Bind variables in DB Connect SQL Statement in Oracle

We are looking for ways to improve performance of DB Connect extract from an Oracle database.
An example command that is created by the Info-Package using a DB-Connect:
Current
SELECT "A", "B", "C", "D", "E", "F", "G", "H"
FROM "GSF_BW"."V_BW_FORCAST_FACT"
WHERE ("A" = '200904') AND ("B" BETWEEN '100801' AND '101412')
The calculated cost (calculated by Oracle Optimizer) is 25.145
Oracle recommends the usage of bind-variables.
In that case the Statement would need to look like:
SELECT "A", "B", "C", "D", "E", "F", "G", "H"
FROM "GSF_BW"."V_BW_FORCAST_FACT"
WHERE ("PG0R_SUBD" = :b1) AND ("ZCALMONTH" BETWEEN :b2 AND :b3)
This would reduce the cost to 11.000 which is 40% of the statement before.
My question now is: Can anything be done to influence the generation of the SQL statement to make it better performing?

Hi,
It is always better to test yourself. Using bind variable is always a good practice and optimizer avoids hard parsing (soft parsing will be done here) if bind variables are used.
So yes, if this function is being executed several times frequently then second execution onwards it may run faster.
If you want to see actually what is happening behind it, trace it (using tkprof) and see the result.
See the below link to know more about SQL TRACE and tkprof.
http://download.oracle.com/docs/cd/E11882_01/server.112/e16638/sqltrace.htm#PFGRF01020
Regards,
Avinash
Edited by: Avinash Tripathi on Nov 16, 2010 11:46 PM

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===============================
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at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:170)
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at com.o2.morse.scheduler.EndOfDay$$FastClassByCGLIB$$3b2d4927.invoke(<generated>)
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at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:170)
at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:643)
at com.o2.morse.scheduler.EndOfDay$$EnhancerByCGLIB$$488a9f86.run(<generated>)
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at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
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at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1049)
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at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1154)
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at java.lang.reflect.Method.invoke(Method.java:585)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:287)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:181)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:148)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:170)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:176)
at $Proxy3.batchLoad(Unknown Source)
at com.o2.morse.domain.User.doHousekeeping(User.java:667)
at com.o2.morse.domain.User$$FastClassByCGLIB$$372ff70b.invoke(<generated>)
at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:705)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:148)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:170)
at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:643)
at com.o2.morse.domain.User$$EnhancerByCGLIB$$d5ac966a.doHousekeeping(<generated>)
at com.o2.morse.scheduler.EndOfDay.run(EndOfDay.java:63)
at com.o2.morse.scheduler.EndOfDay$$FastClassByCGLIB$$3b2d4927.invoke(<generated>)
at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:705)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:148)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:170)
at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:643)
at com.o2.morse.scheduler.EndOfDay$$EnhancerByCGLIB$$488a9f86.run(<generated>)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.springframework.util.MethodInvoker.invoke(MethodInvoker.java:248)
at org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean$MethodInvokingJob.executeInternal(MethodInvokingJobDetailFactoryBean.java:165)
at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:90)
at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:525)
Batch Job Failed: org.springframework.transaction.TransactionSystemException: Could not roll back JDBC transaction; nested exception is java.sql.SQLException: Closed Connection

I am using latest Jrockit 16)5, ojdbc6_g.jar,spring.jar Weblogic 10.3 and Oracle 10G 10.2.4 .. whatever but always get "Closed Connection"
java.lang.Throwable: Closed Connection
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:146)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:208)
at oracle.jdbc.driver.PhysicalConnection.createStatement(PhysicalConnection.java:750)
at oracle.jdbc.OracleConnectionWrapper.createStatement(OracleConnectionWrapper.java:183)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:7053)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3902)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2773)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:224)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:183)

Using bind variables in additional pl/sql code

How do you retrieve the a bind variable in the addition pl/sql
code portion of the report wizard?
I try something like
declare
v_test varchar2(40);
begin
select lastname into v_test from wvgsemp
where username = :binduser;
htp.bold('Report generated by:
'||v_test);
end;
but it say PLS-00049: bad bind variable 'BINDUSER'
However this is exactly the way I declared it in step one
of the wizard?

Hi,
You cannot have bind variables in additional plsql code.
Thanks,
Sharmila

ORA-01006 Using Bind Variables In A Dynamic SQL Contains Query

I have the following dynamic SQL query :-
declare
TYPE typ_sql IS REF CURSOR;
ltyp_sql typ_sql;
lv_sql VARCHAR2(100);
begin
lv_sql := 'SELECT arx_id FROM arx WHERE CONTAINS ';
lv_sql := lv_sql || (arx_full,''(:b1) WITHIN ui'') > 0';
open ltyp_sql FOR v_sql USING ln_id;
fetch ......
close ......
end;
When the code tries to open the cursor it gives the above error. I presume it is the way Oracle is expanding the bind variable but I cannot find anything in the docs to say why this is happening or whether you can do this or not using bind variables ( CONTAINS query ). Any help would be appreciated, thanks,
Stuart.

lv_sql || '(arx_full, :b1 || '' within ui'') > 0';

Substitution variables by executing a SQL statement

If there is a "&text" in a SQL Statement, then SQLDEV automatically interprets this as an "substitution variable" and pops-up a box for entering the values of the variable(s) or takes the value of the "define myvariable myvalue;" statement. How can I turn this feature off? Is there a preference or a SQL-Plus Statement, so that SQLDEV ignores the "&variables"?
Cause: I have to run some (large) SQL-skripts, which contain some "&text", which should NOT be interpreted as substitution variables.

SET DEFINE OFF
SS

How to check parsing and binding of procedure's inner sql statements

Hi,
I want to check, how all variables binding gets done for the sqls used in procedure.
Is there any dictionary table or way to get it?
Thanks in Advance.

939517 wrote:
Hi,
I want to check, how all variables binding gets done for the sqls used in procedure.
Is there any dictionary table or way to get it?
Thanks in Advance.query one of the views below
SQL> select view_name from dba_views where view_name like '%BIND%';
VIEW_NAME
V_$SQL_BIND_CAPTURE
V_$SQL_BIND_DATA
V_$SQL_BIND_METADATA
DBA_OPBINDINGS
USER_OPBINDINGS
USER_SQLSET_BINDS
USER_SQLTUNE_BINDS
ALL_OPBINDINGS
DBA_HIST_SQLBIND
DBA_HIST_SQL_BIND_METADATA
DBA_SQLSET_BINDS
VIEW_NAME
DBA_SQLTUNE_BINDS
KU$_LOBINDEX_VIEW
KU$_OPBINDING_VIEW
ALL_SQLSET_BINDS
GV_$SQL_BIND_CAPTURE
GV_$SQL_BIND_DATA
GV_$SQL_BIND_METADATA
18 rows selected.

Using a string variable as a query SQL statement

I want to construct a custom SQL statement in a string var, then use that var in the cfquery statement. What is the proper syntax? Here is my feeble attempt:
<cffunction ...>
<cfset var sql_txt="">
        <cfquery name="qSBJs" datasource="cfBAA_odbc">
            "#sql_txt#"
        </cfquery>
    <cfreturn qSBJs>
I've tried using no " or # or just # or just " but nothing works.
what about:
        <cfquery name="qSBJs" datasource="cfBAA_odbc" sql="#sql_txt#">
        </cfquery>
nope. I wish there was a sql property I could fill *before* the execution of the query. Any suggestions?

Hi Adam, and/or anyone who may have a few minutes to check this... I got the following code to work. It calls the getSBJs function from Flash Builder 4. I get the correct result set back. Long table names are replaced with short abreviations. Note that some local vars are declared but not used in the following example. I will use them in the future versions of this same code. Since I will in the future, like a donkey, mindlessly use this same method for all my queries, it would be much appreciated if I could get a guru to check this code for:
-Pure idiocy
-Mild insanity
-SQL injection vulnerability
-Memory leakage
-Scope dangers
(ignore emoticons, see the underlying text)
    <cffunction name="AbrvTblNms" output="false" returntype="string" >
        <cfargument name="txt" type="string" required="true" />
        <cfset var qAbrvs="">
        <cfset var output_str="#ARGUMENTS.txt#">
        <cfquery name="qAbrvs" datasource="cfBAA_odbc" result="rsltAbrvs">
            SELECT TBL_NM, ABRV FROM BAA_TBL_ABRV ORDER BY 1
        </cfquery>
    <cfloop query="qAbrvs">
            <cfset output_str = Replace(output_str, '[' & qAbrvs.TBL_NM & ']', qAbrvs.ABRV, "ALL")>
    </cfloop>
        <cfreturn output_str>
    </cffunction>
    
    <cffunction name="getSBJs" output="false" access="remote" returntype="any" >
        <cfargument name="srch_val" type="string" required="true" />
        <cfset var qSBJs="">
        <cfset var sql_txt="">
        <cfset var whr="">
        <cfset var b=False>
        <cfset var in_txt="">
        <cfset var fm_dt="">
        <cfset var to_dt="">
        <cfset var on_dt="">
        <cfset var pht="">
        <cfset var srch_str="">
        <cfset var srch_trm="">
        
        <cfset srch_str = "#ARGUMENTS.srch_val#">
        
        <cfif Not (Len(srch_str))>
            <cfset srch_str = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX">
        </cfif>
        <cfset srch_trm = "#srch_str#">
        <cfset sql_txt =
            "SELECT DISTINCT
              [BAA_SBJ].SRC_SYS_NM, [BAA_SBJ].SRC_SYS_GUID, [BAA_SBJ].OBJ_GUID, [BAA_SBJ].SBJ_NM, [BAA_SBJ].SBJ_DOB, [BAA_SBJ].SBJ_ID, [BAA_SBJ].NOTE, [BAA_SBJ].CDT, [BAA_SBJ].CTM, [BAA_SBJ].CBY, [BAA_SBJ].MDT, [BAA_SBJ].MTM, [BAA_SBJ].MBY
            FROM
              BAA_SBJ [BAA_SBJ]
              LEFT JOIN BAA_SES [BAA_SES] ON [BAA_SES].PAR_GUID = [BAA_SBJ].OBJ_GUID
              LEFT JOIN BAA_IMG [BAA_IMG] ON [BAA_IMG].PAR_GUID = [BAA_SES].OBJ_GUID
            WHERE [WHERE_CLAUSE] ORDER BY [BAA_SBJ].SBJ_NM">
        <cfset whr = "([BAA_SBJ].SBJ_NM CONTAINING TRIM( rm_srch_trm1 ) OR " &
                "[BAA_SBJ].NOTE CONTAINING TRIM(:prm_srch_trm2 ) OR " &
                "[BAA_SBJ].SBJ_DOB CONTAINING TRIM(:prm_srch_trm3 ) OR " &
                "[BAA_SES].SES_TYP CONTAINING TRIM(:prm_srch_trm4 ) OR " &
                "[BAA_SES].NOTE CONTAINING TRIM(:prm_srch_trm5 ) OR " &
                "[BAA_IMG].NOTE CONTAINING TRIM(:prm_srch_trm6 ))">
        <cfset sql_txt = Replace(sql_txt,"[WHERE_CLAUSE]", "#whr#", "ALL")>
        <cfset sql_txt = AbrvTblNms(sql_txt)>
    
        <cfscript>
        queryService = new query();
        queryService.setDatasource("cfBAA_odbc");
        queryService.setName("qSBJs");
        queryService.setAttributes(sql="#sql_txt#");
        queryService.addParam(name="prm_srch_trm1", value="#srch_trm#", cfsqltype="VARCHAR");
        queryService.addParam(name="prm_srch_trm2", value="#srch_trm#", cfsqltype="VARCHAR");
        queryService.addParam(name="prm_srch_trm3", value="#srch_trm#", cfsqltype="VARCHAR");
        queryService.addParam(name="prm_srch_trm4", value="#srch_trm#", cfsqltype="VARCHAR");
        queryService.addParam(name="prm_srch_trm5", value="#srch_trm#", cfsqltype="VARCHAR");
        queryService.addParam(name="prm_srch_trm6", value="#srch_trm#", cfsqltype="VARCHAR");
        result = queryService.execute();
        qSBJs = result.getResult();
        </cfscript>
        
        <cfreturn qSBJs>
    </cffunction>
THANKS TO ADAM AND DAN FOR HELPIMG ME GET THIS FAR! Now, don't let me embarass you by doing something dum and giving you "credit", if you see me doing something dum above. Thanks!

Binding variables in jDeveloper's SQL Worksheet

I try to execute something like this is SQL Worksheet:
variable myVar varchar2(10);
execute :myVar:='ok';
print :myVar;
I get ORA-00900: invalid SQL statement. In SQL plus this works just fine.
Do I do something wrong or SQL Worksheet doesnot support full SQL specification?

Hi,
yes, this is a bug.
It is fixed in JDeveloper 11 already. Because JDeveloper 11 is not yet production, if you do lots of PLSQL programming then you may want to have a look at SQL Developer, which is free of charge and does support your usecase in its current version. SQL Developer also provides the PLSQL development environment in JDeveloper 11
Frank

Bind variables in static pl/sql

Hi everyone.
Does this function will works faster than function below w/o binding? (I mean if it called very often, and execution plan is in cache)
FUNCTION get_amployee_name (empid INTEGER, empcity VARCHAR2) RETURN VARCHAR2 IS
    TYPE GenericCursor IS REF CURSOR;
    c1 GenericCursor;
    empname VARCHAR2(200);
BEGIN
    OPEN c1 FOR SELECT ename FROM employees WHERE id = :id AND city = :city USING empid, empcity;
        FETCH c1 INTO empname;
    CLOSE c1;
    RETURN empname;
END;
FUNCTION get_amployee_name (empid INTEGER, empcity VARCHAR2) RETURN VARCHAR2 IS
    empname VARCHAR2(200);
BEGIN
    SELECT ename into empname FROM employees WHERE id = empid AND city = empcity;
    RETURN empname;
END;I have tried to find any info related to pl/sql query execution steps, but can not. Does optimizer uses real pl/sql variables values for generating exec. plan? Or it will be generated only once when function executed first time?

Hi,
It is always better to test yourself. Using bind variable is always a good practice and optimizer avoids hard parsing (soft parsing will be done here) if bind variables are used.
So yes, if this function is being executed several times frequently then second execution onwards it may run faster.
If you want to see actually what is happening behind it, trace it (using tkprof) and see the result.
See the below link to know more about SQL TRACE and tkprof.
http://download.oracle.com/docs/cd/E11882_01/server.112/e16638/sqltrace.htm#PFGRF01020
Regards,
Avinash
Edited by: Avinash Tripathi on Nov 16, 2010 11:46 PM

Bind variables in DB Connect SQL Statement in Oracle

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