SQL & PL/SQL :: Difference Between Deterministic Functions And Function Result Cache In 11g
Oct 30, 2012difference between Difference between Deterministic functions and Function result cache in 11g?
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SQL & PL/SQL :: What Is Advantage Of Deterministic Function Over Normal Function
Jun 10, 2010What is advantage of Deterministic function over normal function?
What is the diff B/W Deterministic function and normal function and also give me a example in which scenario we use Deterministic function?
Real Application Clusters :: Difference Cache Fusion and Cache Coherency
Jun 20, 2013What is the difference between cache fusion and Cache Coherency. Both are same or different functionality.
View 1 Replies View RelatedPL/SQL :: Oracle 11g / R2 Query Result Cache - Incremental Update
Oct 15, 2012In Oracle 11g/R2, I created replica of HR.Employees table & executed the following statement (+Although using SUM() function is non-logical in this case, but just testifying the result+)
STEP - 1
SELECT /+ RESULT_CACHE */ employee_id, first_name, last_name, SUM(salary)*
FROM HR.Employees_copy
WHERE department_id = 20
GROUP BY employee_id, first_name, last_name;
EMPLOYEE_ID FIRST_NAME LAST_NAME SUM(SALARY)
-------------------------------------------------------------------------------------------------------
202 Pat Fay 6000
201 Michael Hartstein 13000
Elapsed: 00:00:00.01
Execution Plan
----------------------------------------------------------
Plan hash value: 3837552314
--------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 2 | 130 | 4 (25)| 00:00:01 |
| 1 | RESULT CACHE | 3acbj133x8qkq8f8m7zm0br3mu | | | | |
| 2 | HASH GROUP BY | | 2 | 130 | 4 (25)| 00:00:01 |
|* 3 | TABLE ACCESS FULL | EMPLOYEES_COPY | 2 | 130 | 3 (0)| 00:00:01 |
Statistics
----------------------------------------------------------
0 recursive calls
0 db block gets
0 consistent gets
0 physical reads
0 redo size
*690* bytes sent via SQL*Net to client
416 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
2 rows processed
STEP - 2
INSERT INTO HR.employees_copy
VALUES(200, 'Dummy', 'User','Dummy.User@email.com',NULL, sysdate, 'MANAGER',5000, NULL,NULL,20);
STEP - 3
SELECT /*+ RESULT_CACHE */ employee_id, first_name, last_name, SUM(salary)
FROM HR.Employees_copy
WHERE department_id = 20
GROUP BY employee_id, first_name, last_name;
EMPLOYEE_ID FIRST_NAME LAST_NAME SUM(SALARY)
--------------------------------------------------------------------------------------------------
202 Pat Fay 6000
201 Michael Hartstein 13000
200 Dummy User 5000
Elapsed: 00:00:00.03
Execution Plan
----------------------------------------------------------
Plan hash value: 3837552314
--------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 3 | 195 | 4 (25)| 00:00:01 |
| 1 | RESULT CACHE | 3acbj133x8qkq8f8m7zm0br3mu | | | | |
| 2 | HASH GROUP BY | | 3 | 195 | 4 (25)| 00:00:01 |
|* 3 | TABLE ACCESS FULL| EMPLOYEES_COPY | 3 | 195 | 3 (0)| 00:00:01 |
Statistics
----------------------------------------------------------
0 recursive calls
0 db block gets
4 consistent gets
0 physical reads
0 redo size
*714* bytes sent via SQL*Net to client
416 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
3 rows processed
In the execution plan of STEP-3, against ID-1 the operation RESULT CACHE is shown which shows the result has been retrieved directly from Result cache. Does this mean that Oracle Server has Incrementally Retrieved the resultset?
Because, before the execution of STEP-2, the cache contained only 2 records. Then 1 record was inserted but after STEP-3, a total of 3 records was returned from cache. Does this mean that newly inserted row is retrieved from database and merged to the cached result of STEP-1?
If Oracle server has incrementally retrieved and merged newly inserted record, what mechanism is being used by the Oracle to do so?
Performance Tuning :: Demonstrate Working Of OCI Client Result Cache?
Jan 2, 2013I'm trying to demonstrate the working of the OCI client result cache. I've set some parameters,orcl> sho parameter result_cache
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
client_result_cache_lag big integer 3000
client_result_cache_size big integer 1000000
result_cache_max_result integer 5
result_cache_max_size big integer 1984K
result_cache_mode string FORCE
result_cache_remote_expiration integer 0
If I understand the docs correctly, that should be all that is needed.I've complied and run the cdemoqc and cdemoqc2 OCI demos, but I never get anything in the V$CLIENT_RESULT_CACHE_STATS or CLIENT_RESULT_CACHE_STATS$ views. This is probably because the sessions exit after running the queries.
So I've also tried repeating arbitrary queries through cdemo2, which gives a persistent session, but there is still nothing in those views and furthermore the v$result_cache_objects.scan_count for my queries keeps increasing. So I don't think think the client side cache is working.
Analytic Functions - Pretend Result
Feb 24, 2012I have a question regarding analytic functions. I've been working with some functions, but I can't achieve the one which gives me the pretend result. I know to resolve this without using a function, with a internal select, but I think the analytical function is faster and proper.
I've got the following data:
Brand Qt
A 150
B 200
C 50
D 100
I wanna be following output;
Brand Overall %
A 30
B 40
C 10
D 20
SQL & PL/SQL :: Difference Between Stand Alone Function And Function Declared In A Package?
Mar 11, 2010What is the Difference between a Stand Alone Function/Procedure & a Function/Procedure declared in a Package.
View 2 Replies View RelatedDifference Between Cache Buffer Chain Latch And Buffer Busy Wait
Jul 30, 2012Does cache buffer chain latch and buffer busy wait event are related to one any another.
Latch definition from Google says : Latches are simple, low-level serialization mechanisms to protect shared data structures in the system global area (SGA).
what does it mean my protect. Does this mean protects from aging as per LRU algorithm and getting removed from SGA
or
protect from other processes ,say from example from simultaneously DML operations.
or
both
Does buffer busy wait event occurs , because of the cache buffer chain latch ?
PL/SQL :: Writing User Defined Function The Same Way As The Oracle Functions
Sep 26, 2012In one of the interviews , I have attended the guy asked me to write a user defined function which will take the column name and list all the values .
For example
Table Name:Employees
Column Name: Employee_Name
Employee_name
Scott
Ivgun
Jack
Shane
The query should be in this fromat
SELECT col_agg(Employee_name) emp_name from Employees;
The output should be
Emp_names
scott,ivgun,jack,shane
SQL & PL/SQL :: Use DECODE Function For Getting Result
Aug 28, 2012I have a table like Create temptbl (Client_status CHAR(1), Rollbak NUMERIC(3), count_org NUMERIC(3), count_member NUMERIC(3))
With Values
Cliet_Status Rollbak count_org count_member
------ ------- --------- ------------
Z 3 7 5
P 39 5 8
R 49 1 6
S 5 6 4
I need to use DECODE function for getting the result like
IF client_status NOT IN('Z', 'P')
THEN rollbak in(7, 39,49,10)and count_org is not null and count_member is not null.
ELSE NULL
SQL & PL/SQL :: Assignment In Result In Decode Function
Dec 13, 2011I have 3 tables.
Table 1 have 3 columns
ID, CUS_NAME, LOC
insert into table1 values (001,ABC,North);
insert into table1 values (002,DEF,South);
insert into table1 values (003,GHI,West);
Table 2 have 3 columns
ID, CUS_NAME, LOC
insert into table2 values (001,ABC,North);
insert into table1 values (002,DEF,East);
insert into table1 values (003,JKL,South);
Table 3 is Result_Tab table having 8 columns
ID, TAB1_CUS_NAME, TAB2_CUS_NAME, Cus_Name_Res, TAB1_CUS_LOC, TAB2_CUS_LOC, Cus_LOC_Res, Comment.
I have written two cursors which fetches data from both the tables and compares each data between each other and inserts the value into the result table.
the code is as follow:
Insert into Result_Tab values
(T1.ID, T1.Cus_Name, T2.Cus_Name, decode(T1.Cus_Name,T2.Cus_Name,'Y','N'),T1.LOC, T2.LOC, decode(T1.LOC,T2.LOC,'Y','N'),Null);
Now I want the resul as follows:
ID T1.N T2.N N_Res T1.L T2.L L_Res Comment
001 ABC ABC Y North North Y Null
002 DEF DEF Y South East N Loc
003 GHI JKL N West South N Name, Loc
Is there a way wherein i could capture the column names in decode function when it doesn't match, so that I can insert the same in the comment column.
Function To Take In Expression And Fetch The Result
Jun 5, 2009I have an arithmatic expression which is dynamic say
expression = [Col5]/[Col1]
I will be using this in building a dynamic SQL.so i have to make sure that the divisible by zero is taken care. In the expression Col1,Col5 are values coming from a SQL.
For the above expression, my conversion will be
ROUND( ((CCol4 / DECODE (CCol1, 0, NULL, CCol1) )), 0).
I have to build a function which takes in the expression and fetches me the result.My expression can be any combination of arithmaticexpression involving columns.
Ex:
[Col4 + Col2]/[Col3-Col1]*[Col5].
TimesTen In-Memory :: AWT Cache Group With Cache Awt Parallelism
Jul 10, 2012I have some question.
TTversion : TimesTen Release 11.2.2.3.0 (64 bit Linux/x86_64) (tt112230:53376) 2012-05-24T09:20:08Z
We are testing a AWT cache group ( with CacheAwtParallelism=4 ).
Application(1 process) to the DML generates to TimesTen(DSN=TEST).
At this point, Are delivered to the 4 parallel DML?
[TEST]
Driver=/home/TimesTen/tt112230/lib/libtten.so
DataStore=/home/TimesTen/DataStore/TEST/test
PermSize=1024
TempSize=512
PLSQL=1
[code].......
SQL & PL/SQL :: How To Refer Result Of Inner Query (analytic Function) In Outer One
Feb 23, 2012How can I refer the result of inner query - max(t.col3) in the outer query. I tried the 'group by' but it is not performing well
select
t1.col5, t1.col6
from t1,
(select t.col1
t.col2
[code].......
SQL & PL/SQL :: Difference Between Procedure And Function
May 22, 2010I know difference between procedure and function.if we want a return value from procedure, we can have OUT parameter. Similarly with function, in addition to returning a value from function, it can also send an OUT parameter value as a return value. That means, in one or the other way we are able to get a return value from both program units. Normally, I would fill a OUT variable with error message when an exception occurs. I use this varaible,after procedure call, to detect if an exception occurred or not. Similar task can be performed by a function, it returns a true/false and a value thru OUT variables.
both program units return values in the form of OUT parameters. Where exactly should we use a function, where exactly should we use a procedure?
PL/SQL :: Difference Between Procedure And Function
Aug 25, 2012difference between Procedure and Function.We Know that Procedure is Basically Used to perform Actions and Functions are Basically Used for Calculations but what would be the exact difference since Actions/Calculations can be done in both Procedure and Functions.Which factors decide whether we need to write a Procedure and in which cases we need Function.
View 4 Replies View RelatedDifference Between Stored Procedure And Function?
Jan 12, 2010I have to call oracle stored procedure or a function to update user id of one or several rows depending on what user selects.
The oracle person will be writing the stored procedure or function. I am a java developer but was never involved in writing oracle functions. So..
I want to know what is the difference betn stored procedure and function?
From java point of view are there any guidelines when to prefer one over the other(betn stored procedure and function).
SQL & PL/SQL :: Difference In Num_rows And COUNT Function?
Dec 7, 2012SELECT COUNT(*) FROM APP.Big_table; Number of record--222653402
This is a big table to get the it's taking 8 minutes time, so that I tried the following SQL to get the count quickly.
SELECT num_rows FROM all_tables WHERE table_NAME='BIG_TABLE'
and owner='APP'; --Number of records 237213998
But I got the different count for the two SQLs. Why there is a difference in the count. Which one is correct.
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
PL/SQL :: Difference Between Translate And Replace Function
Jan 6, 2013Explain with the best example for difference between translate and replace function.
View 2 Replies View RelatedPL/SQL :: Difference In Num_rows And Count Function
Dec 7, 2012SELECT COUNT(*) FROM APP.Big_table; Number of record--222653402
This is a big table to get the it's taking 8 minutes time, so that I tried the following SQL to get the count quickly.
SELECT num_rows FROM all_tables WHERE table_NAME='BIG_TABLE'
and owner='APP'; --Number of records 237213998But I got the different count for the two SQLs. Why there is a difference in the count. Which one is correct.
SQL & PL/SQL :: Write A Function To Calculate Difference Between Two Dates?
Sep 22, 2011create or replace function getDate(p_joing_date Date,p_sysdate)
Return Date;
IS
v_compltd_mnths;
BEGIN
SELECT into v_compltd_mnths MONTHS_BETWEEN(TO_DATE('sysdate','MM-DD-YYYY'), TO_DATE('joing_date','MM-DD-YYYY') ) "Months"FROM DUAL;
return v_compltd_mnths;
END;
that i have worte..
Reports & Discoverer :: Difference Between Formula Column And Function In Program Unit?
May 24, 2013know when to use a formula column and when to use a function in program unit in oracle reports.
View 1 Replies View RelatedPL/SQL :: Calculate Difference By Which Day Count Of Difference Is Going?
Oct 17, 2012Detail table will look like below:
Product_id issue_date action_date Force_date
1 10/10/2012 10/10/2012 10/10/2012
2 10/10/2012 10/10/2012 10/10/2012
3 10/10/2012 13/10/2012 15/10/2012
[code]....
Need the data like
Issue_date count_action_date count_Force_date (diff(action_date,force_date) 1 2 3 4 5 6(days since over)
10/10/2012 3 4 1 4 2 1 0 0
How to get the data like this? automatically how to get 123.... and how to calculate the difference by which day the count of difference is going?
Index In Cache
Apr 21, 2013i have a application which uses 32 tables for retrieval in this 4 tables are important and have a size more than 100 mb can i move the index of these 4 tables cache memory to improve the applications retrieval performance if i done so ,then that will affect any other applications performance
View 1 Replies View RelatedHow To Set Sequence Cache
Oct 10, 2012Are there any recommendations or good practices to set sequence CACHE parameter (for example one caching per hour, day etc)?
View 4 Replies View RelatedCache Buffers Chains In RAC
Jun 1, 2012I have a query - whch used to be run in 30 minutes and now hangs on for hours and not finishing. The wait i see is
wait event latch: cache buffers chains.
This is a 11.1.0.7 2 Node RAC environment runing on HP-UX Itanium.
Procedure To Activate Cache
Aug 16, 2010i m working on oracle 10g using db_block_buffers. But i m not able to get information from database cache advice. Is there any method or procedure to activate cache advice despite of db_block_buffers use?
View 2 Replies View RelatedSQL & PL/SQL :: What Is Cycle And Cache In Sequence
Oct 11, 2011What is cache/no cache & cycle/no cycle in Sequence?what is the use?
View 3 Replies View RelatedData Buffer Cache
Feb 22, 2013how can we check the size of data buffer cache.
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