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RSS订阅原创 软考专业英语 网络工程师考试科目一 话题词汇汇总
【专业英语中网络协议的RFC号】【2022-2020年词汇】【2019-2017年词汇】【2016-2015年词汇】【2014-2013年词汇】【网络工程师专业英语】
2023-05-29 10:12:55
255
原创 国际移动设备识别码IMEI
TAC，Type Allocation Code，类型分配码，由8位或6位数字组成，它是区分手机品牌和型号的编码，由全球移动通信系统协会GSMA及它的授权机构分配。这个算法也被称为模10算法，是一种简单的校验和算法，常用于验证身份识别码，是由IBM的科学家Hans Peter Luhn创造的，设计它的目的是防止意外出错。FAC，Final Assembly Code，最终装配地代码，由2位数字构成，这个代码主要是生产商内部区分生产地用到的代码，在早期TAC码为6位的手机中存在。
2022-10-28 22:10:00
953
原创 网络规划设计师学习之网络通信协议
网络协议ISO7层和TCP/IP4层，参考科来的网络通讯协议图2020版，截取了原图的最左边的部分。来看一下各层的设备
2021-08-06 22:07:04
182
转载 SecureCRT
SecureCRT is a commercial SSH and Telnet client and terminal emulator by VanDyke Software.It alse have Mac OS X version and Linux version.Its features as follows:graphical user interface with tab su
2012-07-10 16:12:14
379
原创 Linux CPU、内存查看命令
试验环境redhat Linux5.4 x86_64版本：uname -ar内存：cat/proc/meninfo -------------------------------------MemTotal: 16433032 kBMemFree: 45260 kBBuffers: 383808 kBCached: 12
2012-07-09 14:39:52
688
翻译 Derby数据库中实现的基本的SQL数据类型
表 1. Derby 中的基本整数数据类型枚举值数据类型最小值最大值示例说明0SMALLINT-32768 (-215)32767 (215 - 1)itemNumber SMALLINT2 字节整数表示1I
2012-07-09 14:20:58
4809
原创 JDBC与oracle informix数据类型对应表
java.sql.Typesjava类型OracleInformixBIGINTjava.lang.longNUMBER(38,0)INT8BiNARYbyte[]RAWBYTEBITjava.lang.booleanBITBITBLOBbyte[]BLOBBLOBCHARj
2012-07-09 14:13:49
2238
转载 Different process constructs in jBPM5
Executable processes in BPMN consist of a differenttypes of nodes being connected to each other using sequence flows. The BPMN 2.0 specificationdefines three main types of nodes:Events: They are
2012-07-09 11:37:53
411
转载 jBPM5 Core Engine API
To interact with the process engine(to for example start a process),you need to set up a session.This session will be used to communicate with the process engine. A session needs to have areferenc
2012-07-09 11:33:26
684
转载 Informix 常见系统表
systables：描述数据库中的很张表；syscolumns：描述数据库中表的列；sysindexes：描述数据库中列的索引；sysfragments：存储了分段索引的片段信息；sysfragauth：表识别列级权限；sysviews：描述了数据库中定义的每个视图；sysdpend：描述了视图是如何依赖其他视图和表的；syssyntable：定义每一个同义词及其所代表
2012-07-06 17:47:23
454
转载 Oracle DB Tuning recipe
假设操作系统和数据库的数据都已经收集了，以下是Oracle DB Tuning的一些步骤（可据经验增加）1. Is the response time/batch run time acceptable for a single user on an empty orlightly loaded system?If it is not acceptable, then the ap
2012-07-06 17:25:55
460
原创 IBM MQ常见错误号
2009 -The connection to the queue manager was lost. ----------Verify the channel name.2058 -Queue manager name not valid or not known.---------Amend the queue manager name and retry.2059 -Th
2012-07-06 17:24:12
4281
原创 RedHat Linux下MQ安装步骤及MQ常用命令
1、检查操作系统及内存情况：lsb_release -a;2 检查java 环境：java -version3 新建用户空间、用户和组：//创建用户目录mkdir /home/mqm//创建用户组groupadd mqm//创建用户useradd -g mqm -d /home/mqm -m -s /bin/bash mqm4 创建MQ安装文件夹：/
2012-07-06 17:15:27
10297
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原创 informix dbschema 常用语句
查找某张表的表结构信息到文件tablenqme.sql：dbschema -d dataBaseName -t tablename; 导出所有-t后为all ;导出详细信息 -t tablename后加-ss 参数查找某个存储过程的信息到文件procedurename.sql：dbschema -d dataBaseName -f procedurename ;导出所有-t后为all
2012-07-06 16:31:42
1209
原创 数据库导入oracle-sqlldr informix-dbload
oracle sqlldrsqlldr userid=username/password control=controlfilename.ctlcontrolfile的内容：Load DATAINFILE 'csvdatafile.csv'INTO TABLE TABLENAMEAppendFIELDS TERMINATED BY ',' TRAILING NULLC
2012-07-06 16:14:00
1012
原创 Linux/unix命令
RedHat Linux 2.6.18-164.el5查看当前系统的进程的列表：ps ax查看进程及它们的所有者： ps aux 时刻更新的运行进程列表：top当前系统占用CPU或内存最多的5个进程：sort -k4nr |head -n 5HP-UX B.11.31 U ia64 (ta) 检查系统路由表：netstat -rCPU及内存情况查看：vmstat
2012-07-06 15:44:37
331
翻译 工作流开发过程
1、首先要识别出工作流，即找出候选的工作流。2、可视化流程建模，此处将用到的是jBPM (jBPM Graphical Process Designer GPD)editor3、开发运行时的元件4、布署运行时引擎jBPM提供了多种不同的布署场景：（1）引擎与实例同时使用---jBPM Console（2）用JAVA类实例来实例化引擎5、实例化运行时实例6、监控和审计
2012-07-03 12:27:50
529
转载 Tablespace
What is a Tablespace? Tablespaces is a logical storage unit. It is used to group related logical structures together. What are the Predefined Tablespaces in a database?When you create a new d
2012-07-02 23:20:06
307
转载 Oracle backup
What is archive log mode?The archiving of the redo log is enabled by running database in ARCHIVELOG mode.A group of filled redo log files cannot be reused by LGWR until the group is archived and b
2012-07-02 23:15:37
332
转载 Oracle auditing
Session auditingAuditing can be for an individual user at session level or access level. At access level a single record is created per action and at session level one record is created for all au
2012-07-02 23:14:02
385
转载 Trace file and Default tablespace
What is a trace file and how is it created? The files that are created when an oracle background process encounters an exception are Trace files.Processes like dbwr, lgwr, pmon, smon create them.
2012-07-02 23:13:27
366
转载 Explain the security features in Oracle.
Data abstraction has been achieved in Oracle by separating the client and the server side logic. Therefore the client applications cannot manipulate the data. The triggers perform content based auditi
2012-07-02 23:10:01
275
转载 Difference between SQL*Loader & IMPORT utilities in Oracle
SQL*Loader is a high speed data loading mechanism. It can load data from external files into tables of the database. IMPORT does not support any direct options while SQL*Loader does. Import has mor
2012-07-02 23:05:52
289
转载 Exception in Oracle
Errors occur during runtime processing due to either hardware or network failure or application logic errors are known as exception.Types of Exceptions in OraclePredefined Oracle ExceptionUser
2012-07-02 23:03:36
304
转载 What are the clusters? What are their advantages?
A cluster contains data from one or more tables. All these tables have one or more columns in common. All the rows from all the tables that share the same cluster key.Example: cluster named workers
2012-07-02 22:57:42
239
转载 Trigger in oracle
Triggers are constructs in PL/SQL that need to be just created and associated with a table. Once they are created, when the table associated with it gets updated due to an UPDATE, INSERT or a DELETE,
2012-07-02 22:47:56
310
转载 Function VS Procedure
Functions are typically used to return table variables. Stored procedures cant return table variables however, can create tables. A procedure may or may not return multiple values. A
2012-07-02 22:43:51
336
转载 Explain types of tables in oracle
In Oracle, tables are the basic storage units. There are several types of database tables. Different types of tables have different characteristics.Heap Organized Table:The default table type in O
2012-07-02 22:41:37
310
转载 View the structure of the table and Alter table
1 the command to view the structure of the table.The structure of a table can be viewed using the DESCRIBE TABLE_NAME command. This command shows the entire schema of the table.2 the limitation of
2012-07-02 22:36:31
243
转载 Drop and truncate table command
TRUNCATE removes all rows from a table.The operation cannot be rolled back and no triggers will be fired. The following example will show what a TRUNCATE does: SQL> TRUNCATE TABLE emp; Tab
2012-07-02 22:32:09
308
转载 Differences between GRANT and REVOKE command
By using the GRANT command you can grant an system level previledge or role to another user. The WITH ADMIN OPTION clause permits permits the guarantee to bestow the privilege or role on other users.
2012-07-02 22:30:14
246
转载 TCL command
TCL - Transaction Control: statements used to manage the changes made by DML statements. It allows statements to be grouped together into logical transactions. COMMIT - save work done SAVEPOINT
2012-07-02 22:27:46
353
转载 What are the objects in oracle?
Table, Views, Index, Synonym and Sequence are the objects of oracle.Table: An oracle table is used to store data. A table has columns with each column having a unique name and a data type.Example
2012-07-02 22:24:32
219
翻译 DML command and Index
Data manipulation commands are used to manage data. Using DML command, you can create new records, update records and delete records. The following commands fall in this category.SELECT - retrieve
2012-07-02 22:16:39
325
转载 Tuning and optimizer
Operating system level tuning. System-level tuning involves the following steps:Monitoring the operating system counters using a tool such as top, gtop, and GKrellM or the VTune analyzer’s co
2012-07-02 22:10:29
290
转载 What is proactive tuning and reactive tuning?
Tuning aims to increase and optimize Oracle’s throughput. In Proactive tuning, different strategies are developed for different kinds of processing. Here, the database is tuned by finding the optimal
2012-07-02 22:05:54
310
转载 Describe in brief about oracle database tuning.
Oracle includes many performance tuning enhancements like:Automatic Performance Diagnostic and Tuning Features Automatic Shared Memory Management - Automatic Shared Memory Management puts Oracle i
2012-07-02 22:04:16
347
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