SQL & PL/SQL :: NULL Usage?
Mar 31, 2011 when to use || NULL oerator or what is the meaning of this statement when it is used with the column name.
and A.RtmtCd = B.RtmtCd|| NULL
or
A.RtmtCd||NULL IS NOT NULL
ADVERTISEMENT
SQL Query To Find CPU Usage And Memory Usage
Jun 28, 2013Is their any query to find cpu usage & memory usage of all the queries currently running on DB?
View 5 Replies View RelatedSQL & PL/SQL :: Hierarchical Query - Connect NON-NULL Rows To Preceding NULL Row
Aug 29, 2012I have the following query:
select col_1,col_9 from
book_temp b
where b.col_1 is not null
order by to_number(b.col_16)
;
What I want to add is the following:
COL_9
=====
NULL
A
B
NULL
C
D
E
F
NULL
G
I need to connect the NON-NULL rows to the preceding NULL row.
SQL & PL/SQL :: Counting NULL Vs NON-NULL In A GROUP BY Clause
Jun 21, 2010I am running a GROUP BY query on a few columns of enumerated data like:
select count(*), Condition, Size
group by Condition, Size;
COUNT(*) CONDITION SIZE
-------- ---------- --------
3 MINT L
2 FAIR L
4 FAIR M
1 MINT S
Well, let's say I also have a timestamp field in the database. I cannot run a group by with that involved because the time is recorded to the milisec and is unique for every record. Instead, I want to include this in my group by function based on whether or not it is NULL.
For example:
COUNT(*) CONDITION SIZE SOLDDATE
-------- ---------- -------- ----------
3 MINT L ISNULL
2 FAIR L NOTNULL
2 FAIR M NOTNULL
2 FAIR M ISNULL
1 MINT S ISNULL
SQL & PL/SQL :: Date Field - Not Null Column To NULL
Mar 16, 2011I have a table which has a not null column. the column is date field. I am trying to change it to Null. But it is giving a error.
I am using below query.
ALTER TABLE T_test
modify (paid_to_date null)
SQL & PL/SQL :: Unique Null And Multiple Non-null
Oct 24, 2013create table test
(
id int ,
dat date
)
/
I want to implement a business rule such as we have for each id at most 1 dat null. So, I've created this unique index on test.
create unique index x_only_one_dat_cess_null on test(id, case when dat_cess is null then 'NULL' else to_char(dat_cess, 'dd/mm/yyyy') end);
insert into test values (1, sysdate);
insert into test values (1, sysdate - 1);
insert into test values (1, null);
insert into test values (1, null);
-- -----
insert into test values (2, sysdate);
insert into test values (2, sysdate - 1);
insert into test values (2, null);
The 4th insert will cause an error and this is what I wanted to implement. OK. Now the problem is that for non-null values of dat, we can't have data like this
iddat
------------
124/10/2013
123/10/2013
123/10/2013
1
because of the unique index (the 2nd and the 3rd row are equal). So just for learning purposes, how could we allow at most one null value of dat and allow duplicates for non-null values of dat.
SQL & PL/SQL :: How To Modify Null Column To Not Null
Jan 9, 2012when i follow this steps mention on this website
[URL].........
to modify column from null to not null i got this error and on this website its show successful
my steps are
first i create a table
SQL> create table Stu_Table(Stu_Id varchar(2), Stu_Name varchar(10),
2 Stu_Class varchar(10));
Table created.
Then insert some rows into Stu_Table
SQL> insert into Stu_Table (Stu_Id, Stu_Name) values(1,'Komal');
1 row created.
SQL> insert into Stu_Table (Stu_Id, Stu_Name) values(2,'Ajay');
1 row created.
SQL> insert into Stu_Table (Stu_Id, Stu_Name) values(3,'Rakesh');
1 row created.
SQL> insert into Stu_Table (Stu_Id, Stu_Name) values(4,'Bhanu');
1 row created.
SQL> insert into Stu_Table (Stu_Id, Stu_Name) values(5,'Santosh');
1 row created.
SQL> select * from Stu_Table;
ST STU_NAME STU_CLASS
-- ---------- ----------
1 Komal
2 Ajay
3 Rakesh
4 Bhanu
5 Santosh
Table Structure is like this
SQL> Describe Stu_Table
Name Null? Type
----------------------------------------- -------- ----------------------------
STU_ID VARCHAR2(2)
STU_NAME VARCHAR2(10)
STU_CLASS VARCHAR2(10)
now when i try to modify this Stu_id column to not null its give me error.
SQL>ALTER TABLE Stu_Table MODIFY Stu_Id int(3)not null;
ALTER TABLE Stu_Table MODIFY Stu_Id int(3)not null
*
ERROR at line 1:
ORA-01735: invalid ALTER TABLE option
and when i try to add new column with not null its also gives me error
SQL> ALTER TABLE Stu_Table add C1_TEMP integer NOT NULL;
ALTER TABLE Stu_Table add C1_TEMP integer NOT NULL
*
ERROR at line 1:
ORA-01758: table must be empty to add mandatory (NOT NULL) column
SQL & PL/SQL :: Function In Oracle To Select Not-null Columns At Beginning And Null Columns At End?
Jul 12, 2012I have 8 columns. Some of them might be null.I want to display all 8 columns in my result. Not null columns will be first and null at the end.Here is a sample data :
Employee table :
Employee_id Emp_fname emp_lname emp_mname dept salary emp_height emp_weight
1 aaa ddd d1 100 6 180
2 bbb ccc 120 169
3 dfe d2 5.9 223
The expected result is :
result1 result2 result3 result4 result5 result6 result7 result8
1 aaa ddd d1 100 6 180
2 bbb ccc 120 169
3 dfe d2 5.9 223
SQL & PL/SQL :: Regarding NVL Function Usage
Oct 20, 2011There is an 'emp' table with a column name as 'mgr' with datatype 'number'. following is the detailed description of the table:
SQL> desc emp;
Name Null? Type
----------------------------------------- -------- ---------------------------
EMPNO NOT NULL NUMBER(4)
ENAME VARCHAR2(10)
JOB VARCHAR2(9)
MGR NUMBER(4)
HIREDATE DATE
SAL NUMBER(7,2)
COMM NUMBER(7,2)
DEPTNO NUMBER(2)
Now when I run the 'select mgr from emp e;' query the output which I get is:
7902
7698
7698
7839
7698
7839
7839
7566
7698
7788
7698
7566
7782
Note: One value in between here is null, the required to me is that I want to print a character value 'President' in place of null .
PL/SQL :: How To Check CPU Usage
Mar 6, 2013I have one procedure which is executing daily two times(i.e morning run and evening run) . In morning run it's executing around 150 mins and evening run executing around 25 mins.
It's happening for all procedures executing in longer run in morning. There is NO LOCKS, I have checked LOCKS while executing morning run. I suspects CPU usage in morning run.
How to check CPU usage ? AND also each session how much utilizing CPU. I'm using oracle 8i database, I know it's older version but my company is using oracle 8i. So i have to look in this database version only.
PL/SQL :: How To Update Null Data With Previous Not Null Data
Oct 25, 2012Initially i have inserted the data into table like
Date xxx yyyy
1/1/12 1 1
2/1/12 null null
3/1/12 null null
4/1/12 1 1
5/1/12 1 1
6/1/12 null null
in above example data is null for some date here my requirement is how can i copy before not null data(1/1/12) to *2/1/12, 3/1/12* .
SQL & PL/SQL :: Usage Of Hints In The Views
Oct 11, 2011I have a table "tl" which is partitioned--say 30 partition and for each partition there is a seperate view like as follows
create view view_t130 as select * from tl partition (p30);
create view view_t129 as select * from t1 partition (p29);
.
.
.
create view view_t101 as select * from t1 partition (p01);
my question is how to use hints on this table if your are using view to access the data from internal table.
Normal structure is if i don't wrong:-
index( <<view name|view alia name>> <<table name|table alias name>> name of index)
Consider my case
select * from view_t130 where <index_column> --not picking up index
i want to give expicit index hint.so i used the same structure that i specified above but it didn't work.
select /*+ index( view_t130 t1 <index_name) */ * from view_t130 where <index_name>
how to give explicit index hint..but one constraint is i cannot give any alias names for internal tables because those(view structure) are generated by predefined scripts..so it's not possible to change it.
SQL & PL/SQL :: Function BFILENAME() Usage?
Jul 31, 2011 I had a question on BFILENAME() :
first,
create or replace directory UTL_FILE_DIR as 'k:lob_test';
GRANT READ,WRITE ON DIRECTORY UTL_FILE_DIR TO user1;
and then ,I login use user : user1
create or replace package body p_utl_mail_attach_raw as
procedure send_single_user_attach_raw(........)
fil BFILE;
filenm VARCHAR2(50) := 'aaa.jpg'
begin
fil := BFILENAME('UTL_FILE_DIR', filenm);
end ;
this result it show :
UTL_FILE_DIR/aaa.jpg, exists=F, length=0, open=F
SQL & PL/SQL :: Conditional Sequence Usage?
Jan 31, 2013I'd like to have a conditional that only gets the next value from a sequence is the current (or supplied) value is null.
Here are some trivial examples:
CREATE SEQUENCE ts
MINVALUE 1
START WITH 1
INCREMENT BY 1;
SELECT ts.NEXTVAL FROM DUAL;
SELECT COALESCE(ts.CURRVAL, ts.NEXTVAL) FROM DUAL;
SELECT NVL(ts.CURRVAL, ts.NEXTVAL) FROM DUAL;
SELECT CASE
WHEN ts.CURRVAL IS NOT NULL THEN ts.CURRVAL
ELSE ts.NEXTVAL
END
FROM DUAL;
Ideally multiple executions of any of these (or a better one of your design) should return the same value from the sequence, but mine do not.
Created Partition - Usage?
Nov 9, 2012I have one table and I created partition month wise. I also creates index on that table. How can I check whether parition will be used when I query that table? In explain plan I can see PARTITION RANGE as ALL. Is it using the partition?
View 2 Replies View RelatedHow To Find CPU Usage By Each User Session
Sep 7, 2011I can get "CPU used by this session' value from v$sesstat. That is the value in centiseconds used by each session. How to convert the value into a percentage of total CPU resource ?
Or there are some other ways to gain the value. i.e. Percentage of Total CPU usage for each Oracle session.
Analytic Functions / TEMP Usage?
Jan 26, 2011I am building a reporting table using the count analytic function in order to count up several different attributes in one statement.What I find is that this method quickly eats up my TEMP space. This is 10gR2. I have attempted to use MANUAL workarea policy with as large ofsort_area_size as possible (2G) but that does not seem to have any effect on performance or TEMP usage. The RAW table is about 12G with 75 million rows. I am not that concerned about execution time, but rather TEMP usage.
--INSERT into <object>...
select distinct
file_sid,filename,control_numb,processing_date,file_class,
vendor_id,vendor_desc,
c_status_id,c_status_desc,
[code]...
I am not seeing any increase in onepass or multipass executions on the PGA during execution of this statement using...
SELECT CASE WHEN low_optimal_size < 1024*1024
THEN to_char(low_optimal_size/1024,'999999') ||
'kb <= PGA < ' ||
(high_optimal_size+1)/1024|| 'kb'
ELSE to_char(low_optimal_size/1024/1024,'999999') ||
[code]...
I'd like to get a better explaination of how analytics use the instance resources and TEMP space. For example if I add
a count with a different window (such as the last two columns commented in the above query) I blow out my temp space (70G).
Is the critcal factor the use of distinct? or multiple windows? or something else?
SQL & PL/SQL :: Usage Of Cursors In Stored Procedure
Feb 22, 2012i have created a stored procedure with a cursor in order to perform a function where the annual_sal from the employee_annual_sal table is refered and checked. The empno for all the records which satisfies the condition mentioned inside the loop should be displayed in an variable. My code is below
create or replace PROCEDURE sp_test_cursor(out_empno OUT number)
IS
v_get_data number;
v_get_empno number;
cursor c1 is
select annual_salary
from employee_annual_sal;
[Code]...
What should i do to return mulitple values in a single variable??
SQL & PL/SQL :: Instr Function And Index Usage
Apr 14, 2012I have a requirement where the user input values will be passed as comma separated string to backend, which is queried against the table using instr. But the index present on the table is not using the index , due to the instr function.How can I create a index in such a way that The instr function uses it.
CREATE TABLE TEST_IDX
(
CCN VARCHAR2(10 CHAR),
SKU_NUM VARCHAR2(10 CHAR),
MOD VARCHAR2(10 CHAR),
SKU_STATUS VARCHAR2(2 CHAR),
RPT_FLAG VARCHAR2(2 CHAR),
CYCLE_AS_OF_DATE DATE,
SMP_IDENTIFIER NUMBER,
MEASURE_NAME VARCHAR2(100 CHAR)
);
CREATE INDEX TEST_IDX1 ON TEST_IDX
(CCN, SMP_IDENTIFIER, MOD, CYCLE_AS_OF_DATE, RPT_FLAG,
MEASURE_NAME);
The below query is going for full table scan due to this.
select * from test_idx where (INSTR (','||'E10000'||',', ',' || ccn || ',') <> 0 OR 'E10000' = 'DEFAULT')
and mod='90396' and rpt_flag='O' and smp_identifier=2
how to recreate the above index so that these queries uses this index.
Listing Usage To Get O/p In A Specific Form?
Mar 18, 2013 I have a table with data in below format:
Table A
Id Value
1 R
2 S1
2 S2
3 T
the o/p in below format:
Col
R|S1|T
R|S2|T
The general is that multiple value for any given id must be aggregated separately.
CDC Publish / Subscribe Usage With ETL On Oracle 10g
Oct 12, 2012I have a question about the CDC publish/subscribe usage with ETL on Oracle 10g. Is the ETL logic code part of the subscriber part? In other words, when the publisher is notified of a record change and sends the record to the staging area then calls the subscriber. Is the subscriber that runs the ETL logic that processes the record before it is sent to the DW/Dim tables? Something like this flow:
Source Database ---> Change table/Publish ---> Subscribe view/ETL ---> Target Database
SQL & PL/SQL :: What Is A Global Procedure In Oracle And Its Usage
Aug 6, 2010what is a global procedure in oracle and its usage
View 5 Replies View RelatedOracle Apps 11i - Limited Memory Usage?
Nov 5, 2012We are running Oracle Apps 11i on Windows 2003 R2 Enterprise SP2 (32 bit). After enabling /3GB switch parameter in Boot.ini file, the OS recognizes the 8GB RAM and consumes it upto 5.6GB during non-peak hours but as workload increases in evening when end users generate auto receipts the same memory usage ratio reaches upto 6GB resulting the OS gets hang and don't respond at all. Inspite of having 2GB free memory it doesn't consume it. We have to shut down it by pressing the power off button and restart it
The system configuration is as under:
HP ProLiant DL380 G6
Intel Xeon 2.4 GHz
8GB RAM (4 x 2 GB)
RAC & Failsafe :: Memory Usage Increasing On Oracle
Jan 10, 2012After the reboots each system was using around 30 GB of memory... now that it's been up for a week memory is up to 98GB used on each system. None of the systems are swapping.
Mem: 98999084k total, 97937116k used, 1061968k free, 774900k buffers
Swap: 16779884k total, 0k used, 16779884k free, 89510312k cached
Performance Tuning :: TEMP Usage History
Jul 19, 2010My stats jobs failed last night with "ORA-01652 :Unable to extend TEMP" error.
Is there any way to check this history data, what other session was using TEMP tablespace extensively ?
SQL & PL/SQL :: Usage Of Context Variables Inside The Trigger?
Feb 17, 2010Am trying to use the SYS_CONTEXT variables inside a trigger. After reading the documentation I found that the below query when used inside the trigger code will return the trigger owner.
Select Username from User_Users
Will any of the below variables return the trigger owner when used inside the trigger code
sys_context('USERENV','CURRENT_USER')
or
sys_context('USER','CURRENT_SCHEMA')
Client Tools :: Usage Of Package In 10g Form
Mar 16, 2013I have made a package and define a variable in it as:
CREATE OR REPLACE package Scott.My_Pac as
CNT_UPD_USR Varchar2(20)
END My_Pac;
When I used the following in Toad it works fine but when I use the same in 10g form it gives the error "Cannot directly access remote package variable or cursor".
Begin
Scott.My_Pac.CNT_UPD_USR := 'Ali';
DBMS_OUTPUT.PUT_LINE(Scott.My_Pac.CNT_UPD_USR);
End;
Performance Tuning :: Query With High Cpu Usage?
Jan 13, 2009Is there any way to tune the following query using lot of CPU:-select description,time_stamp,user_id from bhi_tracking where description like 'Multilateral:%'The explain plan for this is query is:-
---------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost |
----------------------------------------------------------------
| 0 | SELECT STATEMENT | | 178K| 6609K| 129K|
| 1 | TABLE ACCESS FULL| BHI_TRACKING | 178K| 6609K| 129K|
----------------------------------------------------------------
Bhi_tracking is used for reporting purpose and contain millions of records.Generally we keep one year data in this table and delete the remaining.Can I drop the table after taking export and then import it back or can i truncatethe table and then insert the rows into it to enhancethe performance.
SQL & PL/SQL :: Avoid NVL Condition Suppressing Index Usage?
Feb 1, 2012I have index on column column1 and because of the nvl, the optimizer is not picking up the index
How can I restructure the query to avoid nvl giving same result using index on column1?
now column1 and column2 are varchar2 fields here
where nvl(column1,'*')=(nvl(:param1,nvl(column2,'*'))
can I use case statement like
case when column>'' then .. stuckup here
11.2 Version Of Database Server - V$object Usage?
Nov 16, 2012how many rows created (replaced ?) und stored in v$object_usage on each fact of index scan? I'm using 11.2 version of database server
View 7 Replies View Related