oracle raw devices
1.LVM:
[root@vmfs ~]# pvdisplay
--- Physical volume ---
PV Name /dev/sdg
VG Name db_v4
PV Size 2.00 GB / not usable 0
Allocatable yes
PE Size (KByte) 4096
Total PE 511
Free PE 1
Allocated PE 510
PV UUID MlB8lE-H3DL-RCcf-p5Di-J6A2-INLc-zw328m
--- Physical volume ---
PV Name /dev/sdf
VG Name db_v3
PV Size 2.00 GB / not usable 0
Allocatable yes
PE Size (KByte) 4096
Total PE 511
Free PE 115
Allocated PE 396
PV UUID 2KsemU-DsQQ-GR8k-nnR2-Zm7M-nUCb-yXuUR5
--- Physical volume ---
相关文档：
一：无返回值的存储过程
1、建立存储过程
CREATE OR REPLACE PROCEDURE TESTA(PARA1 IN VARCHAR2,PARA2 IN VARCHAR2) AS
BEGIN
INSERT INTO T_TEST (I_ID,I_NAME) VALUES (PARA1, PARA2);
END TESTA;
2、相应的JAVA程序
import java.sql.*;
import java.io.OutputStream;
import java.io.Writer;
import java.sq ......
Ms sql 2000
drivername=com.microsoft.jdbc.sqlserver.SQLServerDriver
url=jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=books
username=sa
password=sa
MySQL
drivername=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost/books
username=root
password=root
Oracle
drivername=orac ......
输入参数：str ——要截取的字符串, ch——要查找的字符串
截取ch之前（不包括ch）的字符串： substr(str, 0, instr(str, ch) - 1)
截取ch之后（不包括ch）的字符串： substr(str, , instr(str, ch) + 1, length(str)) ......
15. /*+USE_CONCAT*/
对查询中的WHERE后面的OR条件进行转换为UNION ALL的组合查询. (懵懂啊,先存着)
例如:
select /*+use_concat */ * from emp where deptno=10 OR empno=7788;
Execution Plan
----------------------------------------------------------
0 S ......
1、查询两个日期之间的数据。
假设有表Table1，其创建表的sql语句为：
create table Table1(
StationID NUMBER(10) Primary key,
Year NUMBER(4) not null,
Month NUMBER(2) n ......
