oracle headroom检测（sql和scnhealthcheck.sql）

declare
  compat number := 1;
  rsl number;
  headroom_in_scn number;
  headroom_in_sec number;
  var boolean;
begin
 var:=dbms_scn.GetSCNParamsByCompat(compat,rsl,headroom_in_scn,headroom_in_sec);
  dbms_output.put_line('compat=' ||compat);
  dbms_output.put_line('rsl=' ||rsl);
 dbms_output.put_line('headroom_in_scn=' || headroom_in_scn);
 dbms_output.put_line('headroom_in_sec=' || headroom_in_sec);
 dbms_output.put_line('headroom_in_day=' || headroom_in_sec/(60*60*24));
 dbms_output.put_line('headroom_in_scn/sec=' || headroom_in_scn/headroom_in_sec);
end;

/





rem [root@dg-p u01]# cat scnhealthcheck.sql
set	echo	off
set	head	off
set	verify	off	
set	linesize	1000
spool	&1\&1-&2.log
prompt &2-&3-&4

Rem
Rem $Header: rdbms/admin/scnhealthcheck.sql apfwkr_blr_backport_13498243_12.1.0.2.0/1 2015/05/26 22:44:51 apfwkr Exp $
Rem
Rem scnhealthcheck.sql
Rem
Rem Copyright (c) 2012, 2015, Oracle and/or its affiliates. 
Rem All rights reserved.
Rem
Rem    NAME
Rem      scnhealthcheck.sql - Scn Health check
Rem
Rem    DESCRIPTION
Rem      Checks scn health of a DB
Rem
Rem    NOTES
Rem      .
Rem
Rem    MODIFIED   (MM/DD/YY)
Rem    tbhukya     01/11/12 - Created
Rem
Rem

define LOWTHRESHOLD=10
define MIDTHRESHOLD=62
define VERBOSE=FALSE

set veri off;
set feedback off;

set serverout on
DECLARE
 verbose boolean:=&&VERBOSE;
BEGIN
 For C in (
  select 
   version, 
   date_time,
   dbms_flashback.get_system_change_number current_scn,
   indicator
  from
  (
   select
   version,
   to_char(SYSDATE,'YYYY/MM/DD HH24:MI:SS') DATE_TIME,
   ((((
    ((to_number(to_char(sysdate,'YYYY'))-1988)*12*31*24*60*60) +
    ((to_number(to_char(sysdate,'MM'))-1)*31*24*60*60) +
    (((to_number(to_char(sysdate,'DD'))-1))*24*60*60) +
    (to_number(to_char(sysdate,'HH24'))*60*60) +
    (to_number(to_char(sysdate,'MI'))*60) +
    (to_number(to_char(sysdate,'SS')))
    ) * (16*1024)) - dbms_flashback.get_system_change_number)
   / (16*1024*60*60*24)
   ) indicator
   from v$instance
  ) 
 ) LOOP
  dbms_output.put_line( '-----------------------------------------------------'
                        || '---------' );
  dbms_output.put_line( 'ScnHealthCheck' );
  dbms_output.put_line( '-----------------------------------------------------'
                        || '---------' );
  dbms_output.put_line( 'Current Date: '||C.date_time );
  dbms_output.put_line( 'Current SCN:  '||C.current_scn );
  dbms_output.put_line( 'SCN Headroom: '||round(C.indicator,2) );
  dbms_output.put_line( 'Version:      '||C.version );
  dbms_output.put_line( '-----------------------------------------------------'
                        || '---------' );

  IF C.version > '10.2.0.5.0' and 
     C.version NOT LIKE '9.2%' THEN
    IF C.indicator>&MIDTHRESHOLD THEN 
      dbms_output.put_line('Result: A - SCN Headroom is good');
      dbms_output.put_line('Apply the latest recommended patches');
      dbms_output.put_line('based on your maintenance schedule');
      IF (C.version < '11.2.0.2') THEN
        dbms_output.put_line('AND set _external_scn_rejection_threshold_hours='
                             || '24 after apply.');
      END IF;
    ELSIF C.indicator<=&LOWTHRESHOLD THEN
      dbms_output.put_line('Result: C - SCN Headroom is low');
      dbms_output.put_line('If you have not already done so apply' );
      dbms_output.put_line('the latest recommended patches right now' );
      IF (C.version < '11.2.0.2') THEN
        dbms_output.put_line('set _external_scn_rejection_threshold_hours=24 '
                             || 'after apply');
      END IF;
      dbms_output.put_line('AND contact Oracle support immediately.' );
    ELSE
      dbms_output.put_line('Result: B - SCN Headroom is low');
      dbms_output.put_line('If you have not already done so apply' );
      dbms_output.put_line('the latest recommended patches right now');
      IF (C.version < '11.2.0.2') THEN
        dbms_output.put_line('AND set _external_scn_rejection_threshold_hours='
                             ||'24 after apply.');
      END IF;
    END IF;
  ELSE
    IF C.indicator<=&MIDTHRESHOLD THEN
      dbms_output.put_line('Result: C - SCN Headroom is low');
      dbms_output.put_line('If you have not already done so apply' );
      dbms_output.put_line('the latest recommended patches right now' );
      IF (C.version >= '10.1.0.5.0' and 
          C.version <= '10.2.0.5.0' and 
          C.version NOT LIKE '9.2%') THEN
        dbms_output.put_line(', set _external_scn_rejection_threshold_hours=24'
                             || ' after apply');
      END IF;
      dbms_output.put_line('AND contact Oracle support immediately.' );
    ELSE
      dbms_output.put_line('Result: A - SCN Headroom is good');
      dbms_output.put_line('Apply the latest recommended patches');
      dbms_output.put_line('based on your maintenance schedule ');
      IF (C.version >= '10.1.0.5.0' and
          C.version <= '10.2.0.5.0' and
          C.version NOT LIKE '9.2%') THEN
       dbms_output.put_line('AND set _external_scn_rejection_threshold_hours=24'
                             || ' after apply.');
      END IF;
    END IF;
  END IF;
  dbms_output.put_line(
    'For further information review MOS document id 1393363.1');
  dbms_output.put_line( '-----------------------------------------------------'
                        || '---------' );
 END LOOP;
end;
/
spool	off
exit