-- ===================================================================================================================
-- Collector: WaitSamplingCollector ("wait-sampling")
-- ===================================================================================================================
-- Hvad:        Active session sampling: hvad ventende brugerrequests venter på. Bruges af tidsvindue-analysen i
--              web-UI'et, ikke af nogen regel.
-- Fil:         src/SQLInsight.Collectors/Performance/WaitSamplingCollector.cs
-- Interval:    15 sek som standard (SQLInsight:CollectorIntervals:wait-sampling)
-- Versioner:   SQL Server 2005 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+
--
-- Bruges af:   Ingen regel (kun web-UI'ets analyse).
-- Read-only:   Ja: kun SELECT samt 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 2008 og nyere
-- Kilde: WaitSamplingCollector.Sql2008
-- Kode:  src/SQLInsight.Collectors/Performance/WaitSamplingCollector.cs : WaitSamplingCollector.Sql2008
SELECT r.session_id, r.wait_type, r.wait_time, DB_NAME(r.database_id), r.blocking_session_id,CASE WHEN r.query_hash IS NULL OR r.query_hash = 0x0000000000000000 THEN NULL ELSE CONVERT(varchar(20), r.query_hash, 1) END,
CAST(SUBSTRING(st.text, r.statement_start_offset / 2 + 1,
     CASE WHEN r.statement_end_offset = -1 THEN 4000 ELSE (r.statement_end_offset - r.statement_start_offset) / 2 + 1 END) AS nvarchar(4000))
FROM sys.dm_exec_requests r
JOIN sys.dm_exec_sessions s ON s.session_id = r.session_id
OUTER APPLY sys.dm_exec_sql_text(r.sql_handle) st
WHERE s.is_user_process = 1 AND r.session_id <> @@SPID AND r.wait_type IS NOT NULL
  AND (s.program_name IS NULL OR s.program_name NOT LIKE N'SQLInsight Pro%')
GO

-- Variant: SQL Server 2005
-- Kilde: WaitSamplingCollector.Sql2005
-- Kode:  src/SQLInsight.Collectors/Performance/WaitSamplingCollector.cs : WaitSamplingCollector.Sql2005
SELECT r.session_id, r.wait_type, r.wait_time, DB_NAME(r.database_id), r.blocking_session_id,CASE WHEN r.sql_handle IS NULL THEN NULL
     ELSE sys.fn_varbintohexstr(r.sql_handle) + ':' + CAST(r.statement_start_offset AS varchar(12)) + ':' + CAST(r.statement_end_offset AS varchar(12)) END,
CAST(SUBSTRING(st.text, r.statement_start_offset / 2 + 1,
     CASE WHEN r.statement_end_offset = -1 THEN 4000 ELSE (r.statement_end_offset - r.statement_start_offset) / 2 + 1 END) AS nvarchar(4000))
FROM sys.dm_exec_requests r
JOIN sys.dm_exec_sessions s ON s.session_id = r.session_id
OUTER APPLY sys.dm_exec_sql_text(r.sql_handle) st
WHERE s.is_user_process = 1 AND r.session_id <> @@SPID AND r.wait_type IS NOT NULL
  AND (s.program_name IS NULL OR s.program_name NOT LIKE N'SQLInsight Pro%')
GO