web server - Borland Technical Publications

Defining the Connection Pool Properties for a JDBC Datasource
Table 22.1
refreshFrequency Integer Using dbPingSQL, this property
specifies a timeout, in seconds, for
each connection in an idle state.
Once the timeout expires, the
connection is examined to
determine if it is still a valid
connection. All idle connections
are checked for refreshFrequency at
sixty second intervals.
dbPingSQL String Specifies an SQL statement used
to validate open connections
present in the connection pool and
to refresh connections during a
refreshFrequency timeout.
resSharingScope
Connection Pool Properties for a JDBC Datasource (continued)
Name Allowed Values Description Default Value
Enumerated:
■
■
Shareable
Unshareable
Indicates whether connection
statements and result sets are
cached for reuse. If set to
Shareable, connection statements
and results sets are cached,
thereby optimizing throughput of
connections. If set to Unshareable,
connections are closed once the
application closes the connection.
300 (five
minutes)
Not defined.
When no
SQL is
specified, the
container
uses
java.sql.Conne
ctionisClosed(
) method to
validate the
connection.
Shareable
Chapter 22: Using JDBC 201