Difference between Update() and SystemUpdate() in SharePoint

using (SPSite oSite= new SPSite(SPContext.Current.Site.Url"))

{

using (SPWeb oWeb = oSite.OpenWeb())

{

SPList oList = oWeb.Lists.TryGetList("MyListName");

SPListItem oListItem = oList.Items.Add();

oListItem["Column1"] = "Value1";

oListItem["Column2"] = "Value2";

oListItem.Update();

//oListItem.SystemUpdate();

//oListItem.SystemUpdate(true);

//oListItem.SystemUpdate(false);

}

}

--->In the above code,oListItem.Update()will update the “MyListName” data. This will also update the built in columns “Modified” and “Modified By”

--->oListItem.SystemUpdate(),this will update the “MyListName” databut not the built in columns “Modified” and “Modified By”.

--->oListItem.SystemUpdate(true),this will update the “MyListName” data but not the built in columns “Modified” and “Modified By”.But it will increment the item version
---->oListItem.SystemUpdate(false),this will update the “MyListName” data but not the built in columns “Modified” and “Modified By”. Also, does not increment the item verision

SystemUpdate will trigger all the list events if any and also the changes can be observed in Audit logs. Only alerts will not be triggered that are configured on the list..

If we are using SharePoint Object Model, as per the business needs we have to use any of the Methods.
But,if we are using client object model only Update method will be available, SystemUpdate method will not be available.

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