Buffering

"rdisp/bufreftime" defines the length of the interval in seconds.

1)Full buffering

When a record of the table is accessed, all the records of the table are loaded into the buffer.

2)Generic buffering

The generic key is a left-justified part of the primary key of the table that must be defined when the buffering type is selected.Client-dependent, fully buffered tables are automatically generically buffered.

3)Single-record buffering

All the accesses to the table that do not use SELECT SINGLE bypass the buffer and directly access the database.If the table does not contain a record with specified key, this record is recorded in the buffer as non-exist.