Re m ove a SQL Se r ve r Login a n d Use r in VB.NET

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Re m ove a SQL Se r ve r Login a n d Use r
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I n t he norm al course of dat abase m anagem ent , it becom es necessary t o rem ov e as well as add dat abase users. Since a SQL Ser ver dat abase user has t wo different secur it y account t ypes, y ou m ust rem ov e bot h t o flush a user com plet ely from a dat abase serv er. To pr ev ent orphaned user account s, SQL Ser v er doesn t allow y ou t o delet e t he login for a user w it hout delet ing t he user account s associat ed wit h t hat login. Rem ov ing t he user account s wit hout elim inat ing t heir login st ill allows a user t o access a dat abase ser ver, and t he login can access any dat abases wit h a guest account .
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I n addit ion t o being unable t o rem ove a login wit h one or m ore associat ed user account s, y ou cannot rem ove a login t hat is current ly in use, owns a dat abase, or owns a j ob in t he m sdb dat abase. A j ob is a sequence of st eps for aut om at ing a t ask t hat is defined in t he m sdb dat abase, one of t he built - in dat abases t hat SQL Server uses t o m anage it self. As m ent ioned prev iously, you can nev er r em ove t he sa
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login from a SQL Server inst ance.
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Befor e y ou at t em pt t o r em ove a login, it s useful t o sur vey any associat ed user secur it y account s associat ed w it h t he login. This perm it s y ou t o m ak e sur e t hat you can r em ove all of t he user securit y account s associat ed w it h a login before at t em pt ing t o rem ov e t he login. I nv ok e t he sp_helplogins syst em st or ed procedur e wit h t he nam e of t he login for which you re seek ing infor m at ion, as show n in t he follow ing code. The syst em st or ed procedur e r et urns a r esult set com prising t wo recordset s. The first r ecordset cont ains a single row for t he login t hat y ou specify. The second recordset cont ains a r ow for each user account associat ed wit h t he login nam ed as t he argum ent for t he sp_helplogins syst em st ored procedure. I f you don t specify a login nam e as an argum ent w hen y ou inv oke sp_helplogins, t he syst em st or ed procedur e st ill r et urns t wo recordset s. Howev er, t hese recordset s ret urn inform at ion for all t he logins on t he cur rent SQL Ser ver inst ance. --Return info about a login, including --its database user accounts. EXEC sp_helplogins @LoginNamePattern= vbdotnet1 Figur e 7- 2 shows t he t w o r ecordset s t hat result from running sp_helplogins vbdot net 1 aft er first inv ok ing t he scr ipt in t he preceding sect ion. The fir st recordset st art s wit h t he login nam e follow ed by a part ial display of t he login s SI D. The nex t t wo colum ns indicat e t he default dat abase and language for t he login. The next - t o- last colum n, AUser, is yes w hen t he login has at least one corr esponding user account . The last colum n, ARem ot e, indicat es whet her t he login specifies a r em ot e login for a link ed serv er. The second recordset prov ides inform at ion about each user account for t he login. The first and t hird colum ns denot e, respect ively , t he login nam e and t he user nam e. By default , t hese are t he sam e, but you can ov er ride t his convent ion. The second colum n designat es t he dat abase t o w hich t he user account belongs. The last colum n specifies whet her t he user account is for an indiv idual user or a role. Figu r e 7 - 2 . Use t h e sp_ h e lplogin s syst e m st ore d pr oce d u r e t o le a rn a bou t a log in on a da t ab a se ser ve r .
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Arm ed w it h t he inform at ion in Figure 7- 2, y ou can const ruct a T- SQL script like t he follow ing t o r em ove t he vbdot net 1 secur it y account s fr om t he serv er. St art by inv ok ing t he sp_r ev okedbaccess syst em st ored procedure in each dat abase wit h a user account for t he vbdot net 1 login. Specify t he user account nam e as t he argum ent for t he sp_r evokedbaccess syst em st or ed procedur e. Not ice t hat t he script inv ok es sp_rev ok edbaccess t wice once in each dat abase for w hich t he vbdot net 1 login has a user account . The scr ipt closes by r unning t he sp_droplogin syst em st ored procedur e. This syst em st or ed pr ocedur e r equir es j ust one argum ent specify ing t he nam e of t he login t o r em ov e. The perm issions for rem ov ing user account s and logins m at ch t hose for adding t hem : a login at t em pt ing t o rem ov e a login m ust be a m em ber of t he sy sadm in or secur it yadm in fix ed ser ver r ole t o r un sp_droplogin. --Drop a SQL Server login, --first revoking its user accounts. USE Northwind
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EXEC sp_revokedbaccess vbdotnet1 USE 07 EXEC sp_revokedbaccess vbdotnet1 EXEC sp_droplogin @loginame = vbdotnet1
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