performance « JDBC « Java Database Q&A

1. PreparedStatements and performance    stackoverflow.com

So I keep hearing that PreparedStatements are good for performance. We have a Java application in which we use the regular 'Statement' more than we use the 'PreparedStatement'. While trying to move ...

2. Which approach is better performance-wise? (with regard to the usage of variable parameter markers in prepared statement in JDBC)    stackoverflow.com

My objective is to get the DeptNames of certain employees from the Emp table. But the number of employees is varying. Please tell if the below approach is correct and which ...

3. How effective is executeBatch on a Prepared Statement?    stackoverflow.com

Subject to this question, asks it all:How effective is executeBatch method? Is there a performance benchmark, that says.. 'if you have 1000 records to be inserted, using a executeBatch instead of ...

4. Reusing of a PreparedStatement between methods?    stackoverflow.com

We all know that we should rather reuse a JDBC PreparedStatement than creating a new instance within a loop. But how to deal with PreparedStatement reuse between different method invocations? Does ...

5. Please Help me with CachedRowSet Performance Problem!    coderanch.com

6. Performance with preparedStatement.    coderanch.com

Hi All, I have one doubt about usage of preparedStatement. when preparedStatement is used then SQL Statement is cached in the memory. My doubt is whether it cached at COnnection level or at database level. i.e. if i execute an SQL statement with preparedStatement object using one connection (at this time SQL statement is cached in memory) and then close the ...

7. PreparedStatement: Performance bottleneck in using new String(...) in setString meth    coderanch.com

The code you have is creating new character arrays and copying characters for each String object. An alternative is to create one big String object from the entire rec: String everything = new String(rec); Then create substrings for each setString. For example: pstmt.setString(1, everything.substring(0,1)); pstmt.setString(2, everything.substring(1,8)); Under Sun's current implementation, all of the String objects will share the same character array, ...

8. Performance using Statement and Prepared Statement    coderanch.com

hai all, I have a doubt. I am executing a query only once. Which one is more beneficial using a Statement or preparedStatement. I guess statement will be beneficial than preparedstatement because the query is executed only once and for the compiled query need not be stored in the database. Is this true? Thanks shekar.

9. Performance slow down Because of PreparedStatement    coderanch.com

Ronnie, Without a profiling tool, it's hard to tell where the bottleneck is. You could try putting some printlns in to see which call is taking the longest. I am not receiving any out of memory exceptions. You could still be having a memory issue. For example, if the maching is doing a lot of paging to disk/thrashing it would affect ...

10. PreparedStatement - Performance    coderanch.com

Thanks for the link. But that doesn't actually answer the question. The examples given in that link, doesn't use any constant values. The where clause keeps changing all the time. Let me give another example on the same line as mentioned in the link Does code A perform better than code B or not. Code A: PreparedStatement ps = conn.prepareStatement ("select ...

11. Extreme performance degradation using prepared statement    coderanch.com

I'm using a number of queries that basically perform a sum for a few columns. The table the queries operate on is fairly large (couple of milion records). A query uses a number of parameters that control whether some rows are taken along in the final result or not. So far nothing fancy. The odd thing is that if I execute ...

12. in function using PreparedStatement create performance problem or not?    coderanch.com

13. help me in improving performance of prepared statement    coderanch.com

Hi everybody I am trying to insert/update data in oracle database,retreving data from sql database. I am using prepared statements for update the records. its taking 1 hour to update the records about 8000. then i tried oracle batch update but still it is taking same time. below is my code Please help me in improving the performance issue............ Thanks in ...

14. When does a PreparedStatement produce better performance than a Statement?    coderanch.com

Our application builds a where clause dynamically, based on user inputs. There are at least 50 different combinations yielding potentially 50 different queries. The basic logic (in a Servlet) is List list = runQuery (buildQuery(requestParams)) ; // do something with the results Since each request would result in a new prepared statement, even if the query was the same as any ...