Oracle database user creation, restart, import and export

--Database user creation process

--a. Create tablespace:

CREATE SMALLFILETABLESPACE "tablespace name"LOGGINGDATAFILE '/home/oracle/app/oradata/tablespace name.dbf' SIZE 1024M AUTOEXTEND ON NEXT 512M MAXSIZE 3048MEXTENT MANAGEMENT LOCAL SEGMENT SPACE MANAGEMENT AUTO;

--b. Create a normal new user

CREATE USER C##username PROFILE DEFAULT IDENTIFIED BY user password DEFAULTTABLESPACE tablespace name TEMPORARYTABLESPACE TEMP ACCOUNT UNLOCK;

--c.Authorization

GRANT CONNECT TO C##username;GRANT RESOURCE TO C##username;GRANT DBA TO C##username WITH ADMIN OPTION;ALTER USER C##username DEFAULT ROLE DBA;alter user C##username quota unlimited on tablespace name;

--d. Remove C## from the username

select user#,name from user$;--- find the user name to be modifiedupdate user$ set name='new user name' where user#=139;commit;

--force refresh

ALTER SYSTEM CHECKPOINT;ALTER SYSTEM FLUSH SHARED_POOL;

--e.Change password

ALTER USER username IDENTIFIED BY password;COMMIT;

--close case limit

ALTER SYSTEM SET SEC_CASE_SENSITIVE_LOGON=FALSE;

--Restart the database

--a.Close

lsnrctl stopsqlplus / as sysdbashutdown immediate;

--b.Start

lsnrctl startsqlplus / as sysdbastartup;

--Database import and export

--use expdp/impdp command

--a. Create dmp file storage path

create directory dump_dir as '/home/oracle/dmp';

--Assign read and write permissions to the user directory

grant read,write on directory dump_dir to userName;

--b.Export

expdp username/password directory=dump_dir dumpfile=name.dmp logfile=name.log schema=username

--c.Import

impdp username/password directory=dump_dir dumpfile=name.dmp logfile=name.log remap_schema=old username:new username remap_tablespace=old tablespace name:new tablespace name