unix/linux搜寻tnsnames.ora规则
Oracle Net Services configuration files are typically, but not always, located in the $ORACLE_HOME/network/admin directory. Depending on the type of file, Oracle Net uses a different search order to locate the file.
The search order for the sqlnet.ora and ldap.ora files is as follows:
1. The directory specified by the TNS_ADMIN environment variable, if this environment variable is set
2. The $ORACLE_HOME/network/admin directory
The search order for the cman.ora, listener.ora, and tnsnames.ora files is as follows:
1. The directory specified by the TNS_ADMIN environment variable, if this environment variable is set
2. One of the following directories:
o On Solaris:
o /var/opt/oracle
o On other platforms:
o /etc
3. The $ORACLE_HOME/network/admin directory
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