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我有一个非常奇怪的问题。

如果具有public和db_datareader访问权限的用户尝试在 SSMS 17.2 中扩展表，他们会收到Lock request time out period exceeded. (Microsoft SQL Server, Error: 1222)错误消息。

如果用户sysadmin执行相同的操作，则操作按预期工作。

我在 SSMS 扩展返回以下代码的表时运行了分析器。

如果我以管理员身份运行此代码，它会在不到一秒的时间内完成。但是，当具有db_datareader访问权限的用户运行它时，它需要 20 多秒才能执行。

可能是什么原因造成的？

SET LOCK_TIMEOUT 10000

exec sp_executesql N'SELECT
tbl.name AS [Name],
SCHEMA_NAME(tbl.schema_id) AS [Schema],
''Server[@Name='' + quotename(CAST(
        serverproperty(N''Servername'')
       AS sysname),'''''''') + '']'' + ''/Database[@Name='' + quotename(db_name(),'''''''') + '']'' + ''/Table[@Name='' + quotename(tbl.name,'''''''') + '' and @Schema='' + quotename(SCHEMA_NAME(tbl.schema_id),'''''''') + '']'' AS [Urn],
tbl.create_date AS [CreateDate],
CAST(tbl.is_memory_optimized AS bit) AS [IsMemoryOptimized],
CAST(CASE idx.type WHEN 5 THEN 1 ELSE 0 END AS bit) AS [HasClusteredColumnStoreIndex],
CAST(tbl.is_remote_data_archive_enabled AS bit) AS [RemoteDataArchiveEnabled],
tbl.temporal_type AS [TemporalType],
CAST(CASE WHEN ''PS''=dsidx.type THEN 1 ELSE 0 END AS bit) AS [IsPartitioned],
CAST(
        ISNULL((SELECT distinct 1 from sys.all_columns
                WHERE object_id = tbl.object_id 
                AND is_sparse = 1), 0)
       AS bit) AS [HasSparseColumn],
CAST(ISNULL((select top 1 1 from sys.indexes ind where ind.object_id = tbl.object_id and ind.type > 1 and ind.is_hypothetical = 0 ), 0) AS bit) AS [HasNonClusteredIndex],
CAST(CASE idx.index_id WHEN 1 THEN 1 ELSE 0 END AS bit) AS [HasClusteredIndex],
CAST(case idx.index_id when 1 then case when (idx.is_primary_key + 2*idx.is_unique_constraint = 1) then 1 else 0 end else 0 end AS bit) AS [HasPrimaryClusteredIndex],
CAST(ISNULL((select top 1 1 from sys.indexes ind where ind.object_id = tbl.object_id and ind.type = 3 and ind.is_hypothetical = 0 ), 0) AS bit) AS [HasXmlIndex],
CAST(ISNULL((select top 1 1 from sys.all_columns as clmns join sys.types as usrt on usrt.user_type_id = clmns.user_type_id where clmns.object_id = tbl.object_id and usrt.name = N''xml''), 0) AS bit) AS [HasXmlData],
CAST(ISNULL((select top 1 1 from sys.all_columns as clmns join sys.types as usrt on usrt.user_type_id = clmns.user_type_id where clmns.object_id = tbl.object_id and usrt.name in (N''geometry'', N''geography'')), 0) AS bit) AS [HasSpatialData],
CAST(ISNULL((select top 1 1 from sys.indexes ind where ind.object_id = tbl.object_id and ind.type = 6 and ind.is_hypothetical = 0 ), 0) AS bit) AS [HasNonClusteredColumnStoreIndex]
FROM
sys.tables AS tbl
INNER JOIN sys.indexes AS idx ON 
        idx.object_id = tbl.object_id and (idx.index_id < @_msparam_0  or (tbl.is_memory_optimized = 1 and idx.index_id = (select min(index_id) from sys.indexes where object_id = tbl.object_id)))

LEFT OUTER JOIN sys.data_spaces AS dsidx ON dsidx.data_space_id = idx.data_space_id
WHERE
(CAST(
 case 
    when tbl.is_ms_shipped = 1 then 1
    when (
        select 
            major_id 
        from 
            sys.extended_properties 
        where 
            major_id = tbl.object_id and 
            minor_id = 0 and 
            class = 1 and 
            name = N''microsoft_database_tools_support'') 
        is not null then 1
    else 0
end          
             AS bit)=@_msparam_1 and tbl.is_filetable=@_msparam_2 and CAST(tbl.is_memory_optimized AS bit)=@_msparam_3 and tbl.temporal_type=@_msparam_4 and CAST(tbl.is_external AS bit)=@_msparam_5)',N'@_msparam_0 nvarchar(4000),@_msparam_1 nvarchar(4000),@_msparam_2 nvarchar(4000),@_msparam_3 nvarchar(4000),@_msparam_4 nvarchar(4000),@_msparam_5 nvarchar(4000)',@_msparam_0=N'2',@_msparam_1=N'0',@_msparam_2=N'0',@_msparam_3=N'0',@_msparam_4=N'0',@_msparam_5=N'0'

编辑 1： @Dan Guzman 检查执行计划的建议是一个很好的建议。两个用户之间的执行计划是相同的，除了以下等待 db_datareader 用户：<Wait WaitType="LCK_M_SCH_S" WaitTimeMs="7868" WaitCount="1" />。

对该数据库运行了一个大型 INSERT BULK 操作，但我不明白为什么锁会出现在一个用户而不是另一个用户上？

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0 回答 0