Similar Questions

• Index BITMAP and NOT NULL

  Hi all
  Is it possible to use the Index BITMAP for a NOT NULL condition?
  
  
  >
  
  CREATE a BITMAP of INDEX x_ix FOR tab (x);
  
  SELECT *.
  TAB
  WHERE x IS NOT NULL
  
  >
  
  Thank you!

  user3646231 wrote:
  You say that :) to hope

  Here it is:

  Your test is a good effort - but it needs a little more.

  Your question is "is it possible...". «, not "If Oracle always...» »

  Your demonstration showed an example where the choice of plan Oracle has surprised you (and me). Now, you need run the query with index indicator (because if the indexed access path is legal, must be taken an indexed correctly suggested path).

  I just ran a similar test (1 line of 100,000), with the following results:

  SQL> select * from table(dbms_xplan.display_cursor);
  
  PLAN_TABLE_OUTPUT
  ------------------------------------------------------------------------------
  SQL_ID  52q6gxkscvg9v, child number 0
  -------------------------------------
   select /*+ index(t1(n1)) */ * from t1 where n1 is not null
  
  Plan hash value: 2828957992
  
  ----------------------------------------------------------------------
  | Id  | Operation                    | Name  | Rows  | Bytes | Cost  |
  ----------------------------------------------------------------------
  |   0 | SELECT STATEMENT             |       |       |       |  1859 |
  |   1 |  TABLE ACCESS BY INDEX ROWID | T1    |     1 |   118 |  1859 |
  |   2 |   BITMAP CONVERSION TO ROWIDS|       |       |       |       |
  |*  3 |    BITMAP INDEX FULL SCAN    | T1_N1 |       |       |       |
  ----------------------------------------------------------------------
  
  Predicate Information (identified by operation id):
  ---------------------------------------------------
  
     3 - filter("N1" IS NOT NULL)
  

  You will notice that the cost of the query is unreasonable - and without the suspicion my test showed Oracle taking the full analysis at a much lower cost.
  If your test has actually demonstrated a bug in the costing, explaining why Oracle does not automatically take a path that seems reasonable.

  The above output comes from 11.2.0.3, but I had the same thing with 11.1.0.7

  Concerning
  Jonathan Lewis
  http://jonathanlewis.WordPress.com
  Author: core Oracle

• index bitmap and separate key

  Hi guys,.
  
  If the separate keys is very low (for example 20) and my index finger has more than 12,000 lines, should I consider using a bitmap index instead?
  
  Thank you

  OracleGuy777 wrote:
  But that say our table was very fragmented, would not--what it means that the bitmap index entries would be to store much more information than necessary? Say so we had a table with only 1000 entries and the first rowid is 1, and the last was 1000000 and then eventually we have 999000 additional entries for each bitmap index entry!

  Bitmap indexes are well compressed. So, this usually isn't a problem. An example...

  SQL> create table t as select rownum id from dual connect by level <= 1000000;
  
  SQL> execute dbms_stats.gather_table_stats(user,'t')
  
  SQL> select blocks from user_tables where table_name = 'T';
  
      BLOCKS
  ----------
        1557
  
  SQL> delete t where id between 500 and 999500;
  
  999001 rows deleted.
  
  SQL> commit;
  
  SQL> create bitmap index i on t (id);
  
  SQL> select distinct_keys, blevel, leaf_blocks from user_indexes where index_name = 'I';
  
  DISTINCT_KEYS     BLEVEL LEAF_BLOCKS
  ------------- ---------- -----------
            999          1           4
  

  Notice how the index has only 4 blocks of leaves...

  So you're saying something like

  FEMALE 1 0 0 0 1 1 0 1 0 1 0 1 1 1 1 0 0 1 0 0 0 1

  could be stored as

  FEMALE 1 0 0 0 1 1 0 1 0 1 for rowid a to j
  FEMALE 0 1 1 1 1 0 0 1 0 0 0 1 for rowid k - w

  Yes.

  HTH
  Chris Antognini

  Troubleshooting Oracle, Apress 2008 performance
  http://top.Antognini.ch

• B - Tree and explanation Index Bitmap

  Hi gurus

  I am trying to absorb the notion of bitmap index and b-tree, but unable to grasp the concept, so far, I have learned the following:

  Index B-Tree

  Use in the OLTP environment

  It is customary for these types of columns where you have more unique value or we can say that high cardinality

  It occupies less storage

  Using the corresponding model and ranges

  By default, Oracle uses tree indexing

  Bitmap index

  Use in home environment/OLAP data items

  It is customary for these types of columns where repeated values exist or we can say that low cardinality, example are male and female

  It seems that these points of difference between the two indexes. I really appreciate if someone give me more explanation on these subjects.

  Thanks in advance

  Concerning

  Muzz

  I am trying to absorb the concept index bitmap and tree but unable to grasp the concept,

  Then the FIRST place to look is the Oracle documentation; specifically the chapter "Index and Index-Organized Tables" chapter of the Concepts doc.

  http://docs.Oracle.com/CD/E25054_01/server.1111/e25789/indexiot.htm

  3 indices and Index of Tables

  This chapter deals with indices, which are schema objects that can speed up access to the lines of the table and organized index of tables, which are tables stored in an index structure.

  This chapter contains the following sections:

  • Overview of index
  • Overview of the Tables organized by Index

  This chapter has a lot of basic information on ALL the various types of indexes.

  so far, I've learned the following:

  Where, exactly, 'have you' who? Most of it is wrong, incomplete or distorted.

  Index B-Tree

  Use in the OLTP environment

  Index B-Tree, by default, are used in all environments.

  It is customary for these types of columns where you have more unique value or we can say that high cardinality

  They can be used for a cardinality. True - a unique column index is most commonly used for high-cardinality columns. But Oracle may also use an index column, simple or composite, when the data being sought is ENTIRELY contained in one or more indexes, low cardinality.

  It occupies less storage

  Maybe, maybe not. It is based on the column being indexed, the size of the key values and the cardinality of the key values. For your example "Male and female" there will be only THREE index entries: male, female and null. And each entry is simply a list of ranges of ROWID. This index can be orders of magnitude smaller than the equivalent B-Tree index.

  Using the corresponding model and ranges

  For the most part correct - although the range queries can be used with the bitmap index which is not a common use.

  By default, Oracle uses tree indexing

  Fix.

  Bitmap index

  Use in home environment/OLAP data items

  Especially correct - DML on tables with the bitmap index can cause severe performance and throughput problems. The distinction is therefore between environments with medium/high DML on a table compared to the weak or nonexistent DML on a table.

  So rather than a distinction between environments (OLAP and warehouse) the distinction is no longer between the TABLES (high/medium DML versus LOW/NO DML). There is nothing wrong at all with the help of the index of the bitmap in an OLAP environment - but these indices should be limited to the tables with low, or no, DML.

  It is customary for these types of columns where repeated values exist or we can say that low cardinality, example are male and female

  Yes and no.

  Yes - a bitmap index is not really appropriate, if there is NO repeat value.

  No - part II (low cardinality). The attribute MAJOR missing from what you have posted is that bitmap indexes are ALMOST always used in conjunction with others (usually a bitmap) index.

  If one, or more, high cardinality bitmap index can be used VERY effectively together to identify a set of rows to a query.

  See my multiple responses in this thread

  https://community.oracle.com/message/10219613?

  One of my answers presents, in detail, just how many attributes can be combined using several bitmap on both high columns index and low cardinality.

  In a later response, I provide the actual sample code and display the execution plan indicating how Oracle just that.

  SQL> set serveroutput on
SQL> set autotrace on explain
SQL> select rowid from star_fact where
  2   (state = 'CA') or (state = 'CO')
  3  and (age = 'young') and (marital_status = 'divorced')
  4  and (((summer_sport = 'baseball') and (softdrink = 'pepsi'))
  5  or ((summer_sport = 'golf') and (beer = 'coors')));


  Read the full thread.

• convert 9i enterprise standard edition on win2000

  Hello
  I want to convert a 9i enterprise edition on Windows 2000 standard edition on the samebox (win2000)
  
  my plan is to the standard edition on a new home of configuration and then create a new database, and then export and import
  
  What is the best way to do it?
  
  also, I went and installed the Standard Edition version on a new home
  but when I click on the wizard of DB configuration on the new House, he embarks
  He only started from the old "company" home
  I went to prompt back and
  
  ORACLE_HOME = C:\ORA9ISE SET
  C:\ora9iSE\bin\launch.exe c:\ora9iSE\assistants\dbca dbca.cl
  
  
  but still the DBCA don't throw!
  
  Any ideas why the dbca not start?
  
  Thank you

  The safest way is your initial proposal; export & import

• Which switch to index for the index bitmap in Oracle Standard Edition

  Hello
  
  I have to move from Oracle Enterprise edition to standard edition (oracle11g). As standard edition does not support bitmap indexes. But the current database which is an Enterprise edition a bitmap index a column-based date or varchar2 or column in a table. The tables have approximately 60000000 records. I would like to know what index go for bitmap index.
  
  
  Kind regards
  Vaibhav
  
  Published by: Vaibhav on November 7, 2011 05:35

  The BTree index certainly can and are frequently used when values are not unique (e.g. are duplicated).

  uniqueness isn't the issue. The relative number of distinct values (relative to the total number of lines) is important. An advantage of BitMap index BTree indexes, it's that BTree indexes can be composite - made up of multiple columns.

  You can read the documentation on the index.

  http://download.Oracle.com/docs/CD/E11882_01/server.112/e25789/indexiot.htm#CBBECABB

  http://download.Oracle.com/docs/CD/E11882_01/server.112/e25494/indexes.htm#i1007132

  Hemant K Collette

• Difference between Enterprise Edition and Standard Edition for Oracle RAC

  Hello
  
  In our current configuration we have CARS on standard edition and customer is now considering to go to Enterprise Edition, but not yet to decide because of the cost.
  
  Is there a difference between the Infrastructure of grid 11gR 3 Enterprise edition and Standard Edition?
  
  They told me first install Enterprise Edition and then will move to Standard Edition if they can not get the EA license, so in this case do I have to re - install standard edition network infrastructure?
  
  
  
  Kind regards
  Chirag

  994551 wrote:
  Hello

  In our current configuration we have CARS on standard edition and customer is now considering to go to Enterprise Edition, but not yet to decide because of the cost.

  Is there a difference between the Infrastructure of grid 11gR 3 Enterprise edition and Standard Edition?

  They told me first install Enterprise Edition and then will move to Standard Edition if they can not get the EA license, so in this case do I have to re - install standard edition network infrastructure?

  Hello

  There is no "grid Infrastructure 11gR 3 Enterprise edition and Standard Edition", is the only Infrastructure of grid 11 GR 2.

  On the Oracle Clusterware licenses (grid Infrastructure).
  At least one of the servers in the cluster is allowed for the Oracle database (SE1, SE or EE)
  A cluster is defined to include all machines that share the same Oracle Cluster Registry (OCR) and the drive to vote.
  http://docs.Oracle.com/CD/E11882_01/license.112/e10594/editions.htm#CJAHFHBJ

  On the licensing database.
  http://www.Oracle.com/us/products/database/Enterprise-Edition/comparisons/index.html

  Note: Oracle Real Application Clusters (Oracle RAC), is an option to Oracle Database 11 g Enterprise Edition and included with Oracle Database 11 g Standard Edition (on clusters with a maximum of 4 Sockets).
  If you move to EA Oracle, you must purchase a separate license to use the RAC option

  Regarding the Installation:
  Nothing changes on your current installation of Grid Infrastructure 11.2
  Just install a new fresh install to choose EF of the Oracle (the current clusterware) database during installation. Configure services database from this new HOME of ORACLE. Change anything on the database of all the previous backup and used functionality remains unchanged. With the help of this new House Oracle new features are enabled to be used by your databases.

  On the Downgrade:
  Step by step procedure to perform the conversion from Enterprise Edition to edition Standard [ID 465189.1]

• Business of medium scale and Standard Edition One

  DB version: 11 GR 2
  Our client (a company average scale) wants to buy Standard Edition One. From the below URL I've read that it costs $180 per user.
  http://www.Oracle.com/us/products/database/STD-one/index.html
  
  What does that mean? Our client has 600 end users who use a Java application that connects to this database.
  Fees that means that our customer has to pay 600 * 180 = 108000 USD as license?

  Hello
  No don't worry about it! Other Oracle products, it can be licensed by CPU (actually by taking a multicore CPU is considered 1 CPU SE and SE1)
  https://shop.Oracle.com/pls/ostore/f?p=ostore:product:1960908607185564:no:RP, 3:P3_LPI, P3_PROD_HIER_ID:4508969204091805719879, # 4509958287721805720011
  Best regards
  Phil

  Published by: Philippe Florent on February 19, 2011 09:38 - added precision

• I have windows server 2008 standard Edition and I need to convert an iso file in a wim file, so I can load in windows deployment services.

  Original title: iso to wim

  I have windows server 2008 standard Edition and I need to convert an iso file in a wim file, so I can load in windows deployment services.

  Thank you

  Because you are dealing with Windows Server 2008, I suggest that you go on the TechNet forums and re after your question here. They are better equipped to help you with questions regarding the problems of Windows Server.

  Thank you!

• IHAVE windows server 2008 standard Edition, but we want to improve it to Enterprise Edition and save the elders allowed other servers how do I do this Action

  Dear Sir
  I have windows server 2008 standard Edition, but we want to upgrade to Enterprise Edition and save old licenses to other servers how do I do this Action

  Thank you in advance

  Hello

  You can find the Server forums on TechNet support, please create a new post at the following link:

  http://social.technet.Microsoft.com/forums/en/category/WindowsServer/

• Difference between standard edition SQL and SQL workgroup edition

  I'm buying the processor SQL License. I'm looking for the standard edition of SQL, but the SQL workgroup edition is less expensive. I wonder what the difference is in two versions

  Hi DBBurns,

  This document compares the editions of SQL and should answer your question. If you need help, your questions there will be better answered in the Forums of SQL.

• Difference between Standard 10g and 11g Standard edition.

  Hi all

  I tried Googling to find the difference between the Standard of 10g and 11g Standard editions, but couldn't find what I want.

  Y at - it links you want to share.

  Thank you

  Hello

  I tried, please check

  http://docs.Oracle.com/CD/B19306_01/license.102/b14199/editions.htm#BABJICBB (10 G based on the edition functions)

  http://docs.Oracle.com/CD/B28359_01/License.111/b28287/Editions.htm#DBLIC116 (11 g features based on edition)

  Just compare the two.

  Hope that helps.

  -Thank you

  Pavan Kumar N

• MPIO, ALUA and Vsphere Standard Edition

  I'm having a hard time to give a sense of the differences in features between Vsphere standard Edition and enterprise Edition when it comes to storage.   In the comparison of the features he says that this standard does not support third-party plugins or MPIO.  But I know that at least, it supports MPIO basis because I have it running on one of my sites with ISCSI.    So I'm I wondered what exactly it does not support and more particularly wonder about MPIO on SAN FC who wants me to activate ALUA.

  Take a look at VMware KB: frequently asked Questions for the vStorage API for integration of the table that describes the functions available with VAAI.

  ALUA and the MPIO built-in will work regardless of the edition, you can simply use 3rd party software.

  André

• Documaker 12.1 Standard Edition and Microsoft SQL Server

  Does it matter which version of Microsoft SQL Server that uses Documaker 12.1 Standard edition and may documaker using the latest version?  Is there a particular version of Microsoft SQL Server that is running better with Documaker?

  Documaker uses ODBC for most SQL connectivity. The application is therefore probably not aware (and indifferent) with the specific version of SQL Server, you have installed.

• How to find the difference between standard edition and standard edition one

  How to find the difference between oracle database standard edition and standard edition one 64 bit
  
  (a) using sql
  (b) using the configuration/installation files

  How to find the difference between oracle database standard edition and standard edition one 64 bit

  (a) using sql

  Select * the option of $ v;

  (b) using the configuration/installation files

  opatch lsinventory-details