我一般都是将 CONTROL_FILE_RECORD_KEEP_TIME 参数设置成20天。
CONTROL_FILE_RECORD_KEEP_TIMEProperty Description
Parameter type Integer
Default value 7 (days)
Modifiable ALTER SYSTEM
Range of values 0 to 365 (days)
Basic No
CONTROL_FILE_RECORD_KEEP_TIME specifies the minimum number of days before a reusable record in the control file can be reused. In the event a new record needs to be added to a reusable section and the oldest record has not aged enough, the record section expands. If this parameter is set to 0, then reusable sections never expand, and records are reused as needed.
If the number of reusable records in the control file exceeds the circular reuse record limit UB4MAXVAL, then reusable records will be overwritten even if CONTROL_FILE_RECORD_KEEP_TIME has not elapsed. UB4MAXVAL is defined in the oratypes.h header file, which is found in the public directory. Its value may vary according to the operating system you are using.
Note:
This parameter applies only to records in the control file that are circularly reusable (such as archive log records and various backup records). It does not apply to records such as datafile, tablespace, and redo thread records, which are never reused unless the corresponding object is dropped from the tablespace.
http://download.oracle.com/docs/ ... s034.htm#REFRN10020
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