=========================================================================
If you are modifying the SQL Server database engine and SQL Server Agent service accounts, you can modify them in SQL Server Configuration Manager.
Here is an example of modifying the Proxy service account:
Right-click the Proxy service for the default instance and select Properties.
650) this.width=650; "title=" clipboard "style=" Border-top:0px;border-right:0px;background-image:none; border-bottom:0px;padding-top:0px;padding-left:0px;border-left:0px;padding-right:0px, "border=" 0 "alt=" clipboard "Src=" Http://img1.51cto.com/attachment/201410/2/639838_1412236291PCQ5.png "height=" 432 "/>
Then browse to select the new agent service account you want to use.
650) this.width=650; "title=" clipboard[1] "style=" border-top:0px;border-right:0px;background-image:none; border-bottom:0px;padding-top:0px;padding-left:0px;border-left:0px;padding-right:0px, "border=" 0 "alt=" clipboard [1] "src=" Http://img1.51cto.com/attachment/201410/2/639838_1412236296Dsvq.png "height=" 484 "/>
If you are modifying a service account for Reporting Services, there is no way to modify it in Configuration Manager.
650) this.width=650; "title=" clipboard[2] "style=" border-top:0px;border-right:0px;background-image:none; border-bottom:0px;padding-top:0px;padding-left:0px;border-left:0px;padding-right:0px, "border=" 0 "alt=" clipboard [2] "src=" Http://img1.51cto.com/attachment/201410/2/639838_14122363059B5q.png "height=" 435 "/>
You will find the attribute inside, where there is no modification to the account.
650) this.width=650; "title=" clipboard[3] "style=" border-top:0px;border-right:0px;background-image:none; border-bottom:0px;padding-top:0px;padding-left:0px;border-left:0px;padding-right:0px, "border=" 0 "alt=" clipboard [3] "src=" Http://img1.51cto.com/attachment/201410/2/639838_1412236310LYrO.png "height=" 484 "/>
This time we need to open the Reporting Service Management tool, select "Service Account", make relevant changes.
650) this.width=650; "title=" clipboard[4] "style=" border-top:0px;border-right:0px;background-image:none; border-bottom:0px;padding-top:0px;padding-left:0px;border-left:0px;padding-right:0px, "border=" 0 "alt=" clipboard [4] "src=" Http://img1.51cto.com/attachment/201410/2/639838_1412236320zNY1.png "height=" 484 "/>
=========================================================================
This article from "Zeng Hung Xin Technical column" blog, declined to reprint!
Considerations for modifying the SQL Server service account