64 bit Operating System

Can i use PlSql Developer on 64 operating system.
When i install it and logon database, "Database" list is empty, but i have a few TNS services.
 
You will need to install a 32 Bit Oracle Client. PL/SQL Developer is a 32 Bit application, so it cannot interface with a 64 Bit Oracle Client.

The 32 Bit Oracle Client can communicate with a 64 Bit Server, even on the same machine if necessary. The 32 Bit client can coexist with a 64 Bit Oracle installation when installed in separate Oracle Home directories.
 
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