sql query analyzer 2017

Label:It is understood that the vast majority of developers understand the index is smattering, limited to the majority of daily work without opportunities, and what is not necessary to care about the index, it is a query is too slow to find the query criteria to build an index OK, which day and a query slow, and then build an index is, Or simply the entire

unique clustered index indexedview_test1on v_test_indexedview (salesorderdetailid) Next, let's use Liu Qian's line: It's time to witness the miracle. Let's execute the previous query again: In the above example, we can see the powerful power of the index view. Even if your query statement does not contain this index view, the query

miracle. Let's execute the previous query again: In the above example, we can see the powerful power of the index view. Even if your query statement does not contain this index view, the query analyzer will automatically select this view, this greatly improves the performance. of course, such powerful performance is

(sender, receiver, msg. as_string () smtp. quit () Does T Exception, e: print e, 'Send mail error' if _ name __= = '_ main __': result = None htmlfile+'mysqlslowmon.html 'myiplist = ['2017. 168.10.10 ', '2017. 168.10.19 '] yestoday = (datetime. now ()-timedelta (days = 1 )). strftime ("% Y-% m-% d 00:00:00") today = datetime. now (). strftime ("% Y-% m-% d 00:00:00") for myip in myiplist:

operated. 22. Before SQL2000, do not use the following words: "Is null", " 23. Use query analyzer to check the SQL statement query plan and evaluate and analyze whether the SQL statement is optimized. Generally, 20% of the Code occupies 80% of the resources, and our optim

column. SQL code 1. SELECT ename, sal, job FROM emp WHERE sal> 2500 minus select ename, sal, job FROM emp WHERE job = 'manager'; 8. CASE expressions and reverse queries Use CASE expressions, you can avoid calling the process to complete the condition branch operation. SQL code 1. SELECT ename, sal, case when sal> 3000 THEN 3 WHEN sal> 2000 THEN 2 ELSE 1 END grade FROM emp WHERE deptno = 10; by default, WHE

Introduction In SQL Server, indexes are enhanced, which means that SQL Server can still implement its functions even if there is no index. However, indexes can greatly improve query performance in most cases, especially in OLAP. to fully understand the concept of indexes, you need to understand a lot of principles, including B-tree, heap, database pages, areas,

servers where resource utilization is constantly changing. First, you need to figure out how to test the resource usage of our servers when tuning the query.Recall the set STATISTICS IO and set STATISTICS timeSQL Server has long supported the two Transact-SQL commands for set STATISTICS IO and set STATISTICS time, but for some other reason, many DBAs (data are system administrators) ignore them when tuning query