Small change 🧷

SQL Queries/Data Warehouse/DW_Events_ByTotalEvents.sql

@@ -3,11 +3,11 @@
 --
 -- Description: 
 -- This SQL script retrieves the top 100 most common events from the event logging system, providing 
--- insights into the events that occur most frequently. The query returns the event display number, raw description 
--- of the event, the computer name where the event was logged, and the total number of occurrences of each event. 
--- Additionally, it calculates the span of days over which each event has been logged, helping identify long-running 
--- or persistent issues. This query is designed to assist in identifying patterns or anomalies in event logs, particularly 
--- useful in large-scale environments where understanding event noise and distribution can aid in proactive management and troubleshooting.
+-- insights into the events that occur most frequently. The query returns the event display number, the rendered 
+-- description of the event, the computer name where the event was logged, and the total number of occurrences 
+-- of each event. Additionally, it calculates the span of days over which each event has been logged, helping 
+-- identify long-running or persistent issues. This query is especially useful in large-scale environments 
+-- where understanding event noise and distribution can aid in proactive management and troubleshooting.
 --
 -- Author: Blake Drumm (blakedrumm@microsoft.com)
 -- Date Created: May 7th, 2024
@@ -16,22 +16,27 @@
 ----------------------------------------------------------------------------------------------------------------
 -- Selects the top 100 records from the result set
 SELECT TOP 100
-    evt.EventDisplayNumber,            -- Display number of the event
-    evtd.RenderedDescription,               -- Raw description of the event
-    evtlc.ComputerName,                -- Name of the computer logging the event
-    COUNT(*) AS TotalEvents,           -- Total number of events aggregated by display number, description, and computer name
+    evt.EventDisplayNumber,                -- Display number of the event
+    evtd.RenderedDescription,              -- Rendered description of the event
+    evtlc.ComputerName,                    -- Name of the computer logging the event
+    COUNT(*) AS TotalEvents,               -- Total number of events aggregated by display number, description, and computer name
     DATEDIFF(DAY, MIN(evt.DateTime), MAX(evt.DateTime)) + 1 AS DaysOfData  -- Calculates the span of days between the earliest and latest event dates for each group
 FROM 
-    Event.vEvent AS evt                -- From the main events table
+    Event.vEvent AS evt                    -- From the main events table
 INNER JOIN 
-    Event.vEventDetail AS evtd         -- Joined with event details on EventOriginId
+    Event.vEventDetail AS evtd             -- Joined with event details on EventOriginId
     ON evt.EventOriginId = evtd.EventOriginId
 INNER JOIN 
-    vEventLoggingComputer AS evtlc     -- Joined with the event logging computer table on LoggingComputerRowId
+    vEventLoggingComputer AS evtlc         -- Joined with the event logging computer table on LoggingComputerRowId
     ON evt.LoggingComputerRowId = evtlc.EventLoggingComputerRowId
+/*
+WHERE 
+    evt.DateTime > GETUTCDATE()        -- Filters to include only events with dates greater than now
+*/
 GROUP BY 
-    evt.EventDisplayNumber,            -- Groups the results by event display number,
-    evtd.RenderedDescription,               -- raw event description,
-    evtlc.ComputerName                 -- and computer name
+    evt.EventDisplayNumber,                
+    evtd.RenderedDescription,              -- Rendered event description
+    evtlc.ComputerName                     -- and computer name
 ORDER BY 
-    TotalEvents DESC                   -- Orders the results by the total number of events, in descending order
+    DaysOfData DESC,                       -- Orders the results by the span of days, descending
+    TotalEvents DESC                       -- and then by the total number of events, descending