-- ===================================================================================================================
-- Collector: IndexCollector ("indexes")
-- ===================================================================================================================
-- Hvad:        Index-inventar med brug, manglende index-forslag og statistikker for hver læsbar brugerdatabase. Kun
--              metadata og DMV'er; ingen tabeldata, ingen scanning.
-- Fil:         src/SQLInsight.Collectors/Databases/IndexCollector.cs
-- Interval:    6 timer som standard (SQLInsight:CollectorIntervals:indexes)
-- 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+
--   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-IDX-001, SQLI-IDX-002, SQLI-IDX-003, SQLI-IDX-004, SQLI-STAT-001
-- 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: starttidspunkt
-- Kilde: IndexCollector.StartTimeSql(2008+)
-- Kode:  src/SQLInsight.Collectors/Db.cs : Db.StartTimeSql(version)
SELECT (SELECT sqlserver_start_time FROM sys.dm_os_sys_info)
GO

-- Variant: SQL Server 2005: starttidspunkt
-- Kilde: IndexCollector.StartTimeSql(2005)
-- Kode:  src/SQLInsight.Collectors/Db.cs : Db.StartTimeSql(version)
SELECT (SELECT create_date FROM sys.databases WHERE database_id = 2)
GO

-- Variant: SQL Server 2005 og nyere
-- Kilde: IndexCollector.DatabasesSql
-- Kode:  src/SQLInsight.Collectors/Databases/IndexCollector.cs : IndexCollector.DatabasesSql
SELECT d.name FROM sys.databases d
WHERE d.state = 0 AND d.database_id > 4 AND HAS_DBACCESS(d.name) = 1
  AND NOT EXISTS (SELECT 1 FROM sys.database_mirroring m WHERE m.database_id = d.database_id AND m.mirroring_role = 2)
GO

-- Variant: SQL Server 2005 og nyere
-- Kilde: IndexCollector.MissingSql
-- Kode:  src/SQLInsight.Collectors/Databases/IndexCollector.cs : IndexCollector.MissingSql
SELECT DB_NAME(d.database_id), d.statement, d.equality_columns, d.inequality_columns, d.included_columns,
       gs.user_seeks, gs.user_scans, gs.avg_total_user_cost, gs.avg_user_impact, gs.last_user_seek
FROM sys.dm_db_missing_index_details d
JOIN sys.dm_db_missing_index_groups g ON g.index_handle = d.index_handle
JOIN sys.dm_db_missing_index_group_stats gs ON gs.group_handle = g.index_group_handle
GO

-- Variant: SQL Server 2008 og nyere: én gang pr. database (vist for msdb)
-- Kilde: IndexCollector.BuildIndexSql(2008+)
-- Kode:  src/SQLInsight.Collectors/Databases/IndexCollector.cs : IndexCollector.BuildIndexSql(database, filteredIndexes: true)
SELECT s.name, o.name, i.index_id, i.name, i.type_desc, i.is_unique, i.is_primary_key, i.is_unique_constraint, i.is_disabled,
       i.filter_definition,
       STUFF((SELECT NCHAR(57344) + c.name + CASE WHEN ic.is_descending_key = 1 THEN N' DESC' ELSE N'' END
       FROM [msdb].sys.index_columns ic JOIN [msdb].sys.columns c ON c.object_id = ic.object_id AND c.column_id = ic.column_id
       WHERE ic.object_id = i.object_id AND ic.index_id = i.index_id AND ic.is_included_column = 0
         AND ic.key_ordinal > 0
       ORDER BY ic.key_ordinal
       FOR XML PATH(''), TYPE).value('.', 'nvarchar(max)'), 1, 1, N''),
       STUFF((SELECT NCHAR(57344) + c.name + CASE WHEN ic.is_descending_key = 1 THEN N' DESC' ELSE N'' END
       FROM [msdb].sys.index_columns ic JOIN [msdb].sys.columns c ON c.object_id = ic.object_id AND c.column_id = ic.column_id
       WHERE ic.object_id = i.object_id AND ic.index_id = i.index_id AND ic.is_included_column = 1
         
       ORDER BY c.name
       FOR XML PATH(''), TYPE).value('.', 'nvarchar(max)'), 1, 1, N''),
       ps.row_count, ps.used_pages,
       us.user_seeks, us.user_scans, us.user_lookups, us.user_updates,
       fw.forwarded
FROM [msdb].sys.indexes i
JOIN [msdb].sys.objects o ON o.object_id = i.object_id AND o.type = 'U' AND o.is_ms_shipped = 0
JOIN [msdb].sys.schemas s ON s.schema_id = o.schema_id
OUTER APPLY (SELECT SUM(p.row_count) AS row_count, SUM(p.used_page_count) AS used_pages
             FROM [msdb].sys.dm_db_partition_stats p WHERE p.object_id = i.object_id AND p.index_id = i.index_id) ps
LEFT JOIN sys.dm_db_index_usage_stats us ON us.database_id = DB_ID(N'msdb') AND us.object_id = i.object_id AND us.index_id = i.index_id
OUTER APPLY (SELECT SUM(os.forwarded_fetch_count) AS forwarded
             FROM sys.dm_db_index_operational_stats(DB_ID(N'msdb'), i.object_id, 0, NULL) os WHERE i.index_id = 0) fw;
GO

-- Variant: SQL Server 2005: én gang pr. database (vist for msdb)
-- Kilde: IndexCollector.BuildIndexSql(2005)
-- Kode:  src/SQLInsight.Collectors/Databases/IndexCollector.cs : IndexCollector.BuildIndexSql(database, filteredIndexes: false)
SELECT s.name, o.name, i.index_id, i.name, i.type_desc, i.is_unique, i.is_primary_key, i.is_unique_constraint, i.is_disabled,
       CAST(NULL AS nvarchar(max)),
       STUFF((SELECT NCHAR(57344) + c.name + CASE WHEN ic.is_descending_key = 1 THEN N' DESC' ELSE N'' END
       FROM [msdb].sys.index_columns ic JOIN [msdb].sys.columns c ON c.object_id = ic.object_id AND c.column_id = ic.column_id
       WHERE ic.object_id = i.object_id AND ic.index_id = i.index_id AND ic.is_included_column = 0
         AND ic.key_ordinal > 0
       ORDER BY ic.key_ordinal
       FOR XML PATH(''), TYPE).value('.', 'nvarchar(max)'), 1, 1, N''),
       STUFF((SELECT NCHAR(57344) + c.name + CASE WHEN ic.is_descending_key = 1 THEN N' DESC' ELSE N'' END
       FROM [msdb].sys.index_columns ic JOIN [msdb].sys.columns c ON c.object_id = ic.object_id AND c.column_id = ic.column_id
       WHERE ic.object_id = i.object_id AND ic.index_id = i.index_id AND ic.is_included_column = 1
         
       ORDER BY c.name
       FOR XML PATH(''), TYPE).value('.', 'nvarchar(max)'), 1, 1, N''),
       ps.row_count, ps.used_pages,
       us.user_seeks, us.user_scans, us.user_lookups, us.user_updates,
       fw.forwarded
FROM [msdb].sys.indexes i
JOIN [msdb].sys.objects o ON o.object_id = i.object_id AND o.type = 'U' AND o.is_ms_shipped = 0
JOIN [msdb].sys.schemas s ON s.schema_id = o.schema_id
OUTER APPLY (SELECT SUM(p.row_count) AS row_count, SUM(p.used_page_count) AS used_pages
             FROM [msdb].sys.dm_db_partition_stats p WHERE p.object_id = i.object_id AND p.index_id = i.index_id) ps
LEFT JOIN sys.dm_db_index_usage_stats us ON us.database_id = DB_ID(N'msdb') AND us.object_id = i.object_id AND us.index_id = i.index_id
OUTER APPLY (SELECT SUM(os.forwarded_fetch_count) AS forwarded
             FROM sys.dm_db_index_operational_stats(DB_ID(N'msdb'), i.object_id, 0, NULL) os WHERE i.index_id = 0) fw;
GO

-- Variant: SQL Server 2005 og nyere: én gang pr. database (vist for msdb)
-- Kilde: IndexCollector.BuildStatisticsSql
-- Kode:  src/SQLInsight.Collectors/Databases/IndexCollector.cs : IndexCollector.BuildStatisticsSql(database)
SELECT s.name, o.name, si.name, STATS_DATE(si.id, si.indid),
       COALESCE((SELECT TOP 1 t.rowcnt FROM [msdb].sys.sysindexes t WHERE t.id = si.id AND t.indid IN (0, 1)), si.rowcnt), si.rowmodctr
FROM [msdb].sys.sysindexes si
JOIN [msdb].sys.objects o ON o.object_id = si.id AND o.type = 'U' AND o.is_ms_shipped = 0
JOIN [msdb].sys.schemas s ON s.schema_id = o.schema_id
WHERE si.indid > 0 AND si.indid < 255;
GO