redundancy

Database normalization - who's right?

由 橙三吉。 提交于 2019-11-27 03:22:33
问题 My professor(who claimed to have a firm understanding about systems development for many years) and I are arguing about the design of our database. As an example: My professor insists this design is right: (list of columns) Subject_ID Description Units_Lec Units_Lab Total_Units etc... Notice the total units column. He said that this column must be included. I tried to explain that it is unnecessary, because if you want it, then just make a query by simply adding the two. I showed him an

How to deploy an ASP.NET Application with zero downtime

由 ╄→尐↘猪︶ㄣ 提交于 2019-11-26 21:09:16
To deploy a new version of our website we do the following: Zip up the new code, and upload it to the server. On the live server, delete all the live code from the IIS website directory. Extract the new code zipfile into the now empty IIS directory This process is all scripted, and happens quite quickly, but there can still be a 10-20 second downtime when the old files are being deleted, and the new files being deployed. Any suggestions on a 0 second downtime method? You need 2 servers and a load balancer. Here's in steps: Turn all traffic on Server 2 Deploy on Server 1 Test Server 1 Turn all

How to deploy an ASP.NET Application with zero downtime

由 我是研究僧i 提交于 2019-11-26 09:05:04
问题 To deploy a new version of our website we do the following: Zip up the new code, and upload it to the server. On the live server, delete all the live code from the IIS website directory. Extract the new code zipfile into the now empty IIS directory This process is all scripted, and happens quite quickly, but there can still be a 10-20 second downtime when the old files are being deleted, and the new files being deployed. Any suggestions on a 0 second downtime method? 回答1: You need 2 servers
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