DDL of all tablespaces

set heading off;
set echo off;
Set pages 999;
set long 90000;
spool ddl_tablespace.sql
select dbms_metadata.get_ddl('TABLESPACE',tb.tablespace_name) from dba_tablespaces tb;
spool off

Get DDL of all privileges granted to user

set feedback off pages 0 long 900000 lines 20000 pagesize 20000 serveroutput on
accept USERNAME prompt "Enter username :"
--This line add a semicolon at the end of each statement
execute dbms_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM,'SQLTERMINATOR',true);
-- This will generate the DDL for the user and add his objects,system and role grants
SELECT DBMS_METADATA.GET_DDL('USER',username) as script from DBA_USERS where username='&username'
UNION ALL
SELECT DBMS_METADATA.GET_GRANTED_DDL('SYSTEM_GRANT',grantee)as script from DBA_SYS_PRIVS where grantee='&username' and rownum=1
UNION ALL
SELECT DBMS_METADATA.GET_GRANTED_DDL('ROLE_GRANT',grantee)as script from DBA_ROLE_PRIVS where grantee='&username' and rownum=1
UNION ALL
SELECT DBMS_METADATA.GET_GRANTED_DDL('OBJECT_GRANT',grantee)as script from DBA_TAB_PRIVS where grantee='&username' and rownum=1;

size of the database

col "Database Size" format a20
col "Free space" format a20
col "Used space" format a20
select round(sum(used.bytes) / 1024 / 1024 / 1024 ) || ' GB' "Database Size"
, round(sum(used.bytes) / 1024 / 1024 / 1024 ) -
round(free.p / 1024 / 1024 / 1024) || ' GB' "Used space"
, round(free.p / 1024 / 1024 / 1024) || ' GB' "Free space"
from (select bytes from v$datafile union all
select bytes from v$tempfile union all select bytes
from v$log) used , (select sum(bytes) as p from dba_free_space) free group by free.p;

Hidden Parameter

Set lines 2000
col NAME for a45
col DESCRIPTION for a100
SELECT name,description from SYS.V$PARAMETER WHERE name LIKE '\_%' ESCAPE '\'

Database uptime

select to_char(startup_time, 'DD-MM-YYYY HH24:MI:SS'),floor(sysdate-startup_time) DAYS from v$Instance;

Installed RDBMS components

col comp_id for a10
col comp_name for a56
col version for a12
col status for a10
set pagesize 200
set lines 200
set long 999
select comp_id,comp_name,version,status from dba_registry;

Installed sqlpatches in db

--- From 12c onwardset lines 2000
select patch_id,status,description from dba_registry_sqlpatch;

--- For 11g and below:set lines 2000
select * from dba_registry_history;

Characterset info of database

set pagesize 200
set lines 200
select parameter,value from v$nls_parameters where parameter like 'NLS_%CHAR%';

Database incarnation info

set heading off
set feedback off
select 'Incarnation Destination Configuration' from dual;
select '*************************************' from dual;
set heading on
set feedback on

select INCARNATION# INC#, RESETLOGS_CHANGE# RS_CHANGE#, RESETLOGS_TIME,
PRIOR_RESETLOGS_CHANGE# PRIOR_RS_CHANGE#, STATUS,
FLASHBACK_DATABASE_ALLOWED FB_OK from v$database_incarnation;

timezone info in db

SELECT version FROM v$timezone_file;

SELECT PROPERTY_NAME, SUBSTR(property_value, 1, 30) value
FROM DATABASE_PROPERTIES WHERE PROPERTY_NAME LIKE 'DST_%' ORDER BY PROPERTY_NAME;

View/modify AWR retention

-- Check the current moving window baseline size:

select BASELINE_TYPE,MOVING_WINDOW_SIZE from dba_hist_baseline;

-- Modify window_size to (7 days):

execute dbms_workload_repository.modify_baseline_window_size(window_size=> 7);

cpu & memory info of db server

set pagesize 200
set lines 200
col name for a21
col stat_name for a25
col value for a13
col comments for a56
select STAT_NAME,to_char(VALUE) as VALUE ,COMMENTS from v$osstat where
stat_name IN ('NUM_CPUS','NUM_CPU_CORES','NUM_CPU_SOCKETS')
union
select STAT_NAME,VALUE/1024/1024/1024 || ' GB' ,COMMENTS from
v$osstat where stat_name IN ('PHYSICAL_MEMORY_BYTES');