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Answer Posted / shreeshaildiggi
SAP buffering :
Buffering of data from database tables defined in a table
buffer in the shared memory of the current application
server. The definition determines whether and how a
database table is buffered. Buffering generally leads to
greatly enhanced performance (by a factor of between 50 and
500) and is administrated by the database interface.
Buffering usually becomes effective when Open SQL commands
are used for database access. However, some variants do not
use the buffering process.
The following Open SQL statements implicitly bypass the SAP
buffer and access the database tables directly:
SELECT with the addition FOR UPDATE,
Access to a table using single-record buffering without
selecting a single record using SINGLE SELECT or by
specifying the primary key in the WHERE condition (this
behavior depends on the current implementation of the
database interface and may be different in future
releases).
SELECT with the addition DISTINCT,
SELECT with aggregate expressions,
Open SQL statement with the addition CLIENT SPECIFIED,
without specification of the client ID in a WHERE
condition,
SELECT with JOIN expressions
Access to a generically buffered area without full
specification in a WHERE condition
Open SQL statements with IS [NOT] NULL in the additions
WHERE and HAVING,
Use of a subquery in a WHERE condition,
SELECT with the addition GROUP BY,
SELECT with the addition ORDER BY, whereby the sort key is
not the primary key.
Thanks and Regards
SHREESHAIL DIGGI
SAP Technical Consultant Infinite India
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