SQL & PL/SQL :: Are NULLs Indexed In BITMAP Indexes
Jul 24, 2012Are NULLs get indexed in bitmap indexes? How can I verify that.
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Server Administration :: How To Find Non-indexed Queries And Columns That Require Indexes
Sep 1, 2011How to find non-indexed queries and columns that require indexes?
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?
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
SQL & PL/SQL :: IOT Table Can Have More Than One Non-PK Indexed Columns
Jul 27, 2011IOT Table can have more than one non-PK indexed columns.
View 6 Replies View RelatedPL/SQL :: ORA-01408 - Such Column List Already Indexed?
Feb 28, 2013when am trying to add constraint in my table am geting this error ORA-01408: such column list already indexed
View 2 Replies View RelatedPL/SQL :: Is Updating A Non-indexed Column Slower
Oct 7, 2013I have learnt that indexes slow down the DML operations. My question is specific to an update statement. Is it going to be slower if Im trying to update an indexed column on my table or it is slower overall (even when a non-indexed column is getting updated in the table) How does it behave in case of inserts & delete operation.
View 4 Replies View RelatedSQL & PL/SQL :: Query For Non Nulls In A Row
Mar 21, 2010I AM HAVING A TABLE WITH BELOW STRUCTURE AND VALUES.
Table A
Col1Col2 Col3
M1D1V1
M1D2
M1D3V2
M1D4
M1D5
[Code]...
Below is the scenario provided with sample data to replicate the actual requirement.
I am trying to write a query to get below output. But I am not able to succeed.
The column having null values should have the non null value as showed in example.
OUTPUT
------
Col1Col2 Col3
M1D1V1
M1D2v1
M1D3V2
M1D4v2
M1D5v2
M1D6v2
M1D7V3
[Code]...
Below is the script for table and values
create table tmp (col1 varchar2(10),col2 varchar2(10),col3 varchar2(10));
insert into TMP (COL1, COL2, COL3)
values ('M1', 'D1', 'V1');
insert into TMP (COL1, COL2, COL3)
values ('M1', 'D2', null);
[Code]...
Performance Tuning :: Full Tablescan Even Though Join Is On Indexed Field
Oct 18, 2010I am posting the below query:
SELECT PEA.INCURRED_BY_PERSON_ID AS PERSON_ID,
PEA.EXPENDITURE_ENDING_DATE AS WEEK_END_DATE,
CASE
[Code].....
The explain is below:
SELECT STATEMENT ALL_ROWSCost: 48,287 Bytes: 18,428,818 Cardinality: 297,239
3 HASH JOIN Cost: 48,287 Bytes: 18,428,818 Cardinality: 297,239
1 TABLE ACCESS FULL TABLE PA.PA_EXPENDITURES_ALL Cost: 2,964 Bytes: 3,506,094 Cardinality: 194,783
2 TABLE ACCESS FULL TABLE PA.PA_EXPENDITURE_ITEMS_ALL Cost: 43,425 Bytes: 26,637,468 Cardinality: 605,397
Unable To Extract NULLS
Dec 20, 2011Am trying to extract data from oracle onto flatfile(.txt), am using UTL_FILE but, NULLs in oracle tables are getting converted into space and if i try loading into table it is getting loaded as space,
View 1 Replies View RelatedSQL & PL/SQL :: How To Concatenate While Removing Nulls
Jan 26, 2012This is a simple question, but I cannot seem to find a solution. Here's the basic query:
select distinct accountno, parcelno, streetno||' '|| predirection ||' '|| streetname||' '|| streettype||' '|| postdirection||' '|| unitname||', '|| propertycity
from tblacctpropertyaddress ....
What I want to do is add is this logic: If Predirection is null, then no space between streetno & streetname. Same for postdirection and unitname. (for example, if both postdirection and unitname are null, there are no spaces between streettype and the comma before propertycity)
Also, when unitname is not null, I want to add the string "Unit " prior to the returned value in unitname.
PL/SQL :: Running Total For Each Day - Nulls?
Oct 2, 2013I'm on 11.2.0.3. I want to write a query to get calculate a running total of incidents per day - this query will be used for an APEX line chart.Sample table and data:
create table sales (
id number primary key,
time_of_sale date,
item varchar2(20));
insert into sales values (1, to_date('02-JAN-2013','DD-MON-YYYY'), 'book'); ....
SQL & PL/SQL :: How To Remove Nulls In Select Statement
Apr 8, 2010I have a sql like
select TRIM(column_name)
from user_tab_columns
where table_name = 'MTL_SYSTEM_ITEMS_VL' AND COLUMN_NAME IN ('DESCRIPTION ');
[Code]....
Like this i have many rows. What clause other than trim i should apply to no cosider the spaces?
SQL & PL/SQL :: Query To Find Number Of Nulls For Each Record
Aug 18, 2013We have data as below in the table. I need the to display the records in the order based on number of NULL values and position for each record.
provide a simple query using case in ORDER BY clause.
ID CLASS NAME DIST_ID DIST_NAME
0 NULL KIRAN 0 AP
0 C1213 NULL 0 AP
0 NULL NULL 0 AP
NULL C1234 NULL 0 AP
0 NULL NULL 0 AP
NULL NULL NULL NULL NULL
0 C123 RAJESH 0 AP
NULL C123 RAVI NULL AP
We have to give the rank based on NULL values and NULL value column position.Let us assume column positions as
1 2 3 4 5
ID CLASS NAME DIST_ID DIST_NAME
for the following three records number of NULL values are same. but positions are different.
0 NULL NULL 0 AP
NULL C1234 NULL 0 AP
0 NULL NULL 0 AP
NULL C123 RAVI NULL AP
Based on the column positions the ranks as
2*2+3*3=13
1*1+3*3=10
2*2+3*3=13
1*1+4*4=17
Which is having high rank (greatest number) that record should come last . The record which is having all values that should come first. The record which is having all NULL values should come last. The out put I want as
ID CLASS NAME DIST_ID DIST_NAME
0 C123 RAJESH 0 AP
0 NULL KIRAN 0 AP
0 C1213 NULL 0 AP
NULL C1234 NULL 0 AP
0 NULL NULL 0 AP
0 NULL NULL 0 AP
NULL C123 RAVI NULL AP
NULL NULL NULL NULL NULL
SQL & PL/SQL :: Collapse All Nulls For Every Table Column In Statement?
Jul 19, 2013How do I collapse all nulls for every table column in a SQL Statement?
View 15 Replies View RelatedConvert Indexes Of Non-partitioned Table To Hash Partitioned Indexes?
Sep 10, 2012RDBMS - 11.1.0.7, I it possible to convert indexes of a non-partitioned table to hash partitioned indexes by retaining table as non-partitioned?
If yes, is this what it is Creating a Hash-Partitioned Global Index - can be created for partitioned and non-partitioned tables?
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?
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 :: 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
What Does Bitmap Block Represent In Oracle9i
Aug 1, 2007what does a bitmaped block represent in oracle9i.
View 3 Replies View RelatedSQL & 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
View 5 Replies View RelatedSQL & 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.
Bitmap (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.
SQL & PL/SQL :: Default Values / Distinguishing Between Passed And Default Nulls
Nov 16, 2010I was looking for a way to see if a default value for a procedure was passed NULL or it got NULL by default. [URL]
View 11 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