Hello,
On 12c database, the alert.log file shows the following message:
“Using deprecated SQLNET.ALLOWED_LOGON_VERSION parameter”. The Database is reporting these messages because the “SQLNET.ALLOWED_LOGON_VERSION” parameter is no longer valid (with 12c).
The SQLNET.ALLOWED_LOGON_VERSION parameter is deprecated in Oracle Database 12c.
This parameter has been replaced with two new Oracle Net Services parameters:
SQLNET.ALLOWED_LOGON_VERSION_SERVER
SQLNET.ALLOWED_LOGON_VERSION_CLIENT
In order to suppress these messages in the alert log of the database, you need to use the new parameters for the 12c database.
STEPS:
1. Edit the sqlnet.ora file of the 12c database. (This needs be done on each database on 12c). So for example if both your EBS and CCG databases are on 12c, you need to do this on each sqlnet.ora file. Typically, the sqlnet.ora file that would be referenced by the database is located in RDBMS_HOME/network/admin
2. Remove or comment the following entry.
SQLNET.ALLOWED_LOGON_VERSION
3.You need to follow the instructions below:
3a. Add the following two new Oracle Net Services parameters:
SQLNET.ALLOWED_LOGON_VERSION_SERVER = n
SQLNET.ALLOWED_LOGON_VERSION_CLIENT = n
Specify the value for ‘n’ based on your own environment. The default setting for the new parameters is 11. Any client that attempts to connect must be at version 11 or higher unless these parameters are explicitly set in the server side sqlnet.ora file.
3b. For example: Set these parameters at the lowest version level that is required in your environment.
The example shpow below shows the following: All clients at version 10 or higher would require this setting:
SQLNET.ALLOWED_LOGON_VERSION_SERVER=10
SQLNET.ALLOWED_LOGON_VERSION_CLIENT=10
3c. Note that SQLNET.ALLOWED_LOGON_VERSION_CLIENT would be necessary on the server when the database is ‘acting’ as a client. Such as the case of a database link as in the case of CCG applications.
Talip Hakan Ozturk's ORACLE BLOG 