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[经验分享] SQL Server 诊断查询-(3)

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发表于 2018-10-14 12:51:51 | 显示全部楼层 |阅读模式
  Query #27 Database Properties
  -- Recovery model, log reuse wait description, log file size, log usage size
  -- and compatibility level for all databases on instance
  SELECT db.[name] AS [Database Name], db.recovery_model_desc AS [Recovery Model], db.state_desc, db.containment_desc,
  db.log_reuse_wait_desc AS [Log Reuse Wait Description],
  CONVERT(DECIMAL(18,2), ls.cntr_value/1024.0) AS [Log Size (MB)], CONVERT(DECIMAL(18,2), lu.cntr_value/1024.0) AS [Log Used (MB)],
  CAST(CAST(lu.cntr_value AS FLOAT) / CAST(ls.cntr_value AS FLOAT)AS DECIMAL(18,2)) * 100 AS [Log Used %],
  db.[compatibility_level] AS [DB Compatibility Level], db.page_verify_option_desc AS [Page Verify Option],
  db.is_auto_create_stats_on, db.is_auto_update_stats_on, db.is_auto_update_stats_async_on, db.is_parameterization_forced,
  db.snapshot_isolation_state_desc, db.is_read_committed_snapshot_on, db.is_auto_close_on, db.is_auto_shrink_on,
  db.target_recovery_time_in_seconds, db.is_cdc_enabled, db.is_published, db.is_distributor, db.is_encrypted,
  db.group_database_id, db.replica_id,db.is_memory_optimized_elevate_to_snapshot_on,
  db.delayed_durability_desc, db.is_auto_create_stats_incremental_on,
  db.is_query_store_on, db.is_sync_with_backup,
  db.is_supplemental_logging_enabled, db.is_remote_data_archive_enabled
  FROM sys.databases AS db WITH (NOLOCK)
  INNER JOIN sys.dm_os_performance_counters AS lu WITH (NOLOCK)
  ON db.name = lu.instance_name
  INNER JOIN sys.dm_os_performance_counters AS ls WITH (NOLOCK)
  ON db.name = ls.instance_name
  WHERE lu.counter_name LIKE N'Log File(s) Used Size (KB)%'
  AND ls.counter_name LIKE N'Log File(s) Size (KB)%'
  AND ls.cntr_value > 0 OPTION (RECOMPILE);
  -- Things to look at:
  -- How many databases are on the instance?
  -- What recovery models are they using?
  -- What is the log reuse wait description?
  -- How full are the transaction logs?
  -- What compatibility level are the databases on?
  -- What is the Page Verify Option? (should be CHECKSUM)
  -- Is Auto Update Statistics Asynchronously enabled?
  -- Make sure auto_shrink and auto_close are not enabled!
  Query #28 Missing Indexes All Databases
  -- Missing Indexes for all databases by Index Advantage
  SELECT CONVERT(decimal(18,2), user_seeks * avg_total_user_cost * (avg_user_impact * 0.01)) AS [index_advantage],
  migs.last_user_seek, mid.[statement] AS [Database.Schema.Table],
  mid.equality_columns, mid.inequality_columns, mid.included_columns,
  migs.unique_compiles, migs.user_seeks, migs.avg_total_user_cost, migs.avg_user_impact,
  'CREATE INDEX [missing_index_'
  + CONVERT (VARCHAR,mig.index_group_handle) + '_'
  + CONVERT (VARCHAR,mid.index_handle) + '_'
  + LEFT(PARSENAME(mid.statement,1),32) + ']' + ' ON '
  +mid.statement
  + ' (' + ISNULL(mid.equality_columns, '')
  + CASE WHEN mid.equality_columns IS NOT NULL
  AND mid.inequality_columns IS NOT NULL THEN ','
  ELSE ''
  END + ISNULL(mid.inequality_columns, '') + ')'
  + ISNULL(' INCLUDE ('
  +mid.included_columns
  + ')', '')
  AS create_index_statement
  FROM sys.dm_db_missing_index_group_stats AS migs WITH (NOLOCK)
  INNER JOIN sys.dm_db_missing_index_groups AS mig WITH (NOLOCK)
  ON migs.group_handle = mig.index_group_handle
  INNER JOIN sys.dm_db_missing_index_details AS mid WITH (NOLOCK)
  ON mig.index_handle = mid.index_handle
  ORDER BY index_advantage DESC OPTION (RECOMPILE);
  -- Getting missing index information for all of the databases on the instance is very useful
  -- Look at last user seek time, number of user seeks to help determine source and importance
  -- Also look at avg_user_impact and avg_total_user_cost to help determine importance
  -- SQL Server is overly eager to add included columns, so beware
  -- Do not just blindly add indexes that show up from this query!!!
  Query #29 VLF Counts
  -- Get VLF Counts for all databases on the instance (Query 29) (VLF Counts)
  -- (adapted from Michelle Ufford)
  CREATE TABLE #VLFInfo (RecoveryUnitID int --FOR 2012 ONWARD, FileID  int,
  FileSize bigint, StartOffset bigint,
  FSeqNo      bigint, [Status]    bigint,
  Parity      bigint, CreateLSN   numeric(38));
  CREATE TABLE #VLFCountResults(DatabaseName sysname, VLFCount int);
  EXEC sp_MSforeachdb N'Use [?];
  INSERT INTO #VLFInfo
  EXEC sp_executesql N''DBCC LOGINFO([?])'';
  INSERT INTO #VLFCountResults
  SELECT DB_NAME(), COUNT(*)
  FROM #VLFInfo;
  TRUNCATE TABLE #VLFInfo;'
  SELECT DatabaseName, VLFCount
  FROM #VLFCountResults
  ORDER BY VLFCount DESC;
  DROP TABLE #VLFInfo;
  DROP TABLE #VLFCountResults;
  -- High VLF counts can affect write performance
  -- and they can make full database restores and crash recovery take much longer
  -- Try to keep your VLF counts under 200 in most cases (depending on log file size)
  -- Important change to VLF creation algorithm in SQL Server 2014
  -- http://www.sqlskills.com/blogs/paul/important-change-vlf-creation-algorithm-sql-server-2014/
  Query #30 CPU Usage by Database
  -- Get CPU utilization by database
  WITH DB_CPU_Stats
  AS
  (SELECT pa.DatabaseID, DB_Name(pa.DatabaseID) AS [Database Name], SUM(qs.total_worker_time/1000) AS [CPU_Time_Ms]
  FROM sys.dm_exec_query_stats AS qs WITH (NOLOCK)
  CROSS APPLY (SELECT CONVERT(int, value) AS [DatabaseID]
  FROM sys.dm_exec_plan_attributes(qs.plan_handle)
  WHERE attribute = N'dbid') AS pa
  GROUP BY DatabaseID)
  SELECT ROW_NUMBER() OVER(ORDER BY [CPU_Time_Ms] DESC) AS [CPU Rank],
  [Database Name], [CPU_Time_Ms] AS [CPU Time (ms)],
  CAST([CPU_Time_Ms] * 1.0 / SUM([CPU_Time_Ms]) OVER() * 100.0 AS DECIMAL(5, 2)) AS [CPU Percent]
  FROM DB_CPU_Stats
  WHERE DatabaseID  32767 -- ResourceDB
  ORDER BY [CPU Rank] OPTION (RECOMPILE);
  -- Helps determine which database is using the most CPU resources on the instance
  Query #31 IO Usage Usage by Database
  -- Get I/O utilization by database
  WITH Aggregate_IO_Statistics
  AS
  (SELECT DB_NAME(database_id) AS [Database Name],
  CAST(SUM(num_of_bytes_read + num_of_bytes_written)/1048576 AS DECIMAL(12, 2)) AS io_in_mb
  FROM sys.dm_io_virtual_file_stats(NULL, NULL) AS [DM_IO_STATS]
  GROUP BY database_id)
  SELECT ROW_NUMBER() OVER(ORDER BY io_in_mb DESC) AS [I/O Rank], [Database Name], io_in_mb AS [Total I/O (MB)],
  CAST(io_in_mb/ SUM(io_in_mb) OVER() * 100.0 AS DECIMAL(5,2)) AS [I/O Percent]
  FROM Aggregate_IO_Statistics
  ORDER BY [I/O Rank] OPTION (RECOMPILE);
  -- Helps determine which database is using the most I/O resources on the instance
  Query #32 Total Buffer Usage Usage by Database
  -- Get total buffer usage by database for current instance
  -- This make take some time to run on a busy instance
  WITH AggregateBufferPoolUsage
  AS
  (SELECT DB_NAME(database_id) AS [Database Name],
  CAST(COUNT(*) * 8/1024.0 AS DECIMAL (10,2))  AS [CachedSize]
  FROM sys.dm_os_buffer_descriptors WITH (NOLOCK)
  WHERE database_id  32767 -- ResourceDB
  GROUP BY DB_NAME(database_id))
  SELECT ROW_NUMBER() OVER(ORDER BY CachedSize DESC) AS [Buffer Pool Rank], [Database Name], CachedSize AS [Cached Size (MB)],
  CAST(CachedSize / SUM(CachedSize) OVER() * 100.0 AS DECIMAL(5,2)) AS [Buffer Pool Percent]
  FROM AggregateBufferPoolUsage
  ORDER BY [Buffer Pool Rank] OPTION (RECOMPILE);
  -- Tells you how much memory (in the buffer pool)
  -- is being used by each database on the instance
  Query #33 Top Waits
  -- Clear Wait Stats with this command
  -- DBCC SQLPERF('sys.dm_os_wait_stats', CLEAR);
  -- Isolate top waits for server instance since last restart or wait statistics clear  (Query 33) (Top Waits)
  WITH [Waits]
  AS (SELECT wait_type, wait_time_ms/ 1000.0 AS [WaitS],
  (wait_time_ms - signal_wait_time_ms) / 1000.0 AS [ResourceS],
  signal_wait_time_ms / 1000.0 AS [SignalS],
  waiting_tasks_count AS [WaitCount],
  100.0 *  wait_time_ms / SUM (wait_time_ms) OVER() AS [Percentage],
  ROW_NUMBER() OVER(ORDER BY wait_time_ms DESC) AS [RowNum]
  FROM sys.dm_os_wait_stats WITH (NOLOCK)
  WHERE [wait_type] NOT IN (
  N'BROKER_EVENTHANDLER', N'BROKER_RECEIVE_WAITFOR', N'BROKER_TASK_STOP',
  N'BROKER_TO_FLUSH', N'BROKER_TRANSMITTER', N'CHECKPOINT_QUEUE',
  N'CHKPT', N'CLR_AUTO_EVENT', N'CLR_MANUAL_EVENT', N'CLR_SEMAPHORE',
  N'DBMIRROR_DBM_EVENT', N'DBMIRROR_EVENTS_QUEUE', N'DBMIRROR_WORKER_QUEUE',
  N'DBMIRRORING_CMD', N'DIRTY_PAGE_POLL', N'DISPATCHER_QUEUE_SEMAPHORE',
  N'EXECSYNC', N'FSAGENT', N'FT_IFTS_SCHEDULER_IDLE_WAIT', N'FT_IFTSHC_MUTEX',
  N'HADR_CLUSAPI_CALL', N'HADR_FILESTREAM_IOMGR_IOCOMPLETION', N'HADR_LOGCAPTURE_WAIT',
  N'HADR_NOTIFICATION_DEQUEUE', N'HADR_TIMER_TASK', N'HADR_WORK_QUEUE',
  N'KSOURCE_WAKEUP', N'LAZYWRITER_SLEEP', N'LOGMGR_QUEUE',
  N'MEMORY_ALLOCATION_EXT', N'ONDEMAND_TASK_QUEUE',
  N'PREEMPTIVE_OS_LIBRARYOPS', N'PREEMPTIVE_OS_COMOPS', N'PREEMPTIVE_OS_CRYPTOPS',
  N'PREEMPTIVE_OS_PIPEOPS', N'PREEMPTIVE_OS_AUTHENTICATIONOPS',
  N'PREEMPTIVE_OS_GENERICOPS', N'PREEMPTIVE_OS_VERIFYTRUST',
  N'PREEMPTIVE_OS_FILEOPS', N'PREEMPTIVE_OS_DEVICEOPS',
  N'PWAIT_ALL_COMPONENTS_INITIALIZED', N'QDS_PERSIST_TASK_MAIN_LOOP_SLEEP',
  N'QDS_ASYNC_QUEUE',
  N'QDS_CLEANUP_STALE_QUERIES_TASK_MAIN_LOOP_SLEEP', N'REQUEST_FOR_DEADLOCK_SEARCH',
  N'RESOURCE_QUEUE', N'SERVER_IDLE_CHECK', N'SLEEP_BPOOL_FLUSH', N'SLEEP_DBSTARTUP',
  N'SLEEP_DCOMSTARTUP', N'SLEEP_MASTERDBREADY', N'SLEEP_MASTERMDREADY',
  N'SLEEP_MASTERUPGRADED', N'SLEEP_MSDBSTARTUP', N'SLEEP_SYSTEMTASK', N'SLEEP_TASK',
  N'SLEEP_TEMPDBSTARTUP', N'SNI_HTTP_ACCEPT', N'SP_SERVER_DIAGNOSTICS_SLEEP',
  N'SQLTRACE_BUFFER_FLUSH', N'SQLTRACE_INCREMENTAL_FLUSH_SLEEP', N'SQLTRACE_WAIT_ENTRIES',
  N'WAIT_FOR_RESULTS', N'WAITFOR', N'WAITFOR_TASKSHUTDOWN', N'WAIT_XTP_HOST_WAIT',
  N'WAIT_XTP_OFFLINE_CKPT_NEW_LOG', N'WAIT_XTP_CKPT_CLOSE', N'XE_DISPATCHER_JOIN',
  N'XE_DISPATCHER_WAIT', N'XE_LIVE_TARGET_TVF', N'XE_TIMER_EVENT')
  AND waiting_tasks_count > 0)
  SELECT
  MAX (W1.wait_type) AS [WaitType],
  CAST (MAX (W1.WaitS) AS DECIMAL (16,2)) AS [Wait_Sec],
  CAST (MAX (W1.ResourceS) AS DECIMAL (16,2)) AS [Resource_Sec],
  CAST (MAX (W1.SignalS) AS DECIMAL (16,2)) AS [Signal_Sec],
  MAX (W1.WaitCount) AS [Wait Count],
  CAST (MAX (W1.Percentage) AS DECIMAL (5,2)) AS [Wait Percentage],
  CAST ((MAX (W1.WaitS) / MAX (W1.WaitCount)) AS DECIMAL (16,4)) AS [AvgWait_Sec],
  CAST ((MAX (W1.ResourceS) / MAX (W1.WaitCount)) AS DECIMAL (16,4)) AS [AvgRes_Sec],
  CAST ((MAX (W1.SignalS) / MAX (W1.WaitCount)) AS DECIMAL (16,4)) AS [AvgSig_Sec]
  FROM Waits AS W1
  INNER JOIN Waits AS W2
  ON W2.RowNum

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