connection-pooling

object pool vs connection pool

What is the exact difference between object pool and connection pool? Is there any difference to in their algorithm for utilizing memory. msdn says "Object pooling lets you control the number of connections you use, as opposed to connection pooling, where you control the maximum number reached." What exactly this mean? Please help me ...

Associating Postgres Connections with Java code

I'm trying to track down leaky connections. (In particular, I'm noticing connections staying open past the closure of the last DataSource, using C3P0 for connection pooling. I suspect a bug but want to ensure I'm not just being stupid first.) Is there a good way to associate open connections from the Postgres view postgres=# select ...

retry logic uptil databases comes up

Dear All, Through my java code i m connecting to multiple databases using connection pooling.if my database goes down i need handle the retry logic to get connection until its return a connection object. ...

JDBC communication link failure after some time

Hi, I am using JDBC with proxool connection pool to connect to mysql DB. I am selecting large number of rows from multiple threads and after some time i get an error saying communication link failure, Last packet sent to the server was ...ago. I am closing connection,statement,resultSet in every thread. The fetching time increases grad...

Does the setting time_out in mysql affect JDBC connection pool?

It's usually set to 60 seconds. But I think con pool will hold the connection, so is there any conflict? Thank you. ...

my site show error

my site show this error you can also check online it visit only 4 to 5 pages then http://www.pakcarid.com/ System.Data.OleDb.OleDbException: System resource exceeded. Source Error: Line 267: OleDbDataAdapter dtt = new OleDbDataAdapter(tot); Line 268: DataSet dstt = new DataSet(); Line 269: dtt.Fill(ds...

what is the criteria to adjust the propertires of pooling conenction.

how can i adjust the properties of connection pooling like setMaxPoolSize(); setMaxIdleTime(); setMaxPoolSize(); setMinPoolSize(); setInitialPoolSize(); setPropertyCycle(); setMaxStatements(); ...

Using Django ORM in threads and avoiding "too many clients" exception by using BoundedSemaphore

Hi, I work on manage.py command which creates about 200 threads to check remote hosts. My database setup allows me to use 120 connections, so I need to use some kind of pooling. I've tried using separated thread, like this class Pool(Thread): def __init__(self): Thread.__init__(self) self.semaphore = threadin...

What is the relationship between open SqlConnections in the client app and processes in SQL Server?

I just tried to make a simple schema change to a table in a SQL Server database (by using the Design tool in SMSS). Whenever I tried to save the change, it kept timing out. I wondered whether this was due to existing connnections which were 'locking' the table. I decided to kill connections as an experiment. I queried master..sysprocess...

Connection pool problem with Spring and programmatic transaction management

Hi everyone ! I need your help in order to solve connection pool problem with Spring. I’m using Spring with Java 1.4 (no annotation). Here is the datasource and the connection pool definition: <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName"> <...

What's the proper way to handle JDBC connections with Spring and DBCP?

I'm using the Spring MVC to build a thin layer on top of a SQL Server database. When I began testing, it seems that it doesn't handle stress very well :). I'm using Apache Commons DBCP to handle connection pooling and the data source. When I first attempted ~10-15 simultaneous connections, it used to hang and I'd have to restart the se...

Are Ado.net (2.0+) Connection Pools pre Application Domain or per Process

I'm trying to understand the pooling theory w.r.t. to interactions between ADO.NET and SQL Server much better and haven't found the definitive answer. I have always assumed per process but it's just occurred to me that it could be per AppDomain. Any in depth references would also be appreciated. ...

JDBC connection pooling issue

Hello I have, I might say, a quite a big issue. I'm working on Java web application which use springs BasicDataSource to setup DB connection. I was testing the application locally and it works just fine... but, when application is online, connection to DB in some point just stuck. I was than investigating regarding connection pooling, ...

Connection Pooling over New Connection instance per Thread (JDBC)

Hi, I am creating a multi-threaded application. However, I have experienced lots of unexpected behavior from my application when I have one connection object serving all threads. I am in a dilemma. Should I let every thread create, use and dispose its own connection object or should I use a connection pool? I have tried connection po...

Setup Connection Pooling in Spring MVC

Hi All, Can somebody help me setup connection pooling in Spring MVC. Later next month, I will release my first local intranet website powered by Spring MVC 2.5 and Jquery. This is my first attempt at web development =) I am not sure but, I am only using this in my spring configuration file and I saw this in the Spring MVC step By Ste...

What is the danger in simply increasing the Connection Pool?

I'm doing some performance testing against an Apache server and getting the dreaded message "the context pool has been exhausted! Dun Dun Dun." (dramatic emphasis added) The current proposal floating around by the devs is to simply increased the connection pool-size. While this may be valid, little bells are going off in my head saying...

How can UNCLOSED connection be found in OC4J/Oracle ?

I fixed and use Connection Pool to get the DB Connection from JSP to Oracle Database now. But then I found out from the OC4J console at once that there are many UNCLOSED/NOT-CLOSED connection. I am using OC4J 9.0.4.1 and Oracle 10g. Is there any effective way to find out the location or area that the connection is not closed. In addit...

Define connection pool size in iis 7 (not by connection string)

So our connection string is constructed from app settings rather than stored as an actual connection string. Stupid I know, was done years before I was here. Question is, can I do something in the web.config or in IIS itself to define the processes default connection pool from a configuration standpoint so I don't have to change the cod...

Connection pool query results jumping between live and old data?

I'm developing a Java SE application with a MySQL database. It uses a connection pool of size 10 as there are many screens. Each screen has a Thread that will update some JTables about every 10 seconds. My connection pooling code is taken from http://java.sun.com/developer/onlineTraining/Programming/JDCBook/conpool.html with a few method...

jboss mysql connection validation

Hi, when I put <check-valid-connection-sql>select 1</check-valid-connection-sql> in jboss datasourse config I get this exception: java.lang.IllegalArgumentException: id to load is required for loading org.hibernate.event.LoadEvent.<init>(LoadEvent.java:74) org.hibernate.event.LoadEvent.<init>(LoadEvent.java:56) org.hibernate.impl.S...