The ECHO setting tells SQL*Plus whether you want the contents of script files to be echoed to the screen as they are executed.

What is set verify on in Oracle?

The SET VERIFY Command To confirm the changes in the SQL statement, use the SQL*Plus SET VERIFY command. Setting SETVERIFY ON forces SQL*Plus to display the text of a command before and after it replaces substitution variables with values.

What is set Pagesize in Oracle?

The PAGESIZE setting tells SQL*Plus the number of printed lines that will fit on one page of output. You can also use this setting to completely turn off all pagination functions.