IOT tables ..Analyze

I see that Oracle Index Organized Tables are not getting analyzed by itself. Is this expected? Do i need to analyze this table manually ?
We are using 10.1.0.5
Thanks

Look at the dbms_iot built-in package
http://www.psoug.org/reference/dbms_iot.html

Similar Messages

  • Database table Analyze

    <p>
    {color:#339966}Hi,
    I have a very basic question.
    I want to know what exactly happens in the Database architecture when a table analyze is done by gathering the stats.
    How does this analyze helps in performance of queries.
    Thanks
    Mns{color}
    </p>

    hi,
    Table analyze is done to get the internal details for the table like exact space used,exact blocks used,row chaining etc.
    optimizer uses these details in creating execution plan for the statements for that table.
    SQL> set lines 10000
    SQL> select table_name,num_rows,blocks,chain_cnt,avg_row_len from user_tables where table_name='EMP';
    TABLE_NAME NUM_ROWS BLOCKS CHAIN_CNT AVG_ROW_LEN
    EMP
    SQL> analyze table emp compute statistics;
    Table analyzed.
    SQL> select table_name,num_rows,blocks,chain_cnt,avg_row_len from user_tables where table_name='EMP';
    TABLE_NAME NUM_ROWS BLOCKS CHAIN_CNT AVG_ROW_LEN
    EMP 14 1 0 40
    Regards
    Edited by: NKU on Nov 5, 2008 12:28 AM

  • IOT table in highly concurrent env

    Hi All,
    I have done some bench marking of IOT vs Heap tables and found that updates are lot faster on an IOT table. We will have select, update and inserts on the table we are considering, delete are probably rare - we will drop a partition when we want to delete rows during a maintanence window.
    Does anyone see any issues using IOT table in a highly concurrent DML activity (OLTP) env? If so could you please share any experineces?
    Thanks a lot,
    Vissu

    Hi All,
    I have done some bench marking of IOT vs Heap tables and found that updates are lot faster on an IOT table. We will have select, update and inserts on the table we are considering, delete are probably rare - we will drop a partition when we want to delete rows during a maintanence window.
    Does anyone see any issues using IOT table in a highly concurrent DML activity (OLTP) env? If so could you please share any experineces?
    Thanks a lot,
    Vissu

  • How May i verify, table analyzed or not and if yes, when it was done?

    How May i verify, table analyzed or not and if yes, when it was done?

    SQL> desc user_tables
    Name                                      Null?    Type
    TABLE_NAME                                NOT NULL VARCHAR2(30)
    TABLESPACE_NAME                                    VARCHAR2(30)
    CLUSTER_NAME                                       VARCHAR2(30)
    IOT_NAME                                           VARCHAR2(30)
    PCT_FREE                                           NUMBER
    PCT_USED                                           NUMBER
    INI_TRANS                                          NUMBER
    MAX_TRANS                                          NUMBER
    INITIAL_EXTENT                                     NUMBER
    NEXT_EXTENT                                        NUMBER
    MIN_EXTENTS                                        NUMBER
    MAX_EXTENTS                                        NUMBER
    PCT_INCREASE                                       NUMBER
    FREELISTS                                          NUMBER
    FREELIST_GROUPS                                    NUMBER
    LOGGING                                            VARCHAR2(3)
    BACKED_UP                                          VARCHAR2(1)
    NUM_ROWS                                           NUMBER
    BLOCKS                                             NUMBER
    EMPTY_BLOCKS                                       NUMBER
    AVG_SPACE                                          NUMBER
    CHAIN_CNT                                          NUMBER
    AVG_ROW_LEN                                        NUMBER
    AVG_SPACE_FREELIST_BLOCKS                          NUMBER
    NUM_FREELIST_BLOCKS                                NUMBER
    DEGREE                                             VARCHAR2(10)
    INSTANCES                                          VARCHAR2(10)
    CACHE                                              VARCHAR2(5)
    TABLE_LOCK                                         VARCHAR2(8)
    SAMPLE_SIZE                                        NUMBER
    LAST_ANALYZED DATE
    PARTITIONED                                        VARCHAR2(3)
    IOT_TYPE                                           VARCHAR2(12)
    TEMPORARY                                          VARCHAR2(1)
    SECONDARY                                          VARCHAR2(1)
    NESTED                                             VARCHAR2(3)
    BUFFER_POOL                                        VARCHAR2(7)
    ROW_MOVEMENT                                       VARCHAR2(8)
    GLOBAL_STATS                                       VARCHAR2(3)
    USER_STATS                                         VARCHAR2(3)
    DURATION                                           VARCHAR2(15)
    SKIP_CORRUPT                                       VARCHAR2(8)
    MONITORING                                         VARCHAR2(3)
    CLUSTER_OWNER                                      VARCHAR2(30)
    DEPENDENCIES                                       VARCHAR2(8)
    COMPRESSION                                        VARCHAR2(8)
    SQL>

  • Iot table column modify

    Oracle Database 10g Release 10.2.0.1.0 - Production
    PL/SQL Release 10.2.0.1.0 - Production
    CORE     10.2.0.1.0     Production
    TNS for 32-bit Windows: Version 10.2.0.1.0 - Production
    NLSRTL Version 10.2.0.1.0 - Production
    we have iot table which has 7.7 million record ,in production environment and i need to modify one column of this table say "T"
    i planned to
    create new table "copy_T" with create table as select and
    truncate "T" and
    modify "T"
    i inserted again all records from copy_T to T with
    insert into T select * from copyT
    what is the best approach for this case
    Message was edited by:
    JAA
    Message was edited by:
    JAA

    Create a temporary table with parallel execution and Truncate the old table ( better rename the table) and
    Rename the temporary table to the required table name

  • When is table analyzed after mapping

    The OWB 10.1 User Guide says this about the mapping configuration parameter Analyze Table Statements:
    "If you set this parameter to true, Warehouse Builder generates code for analyzing the target table after the target is loaded if the resulting target table only is double or half its original size."
    But if I look in the generated package, DBMS_STATS is performed when the number of records loaded is greater than NUM_ROWS in ALL_TABLES (so greater than when the table was analyzed last).
    I'm I missing something or is this a document error?
    Jaap.

    No, you are correct!
    Thats a BIG mistake from the OWB developers if you ask me. They know about it since several people opened a TAR regarding this issue.
    MB

  • Table analyzed / indexes rebuilt

    In data warehouse, we have a contract summarization table. The daily data feed populates this table. It didn't analyzed since 4/25/2007. But its indexes are rebuilt every day when processing data. The questions are:
    1. since these indexes are built daily, should we worry about the table performance because the table itself is not analyzed for 3 months?
    2. we have a script running each weekend to analyze tables in this database. For some reason, this table didn't get analyzed for 3 months. This table is a very active table and data is changed daily. Any other reasons?
    I really appreciate the help if someone can shed some lights.
    Jin

    1. Why are the indexes rebuilt every day? Are they bitmap indexes that are dropped and re-created before/after loads? There is much discussion on the topic of rebuilding indexes many arguing that it is not a necessary excercise, search asktom.oracle.com. If the stats do not reflect what data is in the table then you should gather statistics.
    2. Don't know what version you are using and whether you really are using the analyze command but use DBMS_STATS instead.

  • TEMP table & IOT table

    Hi all,
    I have the following observation related to TEMP table. I am wondering if it is always correct.
    When you query dba_tables the tablespace_name is empty if it is a temporary table. Also it has 0 records.
    Also I just found one index organized table in our db (first time see this creature) based on iot_type = ‘IOT’. It also has tablespace_name column empty and 0 records in table. Based on the knowledge I got from reading the index organized table should just like regular table except that its data is sorted when saved in the database. So if it is being used it should have non zero records in the table, right?
    Thanks a lot for your info.
    Shirley

    Hi..
    21:37:05 ravan >conn anand/xxxxxx
    Connected.
    21:37:46 ravan >21:38:01 ravan >CREATE TABLE t1 (c1 NUMBER PRIMARY KEY, c2 VARCHAR2(30)) ORGANIZATION INDEX tablespace users;
    Table created.
    Elapsed: 00:00:00.01
    21:38:51 ravan >select OWNER,TABLE_NAME,TABLESPACE_NAME,IOT_NAME,IOT_TYPE from dba_tables where table_name='T1';
    OWNER                          TABLE_NAME                     TABLESPACE_NAME                IOT_NAME                       IOT_TYPE
    ANAND                          T1                                                                                   IOT
    21:49:02 ravan >insert into t1 values (1,'a');
    1 row created.
    Elapsed: 00:00:00.00
    21:49:21 ravan >insert into t1 values (2,'b');
    1 row created.
    Elapsed: 00:00:00.00
    21:49:25 ravan >insert into t1 values (3,'c');
    1 row created.
    Elapsed: 00:00:00.00
    21:49:29 ravan >insert into t1 values (4,'d');
    1 row created.
    Elapsed: 00:00:00.00
    21:49:33 ravan >
    21:49:34 ravan >commit;
    Commit complete.
    Elapsed: 00:00:00.00
    21:49:36 ravan >
    21:49:36 ravan >
    21:49:36 ravan >
    21:49:37 ravan >select * from t1;
            C1 C2
             1 a
             2 b
             3 c
             4 d
    Elapsed: 00:00:00.00
    21:50:40 ravan >conn sys/xxxxxx as sysdba
    Connected.
    21:51:20 ravan >exec dbms_stats.gather_table_stats(ownname =>'ANAND',tabname =>'T1',cascade =>true);
    PL/SQL procedure successfully completed.
    21:55:34 ravan >select table_name,owner,tablespace_name,num_rows,last_analyzed,avg_row_len,blocks FROM dba_tables WHERE  table_name  like UPPER('%&table_name%');
    Enter value for table_name: t1
    TABLE_NAME                     OWNER                          TABLESPACE_NAME        NUM_ROWS LAST_ANAL AVG_ROW_LEN     BLOCKS
    T1                             ANAND                                                        4 05-MAR-09           5
    21:56:50 ravan >select table_owner,table_name,owner AS index_owner,index_name,tablespace_name,num_rows,status,index_type FROM dba_indexes WHERE  table_owner = UPPER('&owner') AND table_name = UPPER('&table_name') ORDER BY table_owner, table_name, index_owner, index_name;
    Enter value for owner: anand
    Enter value for table_name: t1
    TABLE_OWNER          TABLE_NAME                     INDEX_OWNER          INDEX_NAME                  TABLESPACE_NAME        NUM_ROWS STATUS      INDEX_TYPE
    ANAND                T1                             ANAND                SYS_IOT_TOP_28811           USERS                            4 VALID    IOT - TOP
    Elapsed: 00:00:00.00HTH
    Anand

  • Table Analyze Automatically

    Hi,
    My database in 10g Linux envirnoment, I have found that some of the tables in database are analyze autometically.
    Is it possible in 10g that oracle will analyze the tables autometically at perticular time.
    Please help.
    Anand

    By default, 10g ships with a DBMS_SCHEDULER job that automatically gathers statistics when Oracle considers the statistics stale. If you did not disable this job, it would be expected that Oracle would gather statistics automatically during the nightly maintenance window.
    Justin

  • HOW TO TELL IF TABLE ANALYZED

    Hi:
    I need to figure out if a table has been analyzed, does anyone know how to do it.
    If a table has been analyzed, will the CBO always be used, can I not use hints then?
    Thanks,
    Thomas

    In 7.3.4 the data dictionary does not record the last analysis date for tables and/or indexes.
    You can tell which tables were analyzed by this query:
    select owner, table_name from dba_tables
    where num_rows is not null ;for indexes the query would be
    select owner, index_name from dba_indexes
    where leaf_blocks is not null ;But you cannot tell when they were analyzed.

  • Rowid in IOT table

    It seems that rowid in IOT is
    created by function involving primary key.
    is there any built in function or package
    that we use to simulate that ?
    null

    Think about what a ROWID actually is and it will become clear.
    "The rowid of a row specifies the datafile and data block containing the row and the location of the row in that block."

  • Partitioned tables and IOT

    Hi All,
    We had a database using IOT but now because of the performance reasons
    we want to elimnate IOT table and using the Parititioned Tables.
    Have you ever using the partitioned tables for ORACLE with your database?
    If you have done that please share your experiences or refer me some
    documents related to Partitioned tables for ORACLE to make my job more
    easier.
    Thanks in advance,
    JP

    Hi,
    You will get good information from this Oracle site,
    http://www.oracle.com/technology/documentation/index.html.
    Thanks

  • DataPump imp: Re-organization a Heap table to IOT compressed table

    Hello,
    I'd like to re-organize a heap table to IOT TABLE the heap table has a size of 25GB.
    After do the expdp table I drop the heap table and create the table as IOT using the compress 2 option. Because this table has a 9 PK columns the compress prefix optimal is 2.
    After, I run the impdp with the option accesss_method=direct_path (to avoid UNDO generation). The IOT index is not compressed. I doing a alter table TAB_IOT move compress, the compress work becasuse the segment reduction.
    The question is exists any way to force the compression at import phase to reduce steps and storage resources.
    My env is Oracle 11.1.0.7 on LInux-x64.
    Many thanks
    Arturo

    DBMS_REDEFINITION
    http://www.morganslibrary.org/reference/pkgs/dbms_redefinition.html
    It is not going to happen in any respect with DataPump.

  • What happens when an analyze table is terminated/killed?

    Just curious if a rollback occurs to the old statistics, are they corrupted, removed completely, or other?
    Thanks

    I think the operation will get reversed (rollback) if a table analyze was interrupted and the status of previous statistics may become stale.
    Why don't you try it and let us know what happens? If you can't let me know, I will try it tomorrow and let you know :)

  • Analyze table taking lot of time

    HI,
    I am analyzing fact table. its taking almost 1 hour to. is there any solution for the same?
    i am using compute statistics.
    regards,
    sandeep

    Hi,
    Why not DBMS_STATS which collects stats in parallel so much faster then analyze command.I strongly recommand use DBMS_STATS in case of partition tables.Much faster, collects local and global stats both.
    Analyze cmd for partitioned table:--
    analyze table <schema>.<table> partition (<partition_name>) estimate statistics sample 5 percent;
    Use GATHER_SCHEMA_STATS for whole schema analysis .

Maybe you are looking for