目標package0event_counter使用 event_counter 目標可計算事件工作階段中每個事件的發生次數。 目標package0event_file使用 event_file 目標可將事件資料儲存到 XEL 檔案,之後可以封存起來供未來的分析和檢閱使用。 您可合併多個 XEL 檔案,以檢視來自不同事件工作階段的合併資料。
我们直接使用某个instance id:c5478443d44931cc:767dad4400000003,在profile页面上进行搜到,可以看到该instance下的HDFS_SCAN_NODE对应的counter也是345: 关于ScanRangesComplete 在Impala的profile中,有一个ScanRangesComplete counter,我们将某个表的所有HDFS_SCAN_NODE中对应的ScanRangesComplete加在一起,就等于上面提到的...
WHILE ((@Counter < @OriginalSize / 16) AND (@Counter < 50000)) BEGIN -- update INSERT DummyTrans VALUES ('Fill Log') DELETE DummyTrans SELECT @Counter = @Counter + 1 END EXEC (@TruncLog) END SELECT 'Final Size of ' + db_name() + ' LOG is ' + CONVERT(VARCHAR(30),size) + ...
COUNTER := COUNTER + 1; PRINT CAST(X AS CHAR(10)) || CAST(COUNTER AS CHAR(10)) || 'OUTER LOOP'; //这里是一个嵌套的子语句块的开始 */ DECLARE X INT := 0; //局部变量X,与全局变量X同名 BEGIN FOR I IN 1 .. 4 LOOP X := X + 1; COUNTER := COUNTER + 1; PRINT CAST(X ...
1.SELECT：用于从数据库表中检索数据。2.INSERT：用于向数据库表中插入新的数据。3.UPDATE：用于更新...
can you add colour to a fields output in T-SQL? Can you change the value of yes or no instead of true or false use data type (BIT) ? Can you have a TRY CATCH in dynamic SQL? Can you Select From (another query)? Can you use a case statement as part of a left join Can't ...
( WHERE [package0].[counter] <= 4 -- A predicate filter. ) ADD TARGET package0.event_counter WITH ( MAX_MEMORY = 4096 KB, MAX_DISPATCH_LATENCY = 3 SECONDS ); event_file 目标event_file 目标可将来自于缓冲的事件会话输出写入到磁盘文件或 Azure 存储中的 blob 中:在...
-- session_parms := &&1..wwsto_api_session.load_session(DOMAIN,SUBDOMAIN); ex_counter := session_parms.get_attribute_as_number( 'ex_counter' || p_portlet_record.reference_path); if (ex_counter is null) then -- first invocation session_parms.set_attribute( 'ex_counter' || p_...
变量的赋值:SET @var_name = GETDATA()、SELECT COUNT(sno)=@MyCounter from student 显示变量的值:PRINT @var_name,@MyCounter 批出理语句使用 /* 多行注释 */ -- 单行注释 SELECT sno,sname FROM student GO -- 此处 GO 为批处理语句 1.
INSERT INTO TestTable VALUES -- Use the variable to provide the integer value -- for cola. Also use it to generate a unique letter -- for each row. Use the ASCII function to get the -- integer value of 'a'. Add @MyCounter. Use CHAR to -- convert the sum back to the character...