??xml version="1.0" encoding="utf-8" standalone="yes"?>女bbbbxxxx另类亚洲,亚洲成aⅴ人片久青草影院按摩,亚洲经典在线观看 http://m.tkk7.com/anymobile/category/5740.htmlMake Anything Mobile! zh-cn Sat, 01 Sep 2007 01:47:18 GMT Sat, 01 Sep 2007 01:47:18 GMT 60 MySQL的limit参数 http://m.tkk7.com/anymobile/articles/141857.htmlXu Jianxiang Xu Jianxiang Fri, 31 Aug 2007 18:14:00 GMT http://m.tkk7.com/anymobile/articles/141857.html http://m.tkk7.com/anymobile/comments/141857.html http://m.tkk7.com/anymobile/articles/141857.html#Feedback 0 http://m.tkk7.com/anymobile/comments/commentRss/141857.html http://m.tkk7.com/anymobile/services/trackbacks/141857.html
limit参数在数据小时效率非帔RQ随着数据量的增大Q速度呈线性下降,q时候就可以昄出range的优势了?br />
比如有张表有35w条数据,不算大,一ơquery需要不的内存Q如果要分批/页查询的话Q如select * from car order by id limit offset, nums+offsetQ第一ơ查?0w条,则第二次只可以查?w条,W三?w条,……而且C后面数据q会出现重复现象?br />
select * from car order by id limit 0, 100000;
select * from car order by id limit 100001, 150000;
select * from car order by id limit 150001, 180000;
……
集合limit和range可以很好的解册个问题:
select * from car order by id asc limit 0, 100000;
# query {max id} from this list
……
select * from car order by id desc limit 0, 100000;
# query {min id} from this list
……
select * from car where id > {max id} and id < {min id} order by id;
d耗时20s左右Q?br />
]]> Oracle 数据库迁U?/title> http://m.tkk7.com/anymobile/articles/122357.htmlXu Jianxiang Xu Jianxiang Wed, 06 Jun 2007 06:31:00 GMT http://m.tkk7.com/anymobile/articles/122357.html http://m.tkk7.com/anymobile/comments/122357.html http://m.tkk7.com/anymobile/articles/122357.html#Feedback 0 http://m.tkk7.com/anymobile/comments/commentRss/122357.html http://m.tkk7.com/anymobile/services/trackbacks/122357.html 1、执行exp命oQ导出dmp文g
q移某些?br>exp username/password@db_name tables=(table1,table2) file=filepath.dmp q移某个用户下的数据?br>exp username/password@db_name owner=(user1,user2) file=filepath.dmp q移整个数据?br>exp username/password file=filepath.dmp full=y
异常QORA-28009: connection to sys should be as sysdba or sysoper Ҏ(gu)Q?br>exp userid='username/password as sysdba' owner=(user1,user2) file=filepath.dmp =exp 'username/password as sysdba' owner=(user1,user2) file=filepath.dmp 或者输入exp后,在系l提C入用户名的时候,输入“username as sysdba”Q其它按提示输入?/p>
2、上传到数据库服务器
3、新建数据库用户Qusername
4、执行imp命oQ导入dmp文g
exp username/password@db_name fromuser=user touser=user1 file=filepath.dmp log=logfilepath exp userid='username/password as sysdba' fromuser=user touser=user1 file=filepath.log
?EXP和IMP的命令帮助:
exp help=y
通过输入 EXP 命o和用户名/口oQ?zhn)可?br>在用?/ 口o之后的命?
实例: EXP SCOTT/TIGER
或者,(zhn)也可以通过输入跟有各种参数?EXP 命o来控?#8220;导出” 的运行方式。要指定参数Q?zhn)可以使用关键?
格式: EXP KEYWORD=value ?KEYWORD=(value1,value2,...,valueN) 实例: EXP SCOTT/TIGER GRANTS=Y TABLES=(EMP,DEPT,MGR) ?TABLES=(T1: P1,T1: P2)Q如?T1 是分
USERID 必须是命令行中的W一个参数?/p>
关键?nbsp; 说明Q默认) 关键?nbsp; 说明Q默认) -------------------------------------------------------------------------- USERID 用户?口o FULL 导出整个文g (N) BUFFER 数据~冲区的大小 OWNER 所有者用户名列表 FILE 输出文g (EXPDAT.DMP) TABLES 表名列表 COMPRESS 导入一个范?(Y) RECORDLENGTH IO 记录的长?br>GRANTS 导出权限 (Y) INCTYPE 增量导出cd INDEXES 导出索引 (Y) RECORD 跟踪增量导出 (Y) ROWS 导出数据?(Y) PARFILE 参数文g?br>CONSTRAINTS 导出限制 (Y) CONSISTENT 交叉表一致?br>LOG 屏幕输出的日志文?nbsp; STATISTICS 分析对象 (ESTIMATE) DIRECT 直接路径 (N) TRIGGERS 导出触发?(Y) FEEDBACK 昄?x ?(0) 的进?br>FILESIZE 各{储文件的最大尺?br>QUERY 选定导出表子集的子句
下列关键字仅用于可传输的表空?br>TRANSPORT_TABLESPACE 导出可传输的表空间元数据 (N) TABLESPACES 传输的表空间列?/p>
imp help=y
可以通过输入 IMP 命o和?zhn)的用户?口o 跟有(zhn)的用户?/ 口o的命?
实例: IMP SCOTT/TIGER
或? 可以通过输入 IMP 命o和各U自变量来控?#8220;导入” 按照不同参数。要指定参数Q?zhn)可以使用关键?
格式: IMP KEYWORD=value ?KEYWORD=(value1,value2,...,vlaueN) 实例: IMP SCOTT/TIGER IGNORE=Y TABLES=(EMP,DEPT) FULL=N ?TABLES=(T1: P1,T1: P2)Q如?T1 是分
USERID 必须是命令行中的W一个参数?/p>
关键?nbsp; 说明Q默认) 关键?nbsp; 说明Q默认) -------------------------------------------------------------------------- USERID 用户?口o FULL 导入整个文g (N) BUFFER 数据~冲区大?nbsp; FROMUSER 所有h用户名列?br>FILE 输入文g (EXPDAT.DMP) TOUSER 用户名列?br>SHOW 只列出文件内?(N) TABLES 表名列表 IGNORE 忽略创徏错误 (N) RECORDLENGTH IO 记录的长?br>GRANTS 导入权限 (Y) INCTYPE 增量导入cd INDEXES 导入索引 (Y) COMMIT 提交数组插入 (N) ROWS 导入数据?(Y) PARFILE 参数文g?br>LOG 屏幕输出的日志文?nbsp; CONSTRAINTS 导入限制 (Y) DESTROY 覆盖表空间数据文?(N) INDEXFILE 表/索引信息写入指定的文?br>SKIP_UNUSABLE_INDEXES 跌不可用烦引的l护 (N) ANALYZE 执行转储文g中的 ANALYZE 语句 (Y) FEEDBACK 昄?x ?(0) 的进?br>TOID_NOVALIDATE 跌指定cd id 的校?br>FILESIZE 各{储文件的最大尺?br>RECALCULATE_STATISTICS 重新计算l计?(N)
下列关键字仅用于可传输的表空?br>TRANSPORT_TABLESPACE 导入可传输的表空间元数据 (N) TABLESPACES 要传输到数据库的表I间 DATAFILES 要传输到数据库的数据文?br>TTS_OWNERS 拥有可传输表I间集中数据的用?/p>
Q完Q?/p>
]]>Win2k3下配|WinWebMail http://m.tkk7.com/anymobile/articles/115315.htmlXu Jianxiang Xu Jianxiang Fri, 04 May 2007 07:35:00 GMT http://m.tkk7.com/anymobile/articles/115315.html http://m.tkk7.com/anymobile/comments/115315.html http://m.tkk7.com/anymobile/articles/115315.html#Feedback 0 http://m.tkk7.com/anymobile/comments/commentRss/115315.html http://m.tkk7.com/anymobile/services/trackbacks/115315.html 操作pȝQWin 2003 Server SP2 杀毒YӞNorton 10.0企业?br>防火墙YӞBlackIce 3.6 软g版本QWinWebMail Server v3.7.3.1 标准?br>服务器:设有固定IPQ?21.*.*.*Q,托管在电(sh)信机?br> 操作步骤如下Q?br>1。域名(m****.comQ解析添加MX记录Qemail.m****.com 2。设|email.m****.com的A记录Q填入固定IPQ?21.*.*.*Q?br>3。服务器上安装WinWebMail Server?D:\WinWebMail 4。设|Mail Server的DNS为服务器|络q接中的DNSQ设|HELO为m****.comQ成功启动服?br>5。设|安装目录ؓUSER全权 6。在IIS中添加执行该目录的应用,q启IIS 7。在MS防火墙中开头HTTP/80QSMTP/25和POP/110端口的TCP dMail Server的管理程序,发邮件到GMAIL账户QGMAIL很快可以收到邮g。-Q发送邮件OKQ?br>新徏一个̎户pirateQ在本机通过理E序可以收到。-Q接受内|邮件成功! 通过GMAILQ回邮gl[email=admin@m****.com]admin@m****.com[/email]无错误提C邮件返回,admind理E序也没收到q些邮g。-Q?font color=red>接受外网邮gp|Q?/strong> 同样在MS-DOSH口执行 telnet m****.com 25Q内|成功显C:220 ESMTP on WinWebMail [3.7.3.1] ready. http://www.winwebmail.com 但是Q在外网执行同样的命令,却没有Q何回应!Q(问题应该出在这Q?/strong> 原来是BlackIce防火墙也需要开?5端口Q?br>Tools --> Advinced Firewall SettingsQAdd "SMTP"Q勾选All AddressQport?5QType选TCPQMode选AcceptQDuration Of Date选foreverQ点?#8220;Add”按钮Q设|完成! telnet ip 25QpassQ可以接受外|的mail了! 参考文: win2k3 下安?WinWebMail 3.7.3.1 ȝ大全http://www.5dmail.net/bbs/thread-115284-1-1.html
WinWebMail常见问题解答http://www.winwebmail.com/faq.html#2
]]> 几个查数据库性能的SQL语句 http://m.tkk7.com/anymobile/articles/35328.htmlXu Jianxiang Xu Jianxiang Tue, 14 Mar 2006 17:42:00 GMT http://m.tkk7.com/anymobile/articles/35328.html http://m.tkk7.com/anymobile/comments/35328.html http://m.tkk7.com/anymobile/articles/35328.html#Feedback 0 http://m.tkk7.com/anymobile/comments/commentRss/35328.html http://m.tkk7.com/anymobile/services/trackbacks/35328.html
几个常用?/SPAN>SQL 语句 Q?BR>
1?/SPAN>查低效率的语?SPAN lang=EN-US>
select executions , disk_reads , buffer_gets , round (( buffer_gets - disk_reads )/ buffer_gets , 2 ) hit_radio ,
round ( disk_reads / executions , 2 ) reads_per_run , sql_text
from v$sqlarea
where executions > 1 --1 表示执行ơ数过一?/SPAN>
and buffer_gets > 0
and ( buffer_gets - disk_reads )/ buffer_gets < 0.8 -- disk_reads 是读盘的数?/SPAN>
order by 4 desc; 2
、检查目前打开的游标情?/SPAN>
select sql_text , count ( 1 ) from v$open_cursor where user_name = 'X' group by sql_text order by count ( 1 ) desc;
3 ?/SPAN>查指定时间的语句情况
select * from v$sql s where first_load_time < '2006-03-01 /00:00:00' order by s . EXECUTIONS desc;
-- 2?3 ?/SPAN> 以后载入的语?/SPAN>
4 ?/SPAN>查执行时?st1:chsdate IsROCDate="False" IsLunarDate="False" Day="13" Month="2" Year="2006" w:st="on">2 ?SPAN lang=EN-US>13 ?/st1:chsdate>以后过30 U的语句
select * from v$session_longops s where s . start_time > '28-feb-06' and s . LAST_UPDATE_TIME - s . START_TIME > 30 / 1440 / 60 order by start_time ;
备注Q?BR>v$open_cursor 已经打开的游标,Ҏ(gu)做的有数据库操作的程序可以通过查这个视图来认游标的用情?
v$session 当前q接到数据库服务器的用户名和q接?
v$sql 所有执行过的数据库语句
v$session_longops 执行旉较长的语?
]]>
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