通常,术语"oracle数据库"既用来指存储在硬盘上的内部存有数据的数据库文件,也指用来管理这些文件的内存结构.事实上,术语"数据库"归属于数据文件,而实例则归属于内存结构.
一个实例由SGA(system global area)以及一系列后台进程组成.每一个连接到数据库的用户都是通过一个客户端进程来进行管理的.客户端进程与服务器进程是相联结的,每一个服务器进程都会被分配一块私有的内存区域.称为PGA(process global area).
oracle安装在windows,提示要装.netframework,装好后,感觉就慢了很多.不是需要,闲着装这毛就是找麻烦,相对于装在redhat就方便多了.还是mysql方便...
顺便记一下oracle的spring开发连接配置.
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close"> <property name="driverClass" value="${db.driverClass}" /> <property name="jdbcUrl" value="${db.jdbcUrl}" /> <property name="user" value="${db.user}" /> <property name="password" value="${db.password}" /> <property name="minPoolSize" value="1" /> <property name="maxPoolSize" value="300" /> <property name="maxIdleTime" value="60" /> <property name="acquireIncrement" value="5" /> <property name="idleConnectionTestPeriod" value="60" /> </bean>
----------也顺便记一下h2嵌入式内存数据库---------------
0.pom.xml
<dependency> <groupId>com.h2database</groupId> <artifactId>h2</artifactId> <version>1.3.163</version> <scope>runtime</scope> </dependency>
1.web.xml
<servlet> <servlet-name>h2</servlet-name> <servlet-class>org.h2.server.web.WebServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>h2</servlet-name> <url-pattern>/admin/h2/*</url-pattern> </servlet-mapping>
<jdbc:embedded-database id="dataSource" type="H2"> <jdbc:script location="classpath:/database/h2/calendar-schema.sql"/> <jdbc:script location="classpath:/database/h2/calendar-data.sql"/> </jdbc:embedded-database> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager" p:dataSource-ref="dataSource"/> <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate" p:dataSource-ref="dataSource"/>3.
calendar-schema.sql
create table calendar_users ( id bigint identity, email varchar(256) not null unique, password varchar(256) not null, first_name varchar(256) not null, last_name varchar(256) not null ); create table events ( id bigint identity, when timestamp not null, summary varchar(256) not null, description varchar(500) not null, owner bigint not null, attendee bigint not null, FOREIGN KEY(owner) REFERENCES calendar_users(id), FOREIGN KEY(attendee) REFERENCES calendar_users(id) );calendar-data.sql
insert into calendar_users(id,email,password,first_name,last_name) values (0,'[email protected]','user1','User','1'); insert into calendar_users(id,email,password,first_name,last_name) values (1,'[email protected]','admin1','Admin','1'); insert into calendar_users(id,email,password,first_name,last_name) values (2,'[email protected]','user2','User','2'); insert into events (id,when,summary,description,owner,attendee) values (100,'2013-10-04 20:30:00','Birthday Party','This is going to be a great birthday',0,1); insert into events (id,when,summary,description,owner,attendee) values (101,'2013-12-23 13:00:00','Conference Call','Call with the client',2,0); insert into events (id,when,summary,description,owner,attendee) values (102,'2014-01-23 11:30:00','Lunch','Eating lunch together',1,2);