Find database size in Oracle

To find database size (GB) in Oracle, use below query.
select round((sum(bytes)/1048576/1024), 2) from v$datafile;

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What need to do when encounter the error ORA-28001: the password has expired

When you encounter the error ORA-28001: the password has expired, execute below queries to resolve this. export ORACLE_SID=< databaseName> sqlplus / as SYSDBA SQL> alter profile default limit password_life_time unlimited; SQL> alter user <userName> identified by <password>; SQL> commit; SQL> exit;

Alter auto extent on existing datafile in Oracle

To alter the existing datafile in Oracle database, use below query. alter database datafile '/u01/app/oracle/oradata/XE/system.dbf' autoextend on maxsize unlimited;

Get all constraints in Oracle

To get all the constraints created in Oracle database, use below query. SELECT * FROM USER_CONSTRAINTS; If you want to get the constraints created for a particular user then use below SQL query. SELECT * FROM USER_CONSTRAINTS where owner = 'userName';

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