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Database
for page and row count
select object_name(object_id) as objname, * from sys.dm_db_partition_stats order by 1
Execution--- (when sql server is restart everything is reset)
sys.dm_exec_sessions
-- info about all active user connections and internal tasks
sys.dm_exec_connections
-- info about connections established
sys.dm_exec_requests
-- info about each request that is executing (including all system processes)
Execution--- Query plans
sys.dm_exec_sql_text
--returns text of sql batch
sys.dm_exec_query_plan
--returns showplan in xml
select * from sys.dm_exec_query_stats
-- returns stats for cached query plans
sys.dm_exec_cached_plans
--each query plan that is cached
Exection -- example
select * from dm_exec_connections cross apply
sys.dm_exec_sql_text(most_recent_sql_handle)
select * from dm_exec_requests cross apply
sys.dm_exec_sql_text(sql_handle)
Select T.[text],p.[query_plan], s.[program_name],s.host_name, s.client_interface_name,
s.login_name, r.* from sys_dm_exec_requests r inner join sys.dm_exec_sessions S
ONs.session_id = r.session_id
cross apply sql_text cross apply sys.dm_execsql_query_plan
select usecounts, cacheobjype, objtype, text from sys.dm_exec_cached_plans
cross apply dm_exec_sql_text(plan_handle)
where usecounts > 1
order by use cuonts desc
IO
select * sys.dm_io_pending_io_requests can be run when you think that io can be a bottleneck
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select * from sys.dm_io_virtual_file_stats (null,null)
select db_name(database_id), * from
sys.dm_io_virtual_file_stats(null,null)
shows io stats for data and log files -- database id and
file id -- null returns all data
db_name is a funtion to return the name of the actual
database rather than database id
Index (when sql server is restart everything is reset)
sys.dm_dm_db_index_operational_stats (DMF)
-- shows io, locking and access information such as inserts, deletes, updates
sys.dm_dm_db_index_physical_stats (DMF)
-- shows index storage and fragmaentation info,
sys.dm_dm_db_index_usage_stats (DMV)
-- shows how often indexes are used and for what type of SQL operation
Index examples
select db_name(dtabase_id), object_name(), * from
operation_stats(5,null,null,null)
parameters
databaseid, objectid, indexid, partition number
select db_name(dtabase_id), object_name(), * from
physical_stats(DB_ID(N'Northwind'),5,null,null,null, detaled)
parameters
databaseid, objectid, indexid, partition number, mode
Missing indexes
sys.dm_db_missing_index_details
sys.dm_db_missing_index_groups
sys.dm_db_missing_index_group_stats
sys.dm_db_missing_index_columns
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SQL Operating system
sys.dm_os_schedulers
-- information abt processors
sys.dm_os_sys_info
-- info abt computer and abt resources available to and consumed by sql server
sys.dm_os_sys_memory
-- how memory is used overall on the server, and how much memory is available.
sys.dm_os_wait_stats
-- info abt all waits
DBCC SQLPERF('sys.dm_os_wait_stats', CLEAR)
sys.dm_os_buffer_descriptors
-- info abt all data pages that are currently in the sql server buffer pool
memory use by database
memory use by table
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