Performance when indexing table 1 d of table 2D

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• Register shift when indexing tables in formula node

  Hello

  I cannot using the node form while my two paintings of indexing.  I'm getting "NaN" for my output array. I think that the problem lies in my shift register.  My guess is that for the first calculation is not a PreviousAngle is why it gives me "NaN."  The first clue, I would like to than the value of PreviousAngle to 0. I'm new to LabView and know what to do.

  Thank you!

  Christian Seymour

  

  A 0 to the N terminal wiring makes no sense. A for loop will iterate for the smallest N or the size of the array. Don't wire anything to N.

• Performance problem when inserting in an indexed table space with JDBC

  We have a table named 'feature' that has a "sdo_geometry" column, and we created the spatial index on this column,
  
  CREATE TABLE (ID, desc varchar, sdo_gemotry oshape) feature
  
  CREATE INDEX feature_sp_idx ON feature (oshape) INDEXTYPE IS MDSYS. SPATIAL_INDEX;
  
  Then we executed following SQL to insert some 800 records in this table (we tried this using the DB Viewer and)
  our Java application, both of them were using JDBC driver to connect to the database oracle 11 g 2).
  
  insert into feature (id, desc, oshape) values (1001, xxx, xxxxx);
  insert into a values (id, desc, oshape) feature (1002, xxx, xxxxx);
  ...........................
  insert into a values (id, desc, oshape) feature (1800, xxx, xxxxx);
  
  
  We met the same problem as this topic
  Performance of the insert with spatial index
  It takes almost 1 dry for inserting a record, compared with 50 records inserted per second without spatial index.
  which is 50 x slow performance when you perform the insertion with the spatial index.
  
  However, when we copy and paste these scripts inserted in Oracle Client(same test and same table with spatial index), we got a completely different performance results:
  more than 50 records inserted in 1 seconds, as fast as the insertion without having to build the spatial index.
  
  Is it because that the Oracle Client not using JDBC? Perhaps JDBC has been something bad when updating of these tables indexed on the space.
  
  Edited by: 860605 09/19/2011 18:57
  
  Edited by: 860605 09/19/2011 18:58
  
  Published by: 860605 on 19/09/2011 19:00

  JDBC normally use autocommit. So each insert can leads to a commit.
  I know not all customer Oracle. In sqlplus, insert is just an insert,
  and you run "commit" to commit your changes explicitly.
  So maybe that's the reason.

• Start to monitor a whild using Index table?

  Thank you for taking my question!
  
  I have a very long running job and I first followed the clues he uses. Each index that I try to follow Gets a RESOURCE BUSY error when I try to change the index.
  
  
  Can someone tell me - is - this means that the index is in use OR you can not change the index when the table is in use?
  
  Thank you!
  Kathie

  You will need an exclusive lock on the table (or clue?-in this case, it's the same for me) to do ALTER INDEX MYINDEX CONTROL USE

  This means that you can not enable monitoring as long as there are other sessions/transactions performing DML against the table.

• Poor search performance clustered with table of singles (100 k)

  In a data entry project, I created a data type to store regular data. I have a cluster (see photo) which consists of a name, StringData, Numericaldata and ArrayOfSinglesData (predefined 100points k). Thus, every piece of data can be a scalar string, scalar number or an array of numbers.

  I then do a picture of this for all of my variables, maybe 150 or more.

  Works well, but the performance when adding new data (search for the exact name) is pretty poor.  Very high CPU and many even page faults for the slow connection like 1 to 10 times per second.

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  Given that I have 150 variable, as I thought a linear search should be ok, but probably the program moves also around 100 k singles for each comparison, or it's my idea at least.

  Can you suggest which is a good thing to do to improve performance?

  I added a search binary smarter, but it was necessary to sort variables, and since I have two names for each variable (called internal and external) that I use when you add, it helped only for half of the research.

  If I find the time I would like to divide the cluster so that all ArrayOfSingles are separated, but maybe you can tell me immediately if it is useful?

  (Labview, 2012sp1)

  Like Gerds link watch I suppose you're looping in the table looking for your name?

  I just tested, and using DVR to extract only the ID and grabbing then a single element are fast enough. I will attach my test so you can try it for yourself.

  /Y

• When a table has been removed

  Hello

  in 9i, is there a way to know when a table has been removed?

  Thank you.

  user10274093 wrote:

  Hello

  in 9i, is there a way to know when a table has been removed?

  Thank you.

  DBMS_LOGMNR

• Clear fields on the master page when fluid table goes to the second page

  Good then this is quite annoying, because I have no idea why this is happening.  In my form, I have 5 text fields that users are required to conclude the data personal (name, address, city, State and zip).  These 5 areas are on the master page 1.  I also have a master page 2, which was designed strictly for the flow on the text for a table of expenditure.  The expenditure table drains properly and I have no problems with the calculations but I noticed today that when the expenditure table throw on the second page, the data that the user entered in the 5 text fields clear when the table runs.

  Is this something I need to write code that said once the user leaves the field lock.  This does not seem as if it were necessary, given that many users who also make the fluid fields.

  I'm stumped, any help would be great.

  Thank you

  Hello

  Make sure that the binding for the five fields on the Master Page are set to Global (see object > range of liaison, when objects are selected).

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• How to list the when a Table is created, and when the last change?

  Is there a way to know when a TABLE was created originally, and when the last change (=. for example, the last INSERTION of a line or UPDATE a line)?
  
  Peter

  Hello!

  select created,last_ddl_time from dba_objects where object_type = 'TABLE' and object_name = 'table_name'
  

  created ways to create object (table)
  last_ddl_time means when the structure of tables was the last modified time

  But there no opinion with dml last on the table. You must provide this with a few columns on table (Last_dml_time) that should be filled with
  Some database triggers

  Or if you have enabled AUDITING, then last time dml is registered also in audit trail

  T

• When a table has been updated

  Hello
  in 10g, how see when a table has been finally updated?
  
  Thank you.

  Take a look at this post

  http://blog.tanelpoder.com/2009/02/07/when-was-a-table-last-changed/

  Coskan Gundogar

  http://Coskan.WordPress.com

• What causes the "specified operation cannot be performed when no device in the task.

          using (task NationalInstruments.DAQmx.Task = new NationalInstruments.DAQmx.Task ())
  
          {
  
            task. Timing.ConfigureSampleClock ("", 1000, SampleClockActiveEdge.Rising, SampleQuantityMode.FiniteSamples, 2);
  
            task. DIChannels.CreateChannel ("PXI1Slot6/Port2/Line3", "", ChannelLineGrouping.OneChannelForAllLines);
  
            task. Triggers.StartTrigger.ConfigureDigitalEdgeTrigger (triggerLine, DigitalEdgeStartTriggerEdge.Rising);
  
  DigitalSingleChannelReader reader = new DigitalSingleChannelReader (task. Stream);
  
            drive. ReadSingleSampleSingleLine();
  
          }

  Why the code above throws an exception DAQmx with message:

  "Specified the operation can only be performed when there are no devices in the task."

  task name: _unnamedTask<2>

  "Status code:-200477"

  There is a device in the task.  I'm trying to PXI1Slot6 (map of IO 6535) to enter the 2 samples off Port 2 line 3.

  Hi CurtisHx

  Thanks for reporting this. I agree that the error message returned by the driver is very unclear and fails to a user of the API provide enough information to determine the cause of the error in the code. In addition, it seems that we don't document the correct order of operations to set up a task well (the best thing we could find was the subject of tasks in NOR-DAQmx , who actually seems to imply that the channel configuration and their calendar can be made in any order). We are producing several bug reports, to fix / improve the following:

  • The error message returned by the driver to the API.
  
  
  • The help topic for the tasks in NOR-DAQmx.
  
  
  • The documentation of the specific method provided with the NOR-DAQmx .NET API.

  To clarify the error, it seems that 'peripheral' in ' specified operation cannot be performed when no device in the task "is in fact reference to the channels configured in the task. At this point, I'm not sure what "device" can be applied to other entities in the DAQmx driver software, but I'll post at the time where I have an error message created by the development team working on it.

  Best regards,

• Slow performance when multiple connected clients, WSM 6.0 x 64

  Slow performance when multiple connected clients, WSM 6.0 x 64

  Hello

  When users logs on, its quick and pleasant.

  However, when many connects, it slows down everything.

  The linked site server has basic 16 total, 24 GB of RAM, and 8 x 300 GB 10 k in RAID10 discs.

  I see the server is loading rather low, he got 4 x 1 Gbit/s in the lacp to a switch of concert team, then all switches have 1gig uplink.

  The server use never more than about 10 GB of RAM, this could be the problem and how to get the server to use more RAM?

  Total cpu load stay about 1 to 2%, network, all about 1500Mbps picks

  There is only one 25 GB os image file, and it slows down when all about 30-40 users open a session.

  This affect MaxSystemCacheMBytes? If I for example 1% or 200 MB, might lower it being 'forced' to spend more RAM?

  Screendump of x 64 connected site server

• ORA-12721: operation cannot be performed when other sessions are active

  Hello
  I started my database like this:

  1) Change INIT.ORA file;  unset parallel_server parameter.
  2) Execute these commands:
  STARTUP MOUNT ;
  ALTER SYSTEM ENABLE RESTRICTED SESSION;
  ALTER SYSTEM SET JOB_QUEUE_PROCESSES=0;
  ALTER SYSTEM SET AQ_TM_PROCESSES=0;
  ALTER DATABASE OPEN;
  SHUTDOWN IMMEDIATE;
  
  SQL> STARTUP RESTRICT  pfile='C:\oracle\product\10.2.0\db_1\database\initORCL.ora';
  ORACLE instance started.
  
  
  SQL> alter database national character set INTERNAL_CONVERT UTF8;
  alter database national character set INTERNAL_CONVERT UTF8
  *
  ERROR at line 1:
  ORA-12721: operation cannot execute when other sessions are active

  Sorry for the duplicate.
  
  Published by: user522961 on December 10, 2008 01:51

  >
  ORA-12721: operation cannot be performed when other sessions are active
  Cause: This command can only be run when there is no other active sessions
  Action: Ensure that there is no other connections to the database >
  HTH
  Aman...

• When creating index table lock?

  Hello
  
  My db is oracle10g. My database is OLTP system. I wanted to create the index on one of the table. The table has 200 million recordings.
  
  It locks the whole when table I create index? I think, its impact on the regular operations of the database when creating the index?
  
  Any help is appreciated...

  Hello

  You have Enterprise Edition? If so, the online option is available.

  So you can do:

  create index my_new_index on my_tab(col1,col2) online;
  

  or:

  alter index my_existing_index rebuild online;
  

  If you are not using the online option, then Yes, the table will be locked for updates, all traffic OLTP will serialize buttocks the index maintenance operation.

  Hope that helps,

  -Mark

• * ORA-00972: identifier is too long * when drop index table app

  Hello
  
  I had some difficulties with dropApplicationTableIndex. He raised an exception ORA-00972:
  java.sql.SQLException: ORA-00972: identifier is too long
  
  at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)
  at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:331)
  at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:288)
  at oracle.jdbc.driver.T4C8Oall.receive(T4C8Oall.java:745)
  at oracle.jdbc.driver.T4CStatement.doOall8(T4CStatement.java:210)
  at oracle.jdbc.driver.T4CStatement.executeForRows(T4CStatement.java:961)
  at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1190)
  at oracle.jdbc.driver.OracleStatement.executeUpdateInternal(OracleStatement.java:1657)
  at oracle.jdbc.driver.OracleStatement.executeUpdate(OracleStatement.java:1626)
  at oracle.spatial.rdf.client.jena.Oracle.executeUpdate(Oracle.java:769)
  at oracle.spatial.rdf.client.jena.GraphOracleSem.dropApplicationTableIndex(GraphOracleSem.java:3695)
  
  
  However, the longer name of my models is 23 characters, making it the longest name of characters 27A table (+ _TPL).
  Is there a still shorter limit for the length of model name?
  
  Thank you
  
  Kind regards
  Julien

  Hi Julien,

  In fact, the limit for a semantic model, created using the Jena adaptor is 19 characters. This is because the application table index uses TRIPLEIDX as a suffix.

  Best,
  Vlad

• Bad performance on a table partitioned range when you use sysdate

  I have a partition table with a DATE partition key column.
  Tables servs as a sliding window this is by adding a new partiotion for each day and dropping out of the older partitions.
  Each week, I generate a weekly report:
  SELECT... FROM MaTable WHERE part-key-column > SYSDATE-7;
  This query runs for about 5 hours
  
  When you use a hardcoded hard 'day' the query is finished about 4 times faster
  SELECT... FROM MaTable WHERE part-key-column > TO_DATE ('20100211', 'YYYYMMDD');
  
  any suggestion?
  
  Qry Plans:
  
  First Qry (poor):

  SQL> explain plan for SELECT * FROM dwh_net1.net_na_messw  WHERE dwh_net1.net_na_messw.mdate > trunc(SYSDATE - 7);
  
  EXPLAIN PLAN ausgeführt.
  
  SQL> select * from table(dbms_xplan.display);
  
  PLAN_TABLE_OUTPUT                                                                                                                                                                                                                                              
  ---------------------------------------------------------------------------------------------------------
  Plan hash value: 1311981634                                                                                                                                                                                                                                    
                                                                                                                                                                                                                                                                 
  ---------------------------------------------------------------------------------------------------------                                                                                                                                                      
  | Id  | Operation                | Name         | Rows  | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |                                                                                                                                                      
  ---------------------------------------------------------------------------------------------------------                                                                                                                                                      
  |   0 | SELECT STATEMENT         |              |  8479K|  3000M|  1975K (10)| 06:35:11 |       |       |                                                                                                                                                      
  |   1 |  PARTITION RANGE ITERATOR|              |  8479K|  3000M|  1975K (10)| 06:35:11 |   KEY |    61 |                                                                                                                                                      
  |*  2 |   TABLE ACCESS FULL      | NET_NA_MESSW |  8479K|  3000M|  1975K (10)| 06:35:11 |   KEY |    61 |                                                                                                                                                      
  ---------------------------------------------------------------------------------------------------------                                                                                                                                                      
                                                                                                                                                                                                                                                                 
  Predicate Information (identified by operation id):                                                                                                                                                                                                            
  
  PLAN_TABLE_OUTPUT                                                                                                                                                                                                                                              
  ---------------------------------------------------------------------------------------------------------                                                                                                                                                                                                            
                                                                                                                                                                                                                                                                 
     2 - filter("NET_NA_MESSW"."MDATE">TRUNC(SYSDATE@!-7))                                                                                                                                                                                                       

  Second (hardcoded, faster) Qry:

  SQL> explain plan for SELECT * FROM dwh_net1.net_na_messw  WHERE MDATE > to_date('12.02.2010','DD.MM.YYYY');
  
  EXPLAIN PLAN ausgeführt.
  
  SQL> select * from table(dbms_xplan.display);
  
  PLAN_TABLE_OUTPUT                                                                                                                                                                                                                                              
  ---------------------------------------------------------------------------------------------------------
  Plan hash value: 1311981634                                                                                                                                                                                                                                    
                                                                                                                                                                                                                                                                 
  ---------------------------------------------------------------------------------------------------------                                                                                                                                                      
  | Id  | Operation                | Name         | Rows  | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |                                                                                                                                                      
  ---------------------------------------------------------------------------------------------------------                                                                                                                                                      
  |   0 | SELECT STATEMENT         |              |  8479K|  3000M|   227K (10)| 00:45:30 |       |       |                                                                                                                                                      
  |   1 |  PARTITION RANGE ITERATOR|              |  8479K|  3000M|   227K (10)| 00:45:30 |    54 |    61 |                                                                                                                                                      
  |*  2 |   TABLE ACCESS FULL      | NET_NA_MESSW |  8479K|  3000M|   227K (10)| 00:45:30 |    54 |    61 |                                                                                                                                                      
  ---------------------------------------------------------------------------------------------------------                                                                                                                                                      
                                                                                                                                                                                                                                                                 
  Predicate Information (identified by operation id):                                                                                                                                                                                                            
  
  PLAN_TABLE_OUTPUT                                                                                                                                                                                                                                              
  ---------------------------------------------------------------------------------------------------------
                                                                                                                                                                                                                                                                 
     2 - filter("MDATE">TO_DATE('2010-02-12 00:00:00', 'yyyy-mm-dd hh24:mi:ss'))                                                                                                                                                                                 
                                                                                                                                                                                                                                                                 

  Published by: user10396457 on February 19, 2010 12:27

  Your two says plans are exactly the same. Are you sure that the elapsed time are different. Can you please set autotrace to traceonly and run two statements and send the output.