Is result cache, part of PGA or SGA(Shared Pool)

Is result cache, part of PGA or SGA(Shared Pool). whats is its stand when is is in a dedicated server or a RAC environment

Server query result cache can only be in SGA otherwise it could not be shared: http://download.oracle.com/docs/cd/E11882_01/server.112/e16638/memory.htm#BGBGEACF
Edited by: P. Forstmann on 28 sept. 2010 09:30

Similar Messages

Oracle 11g result cache and TimesTen

Oracle 11g has introduced the concept of result cache whereby the result set of frequently executed queries are stored in cache and used later when other users request the same query. This is different from caching the data blocks and exceuting the query over and over again.
Tom Kyte calls this just-in-time materialized view whereby the results are dynamically evaluated without DBA intervention
http://www.oracle.com/technology/oramag/oracle/07-sep/o57asktom.html
My point is that in view of utilities like result_cache and possible use of Solid State Disks in Oracle to speed up physical I/O etc is there any need for a product like TimesTen? It sounds to me that it may just asdd another layer of complexity?

Oracle result cache ia a useful tool but it is distinctly different from TimesTen. My understanding of Oracle's result cache is caching results set for seldom changing data like look up tables (currencies ID/code), reference data that does not change often (list of counter parties) etc. It would be pointless for caching result set where the underlying data changes frequently.
There is also another argument for SQL result cache in that if you are hitting high on your use of CPUs and you have enough of memory then you can cache some of the results set thus saving on your CPU cycles.
Considering the arguments about hard wired RDBMS and Solid State Disks (SSD), we can talk about it all day but having SSD does not eliminate the optimiser consideration for physical I/O. A table scan is a table scan whether data resides on SCSI or SSD disk. SSD will be faster but we are still performing physical IOs.
With regard to TimesTen, the product positioning is different. TimesTen is closer to middletier than Oracle. It is designed to work closely to application layer whereas Oracle has much wider purpose. For real time response and moderate volumes there is no way one can substitue TimesTen with any hard wired RDBMS. The request for result cache has been around for sometime. In areas like program trading and market data where the underlying data changes rapidly, TimesTen will come very handy as the data is real time/transient and the calculations have to be done almost realtime, with least complications from the execution engine. I fail to see how one can deploy result cache in this scenario. Because of the underlying change of data, Oracle will be forced to calculate the queries almost everytime and the result cache will be just wasted.
Hope this helps,
Mich

If sga_target set explicitly, result cache become disabled

hi all,
I am using 11g R2 and automatic memory management. I realized something. if I explicitly declare sga_target parameter in parameter file, result cache become disabled.
as you know if you use automatic memory management, sga_target is set to 0 automatically already but if I write that to the parameter file than whatever I set for result_cache_max_size parameter, instance always opens with result_cache_max_size=0 (I saw that in alert log).
is there any reason for that ?
here is my pfile contents.
orcl.__db_cache_size=922746880
orcl.__java_pool_size=33554432
orcl.__large_pool_size=16777216
orcl.__oracle_base='C:\app\paranoyakX'#ORACLE_BASE set from environment
orcl.__pga_aggregate_target=838860800
orcl.__sga_target=1258291200
orcl.__shared_io_pool_size=0
orcl.__shared_pool_size=251658240
orcl.__streams_pool_size=16777216
*.audit_file_dest='C:\app\paranoyakX\admin\orcl\adump'
*.audit_trail='DB_EXTENDED'
*.compatible='11.2.0.0.0'
*.control_files='C:\app\paranoyakX\oradata\orcl\control01.ctl','C:\app\paranoyakX\flash_recovery_area\orcl\control02.ctl'
*.db_16k_cache_size=0
*.db_4k_cache_size=0
*.db_block_size=8192
*.db_domain='oracle.com'
*.db_flashback_retention_target=1000
*.db_keep_cache_size=0
*.db_name='orcl'
*.db_recovery_file_dest='C:\app\paranoyakX\flash_recovery_area'
*.db_recovery_file_dest_size=10737418240
*.diagnostic_dest='C:\app\paranoyakX'
*.dispatchers='(PROTOCOL=TCP) (SERVICE=orclXDB)'
*.memory_max_target=34359738368
*.memory_target=2097152000
*.nls_language='TURKISH'
*.nls_territory='TURKEY'
*.open_cursors=300
*.pga_aggregate_target=528482304
*.processes=150
*.remote_login_passwordfile='EXCLUSIVE'
*.resource_limit=TRUE
*.undo_tablespace='UNDOTBS1'
*.result_cache_max_size=5000000
*.sga_target=0

I would suggest that you pay more attention to documentation and don't jump to conclusion in a haste. Just because the parameter result_cache_max_size is set to 0, it does not mean that the result cache in itself is disabled. This is the maximum size of the result cache. See below,
[oracle@edbar2p0-orcl ~]$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.1.0 Production on Thu Jul 14 08:35:00 2011
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
With the Partitioning, Automatic Storage Management, OLAP, Data Mining
and Real Application Testing options
SQL> sho parameter result
NAME                                 TYPE        VALUE
client_result_cache_lag              big integer 3000
client_result_cache_size             big integer 0
result_cache_max_result              integer     5
result_cache_max_size                big integer 1184K
result_cache_mode                    string      MANUAL
result_cache_remote_expiration       integer     0
SQL> show parameter sga
NAME                                 TYPE        VALUE
lock_sga                             boolean     FALSE
pre_page_sga                         boolean     FALSE
sga_max_size                         big integer 460M
sga_target                           big integer 0
SQL> set autot trace exp
selSQL> ect /*+ result_cache */ * from scott.dept;
Execution Plan
Plan hash value: 3383998547
| Id | Operation          | Name                       | Rows | Bytes | Cost (
%CPU)| Time     |
|   0 | SELECT STATEMENT   |                            |     4 |    80 |     3
(0)| 00:00:01 |
|   1 | RESULT CACHE      | 1c13q1afp56bq0jpnmysvywx7g |       |       |
     |          |
|   2 |   TABLE ACCESS FULL| DEPT                       |     4 |    80 |     3
(0)| 00:00:01 |
Result Cache Information (identified by operation id):
   1 - column-count=3; dependencies=(SCOTT.DEPT); name="select /*+ result_cache
*/ * from scott.dept"
SQL> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
With the Partitioning, Automatic Storage Management, OLAP, Data Mining
and Real Application Testing optionsThe value for the result_cache parameter is automatically set by oracle depending on either you have Memory_target/SGA_TARGET or Shared_Pool parameter set. Please see oracle documentation for more information.
HTH
Aman....

Oracle 11g Result Cache

Hi,
I have read that there is SGA component called Result Cache. According to documentation:
The result cache buffers query results. If a query is run that
already has results in the result cache, the database returns
results from the result cache instead of rerunning the query. This
speeds up the execution of frequently run queries.
What happens when data in tables which are called by the query change. I think the old data still will be in cache and I always get the old data.
Peter D.

Hi Peter
What happens when data in tables which are called by
the query change. I think the old data still will be in
cache and I always get the old data.The server result cache can return old data only for distributed queries (i.e. queries also retrieving data from other databases).
All local queries return the correct data. To do so, the cache entries are invalidated as required.
HTH
Chris Antognini
Author of Troubleshooting Oracle Performance, Apress 2008 (http://top.antognini.ch)

Where does a PL/SQL block run? PGA or SGA?

Hi all,
11g
I'm not familiar with the oracle memory structure, if I have a simple pl/sql block as below
DECLARE
v1 number;
BEGIN
v1:=100;
DBMS_OUTPUT.PUT_LINE(v1);
END;in my mind, even though it's a small block, when i execute it, it would also consume some memory, where does this memory come from, pga or sga?
in other words, when 'pl/sql engine' needs some memory, for example, for the local variables, where does this memory come from?
many thanks.

in my mind, even though it's a small block, when i execute it, it would also consume some memory, where does this memory come from, pga or sga?
in other words, when 'pl/sql engine' needs some memory, for example, for the local variables, where does this memory come from?SGA
The SGA comprises a number of memory components, which are pools of memory used to satisfy a particular class of memory allocation requests. Examples of memory components include the shared pool (used to allocate memory for SQL and PL/SQL execution), the java pool (used for java objects and other java execution memory), and the buffer cache (used for caching disk blocks). All SGA components allocate and deallocate space in units of granules. Oracle Database tracks SGA memory use in internal numbers of granules for each SGA component.
for any sort operations, hash joings, it uses PGA.
Read http://download.oracle.com/docs/cd/B19306_01/server.102/b14220/memory.htm

PL/SQL Function Result Cache?

Hi all,
As we know, there's a new feature in 11g, called 'result cache', this 'result cache' can be shared throughout the whole instance, but if I got it right, only sql query result and function return value are cached, right? how about the store procedure, I mean, procedure also has its 'return value'--the output parameter, could it benefit from this new feature?
Another question is, if my PL/SQL Function just retrieves the table and returns the result without any complicated calculation, is it necessary to enable the 'result cache' mechanism on this Function? because we already have 'db buffer cache' if the only thing we do is to query tables.
Many thanks.

Hi Morven,
As of now, PL/SQL Result cache feature is only enabled for stored functions and not for procedures. This is due to the objectives they achieve. Functions are usually computative and procedures are for logic implementation.
And for enabling result caching feature for a function, you are the better judge as u can test the performance in both the case. But, i would support enabling the cache because oracle 11g provides Cache as a different SGA component. db_buffer_cache will also be used for buffering other data blocks and not the result sets.
Hope my explanation is fine.

PGA vs SGA

hi,
i read the documents which says that pga has individual user datas like bind variables.session info.
here oracle how the pga communicate with sga for execution.
what are the components for PGA
thanks
with regards

user3266490 wrote:
hi,
i totally confused about PGA and shared pool.is there any relation between librarcy cache and pga.
whether,when the user exeutes select,insert,update,delete these are in librarcy cache or PGA.
i read that parsing,optimzation,execution,fetching there are happening in Library cahe.
so why oracle created the runtime area in PGASo why there is a confusion? The parsing, execution, they are all happening in the SGA because what is needed is that if someone else also requires the same data, for example, the same execution plan, the same data buffers, it should all be accessible from the SGA which is going to be shared among the users. But the PGA contains the data structures which don't do this! Answer this, when you do an order by , does it mean that all the other users also start seeing teh data in the order by clause by default? The answer should be no. This sorted data is just kept in the pga of yours. Similarly, there is a bind variable which is shared among the users but two different users need to use two different values of it.Where it is best to keep those different values, in their own PGAs isn't it? Hence its the private memory of the sessions.
HTH
Aman....

Difference between UGA, PGA and SGA in oracle

please tell me what is the difference between UGA, PGA and SGA in oracle in the simple layman language
thanx in advance

UGA
The User Global Area (UGA) is a memory area (RAM) that holds session-based information.
Shared Server Area
When running in [[Shared Server]] mode (MTS with shared servers and dispatchers), sessions can be served by multiple server processes. As a result, the UGA cannot be stored in the [[PGA]], and is moved to the [[SGA]] (shared global area).
Dedicated Server
When running in [[Dedicated Server]] mode (one session = one dedicated process), the UGA is stored in the [[PGA]] (process global area).
i have question......
how to check and monitor the cpu usage ,temporary and memory usage in db?
ple could any body explain me.................
Edited by: 821205 on Dec 20, 2010 7:59 AM

How to configure search results web part to display results only after a query is generated from user?

Hi All,
I am crawling documents from a file server. I created a new content source and crawled the documents. All documents are crawled successfully.
Then I went to my enterprise search center site collection and created a new result source. I have added the query to use above content source.
After that, on a page I am trying to configure the search results web part to display documents using this result source. Now the problem is:
It displays all the documents that are crawled without searching for anything. I mean first it should not display any results. If a user searches for something , then according to that search it should display results.
Any idea how to do this in the web part? I am using SharePoint 2013 on premise enterprise edition. No code. Totally OOTB.

Hi Mohan,
What did you use for the Query text in the result source?
I could reproduce this issue when I used Query text like: {searchTerms} Path:”http://sps2k13sp/sites/First/Shared%20Documents”
Then I changed the Query to
{?{searchTerms}
Path:"http://sps2k13sp/sites/First/Shared%20Documents"}
, then Search result web part didn’t return results without searching.
So , check your result source, and use the Query like the above(adding "{?...}").
I hope this helps.
Thanks,
Wendy
Wendy Li
TechNet Community Support

Query result caching on oracle 9 and 10 vs indexing

I am trying to improve performance on oracle 9i and 10g.
We use some queries that take up to 30 minutes to execute.
I heard that there are some products to cache query results.
Would this have any advantage over using indexes or materialized views?
Does anyone know any products that I can use to cache the results of this queries on disk?
Personally I think that by using the query result caching I would reduce the cpu time needed to process the query.
Is this true?

Your message post pushes all the wrong buttons starting with the fact that 9i and 10g are marketing labels not version numbers.
You don't tune queries by spending money and throwing resources at them. You tune them by identifying the problem queries, running explain plans, visualizing their output using DBMS_XPLAN, and addressing the root cause.
If you want help post full version numbers, the SQL statements, and the DBMS_XPLAN outputs.

Oracle 11g/R2 Query Result Cache - Incremental Update

Hi,
In Oracle 11g/R2, I created replica of HR.Employees table & executed the following statement (+Although using SUM() function is non-logical in this case, but just testifying the result+)
STEP - 1
SELECT      /+ RESULT_CACHE */ employee_id, first_name, last_name, SUM(salary)*
FROM           HR.Employees_copy
WHERE      department_id = 20
GROUP BY      employee_id, first_name, last_name;
EMPLOYEE_ID      FIRST_NAME LAST_NAME     SUM(SALARY)
202           Pat           Fay          6000
201           Michael           Hartstein     13000
Elapsed: 00:00:00.01
Execution Plan
Plan hash value: 3837552314
| Id | Operation           | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT      | | 2 | 130 | 4 (25)| 00:00:01 |
| 1 | RESULT CACHE      | 3acbj133x8qkq8f8m7zm0br3mu | | | | |
| 2 | HASH GROUP BY      | | 2 | 130 | 4 (25)| 00:00:01 |
|* 3 | TABLE ACCESS FULL     | EMPLOYEES_COPY | 2 | 130 | 3 (0)| 00:00:01 |
--------------------------------------------------------------------------------------------------     Statistics
0 recursive calls
0 db block gets
0 consistent gets
0 physical reads
0 redo size
*690* bytes sent via SQL*Net to client
416 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
2 rows processed
STEP - 2
INSERT INTO HR.employees_copy
VALUES(200, 'Dummy', 'User','[email protected]',NULL, sysdate, 'MANAGER',5000, NULL,NULL,20);
STEP - 3
SELECT      /*+ RESULT_CACHE */ employee_id, first_name, last_name, SUM(salary)
FROM           HR.Employees_copy
WHERE      department_id = 20
GROUP BY      employee_id, first_name, last_name;
EMPLOYEE_ID      FIRST_NAME LAST_NAME SUM(SALARY)
202      Pat      Fay      6000
201      Michael      Hartstein      13000
200      Dummy User      5000
Elapsed: 00:00:00.03
Execution Plan
Plan hash value: 3837552314
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT |          | 3 | 195 | 4 (25)| 00:00:01 |
| 1 | RESULT CACHE | 3acbj133x8qkq8f8m7zm0br3mu | | | | |
| 2 | HASH GROUP BY | | 3 | 195 | 4 (25)| 00:00:01 |
|* 3 | TABLE ACCESS FULL| EMPLOYEES_COPY | 3 | 195 | 3 (0)| 00:00:01 |
     Statistics
0 recursive calls
0 db block gets
4 consistent gets
0 physical reads
0 redo size
*714* bytes sent via SQL*Net to client
416 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
3 rows processed
In the execution plan of STEP-3, against ID-1 the operation RESULT CACHE is shown which shows the result has been retrieved directly from Result cache. Does this mean that Oracle Server has Incrementally Retrieved the resultset?
Because, before the execution of STEP-2, the cache contained only 2 records. Then 1 record was inserted but after STEP-3, a total of 3 records was returned from cache. Does this mean that newly inserted row is retrieved from database and merged to the cached result of STEP-1?
If Oracle server has incrementally retrieved and merged newly inserted record, what mechanism is being used by the Oracle to do so?
Regards,
Wasif
Edited by: 965300 on Oct 15, 2012 12:25 AM

965300 wrote:
Hi,
In Oracle 11g/R2, I created replica of HR.Employees table & executed the following statement (+Although using SUM() function is non-logical in this case, but just testifying the result+)
STEP - 1
SELECT      /+ RESULT_CACHE */ employee_id, first_name, last_name, SUM(salary)*
FROM           HR.Employees_copy
WHERE      department_id = 20
GROUP BY      employee_id, first_name, last_name;
EMPLOYEE_ID      FIRST_NAME LAST_NAME     SUM(SALARY)
202           Pat           Fay          6000
201           Michael           Hartstein     13000
Elapsed: 00:00:00.01
Execution Plan
Plan hash value: 3837552314
| Id | Operation           | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT      | | 2 | 130 | 4 (25)| 00:00:01 |
| 1 | RESULT CACHE      | 3acbj133x8qkq8f8m7zm0br3mu | | | | |
| 2 | HASH GROUP BY      | | 2 | 130 | 4 (25)| 00:00:01 |
|* 3 | TABLE ACCESS FULL     | EMPLOYEES_COPY | 2 | 130 | 3 (0)| 00:00:01 |
--------------------------------------------------------------------------------------------------     Statistics
0 recursive calls
0 db block gets
0 consistent gets
0 physical reads
0 redo size
*690* bytes sent via SQL*Net to client
416 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
2 rows processed
STEP - 2
INSERT INTO HR.employees_copy
VALUES(200, 'Dummy', 'User','[email protected]',NULL, sysdate, 'MANAGER',5000, NULL,NULL,20);
STEP - 3
SELECT      /*+ RESULT_CACHE */ employee_id, first_name, last_name, SUM(salary)
FROM           HR.Employees_copy
WHERE      department_id = 20
GROUP BY      employee_id, first_name, last_name;
EMPLOYEE_ID      FIRST_NAME LAST_NAME SUM(SALARY)
202      Pat      Fay      6000
201      Michael      Hartstein      13000
200      Dummy User      5000
Elapsed: 00:00:00.03
Execution Plan
Plan hash value: 3837552314
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT |          | 3 | 195 | 4 (25)| 00:00:01 |
| 1 | RESULT CACHE | 3acbj133x8qkq8f8m7zm0br3mu | | | | |
| 2 | HASH GROUP BY | | 3 | 195 | 4 (25)| 00:00:01 |
|* 3 | TABLE ACCESS FULL| EMPLOYEES_COPY | 3 | 195 | 3 (0)| 00:00:01 |
     Statistics
0 recursive calls
0 db block gets
4 consistent gets
0 physical reads
0 redo size
*714* bytes sent via SQL*Net to client
416 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
3 rows processed
In the execution plan of STEP-3, against ID-1 the operation RESULT CACHE is shown which shows the result has been retrieved directly from Result cache. Does this mean that Oracle Server has Incrementally Retrieved the resultset?
Because, before the execution of STEP-2, the cache contained only 2 records. Then 1 record was inserted but after STEP-3, a total of 3 records was returned from cache. Does this mean that newly inserted row is retrieved from database and merged to the cached result of STEP-1?
If Oracle server has incrementally retrieved and merged newly inserted record, what mechanism is being used by the Oracle to do so?
Regards,
Wasif
Edited by: 965300 on Oct 15, 2012 12:25 AMNo, the RESULT CACHE operation doesn't necessarily mean that the results are retrieved from there. It could be being
written to there.
Look at the number of consistent gets: it's zero in the first step (I assume you had already run this query before) and I would
conclude that the data is being read from the result cache.
In the third step there are 4 consistent gets. I would conclude that the data is being written to the result cache, a fourth step repeating
the SQL should show zero consistent gets and that would be the results being read.

Search Result Web Part - "Sorry, something went wrong " Unless users have edit rights.

I have a SharePoint 2013 farm. On content pages, we are using search result web parts. If the user has edit rights, they work but if the user has only read rights there is a "Sorry, something went wrong." Error.
Thanks for your help in advance.

This is a pretty generic error in SharePoint that can be caused by any number of things. You can take a look a the Web Parts Maintenance Page by adding "?content=1" to the URL of your page. If you recently added a web part to the page or some other customization,
this will allow you to turn it off.
More than likely though, you will have to do some digging. Whenever you are in that page and get an error, you get a correlation id like in your example above. You can dig deep into the logs by finding them (typically in C:\program files\common files\microsoft
shared\15\logs). Look for the most recent file and do a search it in and see if you can find that correlation id. If you can't find it you might try the previous log. When you find matching entries for the correlation id, you should get some idea to the component
that is failing and causing your issues.

'People Search Core Result' web part with 'office' filter in Keyword Query is not returning results

I have created a page with "People search core result" web part on SharePoint 2010.
When I try to use the setting (A) or (C) as shown below, there is no results been returned but when set to setting (B), there are results been returned.
In the returned results I can see the OfficeNumber field is been populated with values and some of them is "UK Finance".
Setting (A)
Result Query Options
-- Fixed Keyword Query = contentclass:spspeople -- Append Text To Query = Department:"Finance" AND OfficeNumber:"UK Finance"
Setting (B)
Result Query Options
--- Fixed Keyword Query = contentclass:spspeople --- Append Text To Query = Department:"Finance"
Setting (C)
Result Query Options
--- Fixed Keyword Query = contentclass:spspeople --- Append Text To Query = OfficeNumber:"UK Finance"
What am I doing wrong here? Am I missing something? Do I need any additional configuration in order to get this to work?
I hope someone could help me or point me to the right direction.
Thank you
muges

You might want to check the Manage User Properties area of the User Profile Service in Central Admin.
Any properties you query on should be marked "Indexed" or "Use in Scopes". You can also check that you are using the correct internal name for these properties.

How to display document last modfied date time in core result web part?

Hi,
We have a requirment in the sharepoint application where we need to display last modified date&time of document in core result web part.
To support this we have specify the property <Column Name="Write"/> in custom XSL.
But it displays only the modified date.Is there is way to display modified date and time as well?
D.Ganesh

If you want to modify the
XML can do i tin the
template "DisplayTemplate":
An example:
Replace
<xsl:value-of select="write" />
by
<xsl:value-of select="ddwrt:FormatDate($write, 1033, 2)"/>
But I think the managed property"Write"
is returned only as
Date without
Time. By
this time will
always 00:00.
To see the resulting XML
can replace
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:template match="/">
<xmp><xsl:copy-of select="*"/></xmp>
</xsl:template>
</xsl:stylesheet>
Where you see the format
of "write"
http://msdn.microsoft.com/en-us/library/ms546985(v=office.14).aspx
Miguel de Hortaleza

More than 5 query IDs in the search core results web part?

I need to have six search results web parts on the same page, all using the FASTSearch location, but each with a separate Search Action Links web part to sort it. But there are only 5 cross-web part query IDs available. Is it possible to
extend the Search Core Results web part to have more than 5 queryIDs?
David Tappan C/D/H Grand Rapids, MI

Did you figure this out?

Is result cache, part of PGA or SGA(Shared Pool)

Similar Messages

Maybe you are looking for