windows: c:\> echo $ORACLE_HOME 查看
2 确定你的$ORACLE_HOME\network\admin\listener.ora 是否监听 你目前的instance.
|ORA-12557:||TNS:protocol adapter not loadable|
|Cause:||On some platforms (such as OS/2) protocol adapters are loaded at run-time. If the shared library (or DLL) for the protocol adapter is missing or one of its supporting libraries is missing then this error is returned.|
|Action:||For further details, turn on tracing and reexecute the operation. The trace file will include the name of the shared library (or DLL) that could not be loaded.|
1. Make sure the %ORACLE_HOME%/bin directory is in your PATH.
2. Make sure the protocol is typed/specified correctly in your
tnsnames.ora file or whatever source you're using to resolve service
3. TCP is the default protocol and is installed by default. If
you're using something different (like SPX) make sure you installed the
4. Make sure TOAD is using the correct oracle home if you have
multiple homes installed
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