Histograms and bind variables

Similar Questions

• literal and bind variables

  Hello
  
  What is the difference between literal and bind variables?
  What happens if I use
  literal variable has.
  variable b.bind
  
  who is suggested?
  
  Kind regards
  KKK

  There are two phases of any SQL performance.

  1. analysis (check Oracle this SQL syntax, also generates the implementation PLAN)
  2. execution (the real execution takes place)

  Below, SQL.

  Select * from emp where empno = 1234;

  I used literal in the SQL above.

  For each SQL type similar (average for empno modified value) oracle must analyze the SQL for each performance.

  Select * from emp where empno =: v_emp_no;

  I used the bind variable in the SQL above.

  In the oracle SQL above needs to analyze once, next time ehen this SQl will be executde with the value of the bound different variable, oracle will use the old execution PLAN and analysis will be not not happed. It will be a little fast.

  Also variable binding instead of literal use reduced use shared pool.

  HTH

  Best regards
  oratest

• See criteria and bind variables

  Greetings experts,

  I use JDev, version: 11.1.2.3.0

  Recently, I came across this situation. I created a variable binding (in VO), which is used inside a criterion for the VO even. This criterion to display is called within a method that is declared within a class of java of implementation of AppModule (which is exposed on the Client Instance), and through a managed bean I supply the parameter required to initialize the variable binding (and then get the results). This works fine, and the page that uses the domain controller for this appmodule runs without error.

  The point is that I have the same VO, used inside an another appModule (and another page uses, it's DC). I need to use this variable binding in this case, but if I click edit on this VO second, inside the second presentation of appModule interface, I can see that the criteria for the view, is in the "Available" tab, but in the section 'Setting bind' it shows the binding variable said first.

  I am as a matter of fact, receiving and error on this second page if I do some operations, saying this:

  Caused by: java.sql.SQLException: try to set a parameter name that does not intervene in the SQL: partyNum

  at oracle.jdbc.driver.OraclePreparedStatement.setNullAtName(OraclePreparedStatement.java:5384)

  at oracle.jdbc.driver.OraclePreparedStatementWrapper.setNullAtName(OraclePreparedStatementWrapper.java:1451)

  at oracle.jbo.server.OracleSQLBuilderImpl.bindParamValue(OracleSQLBuilderImpl.java:4695)

  at oracle.jbo.server.BaseSQLBuilderImpl.bindParametersForStmt(BaseSQLBuilderImpl.java:3673)

  at oracle.jbo.server.ViewObjectImpl.bindParametersForCollection(ViewObjectImpl.java:21459)

  at oracle.jbo.server.QueryCollection.buildResultSet(QueryCollection.java:1197)

  SQL error in the preparation of the statement.  Instruction: SELECT PartiesContracts.CONTRACT_IDCONTRACT, PartiesContracts.PARTY_TYPE, PartiesContracts.PARTY_NUM, PartiesContracts.ROLE PARTIES_CONTRACTS PartiesContracts WHERE PartiesContracts.CONTRACT_IDCONTRACT =: Bind_Idcontract

  (The binding variable is called, partyNum)

  My question is, can I do to avoid using this variable to link on the second page of appModule only? It seems to be called always regardless the fact if I call the appropriate support bean method that triggers the initialization process.

  Thank you for your time.

  Have you defined the binding variable 'partyNum' as requires it? In this case, you need to specify every time. You can set the variable as not mandatory and it might work.

  The solution would be to set another VO with the same base, without the "partyNum" bind variable and VC and use in the other AM.

  Timo

• Immediate execution, to update and bind Variables

  I can't EXECUTE IMMEDIATE to work with an update statement when trying to link the name of the table. Consider the following example:
  

  create table gr_test(
    n Number);
    
  insert into gr_test (n) values(1);

  The anonymous block under works:
  

  declare
    update_statement Varchar2(2000);
  begin
    update_statement := '
    update gr_test
       set n = 2';
  
    execute immediate update_statement;
  end;

  but not
  

  declare
    update_statement Varchar2(2000);
  begin
    update_statement := '
    update :table_name
       set n = 2';
       
    execute immediate update_statement
      using 'gr_test';
  end;

  It gives ORA-00903 - invalid table name.

  You can not link the names of tables/columns using the clause Bind Variables (USING).

  You need to add to the dynamic SQL.

  Something this way:

   declare
     update_statement Varchar2(2000);
     v_table_name        varchar2(30);
   begin
     v_table_name = 'GR_TEST';
     update_statement := '
     update ' || v_table_name || '
        set n = 2';
  
     execute immediate update_statement;
   end;
   
  

  For more information about the Execute Immediate, please read execute immediate statement.
  For Dynamics, reading SQL statements dynamic SQL Oracle 11 g.

• Ask about bind variables and LOVs

  Hello
  I'm new to ADF. Last day, I learned about LOVS, see criteria and bind variables. Now, I tried to develop a sample application. I created a few EOs, village and an AM.
  I also defined a view criteria which takes as a parameter a variable binding and rule the condition when running. Then, I created a group of query based on my view criteria. In this query Panel, when I enter the name of a student in a box (which is related to the binding variable that I guess), the student information is displayed in a table. Now, instead of an entry box, I want a list of choices based on a LOV-driven model that will contain all the names of students available. Is this possible in ADF 11 g?
  
  Thanks in advance

  You must open the VO, you use, go to the view whole section and in the view whole section go in the attributes section.

  In attributes, select the attribute by which you are to the search or make your operation, click on the button add to the list of values: the name of the attribute

  Select the vo object to fill the value.

  You will get the data in the variable binding, that you created in the view criteria.

  Reporter, you can follow the bolg

  http://saumoinak.blogspot.com/2011/02/showing-data-based-on-list-of-values.html

• printing problem in pdf and csv using bind variables

  Hello
  
  I created a simple sql statement using a query and bind variables. I noticed when I remove the bind variables and hardcode the values that the CSV/PDF links work. When I handed the return variables in the query, the WB shows "no data found" and pdf shows only the column header.
  
  If anyone can help me, I would be very happy!
  
  
  Thank you
  Ayed P.

  Hello

  How are set the bind variable? If there are topics evaluated by default on the elements of the page, so is not necessarily enough to ensure that the exports are their values. To set values, I tend to use calculations, conditional that the element is null, what works "Before Header". In this way, the value is stored in the session and is available for export. I think the defaults to be those that are defined when the page is submitted and are not available until now.

  Andy

• Ensure this soft analysis the use of Bind variables

  Hi Experts,
  
  I have a request when the query is prepared dynamically in Java code and if I take the query and run it from SQL Navigator, it takes a long time to prepare the statement and then execute it quickly. I think we can use dynamic SQL statements and bind variable to improve performance here. However, I tried to do a PDS to check my understanding. I created 2 procedures
  
  1. mode of operation

  CREATE OR REPLACE PROCEDURE sp_static
  (id IN NUMBER, 
   name in VARCHAR2)
  IS 
  TYPE r_curs_type is REF CURSOR;
  C1 r_curs_type;
  BEGIN
  
  OPEN C1
  FOR
  SELECT * FROM TABLE WHERE columname = id
  
  CLOSE C1;
  
  END;

  2. mode of operation

  CREATE PROCEDURE sp_dyanmic
  (id IN NUMBER, 
   name in VARCHAR2)
  IS 
  TYPE r_curs_type is REF CURSOR;
  C1 r_curs_type;
  BEGIN
  
  OPEN C1 FOR 'SELECT * FROM TABLE WHERE columnanme = :U1' 
  USING ID;
  
  CLOSE C1;
  END;

  To my amazement, there is no difference in the duration of execution of these procedures when I ran the with multiple entries.
  
  Please note-
  1. I have not access to trace files :-(
  2. I want to just make sure there will be improved performance before starting the real work, given that some efforts provided by moving the logic of all its activities inside and the use of bind variables.
  
  If you can suggest a strategy to ensure performance gains, it will be extremely useful...
  
  Thanks in advance!
  Concerning

  Hello

  (1) it's true, procedure 1 also uses a variable binding
  (2) you seem to be confused about the very basic concepts here

  Dynamic SQL is something like this:

  create or replace FUNCTION f (l_table_name VARCHAR2) RETURN NUMBER
  IS
    l_result NUMBER;
  BEGIN
    EXECUTE IMMEDIATE 'SELECT COUNT(*) FROM ' || l_table_name  INTO l_result;
    return l_result;
  END;
  

  In this example, since you do not know the name of the table to the execution table, everything you can
  is dynamic SQL. As you can see, neither of your two procedures is like that.

  Dynamic SQL is used when you do not know what columns you want to select, or who
  etc. to the execution table. You can also use dynamic SQL statements to force analysis. You can not use
  to avoid parsing, binding or not binding.

  Best regards
  Nikolai

• The use of bind variables in dynamic query created for Ref Cursor

  Hello
  
  I'm in a situation where there is a Ref cursor to which the query is built execution based on a loop. This is why the number of links would be known until the program runs.
  The application is currently using literals instead of bind variables.
  
  code snippet of the above is
  strSql: = "select * from emp where 1 = 1 and ().
  
  loop cursor1
  If cond is true then
  strSql = strSql | "ename = ' |" Cursor1.ColumnName;
  end loop;
  
  Open cursor2 for strSql;
  
  How to use links in the example above.

  sb92075 wrote:

  user13019948 wrote:
  Hello

  Here is the code I have my trying to change literal-based link to the base.

  What do you mean by "based bind?

  who, what, how determines the values to be 'bound '?

  He's referring to the coding style. He is currently using concatenated literal, and the goal is to change it to use the bindings.

  If I understand this it is known as method 4 dynamic SQL and requires DBMS_SQL. There are examples autour but they vary according to the type of statement being generated - SELECT statements require column lists to be parsed, unlike the INSERT/UPDATE/DELETE.

  This came up recently on my current project and I hit a demo. Here a table of names and values accepted procedure and had to build these in a single WHERE clause along the lines of

  AND t_names(i) = t_values(i)
  

  for an undetermined number of elements in the array. For this demonstration, I used a table that we called "attribute" (don't ask) which has columns including 'attribute_id' and 'name', and I need to build a query along the lines of

  select description from attribute where attribute_id = :b1 and name = :b2
  

  by the way '1012' and 'ISIN' respectively. (I use a table better and after a CREATE statement for her but I have to rush right now, sorry).

  declare
     k_sql_base        constant varchar2(500) := 'select description from attribute';
  
     t_names           constant varchar2_t := varchar2_t('attribute_id',  'name');
     t_values          constant varchar2_t := varchar2_t('1012',          'ISIN');
  
     l_sql             varchar2(500) := k_sql_base;
     l_rows_fetched    integer := 0;
     l_value           varchar2(4000);
  
     l_cursor_handle   integer;
  
  begin
     -- Construct the SQL statement with column names and bind variables e.g.
     -- 'select description from mars.attribute where attribute_id = :b1 and name = :b2'
     for i in t_names.first .. t_names.last loop
        l_sql := l_sql ||
           case i
              when t_names.first then ' where ' else ' and '
           end ||
           t_names(i) || ' = :b' || i;
     end loop;
  
     dbms_output.put_line('SQL statment = ' || l_sql); 
  
     -- Parse the statement we built above (the remaining steps require a parsed cursor):
     l_cursor_handle := dbms_sql.open_cursor;
     dbms_sql.parse(l_cursor_handle, l_sql, dbms_sql.native);
  
     -- Associate the 1st column of output with variable l_value - required for SELECT statements:
     -- (actually the 3rd param here 'column' seems to be only used to get a datatype, in this case we want a string -
     -- dbms_sql.column_value actually extracts the value into a specified variable, which can be different.
     -- All examples in the documentation pass a local variable without further comment, so not entirely clear what this does other than set the output datatype.)
     dbms_sql.define_column(l_cursor_handle, 1, l_value, 4000);
  
     -- Now go through values array binding actual values to :bn variables in the cursor (similar to USING clause of EXECUTE IMMEDIATE)
     for i in t_values.first .. t_values.last loop
        dbms_sql.bind_variable(l_cursor_handle, ':b'||i, t_values(i));
        dbms_output.put_line('Bound :b'||i || ' as ' || t_values(i));
     end loop;
  
     -- Open the cursor and fetch the result (no loop here because we are expecting a single-row result):
     l_rows_fetched := dbms_sql.execute_and_fetch(l_cursor_handle);
  
     -- 'Returns value of the cursor element for a given position in a cursor'
     -- Copy the value of column 1 to variable l_value (has to match
     -- dbms_sql.column_value(l_cursor_handle, 1, l_value);
     dbms_sql.column_value(l_cursor_handle, 1, l_value);
  
     dbms_output.put_line('Result = ''' || l_value || '''');
  
     dbms_sql.close_cursor(l_cursor_handle);
  end;
  

  Hope that helps...

• A query on bind variables

  Hello
  
  I have a procedure that takes the deptno parameter and inserts that records departments of the table emp for the new table.
  
  This code does not exist in a real system. I was trying to understand that the advantage of linking variable.i he wrote in different ways as below
  

  Create table emp3 as select * from emp where 1=2;
  
  create or replace procedure test1 (p_deptno in number)as 
  begin
   execute immediate 'insert into emp3
                                 select *
                                 from emp
                                 where deptno=:1'
                                 using p_deptno;
  end;

  The works fine.i code above writes the following much too.
  
  

  create or replace procedure test2 (p_deptno in number)as 
  begin
   insert into emp3
        select *
        from emp
        where deptno=p_deptno;
  end;

  the first no matter what performance benefit over the second one that is the right way to do it in a real-world system?
  . I could not do a comparison of performance because I don't have access to a currently oracle instance and did it in workshop SQL that comes with Apex.My apology for this...
  
  Kind regards
  CKLP
  
  Published by: CKLP on August 29, 2011 03:21

  CKLP wrote:

  the first no matter what performance benefit over the second one that is the right way to do it in a real-world system?

  Not really. Do not forget that all interpreted SQLs winds up as sliders to the sharing of the database Pool.

  If a cursor exists already for a SQL statement, SQL will reuse this slider existing (soft parser). So in a SQL engine perspective, there is no different between the two methods. These statements will be btw generate the same cursor SQL - code SQL of base and bind variable positions are identical.

  From a PL/SQL's point of view, there is a huge difference.

  The first option may be a little slower. Why? There he uses the immediate execution interface which is not as optimized as the implicit cursor to the PL/SQL interface. You use a "heavier" SQL interface in PL/SQL which results in more work for the PL/SQL engine.

  The second option is compiled in an implicit cursor. The SQL code is known, controlled and checked, and compiled PL/SQL code deals with a known SQL statement. Unlike the first option.

  The second option also means that your code will not fail (because SQL syntax errors, etc.) currently running. If this static SQL statement in your code is no longer valid (due to a table being deleted, used column removed, etc.), then your code becomes invalid. With the first option, the code remains valid - and when it is executed, it will throw an exception that the (dynamic) SQL cannot be analyzed and that it is not valid.

  The first option also introduces the spectrum of a SQL injection. Let's say that there is a way to cause a buffer overflow exploit in the database call that executes this procedure. The SQL itself is a string, it is an easy attack vector as the overflow needs that data of type string to inject executable code - as opposed to the p-code or machine code. (an unlikely scenario, but the basic principle of security remains true)

  Dynamic SQL is unnecessary for 99% of the time in PL/SQL. And 99% of the time, with the help of the dynamic SQL is for the wrong reasons, or ignorance or both.

• EO base extension VO with bind variables and display - How To link

  Hello

  I extended an APInvDistAllVO view object by adding two fields which are functions. Basically, in the invoice approval screen, I want to add two fields where the distribution of the invoice is shown.

  The SQL contained in jdeveloper when you extend the VO object is different from the query, what I see in the invoice approval page by clicking on the APInvDistAllVO link. There are two bind variable: 1 = invoice_id and: 2 = line_number being added dynamically. After the extension of the view object, the invoice distribution line is displayed as no record found.

  In my opinion, it is due to not having bind variables does not correct parameters being passed, and under this point of view object is an object depending on the invoice header record. There is a link to the original View object as well. Will be very grateful if someone can provide the way forward in dealing with this situation.

  Rgds Fahad

  Hi AJ

  He worked after changing the style of bind.

  Thank you very much.

  Rgds

  Fahad

• Bind variables and dates

  I am writing a process to delete records based on dates.

  Here is the chart:

  Column name	Data type	Nullable	Default	Primary key
  ID	NUMBER	NO.	-	1
  CT_NAME	VARCHAR2 (100)	Yes	-	-
  CT_CATEGORY	VARCHAR2 (100)	Yes	-	-
  BASE_PTS	NUMBER	Yes	-	-
  PROD_PTS	NUMBER	Yes	-	-
  REF_PTS	NUMBER	Yes	-	-
  START_DATE	DATE	Yes	-	-
  END_DATE	DATE	Yes	-	-
  CREATED_ON	DATE	Yes	-	-
  CREATED_BY	VARCHAR2 (50)	Yes	-	-
  UPDATED_ON	DATE	Yes	-	-
  UPDATED_BY	VARCHAR2 (50)	Yes	-	-

  start_date and end_date are the fields of date key.

  The query will remove the dates with specific start and end dates.  The question I have, is that I get a ORA-01858: a non-digit character was found here where was waiting for a digital error while the query is running.

  remove from ct_point_values

  where start_date =: P4_START_DATE_V

  and end_date =: P4_END_DATE_V

  If I run the query in the sql window, no problem:

  remove from ct_point_values

  where start_date =' 01 / 01/2014 '

  and end_date = 31 December 2014"

  Find the query with the works of values hard-coded.  Links to fail.  I tried casting and to_char to_date variations with no luck.

  One thing that I notice, is that when I go to enter my bind variables in the sql workshop, the fields are pre-populated with this:

  1 & amp; #x2F 1 & amp; #x2F; 2014

  12 & amp; #x2F 31 & amp; #x2F; 2014

  01/01/2014 and 31/12/2014.  I found that the only element relates to this suggests that this is a possible bug:

  SQL Bind Variables workshop - Date issues

  Any thoughts on how to address this issue, or is it really a bug?

  I run on Apex 4.2, 11g.

  Thank you!

  Hello

  I guess that these dates come from elements on the page to which the user can select a range of dates.

  These fields have a custom format mask?

  What seems to be the case for me, is that these fields have an explicit format mask (for example: DD/MM/YYYY) but the default database/session format mask is something different (e.g. DD-MON-YYYY).

  I suppose also that the issue in the SQL workshop isn't something related.

• Bind Variables and using the keyword

  In my dynamic SQL, I use the same variable in several places in my query. Is there a way to avoid rewriting the same value multiple times in the list of arguments to bind? It is something like that - only pseudo code.
  

  DECLARE
  tSQL VARCHAR2(99)
  pVal INT := 2;
  
  BEGIN
  tSQL := 
             'SELECT * ' ||
             '  FROM dual ' ||
             ' WHERE col1 =: iVal ' ||
             '   AND col2 IN (SELECT col2 ' ||
             '                  FROM dual  ' ||
             '                 WHERE col1 =: iVal) ' ||
             ' UNION ' ||
             ' SELECT * ' ||
             '   FROM dual ' ||
             '  WHERE col1 =: iVal';
  
  EXECUTE IMMEDIATE tSQL 
  USING pVal, pVal, pVal;  -- Is there a way to avoid having to rewrite the same bind variable argument three times since the value is the same?
  
  END;

  Is there a way to avoid having to rewrite the same argument three times bind variable as the value is the same?

  Etbin wrote:
  http://docs.Oracle.com/CD/E11882_01/AppDev.112/e25519/dynamic.htm#BHCHIHEJ says:
  Placeholders are associated with bind variable in the USING clause of position, and not by name.

  Concerning

  Etbin

  The exception to this rule is if the SQL statement is an anonymous block or a call statement. In this case, the repetition of the names of the placeholder is significant.

  http://docs.Oracle.com/CD/E11882_01/AppDev.112/e25519/dynamic.htm#CHDFHEAG

  For example, the following will fail with ORA-01008: not all variables

  declare
   v_cnt number;
  begin
    execute immediate 'select count(*) from dual where 1 = :B1 and 2 > :B1'
    into v_cnt using 1;
    dbms_output.put_line(v_cnt);
  end;
  

  However, the following will succeed because the SQL code is in fact an anonymous block:

  begin
    execute immediate 'declare
                         v_cnt number;
                       begin
                         select count(*)
                         into v_cnt
                         from dual
                         where 1 = :B1 and 2 > :B1;
                         dbms_output.put_line(v_cnt);
                       end;'
    using 1;
  end;
  

  Pretty cool stuff.

• Link to ' effective use of bind variables, cursor_sharing and related ' KO

  If I try to access to "the effective use of the bind variables, cursor_sharing and parameters related cursor" doc with link http://www.oracle.com/technetwork/database/features/performance/whitepapers-098560.html http://www.oracle.com/technology/deploy/performance/pdf/cursor.pdf I get
  
  >
  We're sorry, the page you requested was not found.
  We recorded this error (404) to help us solve the problem.
  You can try again using one of the tools below.
  Back to previous Page
  Site map
  Index of products
  To find your page, try our search function.
  Refine your search

  This PDF file does not exist if the link has been deleted.

• bind variables and dynamic sql

  Hi all
  
  Here's my situation:
  
  I have a query with 2 bind variable: the FROM clause also uses a variable binding!
  
  

  PROCEDURE describe_columns(p_curr_tablename VARCHAR(50), p_curr_intentseq NUMBER)
     IS
        l_cur     INTEGER;
        l_query   VARCHAR (100);
     BEGIN
        l_query :=
           'select * from :table_name where ibmsnap_intentseq = :sequencenr';
        l_cur := DBMS_SQL.OPEN_CURSOR;
        DBMS_OUTPUT.PUT_LINE (p_curr_tablename);
        DBMS_OUTPUT.PUT_LINE (p_curr_intentseq);
        DBMS_OUTPUT.PUT_LINE (l_query);
        DBMS_SQL.PARSE (l_cur, l_query, DBMS_SQL.V7);
        DBMS_SQL.bind_variable (l_cur, ':table_name', p_curr_tablename);
        DBMS_SQL.bind_variable (l_cur, ':sequencenr', p_curr_intentseq);
        DBMS_SQL.DESCRIBE_COLUMNS (l_cur, g_count, g_desc_tab);
        DBMS_SQL.CLOSE_CURSOR (l_cur);
     EXCEPTION
        WHEN OTHERS
        THEN
           DBMS_OUTPUT.put_line ('DF-EXCEPTION: ' || SQLERRM);
           DBMS_OUTPUT.put_line (
              'DF-EXCEPTION: ' || DBMS_UTILITY.FORMAT_ERROR_BACKTRACE
           );
  
           IF DBMS_SQL.IS_OPEN (l_cur)
           THEN
              DBMS_SQL.CLOSE_CURSOR (l_cur);
           END IF;
     --         RAISE;
     END;

  and the output is:
  

  CD_B136V4_NEW
  16
   select * from :table_name where ibmsnap_intentseq = :intentseq
  DF-EXCEPTION: ORA-00903: invalid table name
  DF-EXCEPTION: ORA-06512: in "SYS.DBMS_SYS_SQL", line 906

  So is the problem that I want to use a variable binding for the name of the table?
  
  I'd appreciate any help!
  Thank you!

  http://asktom.Oracle.com/pls/asktom/f?p=100:11:0:P11_QUESTION_ID:227413938857

  Identifiers cannot be used as variable bind - never. Identifiers must be "hard-coded".
  in the query.

  I can't put in a link for "emp" variable because I can't use a string
  constant for emp.

  The reason is quite simple - a bind variable query is parsed and optimized once
  variables are evaluated before linking. If I could code:

  Select * from: bind_x

  the optimzer would not have an idea of what will come with, security (access rights)
  could be evaluated and so on. We could not develop a plan for this query - not
  enough information. Therefore, no variable bind for identifiers.

• bind variables and v$ sqlarea

  Hello
  
  How to distinguish the variable bind to static expression
  in v$ sqlarea? Is this possible?
  Please explain
  
  Best regards
  Paul

  Hello

  You acknowledge that bind variable by ':' in front, you cannot merge with literals.

  Best regards
  Nikolai