Progress Sonic ESB Configuration and Management Guide
Progress Sonic ESB Configuration and Management Guide
Progress Sonic ESB Configuration and Management Guide
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Chapter 5: Using the Database Service JDBC Drivers<br />
In this example, it is probable that at least one connection attempt will succeed, but if no<br />
connection attempt succeeds, the driver can retry each database server (primary <strong>and</strong><br />
alternates) for a specified number of attempts. The JDBC drivers allow you to customize<br />
the connection retry feature to specify the number of attempts that are made.<br />
A JDBC driver fails over to the next alternate database server only if a successful<br />
connection cannot be established with the current alternate server. If the driver<br />
successfully establishes communication with a database server <strong>and</strong> the connection request<br />
is rejected by the database server because the login information is invalid, for example,<br />
the driver does not try to connect to the next database server in the list <strong>and</strong> generates an<br />
exception.<br />
Connection failover provides protection for new connections only <strong>and</strong> does not preserve<br />
states for transactions or queries.<br />
To use connection failover, see the appropriate section for your database for a list of<br />
property=value pairs to add to your connection URL:<br />
● “<strong>Progress</strong> OpenEdge Connection Failover Properties” on page 144<br />
● “DB2 Driver Connection Failover Properties” on page 161<br />
● “Informix Driver Connection Failover Properties” on page 172<br />
● “Oracle Driver Connection Failover Properties” on page 186<br />
● “Microsoft SQL Server Driver Connection Failover Properties” on page 200<br />
● “Sybase Driver Connection Failover Properties” on page 213<br />
Connection Retry<br />
Connection retry allows the JDBC driver to retry connections to a list of database servers<br />
(primary <strong>and</strong> alternate) until a successful connection is established. Use the<br />
ConnectionRetryCount <strong>and</strong> ConnectionRetryDelay properties to enable <strong>and</strong> control how<br />
connection retry works.<br />
In the following examples for the different JDBC drivers, if a successful connection is not<br />
established on the driver’s first pass through the list of database servers (primary <strong>and</strong><br />
alternate), the driver retries the list of servers in the same sequence twice<br />
(ConnectionRetryCount=2). If a successful connection is not established on the first retry<br />
pass through the list of servers, the driver makes another pass through the list of servers.<br />
Because the connection retry delay has been set to five seconds<br />
(ConnectionRetryDelay=5), the driver waits five seconds between retry passes.<br />
133 <strong>Progress</strong> <strong>Sonic</strong> <strong>ESB</strong> <strong>Configuration</strong> <strong>and</strong> <strong>Management</strong> <strong>Guide</strong> 8.5
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