mssql数据库系统日常维护关键信息提取 转

--1. 首先我们来看一下目前数据库系统所有请求情况.sql
SELECT s.session_id,
       s.status,
       DB_NAME(r.database_id) AS database_name,
       s.login_name,
       s.login_time,
       s.host_name,
       c.client_net_address,
       c.client_tcp_port,
       s.program_name,
       r.cpu_time,
       r.reads,
       r.writes,
       c.num_reads,
       c.num_writes,
       s.client_interface_name,
       s.last_request_start_time,
       s.last_request_end_time,
       c.connect_time,
       c.net_transport,
       c.net_packet_size,
       r.start_time,
       r.status,
       r.command,
       r.blocking_session_id,
       r.wait_type,
       r.wait_time,
       r.last_wait_type,
       r.wait_resource,
       r.open_transaction_count,
       r.percent_complete,
       r.granted_query_memory
FROM   Sys.dm_exec_requests r WITH(NOLOCK)
       RIGHT OUTER JOIN Sys.dm_exec_sessions s WITH(NOLOCK)
            ON  r.session_id = s.session_id
       RIGHT OUTER JOIN Sys.dm_exec_connections c WITH(NOLOCK)
            ON  s.session_id = c.session_id
WHERE  s.session_id > 50
ORDER BY
       s.session_id
--2. 哪个用户连接数最多.sql
SELECT login_name,
       COUNT(0) user_count
FROM   Sys.dm_exec_requests r WITH(NOLOCK)
       RIGHT OUTER JOIN Sys.dm_exec_sessions s WITH(NOLOCK)
            ON  r.session_id = s.session_id
       RIGHT OUTER JOIN Sys.dm_exec_connections c WITH(NOLOCK)
            ON  s.session_id = c.session_id
WHERE  s.session_id > 50group BY login_name
ORDER BY
       2 DESC
--3. 哪台机器发起到数据库的连接数最多.sql
SELECT s.host_name,
       c.client_net_address,
       COUNT(0) host_count
FROM   Sys.dm_exec_requests r WITH(NOLOCK)
       RIGHT OUTER JOIN Sys.dm_exec_sessions s WITH(NOLOCK)
            ON  r.session_id = s.session_id
       RIGHT OUTER JOIN Sys.dm_exec_connections c WITH(NOLOCK)
            ON  s.session_id = c.session_id
WHERE  s.session_id > 50group BY HOST_NAME,client_net_address
ORDER BY
       3 DESC
--4. 这些连接在访问哪个库.sql
SELECT DB_NAME(r.database_id) AS database_name,
       COUNT(0) host_count
FROM   Sys.dm_exec_requests r WITH(NOLOCK)
       RIGHT OUTER JOIN Sys.dm_exec_sessions s WITH(NOLOCK)
            ON  r.session_id = s.session_id
       RIGHT OUTER JOIN Sys.dm_exec_connections c WITH(NOLOCK)
            ON  s.session_id = c.session_id
WHERE  s.session_id > 50group BY r.database_id
ORDER BY
       2 DESC
--5. 进程状态running数比较多，表面数据库压力比较大.sql
SELECT s.status,
       COUNT(0) host_count
FROM   Sys.dm_exec_requests r WITH(NOLOCK)
       RIGHT OUTER JOIN Sys.dm_exec_sessions s WITH(NOLOCK)
            ON  r.session_id = s.session_id
       RIGHT OUTER JOIN Sys.dm_exec_connections c WITH(NOLOCK)
            ON  s.session_id = c.session_id
WHERE  s.session_id > 50group BY s.status
ORDER BY
       2 DESC
--1. 查看数据库阻塞情况.sql
SELECT t1.resource_type AS [lock type],
       DB_NAME(resource_database_id) AS [database],
       t1.resource_associated_entity_id AS [blk object],
       t1.request_mode AS [lock req] -- lock requested   
       ,
       t1.request_session_id AS [waiter sid] -- spid of waiter
       ,
       t2.wait_duration_ms AS [wait time],
       (
           SELECT TEXT
           FROM   sys.dm_exec_requests AS r WITH(NOLOCK) --- get sql for waiter    
                  
                  CROSS APPLY sys.dm_exec_sql_text(r.sql_handle)
           WHERE  r.session_id = t1.request_session_id
       ) AS waiter_batch,
       (
           SELECT SUBSTRING(
                      qt.text,
                      r.statement_start_offset / 2,
                      (
                          CASE 
                               WHEN r.statement_end_offset = -1 THEN LEN(CONVERT(NVARCHAR(MAX), qt.text)) 
                                    * 2
                               ELSE r.statement_end_offset
                          END - r.statement_start_offset
                      ) / 2 + 1
                  )
           FROM   sys.dm_exec_requests AS r WITH(NOLOCK)
                  CROSS APPLY sys.dm_exec_sql_text(r.sql_handle) AS qt
           WHERE  r.session_id = t1.request_session_id
       ) AS waiter_stmt --- statement executing now    
       ,
       t2.blocking_session_id AS [blocker sid] --- spid of blocker 
       ,
       (
           SELECT TEXT
           FROM   sys.sysprocesses AS p WITH(NOLOCK) --- get sql for blocker    
                  
                  CROSS APPLY sys.dm_exec_sql_text(p.sql_handle)
           WHERE  p.spid = t2.blocking_session_id
       ) AS blocker_stmt,
       GETDATE() TIME
FROM   sys.dm_tran_locks AS t1 WITH(NOLOCK),
       sys.dm_os_waiting_tasks AS t2 WITH(NOLOCK)
WHERE  t1.lock_owner_address = t2.resource_address

--2. 查看阻塞其他进程的进程（阻塞源头）.sql
SELECT t2.blocking_session_id,
       COUNT(0) counts
FROM   sys.dm_tran_locks AS t1 WITH(NOLOCK),
       sys.dm_os_waiting_tasks AS t2 WITH(NOLOCK)
WHERE  t1.lock_owner_address = t2.resource_address
GROUP BY
       blocking_session_id
ORDER BY
       2
--3. 被阻塞时间最长的进程.sql
SELECT TOP 10 t1.resource_type AS [lock type],
       DB_NAME(resource_database_id) AS [database],
       t1.resource_associated_entity_id AS [blk object],
       t1.request_mode AS [lock req] -- lock requested    

       ,t1.request_session_id as [waiter sid]                      -- spid of waiter   
       ,
       t2.wait_duration_ms AS [wait time],
       (
           SELECT TEXT
           FROM   sys.dm_exec_requests AS r WITH(NOLOCK) --- get sql for waiter    
                  
                  CROSS APPLY sys.dm_exec_sql_text(r.sql_handle)
           WHERE  r.session_id = t1.request_session_id
       ) AS waiter_batch,
       (
           SELECT SUBSTRING(
                      qt.text,
                      r.statement_start_offset / 2,
                      (
                          CASE 
                               WHEN r.statement_end_offset = -1 THEN LEN(CONVERT(NVARCHAR(MAX), qt.text)) 
                                    * 2
                               ELSE r.statement_end_offset
                          END - r.statement_start_offset
                      ) / 2 + 1
                  )
           FROM   sys.dm_exec_requests AS r WITH(NOLOCK)
                  CROSS APPLY sys.dm_exec_sql_text(r.sql_handle) AS qt
           WHERE  r.session_id = t1.request_session_id
       ) AS waiter_stmt --- statement executing now   
       ,t2.blocking_session_id as [blocker sid]                --- spid of blocker   
       ,
       (
           SELECT TEXT
           FROM   sys.sysprocesses AS p WITH(NOLOCK) --- get sql for blocker   
                  
                  CROSS APPLY sys.dm_exec_sql_text(p.sql_handle)
           WHERE  p.spid = t2.blocking_session_id
       ) AS blocker_stmt,
       GETDATE() TIME
FROM   sys.dm_tran_locks AS t1 WITH(NOLOCK),
       sys.dm_os_waiting_tasks AS t2 WITH(NOLOCK)
WHERE  t1.lock_owner_address = t2.resource_address
ORDER BY
       t2.wait_duration_ms DESC