Access Denied SPPersistedObject.Update()

Firstly whenever you get Access denied error while you Updating SPPersistedObject then overide method in your Class like below

protected override bool HasAdditionalUpdateAccess()
{

return true;

}

then you will get exact error of access denied then apply below given steps.

Give Excecute permission to "WSS_Content_Application_Pools" .





below given procedure Name are

Permission	Stored Procedure	Database Role
EXECUTE	proc_putObject	WSS_Content_Application_Pools
EXECUTE	proc_putClass	WSS_Content_Application_Pools
EXECUTE	proc_dropObject	WSS_Content_Application_Pools
EXECUTE	proc_getNewObjects	WSS_Content_Application_Pools