SQL Developer is a good tool for creating queries, but you should be using SQLPlus when trying to time queries. If you don’t already have SQLPlus installed you can get it from Oracle:
You want Oracle Database 11g Release 2 Client (188.8.131.52.0) for Linux x86-64. Unizip the client in your home directory.
Make sure you have the following environment variables defined:
# these point to wherever you have Oracle installed
If you plan to run PL/SQL DDL/DML scripts, you’ll also need a SQLPATH environment variable which points to a directory where you keep the scripts.
If you don’t already have your database defined in your /etc/tnsnames.ora file (assuming you’re using that path and not something under /home/oracle), you’ll need to add the following TNS configuration:
(ADDRESS = (PROTOCOL = TCP)(HOST = dbhost)(PORT = 1521))
(SERVICE_NAME = dbname)
To run SQLPlus against your database as a specific user, use the following command line:
Enter the password when prompted and you’ll now be at the SQL> prompt.
To get script timings, enter the PL/SQL command:
SET TIMING ON