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Configue sqlplus under linux env
1. Using 'Backspace' to delete:add 'stty erase ^h' to '/home/oracle/.bash_profile'then execute ' source .bash_profile's2. Use Line Up and Line Down keys to get the command ...
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内网查看出口IP
Windows: tracert www.google.comLinux: wget http://members.3322.org/dyndns/getip cat getip &...
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Hosts文件中一个域名绑定多个IP后处理机制
电脑在hosts文件中是由上往下查找ip，若无此IP则打不开网页，然后继续查找，若找到则可以打开IP，则不再继续查找，不论是否正确。因此，可以在hosts里绑定多个IP指向同一个网站，这样就可以增大打开该网站的...
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Webbench and Apachebench
Web Bench is very simple tool for benchmarking WWW or proxy servers. Uses fork() for simulating multiple clients and can use HTTP/0.9-HTTP/1.1 requests. This benchmark is not very realistic, ...
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Linux Performance Monitoring
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diff / sed/ histtimeformat
1. diff [-q][--brief][-y][--left] file1 file22. sed -i 's/stringReplaced/stringNew/' filename3. export HISTTIMEFORMAT = "%F %T" history
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SSH PuttyGen
PuttyGen : generate public and private keys used to login Linux after configuration without password,convinent.private key - keeped in localhost, and located into putty Authen.public key - transmit ...
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Linux Disk info
/* check disk space */cat /proc/diskinfodf [-a][-i][-t]du -sh/* check the process of the file deleted */lsof|grep deletekill pids/* cleanup content of a file*/cat /dev/null > filen...
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nmon and nmon analyser
nmon: linux and aix monitoring and analysis tool download and put on linux or aix,then chmod 755 nmon before the execution.usages:nmon -f -t -s interval -c count -m /path/log/nmo...
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1st. download installer and start 1st ruby script
1. start->programmes->ruby->start command prompt with ruby ruby -v: ruby 1.9.2p180<2011-02-18> [term 1.001]irb: interactive ruby programming environme...
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Oracle - 10053 Event
Event 10053 is used to dump optimizer decisions to trace file. Usage:{alter session set tracefile_identifier=' id_flag';alter session set events '10053 trace name context forever, lev...
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Terms in Execution plan & Optimization Trace
Cost: the value of this column does not have any particular unit of measurement; It is merely a weighted value used to compute costs of execution plans.Card: estimated by the cost-b...
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Eclipse Java EE - 1
GNU is a Unix-like computer operating system developed by GNU project,ultimately aiming to be a "complete Unix-compatibale software system" composed wholly fo free software.GCJ: GNU Compi...
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Java GC Part1 <ZZ>
What is Garbage Collection?Garbage Collection – not just garbage collectionGarbage collection is a format of automatic memory management. Memory which has been dynamically allocated but whic...
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JRE SDK and JDK Terms
JRE: Java Runtime Environment, it just provides an environment for u to run java applications and applets.SDK: Standard Develop Kit, an environment to develop java applications and applets...
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DB2_RR_TO_RS
db2set DB2_RR_TO_RE=YES;* RR: Repeatable Read* RS: Read StabilityThe potential deadlock and timeout problems can be resolved by turning on DB2_RR_TO_RS environment var...
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Java assert
assert logical_expresion;assert logical_expresion: string_expresion;example:if(daysInMonth == 30){System.out.println("Month is April, June, September, or November");} else if(daysInMo...
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DIT - LDAP entries and nodes
1. DIT: Directory Information Tree, LDAP . ldif formate file contains entries that conform. to it.2. LDAP directory stores information in ndoes. In this directory, each u...
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backup and restore ldap database off line on windows platform
1. Backup:First to stop TDS server and TDS instance in services.Then cd d:/ldap/v6.2/sbin/ to execute backup command:idsdbback -I <instance_name> -k <backup_dir> -...
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DB2 Create Index
An index is an ordered set of pointers to rows of a table. DB2 can use indexes to improve performance and ensure uniqueness.In most cases, access to data is faster with an index than with a sc...
