Script to show total RAM used by an instance

Question: What do I query to see the total amount of RAM used by my instance?

Answer:  To see the total RAM (SGA and PGA), you can run this query:

clear breaks
clear computes
clear columns

prompt *******************************************
prompt Get the instance name
prompt ******************************************* 

select instance_name from v$instance;

prompt
prompt ***********************************************
prompt Get cpu_count
prompt ***********************************************

col c1 heading 'CPU|Cores' format a20
col c2 heading 'Size'      format a20

select
   name  c1,
   value c2
from
   v$parameter
where
   name like '%cpu_count%';

prompt
prompt ***********************************************
prompt Get SGA size from v$sga
prompt ***********************************************

col c1 heading 'Pool|Name' format a20
col c2 heading 'Size'      format 999,999,999

select
   name  c1,
   value c2
from
   v$sga;

select
   sum(value) c2
from
   v$sga;

prompt
prompt ***********************************************
prompt Get RAM size if using manual pools
prompt ***********************************************

col c1 heading 'Pool|Name' format a20
col c2 heading 'Size'      format a20

select
   name  c1,
   value c2
from
   v$parameter
where
   (name like '%pool_size%'
or
    name like '%cache_size%')
and
   value is not null
and
   value <> '0';

prompt
prompt ***********************************************
prompt Get RAM size if using AMM
prompt ***********************************************

col c1 heading 'Pool|Name' format a20
col c2 heading 'Size'      format 999,999,999

select
   name  c1,
   to_number(value) c2
from
   v$parameter
where
   name like '%target'
and
   (name like 'memory%'
or
   name like 'sga%')
and
   value is not null
and
   value <> '0';

prompt
prompt ***********************************************
prompt Get PGA high water mark
prompt ***********************************************

col c1 heading 'PGA|Stat'  format a40
col c2 heading 'Size'      format 999,999,999

select
   name  c1,
   value c2
from
   v$pgastat
where
   name like ('maximum%');

 

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