Increasing the TCP/IP Packet Size

Use the TCPBUFSIZE option of the RMTHOST parameter to control the size of the TCP socket buffer that Extract maintains. By increasing the size of the buffer, you can send larger packets to the target system. See Parameters and Functions Reference for Oracle GoldenGate for more information.

Use the following steps as a guideline to determine the optimum buffer size for your network.

Use the ping command from the command shell obtain the average round trip time (RTT), shown in the following example:

C:\home\ggs>ping ggsoftware.com
Pinging ggsoftware.com [192.168.116.171] with 32 bytes of data:
Reply from 192.168.116.171: bytes=32 time=31ms TTL=56
Reply from 192.168.116.171: bytes=32 time=61ms TTL=56
Reply from 192.168.116.171: bytes=32 time=32ms TTL=56
Reply from 192.168.116.171: bytes=32 time=34ms TTL=56
Ping statistics for 192.168.116.171:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 31ms, Maximum = 61ms, Average = 39ms

Multiply that value by the network bandwidth. For example, if average RTT is .08 seconds, and the bandwidth is 100 megabits per second, then the optimum buffer size is:
```
0.08 second * 100 megabits per second = 8 megabits
```
Divide the result by 8 to determine the number of bytes (8 bits to a byte). For example:
```
8 megabits / 8 = 1 megabyte per second
```
The required unit for TCPBUFSIZE is bytes, so you would set it to a value of 1000000.

The maximum socket buffer size for non-Windows systems is usually limited by default. Ask your system administrator to increase the default value on the source and target systems so that Oracle GoldenGate can increase the buffer size configured with TCPBUFSIZE.