Wrong use of Java and Mysql?

I currently have a dedicated database server which runs MySQL. On the MySQL server I have 15 tables with the InnoDB engine.
These tables all have a column called "last_sync". Whenever a tablerow is updated by a java client, the "last_sync" column is refreshed.
Other java clients will query these tables with a query that looks something like this
"Select count(*) from table where last_sync > (currenttime-5 seconds) and last_sync <= (currenttime)"
So much for the background info. To stresstest my server, and see how much queries per second he can handle,
I installed Super Smack (http://vegan.net/tony/supersmack/). Super smack is a stresstest tool which can be given 2 start-up parameters.
These parameters say how many clients/threads should connect and how many times the query should be ran. When installed it
is possible to alter the stress query by editting the "select-key.smack" file. I did so and placed a query that is equal to the above statement.
Super-smack (as well as MySQL Administrator and Innotop) tells me that it can execute 50K queries per second when I use a single connection.
When I use two connections I get roughly 88K. This is logical since my server is a dual-core machine. I run super smack on my DB server.
Now, whenever I try to stresstest my server with a java written test, I can barely get to 10k queries per second on a single connection.
The app is being runned on the DB server as well. Furthermore when I add another connection, the limit stays at 10k queries.
When monitoring the connection threads with MySQL Administrator the connection threads
are often "sleeping" while, when I run the SuperSmack test they are constantly in use.
Another detail, the connection threads also gives info what it's doing ("Executing query", "Writing to net" etc.). I occasionally see "Rollback", which is strange
since my stress query is not failing in my stress application.
To make this complete, I've uploaded my little test along with the SQL creation code to the following URL: HERE
It should work straight out of the box. Naturally the table creation query should be ran and the connection settings specified in the java file.
Basically the one thing I cannot understand is why supersmack runs a factor 5-8 faster than my java test while they are
using the exact same table and are executed on the exact same machine. This however limits out the possibility of it being a database config setting.
Im personally guessing im incorrectly using transactions or the MySQL connector/j is giving problems.
I understand this might take some effort, so i'll try to add more dukes than a regular post.
-Edit. Was under the assumption that you could add more than 10 duke points.
Thanks in advance
Edited by: killingdjef on Mar 25, 2009 6:52 AM
Edited by: killingdjef on Mar 25, 2009 10:28 AM

killingdjef wrote:
10K can be perfect, however, when I run Supersmack and see that my database server can handle 8 times more queries per second on the exact same table with the exact same query,
I'm beginning to wonder if im doing something incorrect or if i'm missing something crucial.
I have no clue whats a reasonable amount of queries per second is for a dedicated innodb server
but based on the benchmark test im thinking I can squeeze out more.
The stresstest isnt representational for a single client. Its merely a simulation how many clients could be served.
The higher the queries per second, the more clients that can be served. Im trying to find out what the limit would be.I am quite aware of what impact means in terms of client processing. That however isn't the point. The point is that you intend to serve a market of some sort and support some reasonable growth. It is pointless to try to do more than that.
If you have enough "clients" running directly against that database to generate 10k queries a second then your architecture (and thus design and implementation) is very likely flawed.
For example
1. What happens to all of those clients when the database goes down either accidently or on purpose?
2. Those clients are hitting the database direct, and I don't see how you are going to get enough clients like that without internet consumers. And you absolutely do not want to expose the database that way.
3. Conversely say you have a call center with 2000 support people, which is a huge call center. There is no way that number could generate even close to 10k a second.
4. A comparable txn business model is credit card processing and a sustained speed like that would be sufficient to handle all of the credit card transaction business in the US during the peak xmas season. With extra left over.
Not to mention that you didn't address the network problem at all. Note that the numbers I outlines above doesn't allow any bandwidth for the data to get into the server in the first place.
And inserts will take more time than queries.
But as I already said, if you are using transaction then that will have an impact. Connections/threads will as well.

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Moderator action: crosspost deleted.

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At
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http://www.simtel.net/product.php[id]93174[sekid]0[SiteID]simtel.net
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At
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            stat_target.executeBatch();
            con_target.commit();
        } catch (BatchUpdateException be) {
            System.out.println("be: "+be.getErrorCode());
            System.out.println("be: "+be.getMessage());
            be.printStackTrace();
            System.out.println("be: "+i);
        } catch (SQLException se) {
            System.out.println("se: "+se.getErrorCode());
            System.out.println("se: "+i);
}

What is the error message?
I advice you to use prepared statement for batch inserting.

[JAVA] problems with java and mysql

Hi, i have already installed php + mysql and work's them fine, but i want to install java + mysql. I have downloaded eclipse and installed its, that's ok. I have download tomcat and, that's ok. I have download module jconnector and have copied the file .jar in the java home and set classpath. Run and compiled this source that's ok. At runtime the program ask: Impossible connection at the database, why ? It's the source of program:
[JAVA]
import java.sql.*;
public class connessione {
private String nomeDB; // Nome del Database a cui connettersi
private String nomeUtente; // Nome utente utilizzato per la connessione al Database
private String pwdUtente; // Password usata per la connessione al Database
private String errore; // Raccoglie informazioni riguardo l'ultima eccezione sollevata
private Connection db; // La connessione col Database
private boolean connesso; // Flag che indica se la connessione � attiva o meno
public connessione(String nomeDB) { this(nomeDB, "", ""); }
public connessione(String nomeDB, String nomeUtente, String pwdUtente) {
this.nomeDB = nomeDB;
this.nomeUtente = nomeUtente;
this.pwdUtente = pwdUtente;
connesso = false;
errore = "";
// Apre la connessione con il Database
public boolean connetti() {
connesso = false;
try {
// Carico il driver JDBC per la connessione con il database MySQL
Class.forName("com.mysql.jdbc.Driver");
// Controllo che il nome del Database non sia nulla
if (!nomeDB.equals("")) {
// Controllo se il nome utente va usato o meno per la connessione
if (nomeUtente.equals("")) {
// La connessione non richiede nome utente e password
db = DriverManager.getConnection("jdbc:mysql://localhost/" + nomeDB);
} else {
// La connessione richiede nome utente, controllo se necessita anche della password
if (pwdUtente.equals("")) {
// La connessione non necessita di password
db = DriverManager.getConnection("jdbc:mysql://localhost/" + nomeDB + "?user=" + nomeUtente);
} else {
// La connessione necessita della password
db = DriverManager.getConnection("jdbc:mysql://localhost/" + nomeDB + "?user=" + nomeUtente + "&password=" + pwdUtente);
// La connessione � avvenuta con successo
connesso = true;
} else {
System.out.println("Manca il nome del database!!");
System.out.println("Scrivere il nome del database da utilizzare all'interno del file \"config.xml\"");
System.exit(0);
} catch (Exception e) { errore = e.getMessage(); }
return connesso;
public static void main(String [] args) {
connessione a=new connessione("asta","root","");
if(a.connetti())
System.out.println("Connessione al database riuscita");
else
System.out.println("Connessione al database non riuscita");
[JAVA]

With this line I always pass the username and password also:
db = DriverManager.getConnection("jdbc:mysql://localhost/" + nomeDB);
db = DriverManager.getConnection("jdbc:mysql://localhost/" + nomeDB, useName, Password);
Make sure you create your users in MySQL with the correct permissions

Record Set Variables used in PHP and MYSQL model

PHP MYSQL server model.
I'e been using dreamweaver for ages and have allways admired
how well they have kept compatibility between versions. The recent
8.02 release was a little bit of a shock when I had to start
rewriting all my PHP MYSQL recordset queries!
In the bulk of my SQL queries I detect on of two states for a
query parameter and in some queries the parameters are used more
then once. By creating a single variable in for the recordset I've
allways been able to check and recheck the single variable in the
query using the standard recordset. Now in version 8.02 I am
getting the error: Missing type for variable:colname
So where:
SELECT *
FROM links
WHERE LinkID = colname or colname=-1
ORDER BY `Level` DESC
used to work it does not work any more!
I'm being forced to rewrite the query:
SELECT *
FROM links
WHERE colname in (-1,LinkID)
ORDER BY `Level` DESC
Simple enough but where the queries get more complex the more
variables I have to define!
This is not Cool! Can we get a bug fix for this so that I
dont have to rewrite all my queries!
P.S. Since when did anyone say that the Dreamweaver was SQL
injection safe! This issue should have been resolved back in the
Ultradev days! I guess Kudos goes to Adobe for finally trying to
address one of the biggest glaring issues dreamweaver has had since
it's inception. I was allways kinda upset that I was forced to pass
variables as text to sprintf when I knew they where numbers!
If I Look at the resultant code now I'm sure the result
sprintf will still be using %s instead of optionally specifying one
of the many diferent types (
% - a literal percent character. No argument is required.
b - the argument is treated as an integer, and presented as a
binary number.
c - the argument is treated as an integer, and presented as
the character with that ASCII value.
d - the argument is treated as an integer, and presented as a
(signed) decimal number.
e - the argument is treated as scientific notation (e.g.
1.2e+2).
u - the argument is treated as an integer, and presented as
an unsigned decimal number.
f - the argument is treated as a float, and presented as a
floating-point number (locale aware).
F - the argument is treated as a float, and presented as a
floating-point number (non-locale aware). Available since PHP
4.3.10 and PHP 5.0.3.
o - the argument is treated as an integer, and presented as
an octal number.
s - the argument is treated as and presented as a string.
x - the argument is treated as an integer and presented as a
hexadecimal number (with lowercase letters).
X - the argument is treated as an integer and presented as a
hexadecimal number (with uppercase letters).
This would further protect a query from being SQL Injected!
I'd hope that Adobe would enable a Site specfic setting or
something that would change the behaviour to match the passed
parameter to sprintf with the specified variable type (I'd guess
best practice to be Numeric be type f Text be type s and Date as
type s as well)

Start by saying bump.
I've still no word from Adobe if they are doing anything with
this problem. Any one had any replys from Adobe on it? Any one
found a work around with recoding queries?

JAVA and MYSQL NOW() Function only displays year?

I have run into something interesting with running the MYSQL NOW() function.
Here is what I'm running:
SELECT NOW() from databaseThis gives me "2010" only. Any idea why this may be? If I run the same mysql query in mysql from the command line I get the correct output "2010-01-14 14:10:03".
Has anyone else seen this behavior?
Edited by: crusherdestroyer on Jan 14, 2010 12:19 PM

I'm not doubting that. Here is how I'm using it.
import java.util.Date;
String userName = "username";
               String password = "password";
               String url = "jdbc:mysql://localhost/database";
               Class.forName ("com.mysql.jdbc.Driver").newInstance ();
               conn = DriverManager.getConnection (url, userName, password);
               //System.out.println ("Database connection established");
               Statement s = conn.createStatement ();
               s.executeQuery ("SELECT NOW() from database' ");
               ResultSet rs = s.getResultSet ();
               int count = 0;
               Date timenow = null;
               while (rs.next ())
                   timenow = rs.getDate ("NOW()");
                ++count;
System.out.println (timenow);Tried this too.
String userName = "username";
               String password = "password";
               String url = "jdbc:mysql://localhost/database";
               Class.forName ("com.mysql.jdbc.Driver").newInstance ();
               conn = DriverManager.getConnection (url, userName, password);
               //System.out.println ("Database connection established");
               Statement s = conn.createStatement ();
               s.executeQuery ("SELECT NOW() from database' ");
               ResultSet rs = s.getResultSet ();
               Date timenow = null;
                   timenow = rs.getDate ("NOW()");
System.out.println (timenow);Edited by: crusherdestroyer on Jan 14, 2010 2:04 PM
Edited by: crusherdestroyer on Jan 14, 2010 2:07 PM

Steps cor connectivity java and mysql

Hi can any one list the steps for the connectivity of java & mysql.
jdk1.6 & mysql5

1) Learn JDBC: http://java.sun.com/docs/books/tutorial/jdbc/index.html
2) Obtain the MySQL JDBC driver: http://www.mysql.com/products/connector/j/
3) Read the MySQL JDBC driver reference documentation: http://dev.mysql.com/doc/refman/6.0/en/connector-j-reference.html

Anyone Update Date/Timestamp using CachedRowSets, Java and Oracle 10g

How to do this...
a very small, direct snippet of code would be great..
or direct me to a CURRENT document.
Thanks

What will I get back from Oracle with TO_CHAR?
I am using a quoted string and supplying parameters.
In other words, when I do the date comparison with a TO_DATE I already know that I am getting 12:00:00 AM back and the paramter I can manipulate.
Example:
TO_DATE(datefield) = formattedDateParameter
The "TO_DATE(datefield)" is part of my prepared sql statement.
I am not sure how much manipulation of the where clause I can do.
My querystring would look like the following.
sql = "SELECT " + REPORTTRANSDATE + REPORTRETURNCODE + " FROM " + REPORTTABLE + " WHERE " + REPORTD + "=?" + " AND " + "TO_DATE(" + REPORTTRANSDATE + ")" + ">=?" + " AND " + "TO_DATE(" + REPORTTRANSDATE + ")" + "<=?" + " ORDER BY " + REPORTTRANSDATE;
Thanks.

Using Safari & Java from Spain

To anyone who may have knowledge of Java/Safari in Spain or Europe.
I am currently studying abroad in Spain and i have noticed that my computer and others have been having troubles using the Java Script for Facebook, Yahoo, Pogo.com and other sources. We currently run a slightly out of date wireless network based off PCs; However, PCs are having the same issues.
Does anyone know if Spain or Europe doesn't use Java as much. And does anyone know if Proxies are affect the use of Java and if so, where can i enter proxy information to fix the issue.
Thank you to anyone who replies.

I was thinking about my problem some more and i was
wondering if you or anyone knew how to set proxies
for Java. For example, yes, you can set proxies under
settings/network and you can set proxies in Firefox,
iChat, and more. Is there a way for Java?
Java is not a protocol, it's an application framework. It communicates using protocols in your ip stack. You can set proxies for those protocols. I suspect you mean javascript, but the same applies there, except that it's all http. I don't want to get into rudimentary aspects of networking, I'm sure you can find very good references.
What's really interesting is that you seem to be implying that there is some sort of censorship of web sites in Spain - just like in China. And that you're looking for a what's known as a circumventor. I know that there was a recent ruling in the Spanish counrts that judges could block web sites they found to be a threat to national defense. Is this perhaps what you're seeing?

Set a max Upload quantity dreamwaver php and mysql

The issue,
using dreamweaver php and mysql I Would like to set a max
quantity limit on file upload per user. i.e max 5 uploaded images
allowed per user.
Here is a basic example of the creation. Just need the
implementation of how to set a max upoad limit.
create table authors(
id int not null auto increment primary key,
name varchar(10) not null
image_quantity tinyint(1),
create table images(
aid int not null,
image_filename varchar(50),
foreign key (aid) references authors(id)
User id 1 would upload a file into the table images from a
php or html webpage. i.e set values "thomas.jpeg", "1"
i want to set a max upload of 5 images per user. (a folder
for each user id will be created and photos stored in that).
I could add a field of max_upload tinyint(1) to the table
users and construct a php script that could add the amount of
images entered by a user into the images table and add a +1 to each
added. Problem is i dont know how to create that script or mysql
querty in order to enter into a recorset for example.
As anyone have any ideas of the best way to set a max
quantity limit of uploads.
Thank you.

The issue,
using dreamweaver php and mysql I Would like to set a max
quantity limit on file upload per user. i.e max 5 uploaded images
allowed per user.
Here is a basic example of the creation. Just need the
implementation of how to set a max upoad limit.
create table authors(
id int not null auto increment primary key,
name varchar(10) not null
image_quantity tinyint(1),
create table images(
aid int not null,
image_filename varchar(50),
foreign key (aid) references authors(id)
User id 1 would upload a file into the table images from a
php or html webpage. i.e set values "thomas.jpeg", "1"
i want to set a max upload of 5 images per user. (a folder
for each user id will be created and photos stored in that).
I could add a field of max_upload tinyint(1) to the table
users and construct a php script that could add the amount of
images entered by a user into the images table and add a +1 to each
added. Problem is i dont know how to create that script or mysql
querty in order to enter into a recorset for example.
As anyone have any ideas of the best way to set a max
quantity limit of uploads.
Thank you.

Wrong use of Java and Mysql?

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