'overall target of auto PGA' is too small compared to the overall target of the PGA

Hi all.

The database is 11gR 2 (11.2.0.3) on a linux machine.

'global setting of target PGA' is about 25 giga size.
'overall target of auto PGA' is about 5.5 gigabytes size
'Allocated total PGA' is about 25 giga size.
"total PGA inuse" is about 19.5 giga size.

According to the manual of the oracle, "total target auto PGA" means:

Amount of memory PGA the Oracle database can use workspaces running in automatic mode. This amount comes dynamically PGA_AGGREGATE_TARGET initialization parameter value and work load current workspace and set continuously from the Oracle database.

If this value is small compared to the value of PGA_AGGREGATE_TARGET, then a large amount of memory on the PGA TOUR is used by other components of the system (for example, PL/SQL or Java memory) and little is left for work areas. The DBA should ensure that enough memory PGA is left of workspaces running in automatic mode

-----------------------------------------

My question is following:

1. what component consumes about 20 gigabytes size of the pga (total 25 giga).
If the PL/SQL or Java memory consumes 20 giga size, isn't too compard to a total of size pga (25giga)?
Does rely on applications? (we have procedures/packages in the database server-side)

2. the total amount allocated (25 giga) PGA is close to "Global PGA target parameter (25giga).
"total PGA inuse" is about 19.5 giga.

Is that mean that data from free space of 5.5 giga size PGA?
I'm a bit confused between 'PGA Total allocated' and 'total PGA inuse.

------------------------------------

{code}

Select name, decode (unit, 'bytes', round(value/1024/1024), value) mega_value, unit
v $ pgastat



aggregate the target PGA 25 600 bytes parameter
overall target of auto PGA 5 505 bytes
global memory related to 1024 bytes
Total PGA inuse 19 483 bytes
PGA total allocated 25 503 bytes
PGA maximum allocated 53 426 bytes
total number of freeable memory PGA 2 486 bytes
number of processes 5 946
Max process count 6 039
PGA memory freed to OS 39,677,868 bytes
Total PGA used to auto workareas - bytes
Maximum PGA used to auto workareas 15 543 bytes
Total PGA used for manual workareas - bytes
Maximum PGA used for manual workareas 38 293 bytes
during the allocation, count 3 733
the treated bytes 17,288,505 bytes
3 144 169 bytes read or written additional bytes
cache hit percentage 85%
has count 13,254,278 (total)


{/ code}

Thanks in advance.

Best regards.

Published by: 869578 on October 7, 2012 20:39

869578 wrote:
-----------------------------------------

My question is following:

1. what component consumes about 20 gigabytes size of the pga (total 25 giga).
If the PL/SQL or Java memory consumes 20 giga size, isn't too compard to a total of size pga (25giga)?
Does rely on applications? (we have procedures/packages in the database server-side)

The place to look is v$ process_memory (see, for example this blog post - ignore the fact that he speaks a bug 3 years ago, the SQL to query the memory usage is the bit important to you).

2. the total amount allocated (25 giga) PGA is close to "Global PGA target parameter (25giga).
"total PGA inuse" is about 19.5 giga.

Is that mean that data from free space of 5.5 giga size PGA?
I'm a bit confused between 'PGA Total allocated' and 'total PGA inuse.

Basically Yes, your system currently thinks only about 5.5 GB of memory that can be called on any process requiring more memory to work. When a process requests from memory (for example, sorting) it will not necessarily return at the time wherever he has done with her, because she plans to use it again in the near future. This is why the amount awarded may be higher than currently in use. If another process.

------------------------------------

{code}

Select name, decode (unit, 'bytes', round(value/1024/1024), value) mega_value, unit
v $ pgastat

aggregate the target PGA 25 600 bytes parameter
overall target of auto PGA 5 505 bytes
global memory related to 1024 bytes
Total PGA inuse 19 483 bytes
PGA total allocated 25 503 bytes
PGA maximum allocated 53 426 bytes
total number of freeable memory PGA 2 486 bytes
number of processes 5 946

{code}

You have almost 6 000 live processes - and it takes a couple of MB per process just to get a few bits of SQL, is not really surprising that you have already allocated about 19 GB of memory - what is an average of 3 MB per process. You CAN see, however, that a few processes have to run away with a big piece, which is why you can watch process $ v and v$ process_memory in detail.

Concerning
Jonathan Lewis

Tags: Database

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