SQL & PL/SQL :: What Is Cluster / Bitmap And Functional Index
Dec 26, 2011index types like cluster,bitmap,binary tree,functional. Specify the differences between these types
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SQL & PL/SQL :: Functional Index
May 19, 2011How can i turn this into functional index.
WHERE (IPC_DISP_ID IS NOT NULL AND DISP_EXIST > 0)
AND (IPC_UPU_BCD IS NOT NULL AND RECPT_EXIST > 0)
AND ( (IPC_ITM_ID IS NOT NULL AND ITM_EXIST > 0) OR IPC_ITM_ID IS NULL )
Bitmap Index Not Getting Used
Oct 20, 2012I am using ORACLE 11gR1.
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?
select * from test where col2 = 'Y';
SQL & PL/SQL :: ORA-30556 - Functional Index Is Defined On Column To Be Modified
Feb 2, 2012I'm altering a column length to increase the size and getting "ORA-30556: functional index is defined on the column to be modified".
On searching more about this error, it seems like the function index must be dropped before altering the column.The table I'm dealing with is huge.
Question 1:In case of dropping and recreating the index, should the following steps be done:
- Drop Index
- Alter the column to increase the size
- Recreate the index with NOLOGGING and NOPARALLEL clause
- ALTER INDEX to turn on LOGGING
- Gather Statistics on that index
Question 2:Is there anything else that should be done when the index is dropped and re-created?
Question 3:What are the side-effects of carrying out the above steps in a huge table with around 15 million rows?
Question 4:Would it work if I disable the index, alter the column and reenable the index?Do I have to rebuild the index and gather Stats upon reenabling it?
SQL & PL/SQL :: Bitmap Or B-Tree Index?
Apr 9, 2010I 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?
PL/SQL :: Create Bitmap Index?
Jan 27, 2013i 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
SQL & PL/SQL :: Functional Index - Catch Exception And Print Customized Message
Feb 16, 2011I have a functional index.. which doesn't allow duplicate based on condition.I want to catch the exception and print the customized message but it always override my message.
create or replace function i_func
(tt_id in number,
d_date date,
stat in varchar2)
return varchar2
[code].....
output: ORA-00001: unique constraint (abb.TEST_IDX) violated
SQL & PL/SQL :: To Create A Bitmap Index On Partition Key
Dec 3, 2012I have an IOT table with partitioned on list. I have p1,p2 and p3 partitions. Now I would like to create a bitmap index on partition key.
I gave ALTER TABLE .. MOVE MAPPING TABLE;
But getting the below error,
ORA-28660: Partitioned Index-Organized table may not be Moved as a whole.
SQL & PL/SQL :: Bitmap Index Rebuild - Getting ORA-00054
Nov 15, 2012oracle 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.
ORA-00439 Feature Not Enabled - Bitmap Index
Jul 11, 2012I am using Oracle 10g XE (express edition). If I try to create a bitmap index, I get an error
ORA-00439 feature not enabled: Bit mapped Indexes
How do I solve this problem and create a bitmap index?
Select Statement Gives Different Results Using Bitmap Or Normal Index
Jan 10, 2012we have a strange symptom in a database Oracle 11.2.0.2 EE. Following question comes from our application developers.
The following SQL statement:
SELECT
v.reporting_month,
sum(v.f_s) "REV_S",
sum(v.f_f) "REV_F",
sum(v.f_c) "REV_C",
[code].......
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.
SQL & PL/SQL :: Create Non-cluster Index On A Clustered Index?
Jul 11, 2012Can we create non-cluster index on a clustered index?
View 5 Replies View RelatedSQL & PL/SQL :: Difference Between Normal And Cluster Index On Table?
Aug 4, 2010Difference between Normal Index on Table and Cluster Index on Table?
View -1 Replies View RelatedPL/SQL :: Bitmap Index On Number Column X Char Column?
Jul 23, 2013is 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:
select ass.column20, ass.column30from table_a pucinner join table_b asson ass.column1 = puc.column1where pc.column_char = 'S'and ass.column_char02 = 'P'
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
Create Dimension - Functional Dependency Between Levels
Sep 28, 2010the literature equates dimension hierarchies with fuctional dependencies between the levels. I like to tst the strength of this assumption with the implementation of 'CREATE DIMENSION' which allows you to create roll-up hierarchies.
My question to put it simply is this: Given:
CREATE DIMENSION location_dim
LEVEL location IS (location.loc_id)
LEVEL city IS (location.city)
LEVEL state IS (location.state)
HIERARCHY geog_rollup (
location CHILD OF
city CHILD OF
state CHILD
)
Can I insert the following rows into the dimension:
loc_id, city, state
1, Epping, NSW
2, Epping, VIC
Please note that the two Eppings are different cities.
Given the roll-up hierarchy City -> State, will it require that for every city there can be only one state in which case the FD between City and State cannot hold. Or, is it that the roll-up hierarchy defined here has nothing to do with FD.
The second part of the question is if the answer to the above question is that the roll-up is not the same as FD, then is the ATTRIBUTE clause meant to define the n:1 (functional dependency) instead?
SQL & PL/SQL :: Functional Difference Between Type %rowtype And Record
May 17, 2010What is functional diffrence between type, %rowtype and record.
View 3 Replies View RelatedDevelop Functional Document For Existing Package
Feb 21, 2013I would like to develop a functional document for existing package. How to prepare the document if posted the whole code here?
View 1 Replies View RelatedFunctional Design Document For Existing Package
Feb 25, 2013I would like to design a functional design document for existing package. Let me know is there any tool which will build the design document?
View 8 Replies View RelatedEnterprise Manager :: OEM 12c - Compare Period ADDM Non-functional
Apr 17, 2013In my production environment, I have a mostly working Oracle 12c Cloud Control environment, managing several database instances. On all of the databases, I am unable to use the Compare period ADDM feature ( Instance > Performance > AWR > Compare Period ADDM).
When I select that menu option, I see the message "To be able to use this feature some PL/SQL packages need to be loaded into the target database's monitoring schema, DBSNMP." I have been searching for further information in the specific packages that need to be loaded per the message, but neither Orafaq, [URL] nor Google seem to have those details.
BITMAP AND Is Not Being Used
Jul 1, 2011I have 2 sets of phone number ranges and need to find the ranges that intersect.
create table rng1
(
rng_start varchar2(10),
rng_end varchar2(10)
);
[code]....
When I try to find the ranges matching (intersecting) a certain range (e.g. '21112'-'2111299999'), optimizer does a FULL TABLE SCAN, which is not opimal in my opinion. I use the hint to force the optimizer use the indexes.
select /*+ index_combine(rng2 x_rng2_start, x_rng2_end) */ *
from rng2
where
rng2.rng_start <= '2111999999'
and rng2.rng_end >= '2111';
Plan
SELECT STATEMENT ALL_ROWSCost: 60 Bytes: 17,344 Cardinality: 1,084
7 TABLE ACCESS BY INDEX ROWID TABLE LUMAMIPA.RNG2 Cost: 60 Bytes: 17,344 Cardinality: 1,084
6 BITMAP CONVERSION TO ROWIDS
5 BITMAP AND
2 BITMAP MERGE
1 BITMAP INDEX RANGE SCAN INDEX (BITMAP) LUMAMIPA.X_RNG2_START
4 BITMAP MERGE
3 BITMAP INDEX RANGE SCAN INDEX (BITMAP) LUMAMIPA.X_RNG2_END
However, when I try to join the 2 sets of ranges by matching the intersecting ranges, then the range scan and "BITMAP AND" of the 2 indexes is not done, even though the hint is specified:
select /*+ index_combine(rng2 x_rng2_start, x_rng2_end) */
count(*) cnt
from rng1
join rng2 on
rng1.rng_start <= rng2.rng_end
and rng1.rng_end >= rng2.rng_start;
[code]...
How to make the optimizer use the range scan of both indexes? Is there a better way to match the ranges?
Performance Tuning :: Create Small Functional Indexes For Special Cases In Very Large Tables
Apr 5, 2012Create small functional indexes for special cases in very large tables.
When there is a column having one values in 99% records and another values that have to be search for, it is possible to create an index using null value. Index will be small and the rebuild fast.
Example
create index vh_tst_decode_ind_if1 on vh_tst_decode_ind
(decode(S,'I','I',null),style)
It is possible to do index more selective when the key is updated and there are many records to create more levels in b-tree.
create index vh_tst_decode_ind_if3 on vh_tst_decode_ind
(decode(S,'I','I',null),
decode(S,'I',style,null)
)
To access the record can by like:
SQL> select --+ index(vh_tst_decode_ind_if3)
2 style ,count(*)
3 from vh_tst_decode_ind
4 where
5 decode(S,'I','I',null)='I'
6 group by style
7 ;
[code]....
What Does Bitmap Block Represent In Oracle9i
Aug 1, 2007what does a bitmaped block represent in oracle9i.
View 3 Replies View RelatedSQL & PL/SQL :: Which Constraint For Bitmap Join Indexes
Jul 18, 2013I have a few dimension tables with surrogate keys and a fact table with foreign keys on columns referring to the dimension table. I want to create primary keys on the dimension tables and foreign keys on the fact table, but with minimal overhead of constraint validation when loading the data.
Other than bitmap indexes on the FK columns on the fact table, I also want to create a bitmap join index on the fact table joined to the dimension table on a handful of dimension columns.
Which is the best suited constraint definition? Only RELY, or RELY + DISABLE, or RELY + DISABLE + NOVALIDATE, or RELY + NOVALIDATE, or any other?
SQL & PL/SQL :: Are NULLs Indexed In BITMAP Indexes
Jul 24, 2012Are NULLs get indexed in bitmap indexes? How can I verify that.
View 3 Replies View RelatedBitmap (PDF / XML) Printing In Duplex Mode From Oracle Apps
Mar 16, 2011I am running oracle Apps 11.5.10.2, trying to enable duplex printing for all PDF / XML reports.
View 1 Replies View RelatedReports & Discoverer :: Bitmap Is Not Exporting To Excel File
Jan 24, 2012I have added a bitmap image in my workbook but when i am exporting it into excel or HTML ,only text part of the title is exporting into excel file . The bitmap is only visible in discoverer workbook ,after exporting to excel or HTML, it disappears,
i am using oracle 9i discoverer version 9.0.2.0.
Performance Tuning :: Only LOCAL Bitmap Indexes Are Permitted On Partitioned Tables
Feb 4, 200516:28:32 SQL> create bitmap index bp_idx_ag_id on transactions(type);
create bitmap index bp_idx_ag_id on transactions(type)
*
ERROR at line 1:ORA-25122: Only LOCAL bitmap indexes are permitted on partitioned tables
how to create bitmap index on partitiioned tables
Text :: Index For Domain Index With Composite Domain Index (CDI) Very Slow
Jun 27, 2012I am on 11.2.0.3 Enterprise Edition. We are using the new feature "Composite Domain Index" for a Domain index on a very large table (>250.000.000 rows). It really works with mixed queries. We added two number columns using FILTER BY.We have lots of DML on this table. Therefore, we are executing synchronize and optimize once the week. The synch behaves pretty normal. But "optimize_index" takes a very very long time to complete. I have switsched on 'logging' for the optimize process. The $I table takes some time but is finished normally. But the optimization of the $S table (that is the table created for the CDI feature) is running over 12 hours now - and far from being finished. From the logfile, I can see that it optimizes 1000 rows every 20 minutes. Here is the output of the logfile:
Oracle Text, 11.2.0.3.0
14:33:05 06/26/12 begin logging
14:33:05 06/26/12 event
14:33:05 06/26/12 process $N for optimize: SEQDEV.GEN_GES_DESCRIPTION_CTX_I
14:33:16 06/26/12
14:33:16 06/26/12
[code]....
I haven't found a recommendation from Oracle not to use "optimize_index" for Domain Indexes with CDI. But in my case, it would be much faster just to drop and recreate the Domain Index in question.
Performance Tuning :: Local Index Versus Global Index On Partitioned Table
Jun 28, 2011I have a huge table (about 60 gb) partition over range. The index on this table is global index created on 4 columns together. I have a query which is running very slowly. The explain plan is showing the use of this global index.Explain plan is not showing pstart and pend because the index is global.
View 6 Replies View RelatedServer Administration :: Convert Global Index To Local Index
Jun 23, 2011I have a global index and I want to convert it to local index.Is there a way to recreate local index with out dropping the global index.
I can create a local index first and then drop the global index. But is there a way to create it with out dropping the global index, just convert it.