SQL & PL/SQL :: Replace The Like Operator To Increase The Performance
Jul 16, 2012How to replace the like operator for increase the performance. Because it is taking more time and not using the index.
SELECT *
FROM emp
WHERE ename like '%AL';
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Increase In Performance Through Re-Indexing
Feb 28, 2011I'm Using Oracle DB, I have got performance issue in one of my portlet, Can Re-Indexing work for Increasing the performance.
View 3 Replies View RelatedHow To Increase DML Statement Performance
Jun 27, 2012How do we increase the DML statement Performance?
View 8 Replies View RelatedPerformance Tuning :: One Job Is Hanging After SGA Increase?
Mar 11, 2013Additional Information
Step 1: Increased Physical Memory on one Node from 32 G to 48 G.
Step 1 Impact : DB was running same as before
Step 2 : Increased SGA from 12 G to 15 G.
Step2 Impact : DB was running same as before for 1 day next day one reporting job was hanging.
Step 3 : Increased DB_CACHE_SIZE from 5G to 7G.
Step 3 Impact : Over all CPU Utilization was high and no effect on reporting job.
Step 4 : Decreased DB_CACHE_SIZE from 7 G to 5 G.
Step 4 Impact : CPU Utilization came down little bit but no effect on reporting job.
Now our main concern is why CPU Utilization is going high. Because same thing we did last time and we got positive results.
Networking And Gateways :: How To Increase Oracle SQL*Net Performance
Nov 25, 2011One of my MOD_PLSQL based Oracle APEX Application is running on the web. I have almost 1000 web users to access the Application where at least 250-300 users are always on line. In Oracle EM web interface When run ADDM I see suggestions "Investigate the cause of SQL*Net more data to client" or something like this. and I am getting complains about poor server response. Here are my configuration of the system:
Database Server Host: DBServer (Oracle Database 10.2.0.3)
HTTP Server Host: OraHTTP (Oracle Companion CD 10g)
DADS.conf HTTP Server configuration
MOD_PLSQL database access for web clients.
How can I increase database connection performance?
Performance Tuning :: Restart Database After Increase Db_cache_size?
Aug 23, 2012SQL> show parameter sga
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
lock_sga boolean FALSE
pre_page_sga boolean FALSE
sga_max_size big integer 1152M
sga_target big integer 0
[code]....
in scenario above, the database do not using ASMM, and spfile If I wan to increase db_cache_size parameter, do i need to rebounce instance?
Performance Tuning :: Increase Few Of Columns Size In The Table
Feb 14, 2013We have a table emp_details with 23772889 records. Our requirement is to increase few of the columns size in the table emp_details. We are following the below alter statement which is taking around 2 hours of time.
ALTER TABLE emp_details
MODIFY
(
address char(90)
,department char(30)
)
/
Is there any way to improve the above query performance?
Enterprise Manager :: Increase Performance Of Form And Report Server?
Aug 27, 2009We are just but new oracle 10g(10.1.2.0.2) Database and application server ( form and report server ).have installed application server on window server 2003.
it will running ,but it is used lots of memory.so the performance decrease when user increase.
Performance Tuning :: How To Increase Data Retrieval / Insertion Speed
Oct 24, 2013How To Increase Data Retrieval / Insertion Speed my data base has more than 0.5 million records Forms Some Time Respond Very Slow .
View 8 Replies View RelatedPerformance Tuning :: ORA-01555 - Increase Undo Size Or Retention?
Apr 22, 2013I have got the following error yesterday
ORA-01555 caused by SQL statement below (SQL ID: fdxcyoin67ty8t, Query Duration=380128 sec, SCN: 0x0229.ff00afd0):
following are the existing settings
SQL> show parameter undo
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
undo_management string AUTO
undo_retention integer 96000
undo_tablespace string undo
[code]....
following are the details from v$undostat
select begin_time, end_time, undotsn, undoblks, maxquerylen, maxqueryid, activeblks, unexpiredblks, expiredblks, tuned_undoretention from v$undostat
where trunc(begin_time)=trunc(sysdate)-1 order by begin_time;
BEGIN_TIME END_TIME UNDOTSN UNDOBLKS MAXQUERYLEN MAXQUERYID ACTIVEBLKS UNEXPIREDBLKS EXPIREDBLKS TUNED_UNDORETENTION
-------------- -------------- ---------- ---------- ----------- ------------- ---------- ------------- ----------- -------------------
21-04-13 00:08 21-04-13 00:18 1 12733 378446 duqnawh32hp4u 91152 7068448 225440 345600
21-04-13 00:18 21-04-13 00:28 1 8951 379047 duqnawh32hp4u 99344 7072800 225440 345600
21-04-13 00:28 21-04-13 00:38 1 14073 379650 duqnawh32hp4u 90128 7075872 234656 345600
[code]....
Following are the details in AWR report (00:00 til 01:00 of 21-Apr-2013) .... not thet the error was produced at 00:42
Undo Segment Summary DB/Inst: DBCPY/dbcpy01 Snaps: 18853-18854
-> Min/Max TR (mins) - Min and Max Tuned Retention (minutes)
-> STO - Snapshot Too Old count, OOS - Out of Space count
-> Undo segment block stats:
-> uS - unexpired Stolen, your - unexpired Released, uU - unexpired reUsed
[code]....
Undo Advisor information taken 'now' is as following
SQL> select dbms_undo_adv.longest_query(sysdate-2,sysdate) from dual;
DBMS_UNDO_ADV.LONGEST_QUERY(SYSDATE-2,SYSDATE)
----------------------------------------------
379650
SQL> select dbms_undo_adv.required_retention from dual;
[code]....
In above situation what should be my first choice (assuming increasing space is not an issue) - increase undo tablespace or increase undo retention?
If latter is the choice then what should be the value? Because as I understand present 96000 value is taken as lower limit and because of auto tuning the actual value (TUNED_UNDORETENTION) being used was 345600 In that case shall I set it to something > max(maxquerylen) i.e 379,650 + X?Or I shall increase the undo tablespace size?
From Undo Advisor output it looks to me that even if I increase the undo retention to 379650 current undo size will be able to support it (may be at the expense of DMLs)Is that right?
Performance Tuning :: Not In Replace With Minus
Sep 15, 2011I have 2 questions for this SQL Statement for tuning?
select * from a where id not in (select a_id from b)
1- How do i change this query with A MINUS OPERATOR
2- Shall i use a Hint for this query?
Explain plan is:
Execution Plan
--------------------------------------------------------------------------------
Plan hash value: 31652112322
--------------------------------------------------------------------------------
-
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time
|
--------------------------------------------------------------------------------
-
| 0 | SELECT STATEMENT | | 299 | 21528 | 9 (12)| 00:00:01
|
|* 1 | HASH JOIN RIGHT ANTI| | 299 | 21528 | 9 (12)| 00:00:01
|
|* 2 | TABLE ACCESS FULL | b | 1 | 23 | 4 (0)| 00:00:01
|
| 3 | TABLE ACCESS FULL | a | 300 | 14700 | 4 (0)| 00:00:01
|
--------------------------------------------------------------------------------
-
How do i optimize it best?
Performance Tuning :: Getting Alternative To REPLACE Function?
Jun 12, 2010I have a table with:
1 million rows
average row length 200 bytes
50 columns
and this update statement
UPDATE mytable SET varchar2_4000_column = replace(replace(replace...300 times)
It looks at every row in the table (no WHERE clause) and does these 300 replace operations on this column for each row. Each replace replaces with a null so effectively it is removing strings. Much of the time these strings are not in the column.
This update statement takes 25 minutes and it is 98% CPU and 2% USER_IO time.
I figure that is what is taking all the time since it is a CPU bound statement. if rows in this table are persistent over time then tag rows with a flag to show which ones have already been processed and skip these next time around.
SQL & PL/SQL :: REPLACE ON USER_MVIEWS / Number Cannot Be Replace
Jul 16, 2010I have 70 materialized views where I need to replace the FROM SCHEMA1 TO FROM SCHEMA2...To quickly to do the fix for all the 70 views..
SELECT REPLACE (QUERY, 'schema1', 'schema2' )FROM USER_MVIEWS ;
But It throws me an error that Number cannot be replace.
SQL & PL/SQL :: Decode With Like Operator
Jul 12, 2013I need to get create_user_id for different sale_location_id.Also create_user_id field will be having different values.This is part of my big query.I need to add this stmt in that.So taken that part and figuring it out.
create table it(sale_location_id number,create_user_id varchar2(10));
table IT created.
insert into it values(1,'ISRA')
1 rows inserted.
insert into it values(2,'USFA')
1 rows inserted.
select a.sale_location_id,decode(a.sale_location_id,1,a.create_user_id like 'IS%',a.create_user_id like 'U%') create_user_id from it a
given error as:
ORA-00907: missing right parenthesis 00907. 00000 - "missing right parenthesis"
How to write this.
SQL & PL/SQL :: Uses Of Check Operator
Sep 16, 2010I have a table in SQL , I am creating a column Of name in it , i want to restrict user to enter name in Capital only ,and i want to create this at table level . I tried Check Operator but failed .
create table my_tab
(U_name varchar2(30) ,
constraint ck_check (U_name = upper(m_name))
/
SQL & PL/SQL :: Alternate To Like Operator
Mar 15, 2013Any alternate to the following query.
select * from emp where ename like upper(NVL('%mi%',ename));
Basically I want to search based on string or null.
SQL & PL/SQL :: Using 2 Union Operator
Jun 28, 2010I have an query i.e.
I want 3 lines input in 1 line using 2 union operator like
Input:-
'i love playing
football and
volleyball'
i want the output like:-
"i love playing football and volleyball"
solve query using 2 union operator?
SQL & PL/SQL :: Minus Operator And NULL
Feb 12, 2013I have a two tables with same column name , I wanted to find different record in table1 when compared with table2
create table table1(col1 number,col2 number,col3 number,col4 number,col5 number);
create table table2(col1 number,col2 number,col3 number,col4 number,col5 number);
insert into table1 values(1,2,NULL,NULL,NULL);
insert into table2 values(1,2,NULL,NULL,NULL);
commit;
select col1 from (select col1,col2,col3,col4,col5 from table1 minus select col1,col2,col3,col4,col5 from table2);
no rows selected
how come i get no rows selected when col3,col4,col5 is having null values but NULL could be anything so
NULL-NULL cannot be equal to zero how is it possible
Forms :: Use Like Operator With If Condition?
Jan 19, 2013i want to know that how can i use like operator with if condition. i m using oracle10g form builder and it's for search purpose .
for example ...
if search string=string2 then
message('Record found');
end if ;
i want to use like '%search string%'.
SQL & PL/SQL :: Escape Operator Symbol?
Feb 28, 20111) Can we set a different symbol other than '' for escape operator.
2) If yes, how to see the current escape operator symbol.
3) How to find out the below name with escape operator?
Employee name ----> rama_krishna_raj
SQL & PL/SQL :: Difference Between IN And EXISTS Operator
Jan 10, 2012what the difference between IN and EXISTS operator. Why should we use EXISTS operator?
View 1 Replies View RelatedSQL & PL/SQL :: Oracle 10g Quote Operator
Sep 7, 2011I have a issue on running the query with quote operator . When I am executing the SQL query I am getting error "Quoted String not properly Ended".
select q'[Oracle's world ]'
from dual
But The following query works.
select q'[It's Oracle's world ]'
from dual
PL/SQL :: Rownum In UNION Operator
Feb 18, 2013I have a requirement in SQL that I have to number each row. Hence I thought of using ROWNUM. But the sql query I'm using uses UNION operator. Hence I used like this
select a,b,rownum as 'field1' from table1
union
select c,d,1 as 'field1' from table2
Will the above query solve my purpose?
Optimizer Cannot Merge A View That Contains Set Operator
Jul 18, 2012Query -
SELECT *
FROM sysadm.ps_tmtl_post_vw a
WHERE a.month_prepared_for = 'JUNE,2012'
AND a.ca_status = 'P5 CUST GO AHEAD'
[code]...
When I try for the SQL-Tuning sets its throws error that
ADDITIONAL INFORMATION SECTION
-------------------------------------------------------------------------------
- The optimizer could not merge the view at line ID 2 of the execution plan.
The optimizer cannot merge a view that contains a set operator.
I read earlier forum where it says that optimizer unable to interpret the conditions like order by etc etc.Now there is one view which is getting used in the query when I did select * from vw it took more than 16 hrs to complete. (bad view).
Attached File(s)
exec_plan.txt ( 2.06MB )
Number of downloads: 1
view_def.txt ( 14.12K )
Number of downloads: 2
Error ORA 920 / Invalid Relational Operator
Jul 30, 2010The following runs no problem
SELECT
ACCO.SEQUENCE,
ACCO.DESCRIPTION,
MAX (ACCO.AUDIT_DTE)
FROM
PAS.AUDIT_CLINICAL_CARE_OPTIONS ACCO
WHERE
ACCO.AUDIT_DTE < :AuditDate AND
[code]....
However, when I try to add extra conditions to the status' in the sub select i get the error. This is one way I tried:
SELECT
ACCO.SEQUENCE,
ACCO.DESCRIPTION,
MAX (ACCO.AUDIT_DTE)
FROM
PAS.AUDIT_CLINICAL_CARE_OPTIONS ACCO
WHERE
[code]....
I've tried repeating the sub select for each of the extra status parts but everytime i hit the same problem.
SQL & PL/SQL :: Using Union Operator And Sort By Month?
Jan 10, 2012i got the data like
select * from Table1
SNO Name B_MONTH
--------------------
101 A Mar
102 B Jan
103 C Feb
104 D Apr
105 f May
106 G Jun
Select * from Table2
107 H Dec
108 I Aug
109 J Oct
110 L Jul
111 M Sep
112 N Nov
select * from table1 union select * from table2 order by 3
The B_MONTH column is in Varchar2. Expected output should be
Output:
Jan
Feb
Mar
Apr
.
.
.
.
Nov
Dec
SQL & PL/SQL :: Difference Between Concat Function And (||) Operator?
May 6, 2013Want to understand difference between Concat function and "||" operator. I am getting the same result for both. Below is the test case for your reference.
Select 'H '||' S' From Dual;
--Output H S
Select Concat('H ',' S') A From Dual;
--Output H S
Select Length('H '||' S') A From Dual;
--Output 6
Select Length(Concat('H ',' S')) A From Dual;
--Output 6
Forms :: How To Compare Two Text Boxes With IN Operator
Jun 12, 2012How we can compare IN operator between two text boxes in form
I have two text boxes on form
control.txt1 - 003
control.txt2 - 001,002,003
On button pressed
if :control.txt1 in (:CONTROL.TXT2) THEN
MESSAGE('1');
MESSAGE('1');
else
MESSAGE('0');
MESSAGE('0');
END IF;
All the time Message is 0 .
SQL & PL/SQL :: Select From Dual Versus Equals Operator?
Mar 14, 2011I have a package function which is wrapped and I cannot see the code.The package function raises an user-defined exception when :
SELECT ABC.*
FROM ABC
WHERE ABC.A = PACK.FUNC(ABC.B,ABC.C)
But it does not raise any exception and the query works absolutely fine generating desired results when :
SELECT ABC.*
FROM ABC
WHERE ABC.A = (SELECT PACK.FUNC(ABC.B,ABC.C) FROM DUAL)
Forms :: Details On Mouse Click Using Like Operator?
Jun 9, 2013I want to link to blocks using description as there is no relation , for example i have two tables with one field in common called description, and i want to link this field in two tables using like operator.
create table item ( item_code varchar2(12),item_name varchar2(30));
insert into item VALUES('A','HEA160');
insert into item VALUES('B','HEA180');
create table stk (sl_item varchar2(12),sl_desc varchar2(30),sl_qty number);
insert into stk VALUES ('X','HEA160X1000',12);
insert into stk VALUES ('X','HEA160X2000',4);
insert into stk VALUES ('Y','HEA180X3000',10);
Suppose i click on item block item_desc with value on HEA160 all the items similar to that should appear in stk block like 'HEA160X1000' ,'HEA160X2000' , if i click on 'HEA180' on item then 'HEA180X3000' it should come.