折腾了几天,终于把Oracle 11G安装在服务器上并且能正常运行了。于是今天把简要的安装步骤和安装时候遇到的问题记录下,以后备用
折腾了几天,终于把Oracle 11G安装在服务器上并且能正常运行了。于是今天把简要的安装步骤和安装时候遇到的问题记录下,以后备用。
在oracle网站上注册下载linux 64bit的安装包(好像只有64bit的),注意系统一定要是64bit的 不然你就是在浪费时间。
首先说一下,本人的系统是CentOS5 我曾经实验过在Ubuntu 12.04 以及amazon EC2(8G 硬盘免费版)上安装,都因为各种原因没有成功,大家有兴趣的可以实验一下。网上有很多指导帖子。
在安装之前要注意,oracle对于系统的空间是有要求的,安装前可以查看下:
使用free -m查看交换空间大小,oracle XE 要求至少有1.2G 的交换空间,扩充的方法在我另外一篇博文上已经说明。传送门
使用df -h查看tmpfs的大小,oracle XE 在init.ora文件中给出了最低要求,默认是1G 。
这里我们要把tmpfs扩充为2G:
1.修改/etc/fstab文件:
找到此行:tmpfs /dev/shm tmpfs defaults 0 0
修改为: tmpfs /dev/shm tmpfs defaults,size=2048M 0 0
2.重新加载tmpfs:
使用命令:
#umount /dev/shm; mount /dev/shm;
然后输入
df -h /dev/shm查看输出:
Filesystem Size Used Avail Use% Mounted on
tmpfs 2.0G 492M 1.6G 25% /dev/shm
说明重新加载成功。 【Linux公社 】
做完这些,我们还要做一些安装一些依赖包:
sudo yum install libaio*
来安装libaio包
之后解压安装包,
unzip oracle-xe-11.2.0-1.0.x86_64.rpm.zip
进入Disk1文件夹
安装解压后的rpm包
rpm -ivh oracle-xe-11.2.0-1.0.x86_64.rpm
安装成功后会提示成功,然后以super user身份运行以下脚本进行配置:
# /etc/init.d/oracle-xe configure
包括http的端口,如果你的服务器上运行了tomcat 而且没有改过端口配置 要把默认的8080端口换掉以免冲突。
另外,程序还会要求你为默认管理员账户 sys 设置密码。随后会等待一段时间,请耐心。
安装结束后,系统会自动建立一个名为oracle的用户,,home dir位置在 /u01/app/oracle 也就是数据库安装的位置。
为了使用方便,我们可以把个人用户home目录下的.bashrc 和.bash_profile拷贝到该目录下,再用chown改变文件所属:
# chown oracle .bash_profile
# chown oracle .bashrc
# chmod 755 .bash_profile
# chmod 755 .bashrc
之后, 我们要设置一下环境变量:
修改/etc/profile文件,添加如下内容:
# Oracle Settings
TMP=/tmp; export TMP
TMPDIR=$TMP; export TMPDIR
ORACLE_BASE=/u01/app/oracle; export ORACLE_BASE
ORACLE_HOME=$ORACLE_BASE/product/11.2.0/xe; export ORACLE_HOME
ORACLE_SID=XE; export ORACLE_SID
ORACLE_TERM=xterm; export ORACLE_TERM
PATH=/usr/sbin:$PATH; export PATH
PATH=$ORACLE_HOME/bin:$PATH; export PATH
TNS_ADMIN=$ORACLE_HOME/network/admin
LD_LIBRARY_PATH=$ORACLE_HOME/lib:/lib:/usr/lib; export LD_LIBRARY_PATH
CLASSPATH=$ORACLE_HOME/jlib:$ORACLE_HOME/rdbms/jlib; export CLASSPATH
if [ $USER = "oracle" ]; then
if [ $SHELL = "/bin/ksh" ]; then
ulimit -p 16384
ulimit -n 65536
else
ulimit -u 16384 -n 65536
fi
fi
注意:以下几点:
XE版本里只能有一个instance, 我将SID修改了以后貌似会报错,所以SID就不用修改了。
BASE和HOME两个变量后尽量不要加斜线 '/' ,有可能会报错,虽然不知到为什么... 同时,TNS_ADMIN这个变量一定要有。
修改完后使用命令 # source /etc/profile 重新加载改文件。
输入 echo $ORACLE_BASE修改是否成功。

MySQL is suitable for beginners to learn database skills. 1. Install MySQL server and client tools. 2. Understand basic SQL queries, such as SELECT. 3. Master data operations: create tables, insert, update, and delete data. 4. Learn advanced skills: subquery and window functions. 5. Debugging and optimization: Check syntax, use indexes, avoid SELECT*, and use LIMIT.

MySQL efficiently manages structured data through table structure and SQL query, and implements inter-table relationships through foreign keys. 1. Define the data format and type when creating a table. 2. Use foreign keys to establish relationships between tables. 3. Improve performance through indexing and query optimization. 4. Regularly backup and monitor databases to ensure data security and performance optimization.

MySQL is an open source relational database management system that is widely used in Web development. Its key features include: 1. Supports multiple storage engines, such as InnoDB and MyISAM, suitable for different scenarios; 2. Provides master-slave replication functions to facilitate load balancing and data backup; 3. Improve query efficiency through query optimization and index use.

SQL is used to interact with MySQL database to realize data addition, deletion, modification, inspection and database design. 1) SQL performs data operations through SELECT, INSERT, UPDATE, DELETE statements; 2) Use CREATE, ALTER, DROP statements for database design and management; 3) Complex queries and data analysis are implemented through SQL to improve business decision-making efficiency.

The basic operations of MySQL include creating databases, tables, and using SQL to perform CRUD operations on data. 1. Create a database: CREATEDATABASEmy_first_db; 2. Create a table: CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY, titleVARCHAR(100)NOTNULL, authorVARCHAR(100)NOTNULL, published_yearINT); 3. Insert data: INSERTINTObooks(title, author, published_year)VA

The main role of MySQL in web applications is to store and manage data. 1.MySQL efficiently processes user information, product catalogs, transaction records and other data. 2. Through SQL query, developers can extract information from the database to generate dynamic content. 3.MySQL works based on the client-server model to ensure acceptable query speed.

The steps to build a MySQL database include: 1. Create a database and table, 2. Insert data, and 3. Conduct queries. First, use the CREATEDATABASE and CREATETABLE statements to create the database and table, then use the INSERTINTO statement to insert the data, and finally use the SELECT statement to query the data.

MySQL is suitable for beginners because it is easy to use and powerful. 1.MySQL is a relational database, and uses SQL for CRUD operations. 2. It is simple to install and requires the root user password to be configured. 3. Use INSERT, UPDATE, DELETE, and SELECT to perform data operations. 4. ORDERBY, WHERE and JOIN can be used for complex queries. 5. Debugging requires checking the syntax and use EXPLAIN to analyze the query. 6. Optimization suggestions include using indexes, choosing the right data type and good programming habits.


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