total 0
drwxrwxrwx 9 root root 0 May 16 15:37 gg_source

Stop the Goldengate environment

$ ./agctl stop goldengate gg_source 
$ ./agctl status goldengate gg_source
Goldengate  instance ' gg_source ' is not running

GGSCI (rac2.localdomain) 1> info all

Program     Status      Group       Lag at Chkpt  Time Since Chkpt

MANAGER     STOPPED
EXTRACT     STOPPED     EXT1        00:00:03      00:01:19
EXTRACT     STOPPED     EXTDP1      00:00:00      00:01:18

Start the Goldengate environment – note the resource has relocated to node rac1 from rac2 and the Goldengate processes on rac2 have been stopped and started on node rac1.

$ ./agctl start goldengate gg_source
$ ./agctl status goldengate gg_source
Goldengate  instance 'gg_source' is running on rac1

GGSCI (rac2.localdomain) 2> info all

Program     Status      Group       Lag at Chkpt  Time Since Chkpt
MANAGER     STOPPED

GGSCI (rac1.localdomain) 1> info all

Program     Status      Group       Lag at Chkpt  Time Since Chkpt
MANAGER     RUNNING
EXTRACT     RUNNING     EXT1        00:00:09      00:00:06
EXTRACT     RUNNING     EXTDP1      00:00:00      00:05:22

We can also see that the agctl has unmounted DBFS on rac2 and mounted it on rac1 automatically.

[oracle@rac1 goldengate]$ ls -l /mnt/dbfs
total 0
drwxrwxrwx 9 root root 0 May 16 15:37 gg_source

[oracle@rac2 goldengate]$ ls -l /mnt/dbfs
total 0

Lets test the whole thing!!

Now that we see that the Goldengate resources are running on node rac1, let us see what happens when we reboot that node to simulate a node failure when Goldengate is up and running and the Extract and Data Pump processes are running on the source.

AGCTL and Cluster Services will relocate all the Goldengate resources, VIP, DBFS to the other node seamlessly and we see that the Extract and Data Pump processes have been automatically started up on node rac2.

[oracle@rac1 goldengate]$ su -
Password:
[root@rac1 ~]# shutdown -h now

Broadcast message from oracle@rac1.localdomain
[root@rac1 ~]#  (/dev/pts/0) at 19:45 ...

The system is going down for halt NOW!

Connect to the surviving node rac2 and check ……

[oracle@rac2 bin]$ ./agctl status goldengate gg_source
Goldengate  instance 'gg_source' is running on rac2

GGSCI (rac2.localdomain) 1> info all

Program     Status      Group       Lag at Chkpt  Time Since Chkpt

MANAGER     RUNNING
EXTRACT     RUNNING     EXT1        00:00:07      00:00:02
EXTRACT     RUNNING     EXTDP1      00:00:00      00:00:08

Check the Cluster Resource ….

oracle@rac2 bin]$ crsctl stat res dbfs_mount -t
--------------------------------------------------------------------------------
Name           Target  State        Server                   State details
--------------------------------------------------------------------------------
Cluster Resources
--------------------------------------------------------------------------------
dbfs_mount
      1        ONLINE  ONLINE       rac2                     STABLE
--------------------------------------------------------------------------------

Oracle GoldenGate Notes

See individual products notes for individual links:
888828.1
 Note 965230.1 How to Find GoldenGate on edelivery.oracle.com
Note 970860.1 How To Apply Oracle GoldenGate Patches
Note 965394.1 Installing GoldenGate Code Into An Existing Subvolume
<< Note 966215.1>>  Implementing Logger Upgrades With Minimal Operational Intrusion
<< Note 1060867.1>>  How To Upgrade A Single Component In GoldenGate Version 10.0
Note 965683.1 How To Configure For Multiple Instances Of GoldenGate On One Himalaya System
Note 965360.1 Running Multiple GoldenGate Environments On NonStop
Note 968632.1 Does GoldenGate Support Installation Of Its Product On A Shared Disk Subsystem In A Clustered Environment?
Note: 966181.1  Installing GoldenGate For Oracle RAC
Note 969651.1 ORA-12705: Invalid Or Unknown NLS Parameter Value Specified.
Note 1060596.1 Unable To Determine The Application And Database Codepage Settings
Note 965278.1  How To Create a GLOBALS Parameter on Windows, MVS, or Unix
Note 965754.1 Moving A GoldenGate Installation Instead Of Downloading It On Tandem

 

GoldenGate Integrated Capture

GG Integrated Capture

Architecting GoldenGate

Binaries consume approx 600MB

Each process consumes about 50MB of memory this can quickly consume a lot of memory

Base processing will consume

Manager process, extract, pump, replicat which at the base is about 200MB

Each process assumes 1 CPU core

GoldenGate requires a number of TCP/IP ports in order to operate. It is important that your network firewall is allowed to pass traffic on these ports. One port is used solely for communication between the Manager process and other GoldenGate processes. This is normally set to port 7809 but it can be changed. A range of other ports are for local GoldenGate communications. These can be the default range, starting at port 7840 or a predefined range of up to 256 other ports.

Oracle recommends at least 256 GB of space per Extract process for the dirtmp subdirectory.

 

Administering GoldenGate Doc

Sample configuration for handling collisions

Customizing GoldenGate Processing

Using “EXITS” to customize GoldenGate processing

Architecture Plans

Maintain Live Standby w/GoldenGate

 

 

Golden Gate General Info

This is Oracle’s main page for GoldenGate

GoldenGate Main Page Oracle

This page also contains information regarding Oracle Cloud Marketplace

GoldenGate downloads are available here

GoldenGate Downloads

GoldenGate Documentation is available here

GoldenGate Documentation

12.3.1.1.1 for Big Data

12.2.0.2.2 for Linux

GoldenGate 12.3 Announcement

GoldenGate 12.3 Documentation

12.3.1.1 Features

12.3 Download

GoldenGate Documentation

GoldenGate 12c (12.1.2)Documentation

GoldenGate Documentation

GoldenGate DBFS Installation

Oracle GoldenGate Blog

Oracle GoldenGate Best Practices: Heartbeat Table for Monitoring Lag times (Doc ID 1299679.1)

Integrated Capture

The mining database, from which the primary Extract captures log change records from the logmining server, can be either local or downstream from the source database.

These steps configure the primary Extract to capture transaction data in integrated mode from either location.

See Appendix B, “Configuring a Downstream Mining Database” and Appendix C, “Example Downstream Mining Configuration” for more information about capturing from a downstream mining database.

 

 

 

Basically every download of GoldenGate is a ‘full’ install.

Extract the file in a directory, run the “ggsci” executable in that directory,

type “Create SubDirs” at the command prompt and you’re done

If you want to ‘patch’ GoldenGate, you could extract the ‘patch’ over the old version of GoldenGate. In general this works very well, but realize if you are using the Management Pack for GoldenGate (which works with Enterprise Manager 12c Cloud Control), you’ll want to save a copy of your CONFIG.PROPERTIES file (it’s in the cfg directory) before you do this. Typically that’s going to be the only file that would get ‘overwritten’ during the patch install that you’d actually be concerned about. Everything else you’ll WANT to be overwritten during the ‘patch’ install.

Remember, it’s not a bad idea to back everything up before you do this.

At least between 25 and 55 Mb of RAM memory is required for each GoldenGate Replicat and Extract process.Each GoldenGate instance can support up to 300 (in new release it has increased up to 5000) concurrent Extract and Replicat processes (inclusive). but have enough system resourcesavailable for the OS.

The best way to assess total memory requirement is to run the GGSCI command to view the current report file and to examine the PROCESS AVAIL VM FROM OS (min) to determine if you have sufficient swap memory for your platform.

GoldenGate will typically use only 5% of a systems CPU resource. Modern Operating Systems can share available resources very efficiently; It is important however to size your requirements effectively, obtaining a balance between the maximum possible number of concurrent processes and number of CPUs. GoldenGate will use 1 CPU core per Extract or Replicat process.

For more details refer GoldenGate installation and admin guides.