Can i use safely "ALTER TABLESPACE tablespace_name COALESCE" to free up unused space in any tablespace ( like ununsed extents). Is there any way to find if a tablespace needs to be COALESCED to free up space before we go ahead adding space to tablespace using "ADD DATAFILE" clause? Is there any disadvantange or any other complication using this "COALESCE" command or is it safe enough?
Using SQL Scripts we can save all the SQL queries as files that we use very frequently on our database later point of time. This is one of the feature present under SQL Workshop in Oracle Application Express.
This video shows how to copy a database user from one database to another user DBMS_METADATA. It also shows how to copy a user's permissions and discusses password hash differences between Oracle 10g and 11g.