Performance Tuning :: Avoiding Bind Variable From Sql In Java Code?
Jun 15, 2010
We are on oracle 10.2.0.4 on Solaris 10 and have a perf. issue with a bind variable using query. The query is in java application. I want to test its performance when the query doesn't use bind variable and instead uses the passed value as literal. How can it be done?
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
---------- ---------- --------- ---------- --------- ---------- ---------- ----------
7839 KING PRESIDENT 17-NOV-81 5000 10
1 row selected.
But the statements will be taken as similar statements by oracle (due to :vn). Now I want oracle to take it as literal and the change for this has to be done in java code in my actual scenario which has a different query (but conceptually it uses bind variable and I want it to use passed value as literal). How can it be done?
since the optimizer (during explain plan) assumes all bind variable to be of varchar type, while checking plan for SQL statement using bind variable of numeric and date type shall we convert (typecast) it as following?
variable n_sal number variable dt_joining date exec n_sal:= 1000 exec dt_joining := '12-dec-2005' select first_name from emp_data where sal=to_number(n_sal) and joining=to_date(dt_joining);
now my code is using UNION ALL to get output as in table2 select col1,col1,'Segment1' col3,Segment1 col4 from table1 union all select col1,col1,'Segment2' col3,Segment2 from table1 union all select col1,col1,'Segment3' col3,Segment3 from table1
But the problem is the performance is realy bad.Is there any way i can do this without using union all? The time that take to execute this is not exceptable.
i am testing a proc after tuning it but the problem is, it is taking a very very less time which it shouldn't. I know that it is because of the buffer cache and the shared pool. that why i need to clean the cache to retest it.
I cannot bounce the database as other schemas are part of it. so is there any way to clean the cache for that particular schema i.e bouncing any particular schema(i know that the term is not appropriate).
I have the below cursor 1 which is working already.For my requirement i want to use bind variable like second cursor.But its telling Bind Variable "p_col_list" is NOT DECLARED.
How to use bind variable Here.
Cursor1: DECLARE emp_cv sys_refcursor; iid NUMBER := 1; i_sql varchar2(100); p_col_list varchar2(2000) := 'aaa,bbb,ccc,ddd'; BEGIN i_sql := 'select '''||REPLACE(p_col_list, ',', ''',''')||''' from dual '||CHR(10) ; dbms_output.put_line(i_sql); OPEN emp_cv FOR i_sql ; END;
Cursor2: DECLARE emp_cv sys_refcursor; iid NUMBER := 1; i_sql varchar2(100); p_col_list varchar2(2000) := 'aaa,bbb,ccc,ddd'; BEGIN i_sql := 'select '''||REPLACE(:p_col_list, ',', ''',''')||''' from dual '||CHR(10) ; dbms_output.put_line(i_sql); OPEN emp_cv FOR i_sql using p_col_list; END;
I am facing the same problem: SP2-0552: Bind variable "OLD" not declared. When my script create_trigger.sql is executed,there is no error but when i execute it inside a pl/sql block it get above error...In the trigger we are using if conditions
if(:new.sumthing=1)and (:old.sumthing=0)the do this..
Identical statements from this link : Parsing in Oracle — DatabaseJournal.com d. The bind variable types of the new statement should be of same type as the identified matching statement. i am getting confuse here .. when parsing occurs some links saying about bind variable.but official document never said about bind variables.
PLS-00049 BAD BIND VAIRABLE 'OLD.REMARKS' When i create or replace the following trigger
CREATE OR REPLACE TRIGGER T_TASKHISTORY AFTER UPDATE ON S_TASK FOR EACH ROW DECLARE BEGIN INSERT INTO S_TASKHIS (HIS_DATE,SUBJECT,DESP, SCHEDULED_DATE, SCHE_TIME ,USER_MOB_NO
- ProdPL/SQL Release 10.2.0.5.0 - ProductionCORE 10.2.0.5.0 ProductionTNS for Linux: Version 10.2.0.5.0 - ProductionNLSRTL Version 10.2.0.5.0 - Production.
I have a problem when creating a dynamic statement. The problem is in the bind variable ':OLD.CUST_NAME' ,..my question is is there an escape character to treat the bind variable as a literal string?
{code}v_str2 := '''CUST_NAMES='''||'||'|| ':OLD.CUST_NAME' ; EXECUTE IMMEDIATE 'create or replace trigger trg_' || SUBSTR (rec_cur.table_name, 1, 26) || ' before insert or update or delete on ' || rec_cur.owner || '.' || rec_cur.table_name || ' declare begin if UPDATING then FIFAPPS.ibug.log_errors('|| v_str2 ||' ); end if; end;';
{code}
I want the output in a trigger something like this:{code}
if UPDATING then FIFAPPS.ibug.log_errors('CUST_NAMES='||:OLD.CUST_NAME );{code}
I have two procedure , from first procedure having some ref cursor output.
from second procedure I need to call first procedure and i need to process ref cursor output from first procedure so I decide to use bind variable to process ref cursor output but it showing error .
can I define bind variable inside the procedure , then how can I define it .
SQL> CREATE OR REPLACE PROCEDURE emp_by_job ( 2 p_job VARCHAR2, 3 p_emp_refcur OUT SYS_REFCURSOR 4 ) 5 IS 6 BEGIN
The idea is to use some constant value in PL/SQL code with requirement to feed it to Oracle as value but not bind variable. Such constants used in multiple places in the code, so wants to declare it but from DB point of view it should be value. In my case Oracle will choose much better execution plan with real value for the table.
I tried to use constant, e.g: CODEdeclare const1 constant number := 1; beging
[Code].....
But in sqlarea it represented as: SELECT SUBSCRIBER_ID FROM SUBSCRIBERS WHERE STATUS = :B1
I have to use bind variable for dynamic sql in a procedure. Is there a way to have control on these values. Say for example:
Procedur MyProc ( In_EmpID Number default null, In_EmpName Varchar2 default null, in_JoinDate Date default null [code]....
I have more than 5 In parameters, all 5 is not compulsory by default they are null and sql formation is also dynamic with in the procedure.I need to map bind variable to a proper one.. Is there a way to handle bind variable.
I have developed a form based on a database of books. The information displayed during run time is Sr No, Book name,Author, Copies, Description and Image(of the book)
I have written a PL/SQL code to display the image of the respective book for every new record. E.g Book1 should display image1, book2 displays image2 and so on. This should happen at runtime. The code is:
declare gif_image varchar2(80):='c:ProjectBooks'; photo_filename varchar2(80); begin photo_filename := gif_image||lower(:books.sr_no)||'.gif'; [code].......
The error i get during compilation is
Error 49 at Line 5, column 37 bad bind variable 'books.sr_no'
Is it possible to bind collection while opening a ref cursor. Find below the code that I am trying. My goal is to open cursor once using collection variable. Can it be done using DBMS_SQL ?
DECLARE TYPE typ_emp_rec_in IS RECORD ( deptno NUMBER, sal NUMBER [code]......
I am working on a procedure which will insert a concatenated field that will have HTML code and a paramater value into a procedure. For some reason I am having issues inserting the HTML code into the local variable for process. I am not getting an error but instead the insert is not including the value in the variable when code when it runs. Do I need to enclose anything around the HTML to make this work?
This is an example of how I am populating the variable:
I am using Developer 10g R2. I have a form with two fields named input_value and output_value and a button named ok. I have a java class named Factorial which return the factorial of the input value. Now i want to use this class into pl/sql in ok button.
We are using sqlldr query to load data into a table. This is handled in a java code. We are uploading an xls file which gets converted into csv and then the sqlloader call works, which in turn creates a bad and log file for error messages.
But I am not able to locate the bad file(in filesystem) within java code.
Below piece of used.
File file =new File(destfilePath); if(file.exists()){ FileReader fr = new FileReader(file); LineNumberReader lnr = new LineNumberReader(fr); linenumber=0;
[code]....
The above code is able to locate CSV ,but not the bad file(whereas both files created in same path).
Looking to understand the difference between instance tuning and database tuning.
What is the difference between these two tuning exercises? I understand that an instance is memory based structures (logical) where as database consists of physical structures.
However, how does one tune a database the physical structure? Does it have to do with file placements/block sizes etc. Would you agree that a lot of that is taken care by ASM now in 11g? What tools are required/available (third party as well as oracle supplied) for these types of tuning scenarios?
I would like to add another filed into the Employee Self Service page (OAF) Expense claim portion.Basically the field would require to grab an existing GL account code based on the element link setup from expense element.
The main point to add this additional field is to capture the expenses type and displaying its GL account code based on element link account code setup.
