UNIX S-TAP cannot start: buffer size too large

If a UNIX S-TAP® cannot start, its buffer size might be too large.

Symptoms

The S-TAP cannot start and issues the following messages:

mmap: Not enough space
Can't initialize: Can't mmap buffer file /tmp/stapbuf/192.168.100.107.0.buf
Error Initializing: Stap cannot initialize SQLGuard queue

Causes

The S-TAP is unable to allocate enough memory to match the buffer file.

Resolving the problem

Reduce the buffer file size for the S-TAP. The size is specified in the buffer_file_size parameter in the guard_tap.ini file.

You can also use the following formula to calculate the total memory that is used by the S-TAP buffers:

number of sqlguard main connections * buffer_file_size

For example, if you have 3 connections and buffer_file_size is set to 1 GB, then you need a total of 3 GB of memory for S-TAP buffers (3 *1GB = 3GB).