From 0dde15e015e93d4dbfc7b0d7e6e717ff59c305ff Mon Sep 17 00:00:00 2001
From: Eitan Blumin <eitan@madeiradata.com>
Date: Tue, 19 Mar 2024 21:06:50 +0200
Subject: [PATCH] adding sp_AnalyzeQueryStatistics and sp_AnalyzeQueryIndex

---
 Utility Scripts/sp_AnalyzeQueryIndex.sql      | 52 +++++++++++++++++++
 Utility Scripts/sp_AnalyzeQueryStatistics.sql | 37 +++++++++++++
 2 files changed, 89 insertions(+)
 create mode 100644 Utility Scripts/sp_AnalyzeQueryIndex.sql
 create mode 100644 Utility Scripts/sp_AnalyzeQueryStatistics.sql

diff --git a/Utility Scripts/sp_AnalyzeQueryIndex.sql b/Utility Scripts/sp_AnalyzeQueryIndex.sql
new file mode 100644
index 0000000..9ca7e81
--- /dev/null
+++ b/Utility Scripts/sp_AnalyzeQueryIndex.sql	
@@ -0,0 +1,52 @@
+/*
+This procedure, when executed against a problematic SQL query, provides insights into missing indexes that could improve query performance.
+Source: https://techcommunity.microsoft.com/t5/azure-database-support-blog/lesson-learned-481-query-performance-analysis-tips/ba-p/4088795
+*/
+CREATE PROCEDURE sp_AnalyzeQueryIndex
+    @SQLQuery NVARCHAR(MAX)
+AS
+BEGIN
+    SET NOCOUNT ON;
+
+    DECLARE @TableNames TABLE (
+        SourceSchema NVARCHAR(128),
+        TableName NVARCHAR(128),
+        ObjectId INT
+    );
+
+    INSERT INTO @TableNames (SourceSchema, TableName, ObjectId)
+    SELECT DISTINCT
+        source_schema AS SourceSchema,
+        source_table AS TableName,
+        OBJECT_ID(source_schema + '.' + source_table) AS ObjectId
+    FROM
+        sys.dm_exec_describe_first_result_set(@SQLQuery, NULL, 1) sp
+    WHERE sp.error_number IS NULL AND NOT sp.source_table IS NULL
+
+    SELECT
+        t.TableName,
+        migs.group_handle,
+        migs.unique_compiles,
+        migs.user_seeks,
+        migs.user_scans,
+        migs.last_user_seek,
+        migs.last_user_scan,
+        mid.statement,
+        mid.equality_columns,
+        mid.inequality_columns,
+        mid.included_columns
+    FROM
+        @TableNames AS t
+    INNER JOIN
+        sys.dm_db_missing_index_groups mig ON mig.index_handle IN (
+            SELECT index_handle
+            FROM sys.dm_db_missing_index_details
+            WHERE object_id = t.ObjectId
+        )
+    INNER JOIN
+        sys.dm_db_missing_index_group_stats migs ON migs.group_handle = mig.index_group_handle
+    INNER JOIN
+        sys.dm_db_missing_index_details mid ON mig.index_handle = mid.index_handle
+    WHERE
+        mid.database_id = DB_ID();
+END;
diff --git a/Utility Scripts/sp_AnalyzeQueryStatistics.sql b/Utility Scripts/sp_AnalyzeQueryStatistics.sql
new file mode 100644
index 0000000..72c1a0d
--- /dev/null
+++ b/Utility Scripts/sp_AnalyzeQueryStatistics.sql	
@@ -0,0 +1,37 @@
+/*
+This procedure is designed to take a SQL query as input, specified through the @SQLQuery parameter, and dissect it to unveil the underlying schema and tables it interacts with.
+Source: https://techcommunity.microsoft.com/t5/azure-database-support-blog/lesson-learned-481-query-performance-analysis-tips/ba-p/4088795
+*/
+CREATE PROCEDURE sp_AnalyzeQueryStatistics
+    @SQLQuery NVARCHAR(MAX)
+AS
+BEGIN
+    SET NOCOUNT ON;
+
+    DECLARE @TableNames TABLE (
+        SourceSchema NVARCHAR(128),
+        TableName NVARCHAR(128)
+    );
+
+    INSERT INTO @TableNames (SourceSchema, TableName)
+    SELECT DISTINCT
+        source_schema AS SourceSchema,
+        source_table AS TableName
+    FROM
+        sys.dm_exec_describe_first_result_set(@SQLQuery, NULL, 1) sp
+		WHERE sp.error_number IS NULL AND NOT sp.source_table is NULL
+
+    SELECT
+        t.TableName,
+        s.name AS StatisticName,
+        STATS_DATE(s.object_id, s.stats_id) AS LastUpdated,
+        sp.rows,
+        sp.rows_sampled,
+        sp.modification_counter
+    FROM
+        @TableNames AS t
+    INNER JOIN
+        sys.stats AS s ON s.object_id = OBJECT_ID(QUOTENAME(t.SourceSchema) + '.' + QUOTENAME(t.TableName))
+    CROSS APPLY
+        sys.dm_db_stats_properties(s.object_id, s.stats_id) AS sp;
+END;