Query in parallel several caches

Hi experts,

I have several caches defined in the configuration of the cache of the client. And I wanted to interrogate the different caches at the same time. If I use the thread to do the work, it will be for each cache network call (I use TCP extend). Instead, I want it to be managed within the grid. Any suggestions on this?

I appreciate your valuable contributions.

Kind regards
knockaert

Hi Karthik,

Yes, you need to configure a system call on the server and the remote-invocation-pattern on the client, there is no way around that, but it is not really difficult. The client will always connect to the server through the same proxy system.

EntryProcessors are not really good for what you need as they normally run against a cache or entered into a cache. While allows you to encode an input processor to query multiple caches and return a result, you would be in danger of blocking of service, unless you are careful in the way you did.

If you want to pass parameters to the calling function, then they are in fact the parameters to your invoked class.

For example:
If I wanted some parameters in the example above, I could change the remained like that. In this case, I added two string parameters, but you can add whatever it is the same way. In the run() method, you can now use the settings. You must ensure that you add parameters to methods POF writeExternal and readExternal methods.

public class CacheQuery extends AbstractInvocable implements PortableObject {

    private String parameter1;
    private String parameter2;

    // Need and no-arg constructor for POF
    public CacheQuery()
    {
    }

    public CacheQuery(String parameter1, String parameter2)
    {
        this.parameter1 = parameter1;
        this.parameter2 = parameter2;
    }

    public void run()
    {
        Object result = ... // Perform your cache queries 

        // set the results to pass back to the client
        setResult(result);
    }

    public void readExternal(PofReader pofReader) throws IOException {
        parameter1 = pofReader.readString(100);
        parameter2 = pofReader.readString(101);
    }

    public void writeExternal(PofWriter pofWriter) throws IOException {
        pofWriter.writeString(100, parameter1);
        pofWriter.writeString(101, parameter2);
    }
}

Now you can set the parameters in the client code using the justiciable constructor. For example the following code defines two parameters 'value 1' and ' value-2 ".

InvocationService service = (InvocationService) CacheFactory.getService("EXAMPLE-INVOCATION-SERVICE");
CacheQuery invocable = new CacheQuery("value-1", "value-2");
Object result = service.query(invocable, null);

Published by: Jonathan.Knight on April 25, 2010 16:48

Tags: Fusion Middleware

Similar Questions

Why can't I run this query in parallel?

DB version: 11.2.0.4
Platform: Oracle Linux 6.5
In my DB, a job with parallelism 5 as stats collection below works well. OEM, I confirm that the bottom congregate, stats job runs with 5 slave process.
exec dbms_stats.gather_table_stats (-)
ownname = > 'MEA ', -.
tabname = > "ORDER_DETAIL", -.
estimate_percent = > DBMS_STATS. AUTO_SAMPLE_SIZE, -.
Cascade = > TRUE;
method_opt = > 'for all THE COLUMNS of SIZE AUTO ', -.
degree = > 5);
Order_Detail is a table with 400 million records. I wanted to get a number of rows in this table. So, I tried to use parallelism as shown below.
But the process of slaves were not created. The SELECT query worked only with parallelism 1. I have this cofirmed of data in real-time to OEM and gv$ view px_session.
SQL > show parameter parallel_max_servers
VALUE OF TYPE NAME
------------------------------------ ----------- ------------------------------
PARALLEL_MAX_SERVERS around 3200
SQL > ALTER SESSION FORCE PARALLEL QUERY 5 PARALLELS;
Modified session.
SQL > ALTER SESSION enable parallel query.
Modified session.
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-Also tried
Select / * + PARALLEL(ptms.order_detail,5) * / count (*) from ptms.order_detail;
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DEGREE OF TABLE_NAME
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Have you tried the trick

SELECT / * + PARALLEL * / COUNT (*)...

Need for the sql query to have several columns in a single coulumn
Hi all

I need create the query to have several columns in a single column with several lines.

Select a.customer_trx_id, a.previous_customer_trx_id
of ra_customer_trx_all one
where a.customer_trx_id =: customer_trx_id

Here, a.customer_trx_id and a.previous_customer_trx_id are in two columns. I need to put them in a single column.

Say: the foregoing is output
--------------------------------------------------------------------------------
a.customer_trx_id a.previous_customer_trx_id

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

Need for a single column

As

--------------------------------------------------------------------------------
123456
87654

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

Please do the needful. Please note that it is not the UNION.

Thank you
Abdul
Hello

You want a way to confirm that what looks like two rows is really a line?

Here are three ways:

(1) count the lines:
```
WITH  my_original_querry     AS
(
     select  a.customer_trx_id || CHR(13)
                      || a.previous_customer_trx_id     as id
     from      ra_customer_trx_all     a
     where      a.customer_trx_id      = 274881
)
SELECT     COUNT (*)
FROM     my_original_query;
```
(2) in SQL * Plus, have SQL * more count them for you:
```
SET     FEEDBACK     1

select  a.customer_trx_id || CHR(13)
                 || a.previous_customer_trx_id     as id
from      ra_customer_trx_all     a
where      a.customer_trx_id      = 274881;
```
(3) implicitly count them with the ROWNUM Pseudo-column
```
select  a.customer_trx_id || CHR(13)
                 || a.previous_customer_trx_id     as id
,     ROWNUM
from      ra_customer_trx_all     a
where      a.customer_trx_id      = 274881;
```

Why doesn't a parallel query in parallel?

Hello

I hope someone can help me.

I tested (several times and different ways) to see if the parallel server will work and help on my queries.

My version is 11.2 on Solaris 10.

I have a table with more 100,000 records and set autotrace and calendar on for testing purposes.

I confirmed PARALLEL_MIN_SERVERS = 30 and PARALLEL_MAX_SERVERS = 160 and PARRALLEL_SERVERS_PER_CPU = 2.
(my server has 4 CPU)

I tested the full table running scan (select * from table) and time taken about 13:30 minutes.

Then, I changed the table and set 4 Parallels.
Run the test again and he ran more slowly (about 16 minutes).

Then I ran select / * + parallel (manual) * / and it was always about 14 minutes.

Then I ran select / * + parallel 4 * / and it took about 14:30 minutes.

Then I reset the degree of parallel to the table to 1.
Then, ran select / * + parallel 4 * / and it took a little less than 13:30 minutes.

So, it seems that it does not use any parallel query. Why not?

SQL> sho parameter cpu

NAME                                 TYPE                             VALUE
------------------------------------ -------------------------------- ---------
cpu_count                            integer                          4
parallel_threads_per_cpu             integer                          2
resource_manager_cpu_allocation      integer                          4

SQL> sho parameter parallel

NAME                                 TYPE                             VALUE
------------------------------------ -------------------------------- ---------
fast_start_parallel_rollback         string                           LOW
parallel_adaptive_multi_user         boolean                          TRUE
parallel_automatic_tuning            boolean                          FALSE
parallel_degree_limit                string                           CPU
parallel_degree_policy               string                           MANUAL
parallel_execution_message_size      integer                          16384
parallel_force_local                 boolean                          FALSE
parallel_instance_group              string
parallel_io_cap_enabled              boolean                          FALSE
parallel_max_servers                 integer                          160
parallel_min_percent                 integer                          0
parallel_min_servers                 integer                          30
parallel_min_time_threshold          string                           AUTO
parallel_server                      boolean                          FALSE
parallel_server_instances            integer                          1
parallel_servers_target              integer                          64
parallel_threads_per_cpu             integer                          2
recovery_parallelism                 integer                          0

SQL> sho parameter servers

NAME                                 TYPE                             VALUE
------------------------------------ -------------------------------- ---------
max_shared_servers                   integer
parallel_max_servers                 integer                          160
parallel_min_servers                 integer                          30
parallel_servers_target              integer                          64
shared_servers                       integer                          1

PX COORDINATOR stage is something that you will see that when the plan uses parallel queries that are steps PX SEND QC (RANDOM) and PX BLOCK ITERATOR. You will also see that data in the column of PQ Distrib if parallel query is used. And the reference to the column of the IN-OUT backwards-> operations S indicates a transition between the parallel operations to the series (i.e. several parallel slaves, aggregated by one master series).

Justin

"Query in parallel" supported with EnterpriseOne

How parallel queries can be supported / not supported by the application? This is just a feature of database, moot?
If we allow the parallelism at the level of the table... queries will go through the parallel execution... what limitation will face the app?
DOC - ID 1527286.1

At the present time, we do not support the parallel query options or features

It just means that you should not try to change the behavior of the application through parallel processing - otherwise, you're on your own.

Clearly the app has been designed and tested with the treatment of the series, and therefore treatment series is the supported configuration. That is to say the OPLT configuration.

If you want to experiment with parallel processing, the seller won't stop you, but they want to support a configuration that is compatible OLTP.

Best way to query - filters vs. get() cache?
Hello

I'm in a dillemma. Whether to use the methods NamedCache.get () or entrySet (filter) to query the cache. Please guide me...

My understanding is that when using

1. get() or getAll(), consistency checks if the entry is in the cache, if it does not exist in the cache, coherence get his from the data store
2. simply entrySet (Filters), consistency checks the cache, and returns the results based on what is available in the cache.

In this case, is it not better to use get instead entrySet in a case where we do not know if up-to-date data are available in the Cache?

1. What is the difference between using a get and entrySet ?
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I'm newbie... Gurus, please guide me...
sjohn wrote:
Thank you, Robert.

So the air if I the search parameter is identical to the key, then its better to use get or count with all

Currently, I have a set of expiry-delay of 1 min on the Cache. So, this extract the expired data from the data store. Are there any trigger to get out of the box of coherence mechanisms?

I'm not sure that what you call the extraction of trigger mechanism.

Consistency can make periodic updates cached entries that have recently been consulted within a configurable time thanks to its cooling function in advance. You can read about it at http://wiki.tangosol.com/display/COH35UG/Read-Through%2C+Write-Through%2C+Write-Behind+and+Refresh-Ahead+Caching#Read-Through%2CWrite-Through%2CWrite-BehindandRefresh-AheadCaching-RefreshAheadCache

If this is not what you're after, would you care to elaborate a little bit on what you need?

Best regards

Robert

information processing in several caches in the same node
We use a partitioned cache to load the data (several types of data) into multiple named caches. In a single partition, we plan to have all the related data, and we have obtained using this key binding.

Now, I want to do the treatment with this node and a reconciliation of data from various sources. We tried the entry processor, but we want to consolidate all the data of multiple caches named in the node. Form a very naïve, I think to each cache named tabular and I'm looking for ways to have a processor that will do some processing on the associated data.

I see that we can use a combination of remained object, processors of service and entry Invocation, but I am unable to implement successfully.

Can you please point me to any implementation of reference where I can perform some processing on the data node without data transfer to the customer.

Also to reduce any reference implementation of the card (on the server side) in coherence would be useful.

Concerning
Gaudin
Gaudin

The same concept applies to batch processing. You can run an entry processor who starts a background thread for batch processing. The only drawback is that you must manage failover explicitly to restart the thread on a new Member if Member fails. This can be done by using a lease in the package of common incubator common.lease.

Paul

VPN access query remote ASA - several group policies for the unique connection profile

Hi all

Two quick questions here that I need to help.

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2. in an ASA-5525 for Clientless Remote access VPN, can pass us the page to connect to an external server? For example, if I have a connection with a URL profile setup: "'https://wyz.vpn.com/ ';" for the LDAP/Radius Authentication, but for https://wyz.vpn.com/data and https://wyz.vpn.com/test I want to HTTP based authentication form and this page needs to be sent to an external server that is to say ASA step will manage this page, but rather the first page for this is served by the external server.

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Thanks in advance to all!

Hello

You can have fallback to LOCAL only primary method.

http://www.Cisco.com/c/en/us/TD/docs/security/ASA/asa90/configuration/gu...

HTH

Averroès.

Query XML, obtaining several recordings

I have the bottom of the XML data in the xml_test table:

<?xml version="1.0"?>
<EntityLinkData xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <es>
    <e fid="TABLE" gid="akl239-239lks-23mlke">
      <flds>
        <fld>
          <k>FIELD1</k>
          <v xsi:type="DBNull" />
        </fld>
        <fld>
          <k>FIELD2</k>
          <v xsi:type="xsd:double">0.75</v>
        </fld>
        <fld>
          <k>FIELD3</k>
          <v xsi:type="xsd:double">1000</v>
        </fld>
        <fld>
          <k>FIELD4</k>
          <v xsi:type="DBNull" />
        </fld>        
      </flds>
    </e>
   </es>
  <rs />
</EntityLinkData>

Table: 
  CREATE TABLE XML_TEST 
   ( CONT_XML SYS.XMLTYPE 
   ) ;

This is the query that I'm working on. It is a lot to multiple records:

SELECT t.fmly_id,
  t.content_guid_char
  , s.dafd_id,
  dbms_xmlgen.CONVERT(x.v.getClobVal(), 1) val
FROM xml_test m,
  xmltable( xmlnamespaces( 'http://www.w3.org/2001/XMLSchema-instance' AS xsi, 'http://www.w3.org/2001/XMLSchema' AS "xsd"), 'EntityLinkData/es/e' passing m.cont_xml columns fmly_id path '/e/@fid', content_guid_char path '/e/@gid') t,
  xmltable( xmlnamespaces( 'http://www.w3.org/2001/XMLSchema-instance' AS xsi, 'http://www.w3.org/2001/XMLSchema' AS "xsd"), 'EntityLinkData/es/e/flds/fld' passing m.cont_xml columns dafd_id path '/fld/k') s, 
  XMLTable( 'EntityLinkData/es/e/flds/fld' passing m.cont_xml columns v XMLTYPE path 'v/text()' ) x;

o/p

TABLE	akl239-239lks-23mlke	FIELD1
TABLE	akl239-239lks-23mlke	FIELD1	0.75
TABLE	akl239-239lks-23mlke	FIELD1	1000
TABLE	akl239-239lks-23mlke	FIELD1
TABLE	akl239-239lks-23mlke	FIELD2
TABLE	akl239-239lks-23mlke	FIELD2	0.75
TABLE	akl239-239lks-23mlke	FIELD2	1000
TABLE	akl239-239lks-23mlke	FIELD2
TABLE	akl239-239lks-23mlke	FIELD3
TABLE	akl239-239lks-23mlke	FIELD3	0.75
TABLE	akl239-239lks-23mlke	FIELD3	1000
TABLE	akl239-239lks-23mlke	FIELD3
TABLE	akl239-239lks-23mlke	FIELD4
TABLE	akl239-239lks-23mlke	FIELD4	0.75
TABLE	akl239-239lks-23mlke	FIELD4	1000
TABLE	akl239-239lks-23mlke	FIELD4

Here is what I am trying to get:

TABLE	akl239-239lks-23mlke	FIELD1
TABLE	akl239-239lks-23mlke	FIELD2	0.75
TABLE	akl239-239lks-23mlke	FIELD3	1000
TABLE	akl239-239lks-23mlke	FIELD4

Can anyone help me please with the query?

Work on Oracle 11g, Win7

This is because you create a Cartesian product with each XMLTABLE rather that implicitly to join them using the clause of passage.

Something like that is what you want...

SQL > ed
A written file afiedt.buf

1 with t as (select xmltype ('http://www.w3.org/2001/XMLSchema-instance "container ="http://www.w3.org/2001/XMLSchema">"))
2
3
4
5
6 field1
7
8
9
10 Field2
11 0.75
12
13
14 field3
15 1000
16
17
18 FIELD4
19

20
21
22
23
24
25 ') in the XML of the double)
26-
27 end of test data
28-
29 select x.fmly_id
x.content_guid_char 30,
31, y.fld_k
32, y.fld_type
33, y.fld_val
34 FROM t
35, xmltable (xmlnamespaces ("http://www.w3.org/2001/XMLSchema-instance" AS "xsi"))
36, "http://www.w3.org/2001/XMLSchema" AS 'xsd')
37, ' EntityLinkData/are/e '.
38 passage t.xml
path of 39 columns fmly_id varchar2 (10) ' / e/@fid'
40, road of varchar2 (20) of content_guid_char ' / e/@gid'
41, flds xmltype path ' / e/flds. "
42 ) x
43, xmltable (xmlnamespaces ("http://www.w3.org/2001/XMLSchema-instance" AS "xsi"))
44, "http://www.w3.org/2001/XMLSchema" AS 'xsd')
45, "flds/fld.
from $ 46 x.flds
path of varchar2 (10) of fld_k 47 columns ' / fld/k '.
48, path of varchar2 (20) of fld_type ' / fld/v/@xsi:type'
49, path number fld_val "/ fld/v.
50* ) y
SQL > /.

FMLY_ID CONTENT_GUID_CHAR FLD_K FLD_TYPE FLD_VAL
---------- -------------------- ---------- -------------------- ----------
TABLE akl239-239lks-23mlke Field1 DBNull
TABLE akl239-239lks-23mlke FIELD2 xsd: double.75
TABLE akl239-239lks-23mlke FIELD3 xsd: double 1000
TABLE akl239-239lks-23mlke FIELD4 DBNull

SQL >

SQL query to assign several concurrent programs to the concurrent Manager.

Hello
You have any script to assign a list of program contributing to separate concurrent managers. Currently, there are more than 100 programs need to be assigned to the manager.ut
We do front end, but it will take quite a long time to complete this task.
Could you please help me on this.
Thank you and best regards,
Simone.

Hi Simone,.

First of all I need a sql query to find out what custom programs are assigned to which Manager.

Please see:

How can I tell which concurrent Manager handled a simultaneous [ID 344011.1] application/program

Find all programs assigned to the specialization Manager rules? [271283.1 ID]

Second, I have to give these programs customized to different custom managers.

See if this helps:

https://forums.Oracle.com/thread/2343489

Thank you &

Best regards

Need a sql query to get several dates in rows

Hi all
I need a query to get the dates of the last 7 days and each dates must be in a line...
but select sysdate double... gives a line...
Output of expexcted
Dates:
October 1, 2013
30 sep-2013
29 sep-2013
28 sep-2013
27 sep-2013
26 sep-2013

Try:

SQL > SELECT sysdate-7 + LEVEL FROM DUAL

2. CONNECT BY LEVEL<=>

3 * ORDER BY 1 DESC

SQL > /.

SYSDATE-LEVEL 7 +.

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

October 1, 2013 13:04:52

30 - Sep - 2013 13:04:52

29 - Sep - 2013 13:04:52

28 - Sep - 2013 13:04:52

27 - Sep - 2013 13:04:52

26 - Sep - 2013 13:04:52

25 - Sep - 2013 13:04:52

7 selected lines.

Query SQL involving several tables

I have a scenario in SQL where, for each position there are associated tags. A user is the one who makes the post and that he belongs to a given location. The location corresponds to a given country.

I create tables such as

CREATE TABLE post_table 
(
post_id VARCHAR(20), 
user_id VARCHAR(20),
PRIMARY KEY(post_id)
);

CREATE TABLE tags_table
(
   post_id VARCHAR(20),
   tags VARCHAR(20),
   PRIMARY KEY(tags, post_id),
   FOREIGN KEY(post_id) REFERENCES post_table(post_id) ON DELETE CASCADE
);


CREATE TABLE location
(
location_id VARCHAR(20), 
country VARCHAR(20),
PRIMARY KEY (location_id)
);

CREATE TABLE user_info
(
user_id VARCHAR(20), 
location_id VARCHAR(30), 
PRIMARY KEY (user_id),
FOREIGN KEY(location_id) REFERENCES location(location_id) ON DELETE CASCADE
);

Now, I insert values into these tables as

INSERT INTO post_table VALUES( 'p1', 'u1' );
INSERT INTO post_table VALUES( 'p2', 'u1' );
INSERT INTO post_table VALUES( 'p3', 'u2' );
INSERT INTO post_table VALUES( 'p4', 'u3' );
INSERT INTO post_table VALUES( 'p5', 'u2' );

INSERT INTO tags_table VALUES( 'p1', 'US Open' );
INSERT INTO tags_table VALUES( 'p1', 'Real good' );
INSERT INTO tags_table VALUES( 'p1', 'Madrid' );
INSERT INTO tags_table VALUES( 'p2', 'Madrid' );
INSERT INTO tags_table VALUES( 'p3', 'Rossoneri' );
INSERT INTO tags_table VALUES( 'p4', 'Milan' );
INSERT INTO tags_table VALUES( 'p4', 'Los Angeles' );
INSERT INTO tags_table VALUES( 'p5', 'Rossoneri' );

INSERT INTO location VALUES( 'loc1', 'Spain');
INSERT INTO location VALUES( 'loc2', 'England');

INSERT INTO user_info VALUES( 'u1', 'loc1' );
INSERT INTO user_info VALUES( 'u2', 'loc2' );
INSERT INTO user_info VALUES( 'u3', 'loc1' );

Now I have to query for each country, show them more SUV tag (s)

So, for these data, the result should be like

Country              MostTags
Spain                Madrid
England              Rossoneri

Please help me to write this query guys.

Hello

Something like that

select      country
     , tags from
           (
             select      l.country
               , t.tags
               , dense_rank() over (     partition by l.country
                              order by count(*) desc) drn
          from      location l
               , user_info u
               , post_table p
               , tags_table t
          where      l.location_id = u.location_id
               and p.user_id=u.user_id
               and p.post_id=t.post_id
          group by l.country
               , t.tags
     )
where drn <=1   -- rank depends on like 1,2 or 3 popular tags for each country

Concerning
Anurag

Query that returns several generic criteria using as and in
Hi there, try to do something like this:

Select * from tablename
Where columnname as 5% ' or as 8% ' or like 12% '

without the help OR... so in this big:

Select * from tablename
Where columnname like IN (5% ", 8%, 12%" ")

In MS Sql, I can do something like this:

SELECT * from tablename t
Where exists (select val FROM dbo.fn_String_To_Table (25, 05', '', 0))
ATA columname WHERE AS val + '%')

Where dbo.fn_String_To_Table converts the array of strings in a table.

Any suggestions?

Thank you very much.
Samir says:

where the comma-delimited string variable?

Use your imagination :):
```
select  *
  from  tablename t
  where regexp_like(t.column_name,'^(' || replace(starts_with_scv,',','|') || ')')
/ 
```
SY.

Feature of the parallel execution of SQL query

Hello guys,.
I installed a 11 GR 2 Oracle RAC (11.2.0.3) database, but I see the use of the feature of running parallel SQL queries, but I never used that.
I would like to know if this feature is enabled by default on CCR environments and if it does not require me to pay for Enterprise Edition.
NAME DETECTED_USAGES FIRST_USA LAST_USAG CURRE
---------------------------------------------------------------- --------------- ----- --------- ---------
Checking Options 1 TRUE 9 October 15 October 9, 15
BMG Auto setting 1 TRUE 9 October 15 October 9, 15
Memory of the execution of SQL auto 1 TRUE 9 October 15 October 9, 15
Automatic management of the space Segment (System) 1 TRUE 9 October 15 October 9, 15
Automatic Storage Management 1 TRUE 9 October 15 October 9, 15
Management of the Undo Automatic 1 TRUE 9 October 15 October 9, 15
Character set 1 TRUE 9 October 15 October 9, 15
Deferred Segment creation 1 TRUE 9 October 15 October 9, 15
Locally managed tablespaces (System) 1 TRUE 9 October 15 October 9, 15
Locally managed tablespaces (user) 1 TRUE 9 October 15 October 9, 15
Logfile multiplexing 1 TRUE 9 October 15 October 9, 15
Oracle Java Virtual Machine (System) 1 TRUE 9 October 15 October 9, 15
Oracle utility of metadata API 1 TRUE 9 October 15 October 9, 15
1 SQL query in parallel TRUE 9 October 15 October 9, 15
Partitioning (System) 1 TRUE 9 October 15 October 9, 15
Real Application Clusters (RAC) 1 TRUE 9 October 15 October 9, 15
Recovery zone 1 TRUE 9 October 15 October 9, 15
SECUREFICHIERS (System) 1 TRUE 9 October 15 October 9, 15
SECUREFICHIERS (user) 1 TRUE 9 October 15 October 9, 15
The parameter server file 1 TRUE 9 October 15 October 9, 15
Thanks in advance,
Franky

You are not, but Oracle is, since you are using RAC. Oracle relies on execution in parallel against the gv$ views so even if you can't use it in SE way common Oracle can when it comes to query against one of the points of view gv$. That's why DBA_FEATURE_USAGE_STATISTICS reports that you see.

David Fitzjarrell

Parallel parameter really reduce time for export?

Hi all;
I do realize too fast, if I use a parallel option when exporting.
As we know, the DIRECT PATH is much faster than the ACCESS EXTERNAL path.
With EXPDP reference documents.

When taking export using the parallel option, data access method would be 'EXTERNAL TABLE'

For large tables data pump always using external path rather than direct path.

in above case, if the size of the table in popular Go with "n" number of partitions, I can use parallel when the export option?
The version is 11.2.0.1 on RHEL

Hello

In this case, there are two types of parallel

external table 1) using a parallel query - what is likely to be slower in many cases only a process series using the direct path - query in parallel or single worker process usnig

(2) extract several tables "at the same time" and each made as direct path. -many workers all do another object at the same time

Thus, for example, that if you say Parallels 4, it is possible to get 4 datapump work process, each of these processes can extract another table at the same time, each of these excerpts is in the direct path,.

For most tables that's how it will work, if you use the query or you have some weird datatype or feature, then run the path may not be possible but in almost all cases of Parallels to export must be faster - because of the parallel unloading of objects.

Parallel queries to a single table for the external table access is generally slower.

Hope that makes sense...

See you soon,.

Rich

Query in parallel several caches

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