ÐÞ¸ÄOracleµÄ½ø³ÌÊý[processes]¼°»á»°Êý[sessions]
ÐÞ¸ÄOracleµÄ½ø³ÌÊý[processes]¼°»á»°Êý[sessions]
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OracleµÄsessionsºÍprocessesµÄ¹ØÏµÊÇ
sessions=1.1*processes + 5
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SQL> show parameter processes;
NAME TYPE VALUE
------------------------------------ ----------- ---------------------------------------
aq_tm_processes integer 1
db_writer_processes integer 1
job_queue_processes integer 10
log_archive_max_processes integer 1
processes integer 150
SQL> alter system set processes=400 scope = spfile;
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SQL> show parameter processes;
NAME TYPE VALUE
------------------------------------ ----------- -----------------------------------------
aq_tm_processes &n
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empÔ±¹¤±í
(empnoÔ±¹¤ºÅ/enameÔ±¹¤ÐÕÃû/job¹¤×÷/mgrÉϼ¶±àºÅ/hiredateÊܹÍÈÕÆÚ/salн½ð/commÓ¶½ð/deptno²¿ÃűàºÅ)
------1.Ñ¡Ôñ²¿ÃÅ30ÖеÄËùÓÐÔ±¹¤.
select ename
from emp
where deptno = 30;
------2.ÁгöËùÓаìÊÂÔ±(CLERK)µÄÐÕÃû£¬±àºÅºÍ²¿ÃűàºÅ.
select ename,empno,deptno
from emp
where job='CLERK';
--- ......
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1,Áгö×îµÍн½ð´óÓÚ1500µÄ¸÷ÖÖ¹¤×÷¼°´ÓÊ´˹¤×÷µÄÈ«²¿¹ÍÔ±ÈËÊý¡£
select job,count(empno) from emp
where job in(select job from emp group by job having min(sal)>1500)
group by job;
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select e.ename,d.dname,m.ename,e.sal,sa. ......
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create table person (pid int,name varchar2(20) unique,
age int check(age between 0 and 150),sex varchar(4) default 'ÄÐ',tp int,
address varchar(200),constraint person_pid_pk primary key(pid));
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insert into person values(0011,'ÁõÈý½ã',25,'ÄÐ',13930123021,'ºÓ±±Ê¡ÇúÑôÏØ');
´´½¨×Ó±í ......