i want to create a bitmap index,but getting the error shown below..i created primary key on column dname of dept and unique constraint on empno of emp.
SQL> create bitmap index bindx on dept d(d.dname) from emp e,dept d where e.deptno=d.deptno; create bitmap index bindx on dept d(d.dname) from emp e,dept d where e.deptno=d.deptno * ERROR at line 1: ORA-25954: missing primary key or unique constraint on dimension
Is there any rule in documentation, when create partition index? For tables, it is said to partition when table is greater than 2GB, but what about index? WHat size it should have to partition?
I was running a test on a huge table with a bitmap index on one of the columns. But bitmap index is not getting used. Below are the test details.
create table test (col1 number, col2 number);
begin for i in 1..1000000 loop if mod(i,2) = 0 then insert into test values(i, 'Y'); else insert into test values(i, 'N'); end if; end loop; end; COMMIT;
The intention here is to have only two distinct values in the entire table. Based on these values I will not build BITMAP index on col2.
CREATE BITMAP INDEX BITMAP_TEST on TEST(col2) COMPUTE STATISTICS;
Now when I run the below query, it doesn't uses BITMAP index. Instead the explain plan shows a full table scan.
select * from test where col2 = 'Y';
Now when I force ORACLE to use index through hint, the cost is too high while using the bitmap index(probably why the ORACLE chose not to use the index at the first stage).
I have read somewhere, that BITMAP index is useful when we have more than 1 or 2 bitmap indexes on other columns of the same table as well And the query should be like
select * from table where col1 = 'Y' and sex = 'F';
In this case oracle will use BITMAP but not in the case where there is only one column that has BITMAP index.
Considering all the factors stated above, is there any way I can fine tune my original query?
I was executing following query and it was taking about 20 sec's to execute before i decided to create B-Tree(Normal) index on column DeliVery.
Select DeliVery,Code,Sum(Units),Sum(Loads),Count(units), Count(Loads) Where
[code]...
After creating B-Tree index on Column Delivery the execution time has been reduced to one second ,thats what i wanted. But If i create Bitmap index on the same column then execution time is not getting reduced and is still same around 20 sec.I think theoratically "Delivery" column is the right candidate for Bitmap index? whether should i create bitmap index or stick with B-Tree index?
oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - 64bit Production PL/SQL Release 11.1.0.6.0 - Production "CORE 11.1.0.6.0 Production"
I have a procedure that is run weekly to load the data, for which it calls another procedure. This weekly procedure, disables the index, load the data, and rebuilds the index. During rebuilding of index, its giving ORA-00054: resource busy and acquire with NOWAIT error. I dont have privileges to look for session id, and kill the session. How to avoid this error.
create or replace PROCEDURE "WCL_WEEKLY_UPLOAD" ( p_event_id IN NUMBER ) [code]....
As you can see, after the procedure wc_upload, COMMIT is issued, and then the rebuilding of the index is starting. So dont know what is causing the table to lock.
gives different result when we exchange the index ksr_valid_until_i on table kreditkarten_sets_rs. For some reasons we changed the index from bitmap to normal and are getting different results. Switching back gives us the same results as before. When we avoid the usage of this index in the statement than we are getting the same results as when we are using the normal index.
I am facing the error "ORA-01502: index or partition of such index is in unusable state " while loading the text data using sql loader with direct path (direct = Y ,rows = 10000) option. Table consists an composite non unique index. If I query the dba indexes for the effected index it shows the index status as VALID. There was no maintaince done on the effected table or index. I have tried loading the same data using conventional path but didn't found any issues for the same.
I Know we can create dynamic partitions on table in oracle 11g. Is it possible to create normal partition and sub partition both dynamically.I have to create Normal partition range on date and sub partition list on Batch ID (varchar).
is there some performance/access difference between a bitmap index on a number column and char(1) column? Both columns are not null with a default value.My application has a querie like this:
If I create a bitmap index on column "column_char", the access plan is not changed. But changing the column datatype to number(1) and obviously the values, the index is accessed and the cost decreases.This table has 4.000.000 rows. Oracle 11.2.0.2SO
how to partition and index my table for a special problem.
The table:
CREATE TABLE TEST ( ID NUMBER PRIMARY KEY, U_VALUE NUMBER NOT NULL, -- Ranges from 0 - 30.000.000 O_VALUE NUMBER NOT NULL, -- Ranges from U_VALUE - 30.000.000 CREATE_TS TIMESTAMP DEFAULT SYSTIMESTAMP NOT NULL, UPDATE_TS TIMESTAMP NOT NULL, ITEM_TYPE NUMBER NOT NULL --<< Only 4 different values >> );
As you can see, U_VALUE is ALWAYS lower than O_VALUE.I need to have the CREATE_TS in either main- or subpartition do drop the partitions after some time so i don,t have to use DELETE statements. The table has 360 millions rows.
The application has only 8 query which will always use a WHERE clause like this:
SELECT * FROM TEST WHERE U_VALUE <= :1 AND O_VALUE => :2 AND ITEM_TYPE = :3
1. Is there any good technique how to create a good index for the queries (application will execute 120 queries per second)?
Index with following PARTITIONS. Index rebuild is extremely slow. Below 2 Alter index ..rebuild... took 10 hours to complete. Because of this queries which based on this index are really slow.
SYS@DB AS SYSDBA> select partition_name,tablespace_name,bytes/1024 KB from dba_segments where segment_name='KSTN'; PARTITION_NAME TABLESPACE_NAME KB ------------------------------ ------------------------------ ---------- REB_IDX_1 TS_REB 64 REB_IDX_2 TS_REB 64 REB_IDX_3 INDEX 64 REB_IDX_4 TS_REB 64
after merging two partitions into single partition (partition is by list) of a table ,when i analyzed the table it is giving this error : ORA-01502 INDEX TEST.PK_ID or partition of such index is in unusable state.
ALTER TABLE SNYT.PART_ESTD SPLIT PARTITION ESTD_M13_S22 AT ('ESTD', 13, '22') INTO (PARTITION ESTD_M13_S21, PARTITION ESTD_M13_S22) update indexes;
(per http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:1401247200346349807) ================================================================= If Global index used
ALTER TABLE SNYT.PART_ESTD SPLIT PARTITION ESTD_M13_S22 AT ('ESTD', 13, '22') INTO (PARTITION ESTD_M13_S21, PARTITION ESTD_M13_S22) UPDATE GLOBAL INDEXES;
We have a large customer table so first thought was to partition.Also we see two union alls in the plan - can we introduce parallelism? Below is the plan - have attached a text file if difficult to read
I am rebuilding some UNUSABLE local index partitions on Oracle 8.1.7.4.0 (64bit) database . The platform is a HPUX machine.
The DDL of the partition table/indexes: ========================= CREATE TABLE TESTME ( INST_NO CHAR(3) NOT NULL, ACCT_NO CHAR(16) NOT NULL, REC_NO CHAR(9) NOT NULL, TRAN_TYPE CHAR(2) DEFAULT ' ', STAT CHAR(2) DEFAULT ' ', [code]...
Can i alter the table to create partition on non partition table, i have tried and could not create it. Do we have some other means to do it as this is the live table and cannot drop them else will lose the data.
I plan to create a copy of original partition table as below in source database DB1.
create table tblname as select * from sourcetab;
The purpose i am creating copy of original tables is i want to have same partition tables with data in target database DB2 (where the partition feature is diabled).
So i am creating copy of original partition tables ,will then create dump of duplicate tables using export method and then load the dump into target database using import.
Both source and target database are in different servers. Partition is disabled in target database. Partition table size is 2GB and it has 5 partitions P1,P2,P3,P4,P5 .Each partition is of size 100 MB. Count of partition table is 15805412
1.My question is would there be any problem while loading dump into target database (where the partition feature is not enabled)? 2.Is it feasible to create a copy of partition tables using below statements in same database ?