ORA file, which will give you additional options when creating connections to a database. ORA file. This makes it easier to manage. Hi Leo, is your database running? Is the name of the database the same as the one used in the connection box? The second question, how does Oracle search through the tnsnames file, from the top down or from the bottom up again, this is related to duplicate entries using the same alias?
I could test it to see what happens! In windows you can find tnsnames. Thank you. I have one query, i need to take tnsnames. How can i do that. I need to do this as i am getting access denied message when i take tnsname.
Fantastic article that explains the function and syntax of the tnsnames. ORA it will work. But i dont understand how to use it all. Pls help. Your email address will not be published. Notify me of follow-up comments by email. Notify me of new posts by email. This site uses Akismet to reduce spam. Learn how your comment data is processed. ORA file? ORA File Located? If the file is not found in this directory, it is assumed the file does not exist.
You may need to create one. To start, open the Control Panel. Then, open System. Click on Advanced System Settings, on the left. Type regedit and press Enter. These parameters are described in this section.
The protocol address section of the tnsnames. To allow the caller to detect a terminated remote server, typically it takes 2 hours or more to notice.
Operating system TCP configurables, which vary by platform, define the actual keepalive timing details. When you set the parameter to on , yes , or true , Oracle Net fails over at connect time to a different address if the first protocol address fails.
When you set the parameter to off , no , or false , Oracle Net tries one protocol address. When you set the parameter to on , yes , or true , Oracle Net goes through the list of addresses in a random sequence, balancing the load on the various listener or Oracle Connection Manager protocol addresses. When you set the parameter to off , no , or false , Oracle Net tries the protocol addresses sequentially until one succeeds. The default value for this parameter is specific to the operating system.
The default for the Linux 2. To instruct Oracle Net to optimize the transfer rate of data packets being sent across the network with a specified session data unit SDU size. The default value for this parameter is operating system specific. When you set this parameter to on or yes , Oracle Net uses each address in order until the destination is reached.
To use Oracle Connection Manager, an initial connection from the client to Oracle Connection Manager is required, and a second connection from Oracle Connection Manager to the listener is required. This parameter should only be used if the application supports both an Oracle Rdb and Oracle database service, and you want the application to load balance between the two. The connection data section of the tnsnames. The following parameters are available:. To instruct Oracle Net to fail over to a different listener if the first listener fails during run time.
Depending upon the configuration, the session or any SELECT statements which were in progress are automatically failed over. A separate net service name must be created for the failover node. TYPE : Specifies the type of failover. For example, if a user's connection is lost, then a new session is automatically created for the user on the backup. This type of failover does not attempt to recover selects.
However, this mode involves overhead on the client side in normal select operations. NONE : This is the default, in which no failover functionality is used. This can also be explicitly specified to prevent failover from happening. This option requires almost no work on the backup database server until failover time. This provides faster failover but requires that the backup instance be able to support all connections from every supported instance. To direct the listener to connect the client to a specific type of service handler.
Shared server must be configured in the database initialization file in order for the client to connect to the database with a shared server process. The security section of the tnsnames. To enable secure connections. To specify the distinguished name DN of the database server. The client uses this information to obtain the list of DNs it expects for each of the servers, enforcing the database server DN to match its service name. Use this parameter with the sqlnet.
The timeout section of the tnsnames. To specify the timeout duration in seconds for a client to establish an Oracle Net connection to an Oracle database. It includes the time to be connected to the database instance providing the requested service, not just the duration of the TCP connection.
To specify the delay in seconds between subsequent retries for a connection. To specify the transportation timeout duration in seconds for a client to establish an Oracle Net connection to an Oracle database. The default value is 60 seconds. The compression section of the tnsnames. The compression levels are used at the time of negotiation to verify which levels are used at both ends, and select one level.
General Syntax of tnsnames. Multiple Descriptions in tnsnames. Notes: Oracle Net Manager does not support the creation of multiple connect descriptors for a net service name when using Oracle Connection Manager. Multiple Address Lists in tnsnames. Note: Oracle Net Manager supports only the creation of one protocol address list for a connect descriptor. Protocol Address Section The protocol address section of the tnsnames.
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