SQL & PL/SQL :: Create Non-cluster Index On A Clustered Index?

Jul 11, 2012

Can we create non-cluster index on a clustered index?

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SQL & PL/SQL :: Difference Between Index And Clustered Index

Aug 3, 2010

Any on give explanation for difference between Index and Clustered Index?

It will be great if i get explanation how memory allocation and Execution takes place.?

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PL/SQL :: What Is Non Clustered Index

Sep 25, 2013

What is non-clustered index, How to create non-clustered index.

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SQL & PL/SQL :: What Is Cluster / Bitmap And Functional Index

Dec 26, 2011

index types like cluster,bitmap,binary tree,functional. Specify the differences between these types

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SQL & PL/SQL :: Difference Between Normal And Cluster Index On Table?

Aug 4, 2010

Difference between Normal Index on Table and Cluster Index on Table?

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Text :: Index For Domain Index With Composite Domain Index (CDI) Very Slow

Jun 27, 2012

I 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.

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Performance Tuning :: Local Index Versus Global Index On Partitioned Table

Jun 28, 2011

I 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.

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Server Administration :: Convert Global Index To Local Index

Jun 23, 2011

I 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.

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SQL & PL/SQL :: ORA-01502 - Index Or Partition Of Such Index Is In Unusable State?

Nov 29, 2010

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.

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Performance Tuning :: Index With NVL / Query Is No Longer Using Index

Nov 19, 2010

I have a query which had a join:

a.c1=b.c1 and a.c2=@var

where @var is user supplied input at runtime...We had a index on a.c2 . The CBO would use this index to generate an opitimised query plan.We found some records from table "b" were dropping due to inner join. So we made a change in join. It'd be like

a.c1(+)=b.c1 and nvl(a.c2,@var)=@var

This query is no longer using the index, instead its doing a full table scan causing the query to slowdown.I have tried creating index on nvl(a.c2,'31-dec-9999')

But the CBO won't use it.Anyway to create index on this col so that full table scan can be avoided?

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Performance Tuning :: Force Index If Table Not Using Index?

Aug 9, 2013

How to force an index if the table not using the index?

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When Index Lock Contention Occurs / How To Know Which Index Is Causing

Aug 27, 2012

We have occurrences of enq : TX - index contentions in the database. Using the SQL ID, we have identified the INSERT statement and the table which they are trying to insert.

This table has almost 25 different indexes, some of which are unique as well.I am wondering how to identify the actual index causing issue, out of these 25 indexes.

Is there any way to pin point to the name of index which is causing the lock?My plan is, once the index is identified, I would like to check the extents and inittrans and other attributes of this index to fix.

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PL/SQL :: Create Bitmap Index?

Jan 27, 2013

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

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How To Create Index On Materialized View

Aug 6, 2010

How to create index on materialized view which is refreshed daily basis.

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Create Reverse Key Index On Table

Feb 25, 2013

difference between the ways we create Reverse Key Index on the table.The two ways are as below:

1) CREATE INDEX <Index_Name> ON <Table_Name>(<Column_Name) REVERSE ;
2) CREATE INDEX <Index_Name> ON<Table_Name>(REVERSE(<Column_Name>)) ;

Which one is the appropraite one.
Are both going to act in the same way.

I created index in both ways one by one on the table.But when I fire the select statement against the same table, The explain plan doesn't show any cost and it shows the full table scan in both ways.The select statement used is as below...I want to compare the column with string RBO(i.e('RBO%') at the start.

SELECT *
FROM <Table_Name>
WHERE REVERSE (<Column_Name>) LIKE '%OBR' ;

The select statement is giving me the correct result. Only the explain plan is showing Full Table Scan.can we use this reverse with IN operator also in the same way by reversing the values.

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SQL & PL/SQL :: Create A Table With Constraint And Index

Apr 7, 2010

I use Oracle 10.0.2.0.1.If I create a table with constraint key; after that I create an unique index key, I got an error. Does it mean when I create a table with constraint the unique index are automatically created and I could not create index key as I did as below?

create table test_const(ename varchar2(50) not null,
key_num number not null,
descr varchar2(100),
constraint constraint_test_const unique (ename, key_num));
create unique index test_const_idx on test_const
(
"ENAME","KEY_NUM"
)
tablespace tmp_data;

Error report: SQL Error: ORA-01408: such column list already indexed 01408. 00000 - "such column list already indexed" added [pre] tags by Sriram

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Performance Tuning :: How To Create Index

Mar 30, 2013

I am going through this scenario:

* 35 | ID TABLE ACCESS BY INDEX ROW | S_ORG_EXT | 3064K| 2472M| | 1 (0)| 00:00:01 |
| 36 | INDEX FULL SCAN | S_ORG_EXT_U1 | 14 | | | 1 (0)| 00:00:01 |

Predicate Information (identified by operation id):
---------------------------------------------------
35 - filter("T2"."ACCNT_FLG"<>'N' AND ("T2"."INT_ORG_FLG"<>'Y' OR "T2"."PRTNR_FLG"<>'N'))

This unselective index scan on step 36 of the explain is returning 14 rows but optimizer is selecting 3064 K rows from the table .

I tried creating combined index on all 3 columns mentioned in the predicates for 35th step , but that is not utilized .

how to index this whole expression ::--

(ACCNT_FLG<>'N' AND (INT_ORG_FLG<>'Y' OR PRTNR_FLG<>'N'))

Something like CREATE INDEX XYZ on table((ACCNT_FLG<>'N' AND (INT_ORG_FLG<>'Y' OR PRTNR_FLG<>'N')) compute statistics ;

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SQL & PL/SQL :: Create Primary Key Without Creating Index?

Jul 12, 2012

how to create a primary key with out creating an index?

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SQL & PL/SQL :: Create Index On Multiple Tables?

May 21, 2013

we create index on multiple tables in oracle

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SQL & PL/SQL :: Create Table As Select With Index

Nov 10, 2010

Is it a possible to create table using clause below together with index ?

create table the_table
as
select col1, col2 from table2

I got procedure which create a table in the schema B. The procedure is called from schema A. But when I write into procedure query for create index
then I got a error:

ORA-01031: insufficient privileges when
...executing

Therefore I think about to create table together with index.

begin
B.proc.cre_table;
end;

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SQL & PL/SQL :: To Create A Bitmap Index On Partition Key

Dec 3, 2012

I 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.

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How To Create Unique Index On A View

Aug 24, 2012

11.2.0.1...How do I create an index on a view or any workaround that my view won't get duplicates?

SQL> create unique index indx01 on db_backup_details_vw(id);
create unique index indx01 on db_backup_details_vw(id)
*
ERROR at line 1:
ORA-01702: a view is not appropriate here

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Can Create Unique Index On Subset Of Record

Apr 9, 2013

I have following records in table (T)

Idtype_cdNbrDt
1A1001/1/2013
2A101Null
3B100Null
4C100Null
5A100Null

Based on the type-cd, I need to create Unique index on Nbr & Dt columns

In above record set, I want to create Unique index on type_cd=A and not on B&C (Here i expect duplictes for a combination of Nbr & Dt)

Can we create Unique index on subset of record?

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Any Rule In Documentation When Create Partition Index?

Feb 20, 2012

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?

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SQL & PL/SQL :: How To Create Dynamically ALTER INDEX Command

Nov 15, 2010

how I can create an index dynamically? The DBA wants me to put this code below in the beginning of a PL/SQL package. At first, I tried by just putting the below syntax in the code, but I get an 'Alter' is not a valid identifier.

alter index ZZAP_selected_invoices_n1 rebuild online;

And then once the job completes...

alter index ZZAP_selected_invoices_n1 unusable;

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SQL & PL/SQL :: Unable To Create Index On Large Table

Sep 30, 2012

I am trying to create a new index on large table of size around 100GB. but i am getting the following error:

ORA-1652: unable to extend temp segment by 128 in tablespace TEMP.

temp tablespace size is : 20 GB.

does it mean that the whole index will be created at temp tablspace first?

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Performance Tuning :: Possible To Create Index Which Would Not Look For N Values

Dec 6, 2011

I have column containing three values:-N,E,Y.I want to get results with only E and Y values.Is it it possible to create index which would not look for N values.

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Server Administration :: Create An Index Using Parallelism?

Feb 17, 2011

We are trying to create an index using parallelism. The table contains 24 Million row. But It takes very long time. Also we are unable to see any sessions confirming that the index creation is using parallelism. The creation goes on for more than 3 hours. SQL statement executed :

CREATE INDEX ANT.ANT_OM_TRAN ON APPS.ANT_OM_TRAN_INDX (last_update_date) PARALLEL 4 TABLESPACE APPS_TS_IDX;

I found out the session using the query

select sid,serial#,program,module,osuser,username,machine,inst_id,sql_id
from gv$session where type not in ( 'BACKGROUND') and machine='APCUSDE'
and osuser='applmgr' and program like 'sqlplus%' order by logon_time ;
select * from gv$sqltext where sql_id='akrr2ww1ukq5z';

The given queries were used to check if it was using parallelism, but i was unable to find anything.

SELECT QCSID, SID, INST_ID "Inst", SERVER_GROUP "Group", SERVER_SET "Set",
NAME "Stat Name", VALUE
FROM GV$PX_SESSTAT A, V$STATNAME B
WHERE A.STATISTIC# = B.STATISTIC# AND NAME LIKE 'PHYSICAL READS'
AND VALUE > 0 ORDER BY QCSID, QCINST_ID, SERVER_GROUP, SERVER_SET;
SELECT * FROM V$PX_PROCESS;

how can i make sure that, it is using parallelism.

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Create A Function Based Index On Bold Highlighted

Jul 2, 2010

Using oracle 10g R2 on sun-solaris 10 (sparc-64) Well in the MIS system we have lot of ad-hoc queries coming up. We have proper indexing. Say an example which runs very slow;

SELECT GLKCO, GLDCT, GLDOC, GLDGJ, GLJELN, GLEXTL, GLPOST, GLICU, GLICUT, GLDICJ, GLDSYJ,
GLTICU, GLCO, GLANI, GLAM, GLAID, GLMCU, GLOBJ, GLSUB, GLSBL, GLSBLT, GLLT, GLPN, GLCTRY, GLFY, GLFQ,GLCRCD, GLCRR, GLHCRR, GLHDGJ, GLAA, GLU, GLUM, GLGLC, GLRE, GLEXA, GLEXR, GLUPMJ, GLUPMT, GLBCRC, GLCRRM, GLACR, GLAN8
FROM "PRODDTA"."F0911"
WHERE GLUPMJ <> 0
AND TO_DATE('1 JAN' || (19+substr( GLUPMJ , 1, 1)) || substr( GLUPMJ ,2,2)) + substr( GLUPMJ , 4, 3 ) -1 BETWEEN SYSDATE - 365 AND SYSDATE
[code]....

Here GLUPMJ already indexed so the second query returing an index scan but the first query does a FTS naturally.Now even if I plan to create a function based index on 'the bold highlighted' but how.

create index glupmj_idx on f0911(TO_DATE('1 JAN' || (19+substr( GLUPMJ , 1, 1)) || substr( GLUPMJ ,2,2)) + substr( GLUPMJ , 4, 3 ));..Error If I don't use a FBI my query will result in FTS.

1> how to create a FBI here in this case

2> In MIS systems where 'n' no of ad-hoc queries can come up, how to avoid FTS.

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Performance Tuning :: Create Versus Rebuild Index

Jan 27, 2011

I was comparing cost of rebuild vs create index...I carried out the following test

SQL> create table t4 as select * from t1;

Table created.

SQL> create table t5 as select * from t1 where 1=2;

Table created.

SQL> create index i5 on t5(id);

Index created. SQL> select bytes,extents,blocks from user_segments where segment_name='I5';

BYTES EXTENTS BLOCKS
---------- ---------- ----------
65536 1 8

SQL> alter index i5 unusable;

Index altered.

SQL> alter table t5 nologging;

Table altered.

SQL> Alter session set skip_unusable_indexes=True;

Session altered.

SQL> insert /*+ append */ into t5 select * from t1;

563904 rows created.

SQL> commit;

Commit complete.

Now I compared the cost (elapsed time, logical I/O) of the operations

create index i4 on t4(id);
Vs
alter index i5 rebuild online;

Following is the related trace of above 2 steps

create index i4 on t4(id)

call count cpu elapsed disk query current rows
------- ------ -------- ---------- ---------- ---------- ---------- ----------
Parse 1 0.00 0.00 0 1 0 0
Execute 1 1.17 3.38 9497 7869 335 0
Fetch 0 0.00 0.00 0 0 0 0
------- ------ -------- ---------- ---------- ---------- ---------- ----------
total 2 1.17 3.38 9497 7870 335 0

Misses in library cache during parse: 1
Optimizer goal: CHOOSE
Parsing user id: 5
[code]....

So which option we shall pick in such cases? {Of course I haven't set 'nologging' for the indices but it is same for both indices we are comparing}

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