DBA SGA+PGA Memory Configuration

Description

Categories: Enginatics, Toolkit - DBA
Repository: Github

Current SGA and PGA memory configuration in gigabytes.

A frequent configuration problem is not making full use of the available hardware resources, especially the physical RAM of the database server.
This report shows the servers SGA, PGA and CPU configuration in comparison to the available hardware.
For maximum performance, configure the SGA+PGA to use the full available memory of your server minus a few gig for OS level caching, e.g. for writing and reading of PLSQL output files on the DB node and for process memory (an estimated 4MB per process, see below).

Oracle's performance tuning guide:
https://docs.oracle.com/en/database/oracle/oracle-database/12.2/tgdba/database-memory-allocation.html ... more

DBA SGA+PGA Memory Configuration and other Oracle EBS reports with Blitz Report™ on our demo environment

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select
*
from
(
select
x.inst_id,
x.name,
case when x.name not like '%cpu%' then x.value/1024/1024/1024 else x.value end value
from
(
select go.inst_id, 'cpu physical' name, go.value, 11 order_by from gv$osstat go where go.stat_name='NUM_CPUS' union all
select go.inst_id, 'memory physical' name, go.value, 1 order_by from gv$osstat go where go.stat_name='PHYSICAL_MEMORY_BYTES' union all
select go.inst_id, 'memory unused' name, go.value-(select sum(gp.value) from gv$parameter gp where go.inst_id=gp.inst_id and gp.name in ('sga_target','memory_target','pga_aggregate_target')) value, 2 order_by from gv$osstat go where go.stat_name='PHYSICAL_MEMORY_BYTES' union all
select gp.inst_id, gp.name, to_number(gp.value) value,
decode(gp.name,
'cpu_count',12,
'sga_max_size',3,
'sga_target',4,
'pga_aggregate_target',5,
'pga_aggregate_limit',6,
'memory_max_target',7,
'memory_target',8,
'result_cache_max_size',9
) order_by
from gv$parameter gp where gp.name in ('cpu_count','pga_aggregate_limit','pga_aggregate_target','sga_max_size','sga_target','memory_max_target','memory_target','result_cache_max_size')
) x
order by
x.inst_id,
x.order_by
)
union all
select
gi.inst_id,
'PGA record date: '||least(gi.startup_time,(select min(dhs.begin_interval_time) from dba_hist_snapshot dhs where vd.dbid=dhs.dbid and gi.instance_number=dhs.instance_number)) name,
null value
from
gv$instance gi,
v$database vd
union all
select
gi.inst_id,
'average PGA' name,
(select avg(dhp.value)/1024/1024/1024 from dba_hist_pgastat dhp where vd.dbid=dhp.dbid and gi.instance_number=dhp.instance_number and dhp.name='total PGA allocated') value
from
gv$instance gi,
v$database vd
union all
select
gi.inst_id,
'maximum PGA' name,
(select max(dhp.value)/1024/1024/1024 from dba_hist_pgastat dhp where vd.dbid=dhp.dbid and gi.instance_number=dhp.instance_number and dhp.name='maximum PGA allocated') value
from
gv$instance gi,
v$database vd
union all
select
to_number(null) inst_id,
case when ass.pname='DSTART' then 'System Stats record date: '||ass.pval2 else ass.pname end name,
to_number(decode(ass.pname,'DSTART',null,ass.pval1)) value
from sys.aux_stats$ ass
where
ass.pname in ('DSTART','CPUSPEEDNW','IOSEEKTIM','IOTFRSPEED','MBRC')
union all
select
to_number(null) inst_id,
'Pack License: '||vp.value name,
null value
from
v$parameter vp
where
vp.name='control_management_pack_access'
union all
select distinct to_number(null) inst_id, 'AWR Report last usage date: '||max(dfus.last_usage_date) over () name, null value from dba_feature_usage_statistics dfus where dfus.name='AWR Report' and dfus.dbid in (select vd.dbid from v$database vd) union all
select distinct to_number(null) inst_id, 'AWR Report usages: '||sum(dfus.detected_usages) over () name, null value from dba_feature_usage_statistics dfus where dfus.name='AWR Report' and dfus.dbid in (select vd.dbid from v$database vd)

select * from ( select x.inst_id, x.name, case when x.name not like '%cpu%' then x.value/1024/1024/1024 else x.value end value from ( select go.inst_id, 'cpu physical' name, go.value, 11 order_by from gv$osstat go where go.stat_name='NUM_CPUS' union all select go.inst_id, 'memory physical' name, go.value, 1 order_by from gv$osstat go where go.stat_name='PHYSICAL_MEMORY_BYTES' union all select go.inst_id, 'memory unused' name, go.value-(select sum(gp.value) from gv$parameter gp where go.inst_id=gp.inst_id and gp.name in ('sga_target','memory_target','pga_aggregate_target')) value, 2 order_by from gv$osstat go where go.stat_name='PHYSICAL_MEMORY_BYTES' union all select gp.inst_id, gp.name, to_number(gp.value) value, decode(gp.name, 'cpu_count',12, 'sga_max_size',3, 'sga_target',4, 'pga_aggregate_target',5, 'pga_aggregate_limit',6, 'memory_max_target',7, 'memory_target',8, 'result_cache_max_size',9 ) order_by from gv$parameter gp where gp.name in ('cpu_count','pga_aggregate_limit','pga_aggregate_target','sga_max_size','sga_target','memory_max_target','memory_target','result_cache_max_size') ) x order by x.inst_id, x.order_by ) union all select gi.inst_id, 'PGA record date: '||least(gi.startup_time,(select min(dhs.begin_interval_time) from dba_hist_snapshot dhs where vd.dbid=dhs.dbid and gi.instance_number=dhs.instance_number)) name, null value from gv$instance gi, v$database vd union all select gi.inst_id, 'average PGA' name, (select avg(dhp.value)/1024/1024/1024 from dba_hist_pgastat dhp where vd.dbid=dhp.dbid and gi.instance_number=dhp.instance_number and dhp.name='total PGA allocated') value from gv$instance gi, v$database vd union all select gi.inst_id, 'maximum PGA' name, (select max(dhp.value)/1024/1024/1024 from dba_hist_pgastat dhp where vd.dbid=dhp.dbid and gi.instance_number=dhp.instance_number and dhp.name='maximum PGA allocated') value from gv$instance gi, v$database vd union all select to_number(null) inst_id, case when ass.pname='DSTART' then 'System Stats record date: '||ass.pval2 else ass.pname end name, to_number(decode(ass.pname,'DSTART',null,ass.pval1)) value from sys.aux_stats$ ass where ass.pname in ('DSTART','CPUSPEEDNW','IOSEEKTIM','IOTFRSPEED','MBRC') union all select to_number(null) inst_id, 'Pack License: '||vp.value name, null value from v$parameter vp where vp.name='control_management_pack_access' union all select distinct to_number(null) inst_id, 'AWR Report last usage date: '||max(dfus.last_usage_date) over () name, null value from dba_feature_usage_statistics dfus where dfus.name='AWR Report' and dfus.dbid in (select vd.dbid from v$database vd) union all select distinct to_number(null) inst_id, 'AWR Report usages: '||sum(dfus.detected_usages) over () name, null value from dba_feature_usage_statistics dfus where dfus.name='AWR Report' and dfus.dbid in (select vd.dbid from v$database vd)

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