How to find that who deleted SQL Server database

From very good post here from "Jack Corbett" - 

http://www.sqlservercentral.com/Forums/Topic989304-391-1.aspx

SharePoint sites : Access denied in chrome

Annoying right?

Works from Chrome Incognito but does't work with Chrome standard mode..

Just use following URL -
_layouts/closeConnection.aspx?loginasanotheruser=true

To close the current connection and loginasanother user.

https://support.microsoft.com/en-us/kb/2752600

Set App Permission using Powershell

Add-PSSnapin "Microsoft.SharePoint.PowerShell"
$spw = Get-SPSite "http://server.domain.com"
$clientID = "86e47e56-f289-4f68-b832-58b0542e0c96"
$authRealm = Get-SPAuthenticationRealm -ServiceContext $spw
$spAppId = $clientID + "@" + $authRealm
$spAppPrincipal = Get-SPAppPrincipal -Site $spw.RootWeb -NameIdentifier $spAppId
Set-SPAppPrincipalPermission -Site $spw.RootWeb -AppPrincipal $spAppPrincipal -Scope SiteSubscription -Right FullControl

FBA pack for SharePoint 2013

https://sharepoint2013fba.codeplex.com/documentation

A forms based authentication pack for SharePoint 2013. It includes web parts for registering users, changing passwords and password recovery. It includes tools for managing users and roles and for approving registrations. 

More details here for FBA management features-

https://sharepoint2013fba.codeplex.com/