Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

ÐÞ¸ÄOracleµÄ½ø³ÌÊý[processes]¼°»á»°Êý[sessions]

ÐÞ¸ÄOracleµÄ½ø³ÌÊý[processes]¼°»á»°Êý[sessions]
1.ͨ¹ýSQLPlusÐÞ¸Ä
OracleµÄsessionsºÍprocessesµÄ¹ØÏµÊÇ
         sessions=1.1*processes + 5
ʹÓÃsys£¬ÒÔsysdbaȨÏ޵Ǽ£º
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;
ϵͳÒѸü¸Ä¡£
SQL> show parameter processes;
NAME                                 TYPE        VALUE
------------------------------------ ----------- -----------------------------------------
aq_tm_processes                    &n


Ïà¹ØÎĵµ£º

oracle²éѯÁ·Ï°

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';
--- ......

Ò»¸öÊý¾Ý¿â²Ù×÷À࣬ÊÊÓÃÓÚOracle£¬ACCESS,SQLSERVER

     ×î½ü×öÁËÒ»¸öÊý¾ÝÕï¶ÏµÄÏîÄ¿£¬ÀïÃæ×Ô¼ºÐ´ÁËÒ»¸öÊý¾Ý¿âµÄ²Ù×÷À࣬°üº¬£ºÁ¬½ÓÊý¾Ý¿â¡¢¶ÁÊý¾Ý±í¡¢Ö´ÐÐSQL²Ù×÷£¬ÊÍ·ÅÊý¾Ý¿âµÈ×é³É£¬Ï£Íû¶Ô´ó¼ÒÓÐÓã¬ÓÉÓÚˮƽÓÐÏÞ£¬ÈôÓдíÎó»òÕß´úÂë²»×ãµØ·½»¶Ó­Ö¸Õý£¬Ð»Ð»¡£
ADOOperate.H
//////////////////////////////////////////////////////////////////////
// ......

oracle ¹ÙÍøÎÞ·¨·ÃÎʵÄÎÊÌâ

×î½üÓöµ½ÔÚwindows 2008ÏÂIEÆäËüµÄÍøÒ³¶¼¿ÉÒÔ·ÃÎÊ,ΨÓÐoracle.com²»ÄÜ·ÃÎÊ,ÕæÓôÃÆÁË,ºóÀ´ÕÒÒ»´úÀí,·ÃÎÊËÙ¶È»¹¿ÉÒÔ,ÅäÖÃÈçÏÂ:
Õâ¸ö´úÀíµÚÒ»´Î·ÃÎʵϰ£¬ÐèÒªÌøµ½ËûµÄÖ÷Ò³£¬¹ý¸öÊ®¼¸ÃëÖоͿÉÒÔÌø×ªµ½OracleµÄ¹Ù·½ÍøÕ¾ÁË¡£
—————————————&md ......

ÈçºÎ¿´¶®ORACLEÖ´Ðмƻ®

ÈçºÎ¿´¶®ORACLEÖ´Ðмƻ®
Ò»¡¢Ê²Ã´ÊÇÖ´Ðмƻ®
An explain plan is a representation of the access path that is taken when a query is executed within Oracle.
¶þ¡¢ÈçºÎ·ÃÎÊÊý¾Ý
At the physical level Oracle reads blocks of data. The smallest amount of data read is a single Oracle block, the largest is con ......

PostgreSQLºÍOracleÓ÷¨ÉϵÄÒ»Ð©Çø±ð

£¨1 £© ×¢ÒâÔö¼ÓÔ¼ÊøÊ±µÄд·¨£¬ºÍORACLE ÂÔÓв»Í¬
Oracle £º
ALTER TABLE SCHEMA.PREFIX_INFO ADD (
CONSTRAINT PK_PREFIX_INFO PRIMARY KEY (INFO_ID));
PostgresQL £º
alter table schema.prefix_info add constraint prefix_info_pkey primary key(info_id);
£¨2 £©ÏµÍ³Ä¬ÈϵÄ×î´óÖµÓëORACLE ²»Í¬
Oracle £ ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ