Query on the organized Table (IOT) Index sorts unnecessarily data

Similar Questions

• Help with a query on the HRMS tables

  I need assistance with a request that I'm running. Here are two tables that I'm trying to join:
  
  PER_ALL_POSITIONS
  PER_ALL_PEOPLE_F
  
  What I'm trying to accomplish is to get the first name, last name by PREPtable ALL_PEOPLE_F and then join the PER_ALL_POSITIONS table to get a unique list of positions. However what I need help for is to determine how to join the two tables. I know that the primary key on PER_ALL_PEOPLE_F is Person_ID but this value does not appear in the table PER_ALL_POSITIONS. Could someone give me any advice would be greatly appreciated. :)

  you need go to per_all_assignments_f, then to per_all_positions per_all_people_f.

• Rows from the outer Table shows only not all data.

  Hello
  
  I have a line to 80 characters that I import in an external table.
  
  80% imports fine line data, but some lines are cut.
  
  The bytes in the file are as follows.
  ABCABC2334 0000001000010000001000000001 000000 00001C A002
  
  Bytes in an external table.
  ABCABC2334 0000001000010000001000000001 000000 A002
  
  The bytes in the row of the outer table stop somewhere at the end of 000000 and the 00001C is cut.
  
  What build be the cause of this?
  
  I am able to read the characters at the beginning and towards the end of the record of 80-character line.
  
  The external file below performs the following operations.
  ABCABC2334 0000001000010000001000000001 000000 01B A002
  
  I can even make a definition of the external table (c1 char (1), c2 char (1),... c80 (1) tank and all the characters see fine in the specified columns.)
  
  Here is the last definition of the external table. The "middle" column still shows this behavior. Basically, it is in the file and can be seen with every character in the definined line, but not as a group of characters.
  
  DB CHARACTERSET WEBISO8859P1
  
  CREATE TABLE EXT_PROJ_1
  (
  Field1 tank (6 BYTES),
  Field2 float (4 BYTES),
  medium (67 BYTES)
  field3 tank (3 bytes),
  CR tank (2 bytes)
  )
  EXTERNAL ORGANIZATION
  (TYPE ORACLE_LOADER
  THE DEFAULT DIRECTORY EXP_DIR
  ACCESS SETTINGS
  (
  RECORDS delimited by '\r\n '.
  FIELDS (field1, position(1:6),
  position(7:10) Field2.
  average position(11:77)
  field3 position(78:80).
  CR position(81:82)
  )
  )
  LOCATION (EXP_DIR: 'ext_proj_1.txt')
  )
  REJECT THE LIMIT 1
  noPARALLEL
  NOMONITORING;
  
  Published by: 917320 on March 13, 2012 09:07

  Looking at your table definition:

  field1 char(6 BYTE),
  field2 char(4 BYTE),
  middle char(67 BYTE),
  field3 char(3 byte),
  cr char(2 byte)
  

  column in which you will store a string of 80 bytes?

  BTW: You said "import into an external table." You import FROM an external table or EXPORT to an external table?

• See the empty table if there is no data

  Hello
  I have a line chart in a dashboard page, which shows sales of the company in a given country (chosen by guest). When I choose a country that has no data, the system displays message: "no results - specified criteria result in all data. I want that in this scenario, appears an empty array. Is it possible? How do I change my application? Thank you
  
  Giancarlo

  OK, in this case, you must change the join in the repository. Let's say you have a table 'months' and a fact table. Join the two tables, but use a right join (where the table is the table with the months). This way, you will get all values in the table of months, associated with the data in the fact table. During these months does not, you will see the value null. You can set a zero with a case statement.

  I hope this helps.
  J. -.

• Assemble the different tables with large amounts of data

  Hello
  
  I need to collect different types of tables:
  
  Example "table1", with columns: DATE, IP, TYPEN, X 1, X 2, X 3
  For "table0" with the DATE, IP, REFERENCE columns.
  
  TYPEN in table1 to be inserted in REFERENCE in table0, but by a function that transforms it to another value.
  
  
  There are several other tables like 'table1', but with slightly different columns, which must be inserted into the same table ("table0").
  
  The amount of data in each table is pretty huge, so the procedure must be made into small pieces and effectively.
  
  If / could I use data pump for this?
  
  
  Thank you!

  user13036557 wrote:
  How can I continue with this then?

  Should I delete the columns I don't need and transform the data in the first table, and then use data pump.

  or should I just do a procedure traversing all ranks (into small pieces) "table1", then threading "table0"?

  You have two options... Please test both of them, calculate the time to complete and to implement the best.

  Concerning
  Rajesh

• Against the same table, similar index result in very different performances

  Hi guys,.
  
  31%
  

  create table TRACING_0727
  (
    ID             CHAR(36) not null,
    CALL_ID        CHAR(36) not null,
    CALLER_ID      VARCHAR2(100) not null,
    TIME_STAMP     VARCHAR2(50) not null,
    PACKAGE_NAME   VARCHAR2(30),
    PROCEDURE_NAME VARCHAR2(30),
    BEGIN_DATE     TIMESTAMP(6) not null,
    END_DATE       TIMESTAMP(6),
    EXCEPTION_TXT  VARCHAR2(500)
  )
  ;
  -- Create/Recreate primary, unique and foreign key constraints 
  alter table TRACING_0727
    add constraint TRACING_0727_PK primary key (ID);
  -- Create/Recreate indexes 
  create index TRACING_0727_IX on TRACING_0727 (CALL_ID); 

  After reboot, I have run below the statement that costs me about 1 second. And this statement uses TRACING_0727_PK:

  select count(*) from enterprise_tracing_0727;

  After another reboot, I run below the statement that is forced to use TRACING_0727_IX, and it takes about 30 seconds:

  select /*+index(tracing_0727 TRACING_0727_IX)*/ count(*) from tracing_0727;

  The table about 400000 lines and the oracle server is on my laptop, the server is not busy. The field ID and CALL_ID are both a string GUID.
  In my opinion, these 2 indices are similar, and their size must be similar too, since count (*) select will make the analysis of the overall index, the performance of these 2 sql should be similar, but why they are so different in my test? I test several times and each time I get the same result.
  
  Thanks in advance.

  Hi Serge

  Yes, the reason is that the first query is using an Index fast Full Scan and by reading diluvium (fast), while the second uses a Full Index Scan and by reading one piece (slow).

  You must change the flag to an INDEX_FFS hint to get the second clue to also use a FFS.

  See you soon

  Richard Foote
  http://richardfoote.WordPress.com/

• SELECT query time-out - huge table

  DBA dear friends,

  
  

  DB version 11.1.0.7.  I have a SELECT query that is running long and wedging on. Query joins the 2 tables. It is partitioned hash (16 sheets) and others are not partitioned, each table is with the same volume of data - 230 million lines.

  > Optimizer stats are not outdated

  SELECT only 1 row (as indicated in the PLAN of EXPLAIN) should be fast.

• How to compare the length of the data to a staging table with the definition of the base table

  Hello
  I have two tables: staging of the table and the base table.
  I get flatfiles data in the staging of the table, depending on the structure of the requirement of staging of the table and the base table (length of each column in the staging table is 25% more data dump without errors) are different for ex: If we have the city long varchar 40 column in table staging there 25 in the base table. Once data are discharged into the intermediate table that I want to compare the actual length of the data for each column in the staging table with the database table definition (data_length for each column of all_tab_columns) and if no column is different length that I need to update the corresponding line in the intermediate table which also has an indicator called err_length.
  
  so for that I use the cursor c1 is select length (a.id), length (b.SID) of staging_table;
  c2 (name varchar2) cursor is select data_length all_tab_columns where table_name = 'BASE_TABLE' and column_name = name;
  But we get atonce data in the first query while the second slider, I need to get for each column and then compare with the first?
  Can someone tell me how to get the desired results?
  
  Thank you
  Manoi.

  Hey, Marco.

  Of course, you can set src.err_length in the USING clause (where you can reference all_tab_columns) and use this value in the SET clause.
  It is:

  MERGE INTO  staging_table   dst
  USING  (
         WITH     got_lengths     AS
                   (
            SELECT  MAX (CASE WHEN column_name = 'ENAME' THEN data_length END)     AS ename_len
            ,     MAX (CASE WHEN column_name = 'JOB'   THEN data_length END)     AS job_len
            FROM     all_tab_columns
            WHERE     owner          = 'SCOTT'
            AND     table_name     = 'EMP'
            )
       SELECT     s.ename
       ,     s.job
       ,     CASE WHEN LENGTH (s.ename) > l.ename_len THEN 'ENAME ' END     ||
            CASE WHEN LENGTH (s.job)   > l.job_len   THEN 'JOB '   END     AS err_length
       FROM     staging_table     s
       JOIN     got_lengths     l     ON     LENGTH (s.ename)     > l.ename_len
                           OR     LENGTH (s.job)          > l.job_len
       )     src
  ON     (src.ename     = dst.ename)
  WHEN MATCHED THEN UPDATE
       SET     dst.err_length     = src.err_length
  ;
  

  As you can see, you have to hardcode the names of the columns common to several places. I swam () to simplify that, but I found an interesting (at least for me) alternative grouping function involving the STRAGG user_defined.
  As you can see, only the subquery USING is changed.

  MERGE INTO  staging_table   dst
  USING  (
         SELECT       s.ename
         ,       s.job
         ,       STRAGG (l.column_name)     AS err_length
         FROM       staging_table          s
         JOIN       all_tab_columns     l
        ON       l.data_length  < LENGTH ( CASE  l.column_name
                                            WHEN  'ENAME'
                                  THEN      ename
                                  WHEN  'JOB'
                                  THEN      job
                                     END
                             )
         WHERE     l.owner      = 'SCOTT'
         AND      l.table_name     = 'EMP'
         AND      l.data_type     = 'VARCHAR2'
         GROUP BY      s.ename
         ,           s.job
         )     src
  ON     (src.ename     = dst.ename)
  WHEN MATCHED THEN UPDATE
       SET     dst.err_length     = src.err_length
  ;
  

  Instead of the user-defined STRAGG (that you can copy from AskTom), you can also use the undocumented, or from Oracle 11.2, WM_CONCAT LISTAGG built-in function.

• Name of the dynamic table is possible?

  Hi guys,.
  
  I have fact tables every day with the same structure, each table in a day: fact20090701, fact20090702 etc.
  Every night a new table is created.
  
  Database is Oracle.
  
  I need a single command prompt date and then run a query on the corresponding table.
  
  Is this possible?
  
  Direct application of the database is not an option.
  
  Thank you
  Alex

  Hello

  In the physical layer, go to table special and double click on it (go to properties) > general tab.
  You will find the option use dynamic names. When you click on this it asks the name of the variable.

  so, you must create a session variable that contains the dynamic value. And use it here...
  SQL is something like: SELECT 'fact' | to_char (sysdate, 'yyyy') | to_char (sysdate, 'mm') | to_char (sysdate, 'dd') block initialization
  assign it some variable... He uses...

  Hope this helps you...

• Data showing not as in the physical table

  Hello guys

  I have a weird problem to me. in the physical table, there "0" in the TIME_BY_DAY_KEY column and 'null' in FULL_DATE column.in the fact table, I, there are '0' data, why we add a new column that is '0'.

  see this captured screen:

  

  but in my BI screen shows different like this:

  

  data must demonstrate 'null' not ' 0/0/0 12: 00'.

  guys, we all know that before? is this related to the CACHE?

  any suggestions, I really appreciate it.thanks guys.

  If your column can be null in OBIEE? Have you checked the box in the physical layer?

• When you perform the query from the query, it assumes that the field is numeric

  I have a query that has 30 some files inside from an AS400 file. Now, when I do a query on the query, he thinks one of the columns is a numeric field, even if it is not. Now I do the same thing with another query (with the same file and fields, just different data) and it works fine.
  
  This is the error I get: the 73 "d" value cannot be converted to a number
  
  This column looks like this for example
  75
  75
  71
  71
  75
  73
  75
  63%
  etc. (the 73D is the only one in this column)
  
  Now in the query of queries I question not even this field (there are about 10 fields in the query, and I want the results of one) and then I get the above error. Any ideas?
  
  Thanks in advance,
  CJ

  CJ wrote:
  > I have a query that has 30 some files inside from an AS400 file. Now when I do

  you create the original query? If so, create the AND define the data types:

  newQ = QueryNew ("user, lastLogin, manager", "varChar, time, bit");

  > a query on the query, he thinks one of the columns is a digital, same field
  > if it's not. Now do the same thing with another application (with the same file
  (> and fields, just different data) and it works fine.
  >
  > This is the error I get: the 73 "d" value cannot be converted to a
  > number
  >
  > This column looks like this for example
  > 75

  CF will build the query result based on the first line of data (if you are not
  define the data types in the original query), which resembles digital data.

  > 73D

  Thus, when it hits this row it will fail.

  If you do not use the data in that column, and then not put it back. Otherwise, use it.
  Method CAST dan suggested.

• Index organized Tables

  What is logical rowid in IOT? are they kept physically somwhere like physical rowId
  
  What are secondary indexes?
  
  what he meant by leaves block splits? When and how it happens?
  
  and the primary key for a table in index constraint cannot be abandoned, delayed or off, is this true, if yes then Y
  
  How overflow works? how the two clauses are implemented PCTTHRESHOLD and INCLUDING.how they work?
  
  Published by: Juhi on October 22, 2008 13:09

  I'm sort of tempted to simply point you in the direction of the official documentation (concepts guide would be a start. See http://download.oracle.com/docs/cd/B28359_01/server.111/b28318/schema.htm#sthref759)

  But I would say one or two other things.

  First, physical ROWID not is not physically stored. I don't know why you would think they were. Certainly the ROWID data type can store a rowid if you choose to do, but if you do something like "select rowid from scott.emp", for example, you will see the ROWID that are generated on the fly. ROWID is a pseudo-column, not physically stored anywhere, but calculated each time as needed.

  The difference between a physical rowid and logic used with IOT boils down to a bit of relational database theory. It is a rule in melting of relational databases that a line, once inserted into a table, must never move. In other words, the identifier that is assigned at the time of his first insertion, must be the rowid he "keeps" for ever and ever. If you ever want to change the assigned lines in an ordinary table ROWID, you must export them, truncate the table, and then reinsert them: Insert charges, fees rowid. (Oracle bend this rule for various purposes of maintenance and management, according to which 'allow the movement of line"allows lines without a table, but the general case is still valid for most).

  This rule is obviously hopeless for the index structures. It was true, an index entry for "Bob" which is updated to "Robert" would find next to the entries for 'Adam' and 'Charlie', even though she now has a value of 'R '. Effectively, 'line' a 'b' in an index must be allowed to "move" a sort of 'r' of the block if it's the kind of update that takes place. (In practice, an update to an index entry consists of performing a delete followed by a re - insert, but the physicalities do not change the principle: 'lines' in an index must be allowed to move if their value is changed; rows of a table do not move, no matter what happens to their values)

  An IOT is, at the end of the day, simply an index with columns much more in it that a 'normal' index would - he, too, has thus allow its entires (his 'rows', if you like) to move. Therefore, an IOT cannot use a standard ROWID, which is assigned only once and forever. Instead, one must use something that takes into account that its lines may wander. It's the logical rowid. It is not more 'physical' as a physical rowid - or are physically stored anywhere. But a 'physical' rowid is invariable; a logic is not. Logic, it is actually built in part of the primary key of the ITO - and this is the main reason why you can never get rid of the primary key on the IOT constraint. Be allowed to do would be to you to destroy an organizing principle for its content which has an IOT.

  (See the section called "The virtual ROWID" and continued on this page: http://download.oracle.com/docs/cd/B28359_01/server.111/b28318/datatype.htm#CNCPT1845)

  IOT so their data stored inside in the primary key order. But they only contain the primary key, but all the other columns in the definition of 'table' too. Therefore, just as with an ordinary table, you might sometimes find data on columns that are NOT part of the first key - and in this case, you might well these columns non-primary keys are indexed. Therefore, you create ordinary index on those columns - at this point, you create an index in an index, really, but it's a secondary question, too! These additional indices are called 'secondary index', simply because they are "subsidiary clues" in the main proceedings, which is the 'picture' himself laid out in the primary key order.

  Finally, a split block of sheets is simply what happens when you have to make room for the new data in an index block which is already filled to overflowing with the existing data. Imagine an index block may not contain four entries, for example. Fill you with entries for Adam, Bob, Charlie, David. Now, you insert a new record of 'Brian '. If it's a table, you can take Brian to a new block you like: data from a table have no positional sense. But the entries of an index MUST have positional significance: you can't just throw MC Bean and Brian in the middle of a lot of Roberts, bristling. Brian DOIT pass between the existing entries for Bob and Charlie. Still you can not just put him in the middle of these two, because then you'd have five entries in a block, not four, which we imagined for the moment to be maximally allowed. So what to do? What you do is: get an empty block. Move Charlie and David entries in the new block. Now you have two blocks: Adam-Bob and Charlie David. Each has only two entries, so each has two 'spaces' to accept new entries. Now you have room to add in the entry for Brian... and if you end up with Adam-Bob-Brian and Charlie David.

  The process of moving the index entries in a single block in a new one so that there is room to allow new entries to be inserted in the middle of existing ones is called a split of block. They occur for other reasons too, so it's just a brilliant of them treatment, but they give you the basic idea. It's because of splits of block that indexes (and thus IOT) see their 'lines' move: Charlie and David started in a single block and ended up in a completely different block due to a new (and completely foreign to them) Insert.

  Very well, infinity is simply a means of segregation of data in a separate table segment that would not reasonably be stored in the main segment of the ITO himself. Suppose that you are creating an IOT containing four columns: one, a digital sequence number; two, a varchar2 (10); three, a varchar2 (15); and four, a BLOB. Column 1 is the primary key.

  The first three columns are small and relatively compact. The fourth column is a blob of data type - so it could be stored whole, multi-gigabyte-size monsters DVD movies. Do you really want your index segment (because that's what an IOT really is) to ball to the huge dimensions, every time that you add a new line? Probably not. You probably want 1 to 3 columns, stored in the IOT, but column 4 can be struck off the coast to a segment on its own (the overflow segment, actually) and a link (in fact, a physical rowid pointer) can bind to the other. Left to himself, an IOT will cut each column after the a primary key when a record that threatens to consume more than 50% of a block is inserted. However, to keep the main IOT small and compact and yet still contain data of non-primary key, you can change these default settings. INCLUDE, for example, to specify what last non-primary key column should be the point where a record is split between "keep in IOT" and "out to overflow segment." You could say "INCLUDE COL3" in the previous example, so that COL1, COL2 and COL3 remain in the IOT and only COL4 overflows. And PCTTHRESHOLD can be set at, say, 5 or 10 so that you try to assure an IOT block always contains 10 to 20 saves - instead of the 2 you would end up with default if 50% of kicks.

• Need help on rewriting query for the DOMAIN CONTEXT index

  Hello
  
  I'd be really grateful if someone could give me a tip how to rewrite the query so that the DOMAIN INDEX is executed as the last and not the first... According to the plan to explain it...
  
  What I want: I want to index FIELD CONTAINS search for text ONLY for ITEMS that are extracted from the inner query (table MS_webarticlecache)...
  
  Because it seems now DOMAIN INDEx is executed first on all the MS_ARTICLE table and then filtered by inner query ID's...
  
  This query execution time is now around 86seconds... Inner query has all the indexes for SID_SUBCLIPPING and DATE_ARTICLE... (seen in line 3 of explain plan) If this one is fast and returns the unique id by grouping it and concating keywords...
  
  Without text... search results are retrieved in 3 seconds...
  
  DOMAIN index is created with Oracle 11 g FILTER BY ID, ART_DATE... and is on the MS_ARTICLE table and the ORATEXT seen on the sql column...
  
  Table MS_ARTICLE has 1.8mil lines...
  MS_WEBCACHEARTICLE table has cca. 2 lines of millet
  
  
  SQL:
  SELECT A.*, B.KEYWORDS OF
  MS_ARTICLE HAS
  JOIN THE
  (SELECT be, wm_concat (keywords) "KEY words" FROM MS_webarticlecache WHERE SID_SUBCLIPPING IN ('LEK', "KRKA") AND DATE_ARTICLE > = TRUNC(SYSDATE-400) AND DATE_ARTICLE < = TRUNC (SYSDATE) GROUP BY be) B
  WE
  A.ID = B.ID_ARTICLE AND CONTAINS (A.ORATEXT, 'IMMUNAL', 1) > 0
  
  Here is explain plan:
  Plan
  SELECT STATEMENT ALL_ROWSCost: 1 K bytes: cardinality K 16: 237
  1 FIELD INDEX INDEX (DOMAIN) PRESCLIP. ART_IDX cost: 120
  TABLE 2 ACCESS BY INDEX ROWID TABLE PRESCLIP.MS_ARTICLE cost: cardinality K bytes: 5 775: 237
  3 INDEX RANGE SCAN INDEX PRESCLIP. WEBCACHE_SUBCLIPDATE cost: cardinality 10: 964
  TABLE ACCESS BY INDEX ROWID TABLE PRESCLIP.MS_WEBARTICLECACHE cost 4: 250 octets: 45 K cardinality: 931
  5 INLIST ITERATOR
  Cost of 6 HASH JOIN: 1 K bytes: cardinality K 16: 237
  7 FILTER
  GROUP 8 SORT BY cost: 1 K bytes: cardinality K 16: 237
  
  
  Thank you very much for the help.
  Kris

  No, dbms_stats.gather_index_stats should be enough I think. From RECONSTRUCTION vs FULL - on rebuilding mode Oracle rebuilt just the table $I from scratch (it creates a temporary table, fills and then current exchanges and the new tables). It should be much faster that the FULL optimization, where the picture remains the same and only its content changes. The resulting table will be more compact, too.

• Delete Performance index organized Tables

  Hello
  
  We are experiencing some performance problems with one of our tables.
  
  We have a table (test), which contains 9 columns:
  
  A number (10) not null not pk,.
  B number (10),
  C number (10),
  D number (10),
  E number (10),
  F varchar2 (30),
  F varchar2 (2),
  G varchar2 (2),
  H varchar2 (250).
  
  The table test is an ITO (Index Organized Table) in configuration of default ITO.
  All columns are often necessary for we can not all overflows.
  
  The table has currently 8 m records, which is roughly 1/2 years of a data value, so insignificant.
  Inserts and updates are fine, but it takes 40 + seconds to delete a single line!
  
  (remove test where a = 3043 ;))
  
  If I convert this table in a standard table, deletes are only 0.5 of a second?
  
  No idea why the delete statement takes an excessively long time on the IOT, or what I could do wrong?
  
  Thank you
  Victoria
  
  Oracle Enterprise version 10.2.0.1.0
  Oracle XE version 10.2.0.1.0

  It seems as if the PK on this table of ITO is referenced by a FK on a child table (big enough) but the FK does not have an associated index.

  Deleting a line in this table, Oracle is required to perform a FTS on the child table to make sure that there is no matching FK.

  Find out if you have indeed a FK that refers to this table, and if CF is indexed.

  Just a guess, of course. A long track during the delete operation should be noted where Pio come just to be sure.

  See you soon

  Richard Foote
  http://richardfoote.WordPress.com/

• Why slow DML in Index organized tables

  I learned that ITO system was not suitable for tables that have a high volume of DML operations.
  
  I want to know that:
  
  1.) why DML operations are slow when we have data and indexes in the same place for ITO?
  2.) why we take extra precautions for fragmentation to ITO that pile of paintings organized?

  It's as long as your application does not change for the PK values that inspire you the IOT.

  If you have an application that actually modifies the values of primary key - Ouch!

  Here's how to think this through:
  Think of an Index on a column usually.
  What happens when you update the value of this column for a line or set of lines?
  The update to the line goes into the table block (and if the line does not expand or PCTFREE is adequate, there is no chaining line)
  However, the update of the index entry is not just an update. Because an Index is a Structure y (unlike a heap table), in order to change the value of an Index key (even when not unique), you have to 'remove' of the 'location' (IE block) he currently resides to and "insert" in the new "place" (block) corresponding to the new value. So, for example, if change 'Aman' (probably at the head of the Index tree) to "Hemant" (somewhere in the middle), you will find that "Hemant" belongs to another block - so that the index of "Aman" entry should be removed and a new entry for "Hemant" (pointing to the same ROWID) inserted in the correct index leaf block where 'Hemant' belongs.

  Now, instead of an Index on a single column, think an whole table-ITO is an ordered structure. If you change the value of the key to the order (ie the Index key) then the line should be moved to the correct location that he must belong.

  As it is, it is very bad design to change the values for the PK building. an IOT in such a severely design adds to the problem. Now, instead of simply delete and insert for the column values, the entire row should be deleted and inserted.

  However, if you do not change the values of the PK, then you should not have problems with updates. However, if the size of the line is large (or increases with updates), you will need to handle the overflow.

  Hemant K Collette
  http://hemantoracledba.blogspot.com