小编Pet*_*ter的帖子

我有一个扩展事件可以过滤我的慢速查询。我为其创建了以下脚本。

CREATE EVENT SESSION [SlowQueriesAndStatementsLargerThan3Seconds] ON SERVER 
ADD EVENT sqlserver.rpc_completed(SET collect_statement=(1)
    ACTION(sqlserver.client_app_name,sqlserver.client_hostname,sqlserver.database_id,sqlserver.database_name,sqlserver.nt_username,sqlserver.session_id,sqlserver.session_nt_username,sqlserver.sql_text,sqlserver.username)
    WHERE ([duration]>=(3000000))),
ADD EVENT sqlserver.sp_statement_completed(
    ACTION(sqlserver.client_app_name,sqlserver.client_hostname,sqlserver.client_pid,sqlserver.database_name,sqlserver.nt_username,sqlserver.server_principal_name,sqlserver.session_id)
    WHERE ([duration]>=(3000000))),
ADD EVENT sqlserver.sql_batch_completed(
    ACTION(sqlserver.client_app_name,sqlserver.client_hostname,sqlserver.database_id,sqlserver.database_name,sqlserver.nt_username,sqlserver.session_id,sqlserver.session_nt_username,sqlserver.sql_text,sqlserver.username)
    WHERE ([duration]>=(3000000)))
ADD TARGET package0.event_file(SET filename=N'SlowQueriesAndStatementsLargerThan3Seconds'),
ADD TARGET package0.ring_buffer
WITH (MAX_MEMORY=4096 KB,EVENT_RETENTION_MODE=ALLOW_SINGLE_EVENT_LOSS,MAX_DISPATCH_LATENCY=30 SECONDS,MAX_EVENT_SIZE=0 KB,MEMORY_PARTITION_MODE=NONE,TRACK_CAUSALITY=ON,STARTUP_STATE=ON)
GO

我想包括我的查询在速度缓慢时正在等待的位置。我想包含它的 wait_info ，但是当我添加它时，我的跟踪充满了与其他查询无关的等待。为了跟踪等待情况，我添加了以下事件：

    CREATE EVENT SESSION [SlowQueriesAndStatementsLargerThan3Seconds] ON SERVER 
ADD EVENT sqlos.wait_info(
    ACTION(sqlos.task_elapsed_quantum,sqlos.task_time,sqlserver.client_app_name,sqlserver.client_hostname,sqlserver.database_id,sqlserver.database_name,sqlserver.session_id,sqlserver.sql_text)
    WHERE ([opcode]='End')),
ADD EVENT sqlserver.rpc_completed(SET collect_statement=(1)
    ACTION(sqlserver.client_app_name,sqlserver.client_hostname,sqlserver.database_id,sqlserver.database_name,sqlserver.nt_username,sqlserver.session_id,sqlserver.session_nt_username,sqlserver.sql_text,sqlserver.username)
    WHERE ([duration]>=(3000000))),
ADD EVENT sqlserver.sp_statement_completed(
    ACTION(sqlserver.client_app_name,sqlserver.client_hostname,sqlserver.client_pid,sqlserver.database_name,sqlserver.nt_username,sqlserver.server_principal_name,sqlserver.session_id)
    WHERE ([duration]>=(3000000))),
ADD EVENT sqlserver.sql_batch_completed(
    ACTION(sqlserver.client_app_name,sqlserver.client_hostname,sqlserver.database_id,sqlserver.database_name,sqlserver.nt_username,sqlserver.session_id,sqlserver.session_nt_username,sqlserver.sql_text,sqlserver.username)
    WHERE ([duration]>=(3000000)))
ADD TARGET package0.event_file(SET filename=N'SlowQueriesAndStatementsLargerThan3Seconds'),
ADD TARGET package0.ring_buffer …

我有一个我想要改进的程序，它使用这个 where 子句：

WHERE   p.PlatformId = ISNULL(@PlatformId, p.PlatformId)
and p.PayeeStsId     = 1
and p.PlatformPayeeId   = ISNULL(@platformPayeeId, p.PlatformPayeeId)
and pba.PayeeBankStsId=1
and a.Gcid = ISNULL(@Gcid, a.Gcid)

这ISNULL给我使用索引带来了问题，我怎样才能避免使用这种格式ISNULL？

p.PlatformId = ISNULL(@PlatformAccountId, p.PlatformId)

这种格式导致执行计划进行索引扫描。

我正在尝试使用触发器捕获登录时间EVENTDATA()。但它只为所有类型的事件提供 Null 值。有人可以帮我解决这个问题吗？这是我的触发器

CREATE TRIGGER trgBlockIP
    ON ALL SERVER
    FOR LOGON
    AS
    BEGIN
       DECLARE @clientip NVARCHAR(15);
       SET @clientip = (
                          SELECT
                             EVENTDATA().value(
                                                 '(/EVENT_INSTANCE/Clienthost)[1]',
                                                 'NVARCHAR(15)'
                                              )
                       );
       IF EXISTS (
                    SELECT ip
                    FROM   master.dbo.BLockedIPAddresses
                    WHERE  ip = @clientip
                 )
       BEGIN
          PRINT 'Your IP Address is blocked';
          ROLLBACK;
       END;
       ELSE
       BEGIN
          DECLARE @Range VARCHAR(15);
          SELECT
             @Range = SUBSTRING(
                                  @clientip,
                                  1,
                                  LEN(@clientip)
                                  - CHARINDEX('.', REVERSE(@clientip))
                               ) + '.*';
          IF EXISTS (
                       SELECT ip
                       FROM   master.dbo.BLockedIPAddresses
                       WHERE  ip = @Range
                    )
          BEGIN …