Lastly, SQL Server can also create a plan with an eager spool which can be seen below for the query. In case of eager spool, query execution can continue only after the eager spool has been fully created. This is different from the lazy spool. select count(distinct ShipVia), count(disti...
The problem with this query is with the use of CONCAToperator (||). e.g.: select char1 || char2 from dual Concat operator returns char1 concatenated with char2. The string returned is in the same character set as char1. So here concat operator is trying to return varchar2, which ha...
The problem with this query is with the use of CONCAT operator (||). e.g.: select char1 || char2 from dual Concat operator returns char1 concatenated with char2. The string returned is in the same character set as char1. So here concat operator is trying to return varchar2, which ...
1. SQL> spool d:\data.cvs 【指定导出文件,导出开始】 2. SQL> set echo off; 【不显示执行的SQL命令】 3. SQL> set feedback off; 【关闭“已选择XX行”的提示】 4. SQL> set heading off; 【去掉select结果的字段名,只显示数据】 5. SQL> set termout off; 【关闭屏幕上的SQL执行结果显示】 ...
--- Stores query results in a file, or optionally sends the file to a printer. SPO[OL] [file_name[.ext] [CRE[ATE] | REP[LACE] | APP[END]] | OFF | OUT] 以上的几个参数 类似于 save命令 完整的spool命令使用过程: SQL> spool 'e:query.sql' SQL...
Sure, it’s not perfect, but it can get you where you’re going fast enough. If you’re relying on that sort of feedback in query plans, or in the missing index DMVs, you’ll hate this. Not only does SQL Server create an index for you, it doesn’t really tell you about it. ...
Lastly, SQL Server can also create a plan with an eager spool which can be seen below for the query. In case of eager spool, query execution can continue only after the eager spool has been fully created. This is different from the lazy spool....
Syntax SPO[OL] [file_name[.ext] [CRE[ATE] |REP[LACE]| APP[END]] | OFF | OUT] Storesqueryresultsin a file, or optionally sends the file to a printer. Terms file_name[.ext] Represents the nameof the file to which you wish to spool. SPOOL followed byfile_namebegins spooling display...
（1）常规使⽤spool⽅法，将set的⼀些命令和spool，select等放⼊.sql脚本中，然后再sqlplus中运⾏该脚本。以下为logmnr.sql脚本，在sqlplus中执⾏@logmnr.sql就可以写⼊⽂件record3.txt中。不会再终端显⽰任何信息。但是，如果是在sqlplus中输⼊：set termout off;...spool record3.txt select...
If you have seen enough query plans, you for sure ran into spool operators (index spool or table spool). It is documented inhttps://technet.microsoft.com/en-us/library/ms181032(v=sql.105).aspx The spool operator helps improve a query performance because it stores intermediate results so ...