-- ===================================================================================================================
-- Collector: QueryStoreCollector ("query-store")
-- ===================================================================================================================
-- Hvad:        Query Store i hver brugerdatabase, hvor det er slået til: de 100 tungeste queries over 8 dage og
--              forcerede planer, der fejler.
-- Fil:         src/SQLInsight.Collectors/Performance/QueryStoreCollector.cs
-- Databaser:   Fra 1.3 kun de databaser, der er valgt under Servere og databaser (systemdatabaserne altid; se
--              _collectors/DatabaseDiscovery.sql). Fravalgte databaser sorteres fra i koden efter forespørgslen; SQL'en er uændret.
-- Interval:    30 min som standard (SQLInsight:CollectorIntervals:query-store)
-- Versioner:   SQL Server 2016 og nyere
--
-- Rettigheder til agentens login (se db/permissions/grant-least-privilege.sql; [agent] = agentens login):
--   GRANT VIEW SERVER STATE TO [agent];                -- SQL Server 2005-2019
--   GRANT VIEW SERVER PERFORMANCE STATE TO [agent];    -- SQL Server 2022+ (erstatter VIEW SERVER STATE)
--   GRANT VIEW SERVER SECURITY STATE TO [agent];       -- SQL Server 2022+
--   GRANT VIEW ANY DEFINITION TO [agent];              -- metadata; giver IKKE adgang til data
--   GRANT CONNECT ANY DATABASE TO [agent];             -- SQL Server 2014+; giver IKKE adgang til data
--   Før 2014 i stedet, i hver brugerdatabase: CREATE USER [agent] FOR LOGIN [agent];
--
-- Bruges af:   SQLI-QS-001, SQLI-QS-002, SQLI-QS-003
-- Read-only:   Ja: kun SELECT samt lokale variabler, SET-sessionsindstillinger. Intet ændrer data, indstillinger
--              eller objekter.
-- Kørsel:     Kør i SSMS som agentens login. Hver variant er sin egen batch (GO); en variant for en anden SQL Server-version
--             end din kan fejle - det er forventet. Agenten kører altid med sessionsindstillingerne i _collectors/InstanceProbe.sql.
-- ===================================================================================================================

-- Variant: SQL Server 2016 og nyere
-- Kilde: QueryStoreCollector.DatabasesSql
-- Kode:  src/SQLInsight.Collectors/Performance/QueryStoreCollector.cs : QueryStoreCollector.DatabasesSql
SELECT name FROM sys.databases
WHERE is_query_store_on = 1 AND state = 0 AND database_id > 4
GO

-- Variant: SQL Server 2016 og nyere: én gang pr. database med Query Store (vist for msdb)
-- Kilde: QueryStoreCollector.BuildStatsSql
-- Kode:  src/SQLInsight.Collectors/Performance/QueryStoreCollector.cs : QueryStoreCollector.BuildStatsSql(database)
DECLARE @now datetimeoffset = SYSDATETIMEOFFSET();
DECLARE @recent datetimeoffset = DATEADD(hour, -24, @now);
DECLARE @history datetimeoffset = DATEADD(day, -8, @now);

WITH stats AS (
    SELECT p.query_id, p.plan_id,
           CASE WHEN i.start_time >= @recent THEN 1 ELSE 0 END AS is_recent,
           SUM(rs.count_executions) AS execs,
           SUM(rs.avg_duration * rs.count_executions) AS total_duration,
           SUM(rs.avg_cpu_time * rs.count_executions) AS total_cpu,
           SUM(rs.avg_logical_io_reads * rs.count_executions) AS total_reads,
           MAX(rs.stdev_duration) AS max_stdev_duration,
           MAX(rs.max_duration) AS max_duration,
           MIN(rs.min_duration) AS min_duration,
           MAX(rs.last_execution_time) AS last_execution
    FROM [msdb].sys.query_store_runtime_stats rs
    JOIN [msdb].sys.query_store_runtime_stats_interval i ON i.runtime_stats_interval_id = rs.runtime_stats_interval_id
    JOIN [msdb].sys.query_store_plan p ON p.plan_id = rs.plan_id
    WHERE i.start_time >= @history
    GROUP BY p.query_id, p.plan_id, CASE WHEN i.start_time >= @recent THEN 1 ELSE 0 END
), top_queries AS (
    SELECT TOP (100) query_id FROM stats GROUP BY query_id ORDER BY SUM(total_duration) DESC
)
SELECT s.query_id, s.plan_id, s.is_recent, s.execs, s.total_duration, s.total_cpu, s.total_reads,
       s.max_stdev_duration, s.max_duration, s.min_duration,
       CAST(SWITCHOFFSET(s.last_execution, '+00:00') AS datetime2(0)),
       p.is_forced_plan, LEFT(qt.query_sql_text, 2000),
       OBJECT_SCHEMA_NAME(q.object_id, DB_ID(N'msdb')) + N'.' + OBJECT_NAME(q.object_id, DB_ID(N'msdb'))
FROM stats s
JOIN top_queries t ON t.query_id = s.query_id
JOIN [msdb].sys.query_store_plan p ON p.plan_id = s.plan_id
JOIN [msdb].sys.query_store_query q ON q.query_id = s.query_id
JOIN [msdb].sys.query_store_query_text qt ON qt.query_text_id = q.query_text_id;
GO

-- Variant: SQL Server 2016 og nyere: én gang pr. database med Query Store (vist for msdb)
-- Kilde: QueryStoreCollector.BuildFailedForcedSql
-- Kode:  src/SQLInsight.Collectors/Performance/QueryStoreCollector.cs : QueryStoreCollector.BuildFailedForcedSql(database)
SELECT p.query_id, p.plan_id, p.force_failure_count, p.last_force_failure_reason_desc, LEFT(qt.query_sql_text, 2000)
FROM [msdb].sys.query_store_plan p
JOIN [msdb].sys.query_store_query q ON q.query_id = p.query_id
JOIN [msdb].sys.query_store_query_text qt ON qt.query_text_id = q.query_text_id
WHERE p.is_forced_plan = 1 AND p.force_failure_count > 0;
GO