Merge pull request #374 from dbt-msft/more-nolocks

add nolock to more metadata calls to avoid deadlocks

Author: sdebruyn

dbt/include/sqlserver/macros/adapters/apply_grants.sql

@@ -2,7 +2,7 @@
     select
         GRANTEE as grantee,
         PRIVILEGE_TYPE as privilege_type
-    from INFORMATION_SCHEMA.TABLE_PRIVILEGES
+    from INFORMATION_SCHEMA.TABLE_PRIVILEGES with (nolock)
     where TABLE_CATALOG = '{{ relation.database }}'
       and TABLE_SCHEMA = '{{ relation.schema }}'
       and TABLE_NAME = '{{ relation.identifier }}'

dbt/include/sqlserver/macros/adapters/columns.sql

@@ -9,8 +9,8 @@
             c.max_length as character_maximum_length,
             c.precision as numeric_precision,
             c.scale as numeric_scale
-        from [{{ 'tempdb' if '#' in relation.identifier else relation.database }}].sys.columns c
-        inner join sys.types t
+        from [{{ 'tempdb' if '#' in relation.identifier else relation.database }}].sys.columns c with (nolock)
+        inner join sys.types t with (nolock)
         on c.user_type_id = t.user_type_id
         where c.object_id = object_id('{{ 'tempdb..' ~ relation.include(database=false, schema=false) if '#' in relation.identifier else relation }}')
     )

dbt/include/sqlserver/macros/adapters/metadata.sql

@@ -92,7 +92,7 @@
             column_name,
             ordinal_position as column_index,
             data_type as column_type
-        from INFORMATION_SCHEMA.COLUMNS
+        from INFORMATION_SCHEMA.COLUMNS with (nolock)
 
     )
 
@@ -129,7 +129,7 @@
   {% call statement('list_schemas', fetch_result=True, auto_begin=False) -%}
     USE {{ database }};
     select  name as [schema]
-    from sys.schemas
+    from sys.schemas with (nolock)
   {% endcall %}
   {{ return(load_result('list_schemas').table) }}
 {% endmacro %}