MAX_DUMP_FILE_SIZE

Property	Description
Parameter type	String
Syntax	`MAX_DUMP_FILE_SIZE = {` `integer` `[K \| M \| G] \| UNLIMITED }`
Default value	`UNLIMITED`
Modifiable	`ALTER SESSION`, `ALTER SYSTEM`
Range of values	0 to unlimited, or `UNLIMITED`
Basic	No

MAX_DUMP_FILE_SIZE specifies the maximum size of trace files (excluding the alert log). Change this limit if you are concerned that trace files may use too much space.

A numeric value for MAX_DUMP_FILE_SIZE specifies the maximum size in operating system blocks.
A numeric value followed by a K or M or G suffix specifies the file size in kilobytes, megabytes, or gigabytes.
The special value string UNLIMITED means that there is no upper limit on trace file size. Thus, dump files can be as large as the operating system permits.

When the trace file is limited in size, it may be automatically split into multiple files, called segments, if needed. The segments will have the same file name as the active trace file, but with an extra segment number appended.

The trace file can be split into a maximum of 5 segments, and the size of each segment will typically be 1/5th of the trace file limit.

When the combined size of all the trace file segments exceeds the specified limit, the oldest segment is deleted, and a new, empty segment is created. Thus, the trace file always contains the most recent trace information.

Note that the first segment is never deleted, because it may contain relevant information about the initial state of the process.