mysql导入txt数据文件实例

2013-08-08

若要将大量的数据值插入到数据库的一个或多个表中,使用insert into语句来实现将是一项无聊的工作。  阅读全文...

修改NLS_CHARACTERSET和NLS_NCHAR_CHARACTERSET字符集

2013-07-26

有时候安装oracle未了解清楚需求,设置的字符集导致中文乱码。oracle如何修改字符集呢?  阅读全文...

NLS_NCHAR_CHARACTERSET和NLS_CHARACTERSET的区别

2013-07-26

NLS_CHARACTERSET是数据库字符集,NLS_NCHAR_CHARACTERSET是国家字符集。  阅读全文...

如何安装mysql-5.6.12

2013-07-18

根据自己的操作系统,选择对应的mysql安装包。  阅读全文...

设置NLS_LANG环境变量

2013-07-18

Oracle字符集是一个字节数据的解释的符号集合,有大小之分,有相互的包容关系。ORACLE 支持国家语言的体系结构允许你使用本地化语言来存储,处理,检索数据。它使数据库工具,错误消息,排序次序,日期,时间,货币,数字,和日历自动适应本地化语言和平台。  阅读全文...

Oracle Golden Gate数据库同步技术

2013-07-15

Oracle GoldenGate是一款实时访问、基于日志变化捕捉数据,并且在异构平台之间进行数据传输的产品。利用这个技术,GoldenGate能够实现低延迟、高性能、低影响进行连续的数据集成。  阅读全文...

mysql或oracle合并行函数

2013-07-11

mysql有group_concat函数,oracle有wm_concat函数。  阅读全文...

Oracle InstantClient安装步骤

2013-07-09

Instant Client allows you to run your applications without installing the standard Oracle client or having an ORACLE_HOME. OCI, OCCI, Pro*C, ODBC, and JDBC applications work without modification, while using significantly less disk space than before. Even SQL*Plus can be used with Instant Client. No recompile, no hassle.  阅读全文...

shell sqlplus run sql

2013-06-21

no login sqlplus execute sql from command line   阅读全文...

oracle误删datafile

2013-06-08

维护过程中应尽量避免误操作,多细心都不为过,细心细心再细心。  阅读全文...

mysqld_safe — MySQL Server Startup Script

2013-05-29

mysqld_safe is the recommended way to start a mysqld server on Unix. mysqld_safe adds some safety features such as restarting the server when an error occurs and logging runtime information to an error log file. A description of error logging is given later in this section.   阅读全文...

如何禁用mysql端口3306

2013-05-29

为了安全起见,我们设置mysql端口3306只允许本地访问,或者干脆禁止不开放。  阅读全文...

oracle触发器实例

2013-05-03

触发器(trigger)是个特殊的存储过程,由事件来触发,可对一个表进行(insert,delete, update)操作时激活它执行.对触发器过分的依赖,势必影响数据库的结构,同时增加了维护的复杂程度。  阅读全文...

sql语句处理BLOB

2013-04-22

BLOB二进制大对象(Binary large object) Contains arbitrary bits that represent any kind of data. 是一个可以存储二进制文件的容器。有时候需要用sql语句处理BLOB。  阅读全文...

Drizzle A database for the Cloud

2013-04-15

Drizzle是一个精简版的MySQL分支.Drizzle is a commuity-driven open source project that is forked the popular MySQL database.  阅读全文...