Generate tablespace usage trend / growth.

Hi

The script mention below generates tablespace usage trend/growth.

This is useful to understand when we deal with TEMP / UNDO tablespace peak usage.

It creates a spool file as excel sheet format (.xls), which helps to create graph for reporting purpose as a business standpoint.
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SET MARKUP HTML ON ENTMAP ON SPOOL ON PREFORMAT OFF;
set linesize 125
set numwidth 20
set pagesize 50
COL NAME FOR A30
col SNAP_ID for 9999999
set serveroutput off;
SPOOL TBS_TREND.xls;
set verify off;
set echo off;

SELECT
distinct DHSS.SNAP_ID,VTS.NAME,
TO_CHAR(DHSS.END_INTERVAL_TIME, 'DD-MM HH:MI') AS SNAP_Time,
ROUND((DHTS.TABLESPACE_USEDSIZE*8192)/1024/1024)/&&max_instance_num AS USED_MB,
ROUND((DHTS.TABLESPACE_SIZE*8192)/1024/1024)/&&max_instance_num AS SIZE_MB
FROM DBA_HIST_TBSPC_SPACE_USAGE DHTS,V$TABLESPACE VTS,DBA_HIST_SNAPSHOT DHSS
WHERE VTS.TS#=DHTS.TABLESPACE_ID
AND DHTS.SNAP_ID=DHSS.SNAP_ID
AND DHSS.INSTANCE_NUMBER=1
AND TABLESPACE_ID=&id
ORDER BY 1;
SPOOL OFF;
EXIT;