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• Creating database connections - Do it once or for each query?

  - by webnoob

  At the moment I create a database connection when my web page is first loaded. I then process the page and run any queries against that conection. Is this the best way to do it or should I be creating a database connection each time I run a query? p.s It makes more sense to me to create 1 connection and use it but I don't know if this can cause any other issues. I am using C# (ASP.NET) with MSSQL.

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• Database server size

  - by David

  I received a recommendation from my hosting provider noting that a general rule in production server management is to ensure that the memory on your database server is larger than the size of your total database. Our database is 1800mb (and growing) and we're being told to purchase a 2GB server. This didn't sit right with me, but I'm not an expert in production server management. We're running a MySQL db with mostly InnoDB tables and some MyISAMs. Thanks!

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• In-memory DB to perform intersects on set slices

  - by IanC

  I have a specific programming need where I need to efficiently store large sorted sets in memory, query them for ranges, and intersect them against other sets that are also queried for ranged. I am looking at Redis, but I can't see a range slice command. MongoDB can only use 1 index, so it has to perform row-level scans, whereas I wish to process using columns that are intersected. I'm also looking at Counchbase, but can't easily determine from the documentation if it is suited to this. I know it uses Memcached, which is AFAIK not suited to this usage. Could anyone share potential solutions for this specific problem? EDIT For example, I need to perform the following: Get the IDs of all cars where the price is between 2000 and 3000, and intersect that will all cars where the engine capacity is between 3000 and 4000.

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• Oracle 11g R2 1???????~?????????????

  - by Yusuke.Yamamoto

  ??2010?11?17???Oracle Database 11g Release2(R2) ???????1???? ????Oracle Database 11g R2 ?????????????????????????? ???98?????????1????????? ???????98?????????????????·?????·??????????! ???? 2010/11/17:????? 2011/01/07:???????(??) ?? Oracle Database 11g R2 ??????? Oracle Database 11g ?????????(????) ??????? Oracle Database 11g R2(???/????) Oracle Database 11g R2 ??????? ?? ??? 2009?11?11? Oracle Exadata Database Machine Version 2 ???? 2009?11?17? Oracle Database 11g R2 ???? 2010?02?01? ?????????????????????????????? 2010?03?31? SAP ? Oracle Database 11g R2 ??????????ISV????????·??????????? 2010?05?18? Windows Server 2008 R2 / Windows 7 ?????????Oracle Database 10g R2 ??? 2010?06?23? Oracle Application Express 4.0 ????(??) 2010?07?09? IDC Japan:2009???? Windows RDBMS ?????????????? 2010?08?17? TPC-C Benchmark Price/Performance ????????(??) 2010?09?13? Patch Set 11.2.0.2 for Linux ????(??) 2010?10?20? Oracle Exadata Database Machine X2 ???? 2010?11?17? Oracle Database 11g R2 ????1?? Oracle Database 11g ?????????(????) ????????????????????????????????(????)? ???? ????? ????(???) ?????·???????·??? ????? ??????????? ???? ??? ????????(???) ?????? Oracle Exadata Database Machine ????? Oracle Database 11g ??(????)? ???? ?????·???????·??? ?? ????????? ?????????? ???? ?????? ????(????·????????) ??????????? ???????????? ????? ???? Customer Voice ????:????IT?????24??365????????????????????? ?Oracle9i Database ?????????????????????Oracle Database 11g ???????????????????????? Oracle9i Database ???????????????? Customer Voice ??????:Oracle Database 11g????????????????????? ?Oracle ASM ???????????????????I/O????????????????????????????????????? ??????? Oracle Database 11g R2(???/????) ???????????????? Oracle 11g R2 ????????? - IT Leaders ??????????11g R2?5???? - ??SE????Oracle??? - Think IT ??????????? Oracle Database 11g Release 2(11gR2) ???????|???????????

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• Restoring a backup SQL Server 2005 where is the data stored?

  - by sc_ray

  I have two Sql Server database instances on two different machines across the network. Lets call these servers A and B. Due to some infrastructural issues, I had to make a complete backup of the database on server A and robocopy the A.bak over to a shared drive accessible by both A and B. What I want is to restore the database on B. My first issue is to restore the backup on server B but the backup location does not display my shared drive. My next issue is that server B's C: drive has barely any space left and there are some additional partitions that have more space and can house my backup file but I am not sure what happens to the data after I restore the database on B. Would the backup data fill up all the available space on C:? It will be great if somebody explain how the data is laid out after the restore database is initiated on a target database server? Thanks

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• ??????????·??????????? - DBSC???!??????·??????

  - by Yusuke.Yamamoto

  ????? ??:2010/11/09 ??:???? ?????????????????·??????(??????)????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? ???????????·????????????????????·????????????????????????????????????????????????????????????????????????????????????????????????????????????????RBAC ????????? ????????????????? http://thinkit.co.jp/story/2010/11/09/1852

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• ????????????????????????????????????Tips

  - by Yusuke.Yamamoto

  ????? ??:2010/12/14 ??:?????? ???????????????????????????????????????????????????????????????????Tips?????????????????????????????????????????????????????????????????????????????????????????????????? ??????!???????TIPS/ ??????????????????????????TIPS????????TIPS?????TIPS/ ??????!????????:???????PSR 11.2.0.2??TIPS:PSR 11.2.0.2????/PSR 11.2.0.2???? ????????? ????????????????? http://www.oracle.com/technology/global/jp/ondemand/otn-seminar/pdf/1214_1100_UpgradeTIPS.pdf

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• ??????Oracle Developer Tools for Visual Studio(ODT)???

  - by Yusuke.Yamamoto

  ????? ??:2010/11/12 ??:???? Oracle ??Oracle Developer Tools for Visual Studio(???ODT)????? Visual Studio ??????????????????ODT ????????????????????ODT ????????????SQL*Plus ???????????????????????·????????????Oracle??????·????????????????? ?????????????ODT ???????ODT ???????Visual Studio ?? ODT ???Visual Studio ?? Oracle??????·????????????????? ????????? ????????????????? http://codezine.jp/article/detail/5499

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• ???????/????????????????? SQL????????? ??? Part1&2

  - by Yusuke.Yamamoto

  ????? ??:2010/10/12 ??:??????/?? ????????????????????????????????????????????SQL????????????????????????????????????????????????????SQL??????????????????????????????????????????????????SQL???????????????????????????????????????????????????!! ??????SQL???????????????/ SQL?????????????SQL????????????????SQL???????????????????:????SQL??????/ SQL?????????SQL???????????????????:?????SQL??????/ ??????·???????????????????????(???????????????·??)??? ????????? ????????????????? http://otndnld.oracle.co.jp/ondemand/otn-seminar/movie/OCSTuning12_10121330.wmv http://www.oracle.com/technology/global/jp/ondemand/otn-seminar/pdf/SQL.pdf

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• ????????SQL Developer?Data Modeler?????????????

  - by Yusuke.Yamamoto

  ????? ??:2010/05/18 ??:?????? Oracle ?GUI?????????···??????????????????SQL Developer ? Data Modeler ???????GUI???????????????????????????SQL Developer ? Data Modeler ?????????????????? ????Oracle SQL Developer Data Modeler ??Oracle SQL Developer Data Modeler ????Oracle SQL Developer ???Oracle SQL Developer ???????? ????????? ????????????????? http://www.oracle.com/technology/global/jp/ondemand/otn-seminar/pdf/100518_sqldeveloper_evening.pdf

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• Syntax Error with MySQL 5.1 Server

  - by Mr.Z

  I am trying to connect to a server remotely using the command line client window. I am using MySQL 5.1 and I do not know why I am getting syntax error. If you can help me, that would be much appreciated. username as user password as pass hostname as example.com I have tried: mysql> -u user -h example.com -p ; mysql> -h example.com -u user -p ; I have looked at the reference manual and other verisons of remote connection with Server 5.1 but I can't see the syntax error.

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• To create new DB connection or not?

  - by Yeti

  I'm running a cron job (every 15 minutes) which takes about a minute to execute. It makes lots of API calls and stores data to the database. Right now I create a mysql connection at the beginning and use the same connection through out the code. Most of the time is spent making the API calls. Will it be more efficient to create a new database connection only when it's time to store the data (below)? Kill the last connection Wait for API call to complete Create new DB connection Execute query Goto 1

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• Guidance required: FIrst time gonna work with real high end database (size = 50GB).

  - by claws

  I got a project of designing a Database. This is going to be my first big scale project. Good thing about it is information is mostly organized & currently stored in text files. The size of this information is 50GB. There are going to be few millions of records in each Table. Its going to have around 50 tables. I need to provide a web interface for searching & browsing. I'm going to use MySQL DBMS. I've never worked with a database more than 200MB before. So, speed & performance was never a concern but I followed things like normalization & Indexes. I never used any kind of testing/benchmarking/queryOptimization/whatever because I never had to care about them. But here the purpose of creating a database is to make it quickly searchable. So, I need to consider all possible aspects in design. I was browsing archives & found: http://stackoverflow.com/questions/1981526/what-should-every-developer-know-about-databases http://stackoverflow.com/questions/621884/database-development-mistakes-made-by-app-developers I'm gonna keep the points mentioned in above answers in mind. What else should I know? What else should I keep in mind?

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• Connection pooling options with JDBC: DBCP vs C3P0

  - by Dema

  What is the best connection pooling library available for Java/JDBC? I'm considering the 2 main candidates (free / open-source): Apache DBCB - http://commons.apache.org/dbcp/ C3P0 - http://sourceforge.net/projects/c3p0 I've read a lot about them in blogs and other forums but could not reach a decision. Is there any relevant alternatives to this two?

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• Help with connection string

  - by DanSogaard

  So I'm trying to connect to my database at the specified location, and the connection is established as long as the db at the same location specified at DataSource field, but what if I tried to distribute my application, the file path will change and will lead to errors I want to avoid. Here is my connstring: string connstring = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\PC1\Documents\Visual Studio 2008\Projects\Test\Test\bin\Debug\MyDatabase01.accdb;Persist Security Info=true"; Is there anyway I can define DataSource location to be at the same folder?.

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• Connection Pooling in J2SE?

  - by Zombies

  It is hard to find a resource on this without finding J2EE, but here is what I am looking for: All I have is a standard J2SE app, it makes a lot of DB connections. I simply need to make use of a connection pool. Any suggestions?

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• How do I detect a connection break using MessageQueue

  - by Lopper

  My application written in C# makes use of the MessageQueue class in .NET for communicating messages with another remote application and the MessageQueue should always be "connected" (heartbeat present) with the remote messageQueue under all circumstances. If it is not "connected", then it signals that something is wrong and my application will need to perform some actions such as updating an event log. Is there a method in the MessageQueue class that can be used to detecting such breaks in connection?

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• JBoss Database Connection Pool

  - by Salman

  I am new to jboss and i have been asked to incorporate jboss connection pooling mechanism with an existing web application. Considering that a web application database layer is properly written i.e. all resultsets, statements and connections being closed properly when not needed, What all code changes i will have to make in my web app after i have configured the jboss datasource properly. Can anybody please point me to a tutorial or a code sample which uses jboss datasource in a web app.

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• DSNless connection for Aruna DB?

  - by vijay

  Right now we are using Fastpath ODBC DSN connection method to access our "ARUNA" db. Our development platform is .NET C#. But we are in need of connecting the DB without using DSN. Till now my search in google is turning futile. In the meantime I think i will get my answer here quickly. Is it possible to connect Aruna using DSN less method? Thanks in advance guys.

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• Encrypting connection string in classic asp

  - by grega g

  Is it possible to store encrypted connection string so it can be used from server-side vbscript? Was there an equivalent of web.config in 'the good old days'?

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• iPhone Simulator - SImulate a Slow Connection ?

  - by Chris

  Is there a way to slow down the internet connection to the iPhone Simulator, so as to mimic how the App might react when you are in a slow spot on the cellular network?

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• What is best approach for connection pooling?

  - by Bhushan

  I am implementing connection pooling in project. Performance wise which is better approach to do it? Hibernate (using C3PO or DBCP) Configuring JDBC data-source in Application server. Application server Portability is not an important factor for me. Please suggest the approach.

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• C# : How to set test TCP connection timeout?

  - by Prince OfThief

  I try to test TCP connection with the following code. System.Threading.Thread t = new System.Threading.Thread(() => { using (TcpClient client = new TcpClient()) { client.Connect(ip, Convert.ToInt32(port)); } } }); t.Start(); How to set time out if the ip or port is invalid?

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• check internet connection in cocoa application

  - by Nava Carmon

  Hi How do I check internet connection in cocoa application? Can Reachability code from iphone apple example be reused for this purpose? Thanks, Nava

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• Setting Quercus db connection encoding to UTF-8 (urgent problem and need your great help)

  - by sokcmss

  Now we are going to use java class in my website developed with PHP + mySQL. I came to know Quercus and it worked well. But only problem is encoding. Quercus is providing ISO8859 encoding in default and all database in UTF-8 is not shown properly like ???. If anybody know the way to set Quercus db connection encoding to UTF-8, please help me. Look forward to hearing good news urgently.

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