Oracle驱动classes12.jar 与ojdbc14.jar的区别
以下是Oracle JDBC官方文档的说法:
也就是随便翻译一下就理解了。
JDBC Thin for All Platforms
classes12.jar (1,600,090 bytes) - for use with JDK 1.2 and JDK 1.3
在低级JDK版本1.2与1.3中使用的驱动,虽然实际上在1.4,1.5中使用大部分情况也是OK的
classes12_g.jar (2,044,594 bytes) - same as classes12.jar, except that classes were compiled with "javac -g" and contain some tracing information.
添加了编译调试信息的classes12.jar
classes12dms.jar (1,607,745 bytes) - same as classes12.jar, except that it contains additional code`to support Oracle Dynamic Monitoring Service.
添加了支持Oracle动态检测服务的classes12.jar
classes12dms_g.jar (2,052,968 bytes) - same as classes12dms.jar except that classes were compiled with "javac -g" and contain some tracing information.
添加了支持Oracle动态检测服务与编译调试信息的classes12.jar
ojdbc14.jar (1,545,954 bytes) - classes for use with JDK 1.4 and 1.5
在高级JDK版本1.4与1.5中使用的驱动
下面三个同classes12.jar的情况
ojdbc14_g.jar (1,938,906 bytes) - same as ojdbc14.jar, except that classes were compiled with "javac -g" and contain some tracing information.
ojdbc14dms.jar (1,553,561 bytes) - same as ojdbc14.jar, except that it contains additional code`to support Oracle Dynamic Monitoring Service.
ojdbc14dms_g.jar (1,947,136 bytes) - same as ojdbc14dms.jar, except that classes were compiled with "javac -g" and contain some tracing information.
orai18n.jar (1,645,114 bytes) - NLS classes for use with JDK 1.2, 1.3, 1.4, and 1.5. This jar file replaces the old nls_charset jar/zip files.
ons.jar (48,492 bytes) - for use by the pure Java client-side Oracle Notification Services (ONS) deamon.
demo.tar (604,160 bytes) or demo.zip (529,267 bytes) - contains sample JDBC programs.
相关文档:
日常开发活动中,有时候需要对oracle执行计划进行监控,以此来调优程序和数据库方面的性能。
常用方法有以下几种:
一、通过PL/SQL Dev工具
1、直接File->New->Explain Plan Window,在窗口中执行sql可以查看计划结果。其中,Cost表示cpu的消耗,单位为n%,Cardinality表示执行的行数,等价Row ......
表 tree
字段 master
sub
sales
insert into tree values
('主1', '主2', 15);
insert into tree values
('主1', '主3', 20);
insert into tree values
('主2', '主4', 5);
� ......
1. Oracle安装完成后的原始口令?
internal/oracle
sys/change_on_install
system/manager
scott/tiger
sysman/oem_temp
2. ORACLE9IAS WEB CACHE的原始默认用户和密码?
administrator/administrator
3. oracle 8.0.5如何建立数据库?
用orainst。假如有motif界面,能够用orainst /m� ......
表task,字段id_,name_
id_的数据如下形式:
1
1.1
1.1.1
1.1.1.2
1.2
1.2.1
...
10
10.1
10.1.1
10.2.1
10.2.1.1
10.2.1.1.1
10.2.1.1.2
.......
注:“.”标识父子的关系。
现在通过id_查询树结构的效果,并且知道此节点是否为叶子节点leaf。。?
语句如下:
select
......