Oracle Waits event:DB File Scattered Read
The DB File Scattered Read wait event generally indicates waits related to full table scans or fast
full index scans. As full table scans are pulled into memory, they are scattered throughout the
buffer cache, since it is usually unlikely that they fall into contiguous buffers. A large number
indicates that there may be missing or suppressed indexes. This could also be preferred, since it
may be more efficient to perform a full table scan than an index scan. Check to ensure full table
scans are necessary when you see these waits. Try to cache small tables to avoid reading them
into memory over and over again. Locate the data on disk systems that have either more disk
caching or are buffered by the OS file system cache. DB_FILE_MULTIBLOCK_READ_COUNT
can make full scans faster (but it could also influence Oracle to do more of them). You can also
partition tables and indexes so that only a portion is scanned. Slow File I/O (slow disks) can
cause these waits. Correlated to each of the waits are the values for P1,P2,P3=file, block, blocks.
相关文档：
1，查看当前的保护模式
select DATABASE_ROLE,PROTECTION_MODE,PROTECTION_LEVEL from v$database;
2，查看日志的传送方式；
select dest_name,archiver from v$archive_dest;
3，停止standby的自动恢复状态
alter database recover manager standby database finish;
4，添加standby logfile
&nb ......
基于OCI 实现的 最高效dump程序， 比OTL 以及其他的接口都快很多
能执行任何sql , 自动识别字段名和字段类型，进行输出输出
/*
* oracle_dump.cpp
*
* Created on: 2010-2-1
* Author: clm971910@gmail.com
*
* 压缩
* 4216351 dump done
* 完整 106 秒
* 写分隔符 8秒
* 压缩写磁 ......
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 ......
.net调用oracle出现无法加载oramts.dll
在调用oracle时出现无法加载oramts.dll 这时可以尝试以下方法：
先要看在连接字符串中.是否添加了enlist=false;通常不添加这个属性..系统将不会去自动调用oramts.dll
详情请看
将msvcrtd.dll拷到 C:windows\system32\
......
