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一、Types of Collections 1、Associative arrays 数组 它是同种类型的一维、无边界的稀疏集合,只能用于 PL/SQL。 DECLARE TYPE t_name IS TABLE OF varchar2(10) INDEX BY PLS_INTEGER; --创建 Collection i_name ... 阅读全文
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create table test1(a int,b int); create table test2(a int,b int); insert into test1 values(1,456); insert into test1 values(2,427); insert into... 阅读全文
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1.declare x number := 60; begin case x when 10 then dbms_output.put_line('x=10'); when 20 then dbms_output.put_line('x=20'); when 30 then dbms_output.put_line('x=30')... 阅读全文
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declare x number := 20; begin if x = 10 then dbms_output.put_line('x = 10'); elsif x = 20 then dbms_output.put_line('x = 20'); else dbms_output.put_line('no data'); end if; end; 阅读全文
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ORA-1722 is Invalid number. We've attempted to either explicity or implicity convert a character string to a number and it is failing. This can happen for a number of reasons. It generally happens... 阅读全文
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as yet 1. 到目前为止,迄今为止,到这时为止(还没有,还不是);到当时为止;至今还[见 yet] 2. 直到现在,到目前(或当时)为止 Nothing that stood in your way before stands there now in the same way.It's all new,even if you can't as yet s... 阅读全文
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本文首先详细介绍了oracle中buffer cache的概念以及所包含的内存结构。然后结合各个后台进程(包括DBWRn、CKPT、LGWR等)深入介绍了oracle对于buffer cache的管理机制,并详细解释了oracle为什么会采用现在的管理机制,是为了解决什么问题。比如为何会引入touch次数、为何会引入增量检查点等等。最后全面介绍了有关buffer cache监控以及调优的实用方法。... 阅读全文
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select username,sid,opname, round(sofar*100 / totalwork,0) || '%' as progress, time_remaining,sql_text from v$session_longops , v$sql where time_remaining 0 and sql_address = address... 阅读全文
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quit it! 别闹! Don't mention it. 没关系,别客气。 Who knows! 天晓得! It is not a big deal! 没什么了不起! How come… 怎么回事,怎么搞的。 Don't push me. 别逼我。 Come on! 快点,振作起来!(come on的含义很多,主要体现在语气上,使用时请注意语气) Have a good of it.玩的很高兴... 阅读全文