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Oracle 10g Improved Network Outage Detection

sqlnet.send_buf_size – This parameter is used to specify the buffer space size for send operations of ORACLE*Net sessions.

sqlnet.recv_buf_size  – This parameter is used to specify the buffer size for receive operations of ORACLE*Net sessions.

Modern, reliable network protocols like TCP/IP place data packets into send and receive buffers when sending and receiving data packets from the upper and lower protocol layers. It should be obvious that the sizes of these buffers can have a dramatic effect on network performance, since these buffer sizes influence flow control decisions. To guarantee a continuous flow of data and to provide for a better utilization of network bandwidth, you should specify the I/O buffer space settings for send and receive operations of ORACLE*Net sessions with the recv_buf_size and send_buf_size parameters.

As a guideline, the value of these parameters should be set as a multiple of the SDU size plus 26, and N is a constant based on the average number of sends and receives:


For example, if the SDU size is 2920 and you need a multiple of four, then specify a size of 11384 bytes. To determine the average number of sends and receives, use client and server trace files, then analyze them using the tracasst utility with the -s option.

Oracle Corporation recommends that these parameters be set on both sides of a connection. Generally speaking, ensure that the send_buf_size parameter at the source is equal to the recv_buf_size parameter at the target.

The recv_buf_size and send_buf_size parameters are supported by the following protocols:

  • TCP/IP

  • TCP/IP with SSL,

  • SDP

You may find that other protocols support these parameters on certain operating systems. To verify that they are supported on your protocol, refer to operating-system specific documentation for information.

Get the complete story:

The above text is an excerpt from "Oracle Database 10g New Features: Reference for Advanced Tuning and Administration", by Rampant TechPress.  Written by top Oracle experts, this book has a complete online code deport with ready to use scripts. 

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