1. Install pl/sql
2. Download instantclient and unzip
2.1 Find oci.dll in the folder
2.2 Do not log in to sql/sql, just go in
2.3 Find configure->preferences
2.4 find connection
2.5 Fill in the decompression path of instantclient in oracle home, and fill in the path of oci.dll in ocl library
2.6 Restart pl/sql.