Exclusive - Locks in SQL Server - Part 5
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Exclusive (X) locks prevent access to a resource by concurrent transactions. With an exclusive (X) lock, no other transactions can modify data Repeatable read and Higher Isolation level transactions can’t read that locked data and Rest of the levels can read. No Lock hints Can read this data.
Isolation Level - • SQL Server Isolation Example
Script for Active_Locks Function
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Create Function Active_locks () returns table return
select Top 10000000 case dtl.request_session_id
when -2 then 'orphaned distributed transaction'
when -3 then 'deferred recovery transaction'
else dtl.request_session_id end as spid,
db_name(dtl.resource_database_id) as databasename,
so.name as lockedobjectname, dtl.resource_type as lockedresource,
dtl.request_mode as locktype, es.login_name as loginname, es.host_name as hostname,
case tst.is_user_transaction when 0 then 'system transaction'
when 1 then 'user transaction' end as user_or_system_transaction,
at.name as transactionname, dtl.request_status
from sys.dm_tran_locks dtl join sys.partitions sp on sp.hobt_id = dtl.resource_associated_entity_id
join sys.objects so on so.object_id = sp.object_id
join sys.dm_exec_sessions es on es.session_id = dtl.request_session_id
join sys.dm_tran_session_transactions tst on es.session_id = tst.session_id
join sys.dm_tran_active_transactions at on tst.transaction_id = at.transaction_id
join sys.dm_exec_connections ec on ec.session_id = es.session_id
cross apply sys.dm_exec_sql_text(ec.most_recent_sql_handle) as st
where resource_database_id = db_id() order by dtl.request_session_id
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