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Oracle 语法�?OVER (PARTITION BY ..) 及开�H�函�?转蝲

loocky — Tue, 13 Nov 2007 05:33:00 GMT

oracle的分析函数over 及开�H�函�?/div>

一�Q�分析函�?strong style="color: black; background-color: #a0ffff">over
Oracle�?.1.6开始提供分析函敎ͼ�分析函数用于计算��Z��l�的某种聚合��|��它和聚合函数的不同之处是
对于每个�l�返回多行，而聚合函数对于每个组只返回一行�?
下面通过几个例子来说明其应用�?nbsp;

1�Q�统计某商店的营业额�?nbsp;

     date       sale
     1           20
     2           15
     3           14
     4           18
     5           30
    规则�Q�按天统计：每天都统计前面几天的总额
    得到的结果：
    DATE   SALE       SUM
    ----- -------- ------
    1      20        20           --1�?nbsp;
    2      15        35           --1天＋2�?nbsp;
    3      14        49           --1天＋2天＋3�?nbsp;
    4      18        67            .
    5      30        97            .

2:�l�计各班成�W�W�一名的同学信息

    NAME   CLASS S
    ----- ----- ----------------------
    fda    1      80
    ffd    1      78
    dss    1      95
    cfe    2      74
    gds    2      92
    gf     3      99
    ddd    3      99
    adf    3      45
    asdf   3      55
    3dd    3      78

    通过�Q?nbsp;
    --
    select * from
    (
    select name,class,s,rank()over(partition by class order by s desc) mm from t2
    )
    where mm=1
    --
    得到�l�果�Q?br />     NAME   CLASS S                       MM
    ----- ----- ---------------------- ----------------------
    dss    1      95                      1
    gds    2      92                      1
    gf     3      99                      1
    ddd    3      99                      1

    注意�Q?br />     1.在求�W�一名成�l�的时候，不能用row_number()�Q�因为如果同班有两个�q�列�W�一�Q�row_number()只返回一个结�?nbsp;
    2.rank()和dense_rank()的区别是�Q?br />       --rank()是蟩跃排序，有两个第二名时接下来��是�W�四�?br />       --dense_rank()l是连�l�排序，有两个第二名时仍然跟着�W�三�?br />

3.分类�l�计 (�q�显�C�Z��?

    A   B   C
    -- -- ----------------------
    m   a   2
    n   a   3
    m   a   2
    n   b   2
    n   b   1
    x   b   3
    x   b   2
    x   b   4
    h   b   3

   select a,c,sum(c)over(partition by a) from t2
   得到�l�果�Q?br />    A   B   C        SUM(C)OVER(PARTITIONBYA)
   -- -- ------- ------------------------
   h   b   3        3
   m   a   2        4
   m   a   2        4
   n   a   3        6
   n   b   2        6
   n   b   1        6
   x   b   3        9
   x   b   2        9
   x   b   4        9

   如果用sum�Q�group by 则只能得�?br />    A   SUM(C)
   -- ----------------------
   h   3
   m   4
   n   6
   x   9
   无法得到B列�?nbsp;

�Q�＝�Q�＝�Q?/font>

select * from test

数据:
A B C
1 1 1
1 2 2
1 3 3
2 2 5
3 4 6

---��B栏位值相同的对应的C 栏位值加�?br /> select a,b,c, SUM(C) OVER (PARTITION BY B) C_Sum
from test

A B C C_SUM
1 1 1 1
1 2 2 7
2 2 5 7
1 3 3 3
3 4 6 6

---如果不需要已某个栏位的值分�?那就要用 null

eg: ��是��C的栏位值summary 攑֜�每行后面

select a,b,c, SUM(C) OVER (PARTITION BY null) C_Sum
from test

A B C C_SUM
1 1 1 17
1 2 2 17
1 3 3 17
2 2 5 17
3 4 6 17

求个人工资占部门工资的百分比

SQL> select * from salary;

NAME DEPT SAL
---------- ---- -----
a 10 2000
b 10 3000
c 10 5000
d 20 4000

SQL> select name,dept,sal,sal*100/sum(sal) over(partition by dept) percent from salary;

NAME DEPT SAL PERCENT
---------- ---- ----- ----------
a 10 2000 20
b 10 3000 30
c 10 5000 50
d 20 4000 100

二：开�H�函�?nbsp;
      开�H�函数指定了分析函数工作的数据窗口大��，�q�个数据�H�口大小可能会随着行的变化而变化，举例如下�Q?
1�Q?nbsp;
   over�Q�order by salary�Q?按照salary排序�q�行累计�Q�order by是个默认的开�H�函�?br />    over�Q�partition by deptno�Q�按照部门分�?br /> 2�Q?br />   over�Q�order by salary range between 5 preceding and 5 following�Q?br />    每行对应的数据窗口是之前行幅度��g��过5�Q�之后行�q�度��g��过5
   例如:对于以下�?br />      aa
     1
     2
     2
     2
     3
     4
     5
     6
     7
     9

   sum(aa)over�Q�order by aa range between 2 preceding and 2 following�Q?br />    得出的结果是
            AA                       SUM
            ---------------------- -------------------------------------------------------
            1                       10
            2                       14
            2                       14
            2                       14
            3                       18
            4                       18
            5                       22
            6                       18
            7                       22
            9                       9

   ��是��_��对于aa=5的一�?�Q�sum�?nbsp; 5-1<=aa<=5+2 的和
   对于aa=2来说 �Q�sum=1+2+2+2+3+4=14     �Q?br />    又如对于aa=9 �Q?-1<=aa<=9+2 只有9一个数�Q�所以sum=9    �Q?br />
3�Q�其它：
     over�Q�order by salary rows between 2 preceding and 4 following�Q?br />           每行对应的数据窗口是之前2行，之后4�?
4�Q�下面三条语句等效：
     over�Q�order by salary rows between unbounded preceding and unbounded following�Q?br />           每行对应的数据窗口是从第一行到最后一行，�{�效�Q?br />      over�Q�order by salary range between unbounded preceding and unbounded following�Q?br />            �{�效
     over(partition by null)

loocky 2007-11-13 13:33 发表评论

事务与锁的一些�ȝ��

loocky — Thu, 30 Nov 2006 02:36:00 GMT

DML Statement	Row Locks?	Mode of Table Lock
SELECT ... FROM table
*INSERT INTO table* ...**	X	RX
*UPDATE table* ...**	X	RX
*DELETE FROM table* ...**	X	RX
*SELECT ... FROM table* ... FOR UPDATE OF ...**	X	RS-
*LOCK TABLE table* IN ...**
ROW SHARE MODE		RS
ROW EXCLUSIVE MODE		RX
SHARE MODE		S
SHARE EXCLUSIVE MODE		SRX
EXCLUSIVE MODE		X

      事务是用来保证数据的一致性（ integrity �Q�而锁是保证数据的�q�发�Q�控制多个事务的�q�发�Q�（ concurrency �Q��? 锁的�U�别��高�Q�可能会影响数据库的�q�发。锁的��别越低一般来说数据库的�ƈ发越好�? 锁在 JDBC,JTA 以及容器��理的事务中的用法基本一��P��也有写不同，主要�?JTA 分布式事务上个别又差异�?事务只是用来保证�Q�数据一致性，一致性包�?: 能否保证与其他事务的隔离�Q�以及能否在同一事务中保证重复读�Q�脏读，脏写�{�等斚w��? Oracle 在不是手工加锁的情况下， ORACLE 会自动调度锁�?ORACLE 自动调度锁得执行��序�Q�一般不会发生死锁现象。有些数据库会自动调度数据库锁得�U�别�Q�这��增加了死锁的可能， ORACLE 永远不会自动调度锁的�U�别�Q�死锁发生时�Q?oracle 也会去自动调度，�q�要延时一�D�|��_�� ORACLE 自己的策略，�?ROLLBACK 一个事务，以保证发生死锁的 2 个事务都执行下去�? 锁的�U�类很多�Q�有 DML,DDL 锁以及其他，�q�x��我们开发过�E�中主要�?DML,DDL 锁�?DML 锁又分很多方面：
RS: row share RX: row exclusive S: share SRX: share row exclusive X: exclusive
�Q?1 �Q?RS 可以通过一下声明方式来锁定表的�?
SELECT ... FROM table ... FOR UPDATE OF ... ;

LOCK TABLE table IN ROW SHARE MODE;

一旦被 RS 锁定�Q�不允许再对表进�?LOCK TABLE table IN EXCLUSIVE MODE

�Q?2 �Q?RX 可以通过一下声明方式来锁定表的�?
INSERT INTO table ... ;

UPDATE table ... ;

DELETE FROM table ... ;

LOCK TABLE table IN ROW EXCLUSIVE MODE;
一旦通过 RX 锁定了表中的行，不允许对表进行下列操�?

LOCK TABLE table IN SHARE MODE;

LOCK TABLE table IN SHARE EXCLUSIVE MODE;

LOCK TABLE table IN EXCLUSIVE MODE;

�Q?3 �Q?s �Q?share table lock �Q�可以通过以下方式锁定�?
LOCK TABLE table IN SHARE MODE �Q�可以说有多�?S 锁定一个表�Q?;
允许�q�行的操作，所有的查询以及 SELECT ... FOR UPDATE, �?LOCK TABLE ... IN SHARE MODE �Q�只允许本事务内更新数据�Q?update �Q�这�U�情况也是只允许当前表上��׃��?S 锁）
不允许的操作
LOCK TABLE table IN SHARE ROW EXCLUSIVE MODE;

LOCK TABLE table IN EXCLUSIVE MODE;

LOCK TABLE table IN ROW EXCLUSIVE MODE;
�Q?4 �Q?SRX 通过以下方式锁定�?
LOCK TABLE table IN SHARE ROW EXCLUSIVE MODE;
�?S ��了一点，�q�里只是允许一�?SRX 锁定一个表
不允许的操作�Q?
LOCK TABLE table IN SHARE MODE;

LOCK TABLE table IN SHARE ROW EXCLUSIVE MODE;

LOCK TABLE table IN ROW EXCLUSIVE MODE;

LOCK TABLE table IN EXCLUSIVE MODE;
�Q?5 �Q?X �U�别最高的锁定形式�Q?LOCK TABLE table IN EXCLUSIVE MODE;
只允许其他事�?QUERY 不允许其他操作�?

Table 13-4 Locks Obtained By DML Statements
DML Statement Row Locks? Mode of Table Lock
SELECT ... FROM table
INSERT INTO table ... X RX
UPDATE table ... X RX
DELETE FROM table ... X RX
SELECT ... FROM table ...    FOR UPDATE OF ... X RS-
LOCK TABLE table IN ...
ROW SHARE MODE RS
ROW EXCLUSIVE MODE RX
SHARE MODE S
SHARE EXCLUSIVE MODE SRX
EXCLUSIVE MODE X



�q�个表上很清�?

loocky 2006-11-30 10:36 发表评论

oracle 事务隔离�U�别,用jdbc体验

loocky — Thu, 16 Nov 2006 05:48:00 GMT

摘要: 做技术支�? 2 个月了，也就是说�? 2 个月没有��C��码了�Q�手都很生了�Q�最�q�遇到项目大的�ƈ发问题，数据也有些不太正��，��想��C��目中，�׃��模块�q�多�Q�异步的情况也有发生�Q�所以想��C��务与锁的相关知识�Q�先写一点事务相关的理解�Q�然后写一炚w��相关的东西，以便加深自己的理解�? ... 阅读全文

loocky 2006-11-16 13:48 发表评论

ubuntu下面安装oracle10g(�?

loocky — Mon, 23 Oct 2006 03:13:00 GMT

(1) �Q?/span> ubuntu 6.06

(2): �׃�� ubuntu �?/span> debian 的内核，所以要�?/span> oracle 官方上下�?/span> oracle-xe-universal_10.2.0.1-1.0_i386.deb

开始安�?先看下面要注意的问题�Q�第四项)

1:dpkg –I oracle-xe-universal_10.2.0.1-1.0_i386.deb

出现一下问�?/span>

正在解压�~�将用于更替的包文�g oracle-xe-universal ...

dpkg �Q�依赖关�p�问题��?span lang="EN-US"> oracle-xe-universal 的配�|�工作不能��l�：

oracle-xe-universal 依赖�?span lang="EN-US"> libaio (>= 0.3.96) | libaio1 (>= 0.3.96)�Q�然而：

软�g�?span lang="EN-US"> libaio�q�没有被安装�?span lang="EN-US">

软�g�?span lang="EN-US"> libaio1�q�没有被安装�?span lang="EN-US">

dpkg �Q�处�?span lang="EN-US"> oracle-xe-universal (--install)时出错：

依赖关系问题 - 仍未被配�|?span lang="EN-US">

在处理时有错误发生：

oracle-xe-universal

原来�?span lang="EN-US">libaio�~�少�Q�没有安装，我就下蝲下来�Q�是�?span lang="EN-US">rpm�Q�然后安装这�?span lang="EN-US">rpm�Q?span lang="EN-US">

sudo apt-get libaio-0.3.96-7.i386.rpm

正在��d��软�g包列�?span lang="EN-US">... 完成

正在分析软�g包的依赖关系�?span lang="EN-US">... 完成

E: 无法扑ֈ�软�g�?span lang="EN-US"> libaio-0.3.96-7.i386.rpm

真是郁闷反复试验都不�?span lang="EN-US">

攑ּ��q�样安装�Q�到�|�上查找其他�Ҏ��安装libaio

�|�上说采�?span lang="EN-US">apt-get -f install安装方式可能自动获取�?span lang="EN-US">

apt-get -f install 果然可以日志如下

root@ubuntu:/home/oem# apt-get -f install

正在��d��软�g包列�?span lang="EN-US">... 完成

正在分析软�g包的依赖关系�?span lang="EN-US">... 完成

正在更正依赖关系... 完成

��会安装下列额外的��Y件包�Q?span lang="EN-US">

libaio1

下列【新】��Y件包��被安装�Q?span lang="EN-US">

libaio1

共升�U�了 0 个��Y件包�Q�新安装�?span lang="EN-US"> 1 个��Y件包�Q�要卸蝲 0 个��Y件包�Q�有 7 个��Y件未被升�U��?span lang="EN-US">

�?span lang="EN-US"> 1 个��Y件包没有被完全安装或卸蝲�?span lang="EN-US">

需要下�?span lang="EN-US"> 5182B 的��Y件包�?span lang="EN-US">

解压�~�后会消耗掉 61.4kB 的额外空间�?span lang="EN-US">

您希望��l�执行吗�Q?span lang="EN-US">[Y/n]y

获取�Q?span lang="EN-US">1 http://mirror.lupaworld.com dapper/main libaio1 0.3.104-1ubuntu6 [5182B]下蝲 5182B�Q�耗时 2s (2346B/s)

选中了曾被取消选择的��Y件包 libaio1�?span lang="EN-US">

( 正在��d��数据�?span lang="EN-US"> ... �pȝ��当前��d��安装�?span lang="EN-US"> 76207 个文件和目录�?span lang="EN-US">)

正在解压�~?span lang="EN-US"> libaio1 (�?span lang="EN-US"> .../libaio1_0.3.104-1ubuntu6_i386.deb) ...

正在讄�� libaio1 (0.3.104-1ubuntu6) ...

正在讄�� oracle-xe-universal (10.2.0.1-1.0) ...

Executing Post-install steps...

You must run '/etc/init.d/oracle-xe configure' as the root user to configure the database.

2 �Q?span lang="EN-US">

root@ubuntu:/home/oem# /etc/init.d/oracle-xe configure

Oracle Database 10g Express Edition Configuration

-------------------------------------------------

This will configure on-boot properties of Oracle Database 10g Express

Edition. The following questions will determine whether the database should

be starting upon system boot, the ports it will use, and the passwords that

will be used for database accounts. Press to accept the defaults.

Ctrl-C will abort.

Specify the HTTP port that will be used for Oracle Application Express [8080]:8080

Specify a port that will be used for the database listener [1521]:1521

Specify a password to be used for database accounts. Note that the same

password will be used for SYS and SYSTEM. Oracle recommends the use of

different passwords for each database account. This can be done after

initial configuration:

Confirm the password:

Do you want Oracle Database 10g Express Edition to be started on boot (y/n) [y]:y

Starting Oracle Net Listener...Done

Configuring Database...

Starting Oracle Database 10g Express Edition Instance...Done

Installation Completed Successfully.

To access the Database Home Page go to "http://127.0.0.1:8080/apex"

�q�就安装完了�Q�真是不可思以�Q�比9I快很多啊�Q��d��׃��10几分钟，中间的配�|�少了好多啊�?span lang="EN-US">

3 �Q�访问数�?span lang="EN-US">

http://127.0.0.1:8080/apex

�Ҏ��讄��的密码没有问题，能够正确讉K��

4: 需要注意的问题�Q?span lang="EN-US">

在刚开始安装的时候可能出��C��下问�?span lang="EN-US">

root@ubuntu:/home/oem# dpkg -i oracle-xe-universal_10.2.0.1-1.0_i386.deb

选中了曾被取消选择的��Y件包 oracle-xe-universal�?span lang="EN-US">

( 正在��d��数据�?span lang="EN-US"> ... �pȝ��当前��d��安装�?span lang="EN-US"> 73613 个文件和目录�?span lang="EN-US">)

正在解压�~?span lang="EN-US"> oracle-xe-universal (�?span lang="EN-US"> oracle-xe-universal_10.2.0.1-1.0_i386.deb) ...

This system does not meet the minimum requirements for swap space. Based on

the amount of physical memory available on the system, Oracle Database 10g

Express Edition requires 750 MB of swap space. This system has 711 MB

of swap space. Configure more swap space on the system and retry the installation.

dpkg �Q�处�?span lang="EN-US"> oracle-xe-universal_10.2.0.1-1.0_i386.deb (--install)时出错：

子进�E?span lang="EN-US">·pre-installation script·�q�回了错误号·1

在处理时有错误发生：

oracle-xe-universal_10.2.0.1-1.0_i386.deb

�q�个问题是由�?span lang="EN-US">SWAP分区不够的原因造成的，那就增加一�?span lang="EN-US">SWAP分区

1 �Q�采用文件的方式增加swap分区

Dd if=/dev/zero of=/tmp/tmp.swap bs=1M count =100( 建立一�?st1:chmetcnv w:st="on" tcsc="0" numbertype="1" negative="False" hasspace="False" sourcevalue="100" unitname="m">100M的文�?span lang="EN-US">)

mkswap /tmp/tmp.swap( 标识swap文�g)

swapon /tmp/tmp.swap( �Ȁ�z?span lang="EN-US">swap)

修改/etc/fstab文�g增加一�?span lang="EN-US">

/tmp/tmp.swap swap swap defaluts 0 0

Swapon –s 查看当前�?span lang="EN-US">swap分区情况

发现已经�?span lang="EN-US">2�?span lang="EN-US">SWAP分区了，�I�间�q�下子够了，可以�l�箋安装�?span lang="EN-US">

2 �Q�也可已采用直接增加SWAP方式�Q�我没有采用�q�样的办法）

loocky 2006-10-23 11:13 发表评论

lnx_920_disk1.cpio.gz要这栯��压！

loocky — Wed, 18 Oct 2006 10:00:00 GMT

先用gunzip lnx_920_disk1.cpio.gz

cpio -idmv < lnx_920_disk1.cpio

loocky 2006-10-18 18:00 发表评论

oracle 学习(6)

loocky — Thu, 20 Jul 2006 07:56:00 GMT

��查点�Q�checkpoint�Q�的工作机制

��查点是一个数据库事�g�Q�它把修�Ҏ��据从高速缓存写入磁盘，�q�更新控制文件和数据文�g�?/p>

��查点分�ؓ三类�Q?br />1�Q�局部检查点�Q�单个实例执行数据库所有数据文件的一个检查点操作�Q�属于此实例的全部脏�~�存区写入数据文件�?br />触发命��o�Q?br />svmrgrl>alter system checkpoint local;
�q�条命��o昄��的触发一个局部检查点�?br />2�Q�全局��查点�Q�所有实例（对应�q�行数据服务器）执行数据库所有所有数据文件的一个检查点操作�Q�属于此实例的全部脏�~�存区写入数据文件�?br />触发命��o
svrmgrl>alter system checkpoint global;
�q�条命��o昄��的触发一个全局��查点�?br />3�Q�文件检查点�Q�所有实例需要执行数据文仉��的一个检查点操作�Q�如使用热备份命令alter tablespace USERS begin backup�Q�或表空间脱机命令alter tablespace USERS offline�Q�将执行属于USERS表空间的所有数据文件的一个检查点操作�?/p>

��查点处理步骤�Q?br />1�Q�获取实例状态队列：实例状态队列是在实例状态�{变时获得�Q�ORACLE获得此队列以保证��查点执行期间�Q�数据库处于打开状态；
2�Q�获取当前检查点信息�Q�获取检查点记录信息的结构，此结构包括当前检查点旉��、活动线�E�、进行检查点处理的当前线�E�、日志文件中恢复截止点的地址信息�Q?br />3�Q�缓存区标识�Q�标识所有脏�~�存区，当检查点扑ֈ�一个脏�~�存区就��其标识为需�q�行��h��Q�标识的脏缓存区��q��l�进�E�DBWR�q�行写操作，��脏�~�存区的内容写入数据文�g�Q?br />4�Q�脏�~�存区刷斎ͼ�DBWR�q�程��所有脏�~�存区写入磁盘后�Q�设�|�一标志�Q�标识已完成脏缓存区至磁盘的写入操作。系�l�进�E�LGWR与CKPT�q�程��l�进行检查，直至DBWR�q�程�l�束为止�Q?br />5�Q�更新控制文件与数据文�g�?br />注：控制文�g与数据文件头包含��查点�l�构信息�?br />在两�U�情况下�Q�文件头中的��查点信息�Q�获取当前检查点信息�Ӟ��不做更斎ͼ�
1�Q�数据文件不处于热备份方式，此时ORACLE��不知道操作�pȝ��何时读文�g��_��而备份拷贝在拯��开始时必须��h��查点SCN�Q?br />ORACLE在数据文件头中保留一个检查点的记数器�Q�在正常操作中保证��用数据文件的当前版本�Q�在恢复旉��止恢复数据文件的错误版本�Q�即使在热备份方式下�Q�计数器依然是递增的；每个数据文�g的检查点计数器，也保留在控制文�g相对应数据文仉��中�?br />2�Q�检查SCN��于文�g头中的检查点SCN的时候，�q�表明由��查点产生的改动已�l�写到磁盘上�Q�在执行全局��查点的处理过�E�中�Q�如果一个热备䆾快速检查点在更新文件头�Ӟ��则可能发生此�U�情��c��应该注意的是，ORACLE是在实际�q�行��查点处理的大量工作之前捕��h��查SCN的，�q�且很有可能被一条象热备份命�?alter tablespace USERS begin backup�q�行快速检查点处理时的命��o打断�?br />ORACLE在进行数据文件更��C��前，��验证其数据一致性，当验证完成，��x��新数据文件头以反映当前检查点的情况；未经验证的数据文件与写入时出现错误的数据文�g都被忽略�Q�如果日志文件被覆盖�Q�则�q�个文�g可能需要进行介质恢复，在这�U�情况下�Q�ORACLE�pȝ��q�程DBWR��此数据文�g脱机�?/p>

��查点��法描述�Q?br />脏缓存区用一个新队列链接�Q�称为检查点队列。对�~�存区的每一个改动，都有一个与其相关的重做倹{��检查点队列包含脏的日志�~�存区，�q�些�~�存区按照它们在日志文�g中的位置排序�Q�即在检查点队列中，�~�存区按照它们的低重做��D��行排序。需要注意的是，�׃��~�存区是依照�W�一�ơ变脏的�ơ序链接到队列中的，所以，如果在缓存区写出之前对它有另外的改动�Q�链接不能进行相应变��_��~�存��Z��旦被链接到检查点队列�Q�它��停留在此位�|�，直到��它被写��Zؓ止�?/p>

ORACLE�pȝ��q�程DBWR在响应检查点��h��Ӟ��按照�q�个队列的低重做值的升序写出�~�存区。每个检查点��h��指定一个重做��|��一旦DBWR写出的缓存区重做值等于或大雨��查点的重做��|��查点处理卛_��成，�q�将记录到控制文件与数据文�g�?br />�׃��查点队列上的�~�存区按照低重做��D��行排序，而DBWR也按照低重做值顺序写出检查点�~�存区，故可能有多个��查点��h��处于�z�d��状态，当DBWR写出�~�存区时�Q�检查位于检查点队列前端的缓存区重做��g��查点重做值的一致性，如果重做值小于检查点队列前缓存区的低重做值的所有检查点��h��Q�即可表�C�处理完成。当存在未完成的�z�d��查点��h��Ӟ��DBWR�l�箋写出��查点�~�存区�?/p>

��法特点�Q?br />1�Q�DBWR能确切的知道为满��x��查点��h��需要写那些�~�存区；
2�Q�在每次�q�行��查点写时保证指向完成最早的�Q�具有最低重做值的�Q�检查点�Q?br />3�Q�根据检查点重做值可以区别多个检查点��h��Q�然后按照它们的��序完成处理�?/p>

SQL> show parameter log_check;

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
log_checkpoint_interval              integer     0
log_checkpoint_timeout               integer     1800
log_checkpoints_to_alert             boolean     FALSE
SQL> select checkpoint_change# from v$database;

CHECKPOINT_CHANGE#
------------------
928767

�Q�＃�Q�＃�Q�＃�Q�＃�Q�＃�Q�＃�Q�＃�Q�＃�Q�＃�Q�＃�Q�＃�Q�＃�Q�＃

今天学习�q�程中遇��C��下问�?/p>

SQL> alter database open;
alter database open
*
ERROR 位于�W?1 �?
ORA-01113: 文�g 1 需要介质恢�?br />ORA-01110: 数据文�g 1: 'E:\ORACLE\ORADATA\TESTABC\SYSTEM01.DBF'

#################################
改�ؓ非归档模�?br />archive log stop;

#################################

SQL> recover database;
完成介质恢复�?br />SQL> alter database open;

数据库已更改�?/p>

可以OPERN了，

#################################
查看数据文�g的状�?/p>

SQL> select name,status from v$datafile;

##################################

loocky 2006-07-20 15:56 发表评论

OMS启动��h��的�ȝ��!

loocky — Tue, 04 Jul 2006 05:58:00 GMT

1 �Q?/span> agent,tnslistener 都启动�v来， OracleServiceTESTDB 实例也在服务里面启动��h��?/span>

2 �Q?/span> oem 档案库也建立好了�Q�就建立�?/span> OracleServiceTESTDB 数据库上

3 �Q�万事具备了�Q�启�?/span> OracleOraHome92ManagementServer, 报异常出�?/span>

服务器后又停止了�Q�一些服务自动停止，如果他们没什么可做得�Q�例如性能日志和警报服�?/span>

郁闷�?/span>

接下来我做了一下事�?/span>

1 �Q�重新徏立了档案库，然后启动 OracleOraHome92ManagementServer 仍然没有成功

2 �Q?/span> ,TNSLISTNER �Q?/span> OracleOraHome92ManagementServer �Q?/span> OracleServiceTESTDB �Q?/span> AGENT 都设�|�成自动启动�Q�重新启动了机器�?仍然没有成功

3 �Q�重新安装了 ORACLE 然后重新做了以上事情�Q�仍然没有成�?/span>

�Ҏ��|�上得资料和自己得实践发��C��下问�?/span>

1 �Q?br />我自己得机器是�\由器�l�得 IP �Q�不是自己机器设定得固定 IP �Q�在 XP 下面搜烦�?/span> C:

Hosts 文�g�Q��\�?/span> C:\WINDOWS\system32\drivers\etc\hosts

127.0.0.1 localhost

10.200.7.71 USER-3286972EF7

把分配给自己�?/span> IP �Q�和自己得主机名对应一下，��是说加上第二行�Q�然后重新启动机器，

OMS ��启动�v来了�Q?br />2:
我搜索了注册表里�?/span> OracleOraHome92ManagementServer �?/span>

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\OracleOraHome92ManagementServer DependOnService 数值数据对应到 OracleServiceTESTDB, 要是不对应一定要修改注册表让他对应�v来，��是说一定要又依赖关�p�！�Q�！�Q�否则成功不�?/span>

��M�� 2 条：

1 �Q�动�?/span> IP 一定要对应��L��?/span>

2 �Q�注册表里面得依赖关�p�M��定要依赖当前档案库所在得服务上就�?/span> OracleServiceTESTDB 上面�Q�！�Q�！

loocky 2006-07-04 13:58 发表评论

oracle oms启动不了,错误如下

loocky — Wed, 28 Jun 2006 08:10:00 GMT

OMA启动不�v来，把资料库用EMCA配置在当前的数据库上了，然后启动OMA怎么也启动不��h��Q?br />    提示�Q?br />
     服务器启动后又停止了。一些服务自动停止，如果他们没有什么可做的�Q�例�?性能日志和警�?服务


    日志�Q�OMS.NOHUP

    java.lang.NullPointerException:
at oracle.sysman.vxx.vxxo.VxxoEMORB.getName(VxxoEMORB.java:735)
at oracle.sysman.vxx.vxxo.VxxoEMORB.deregister(VxxoEMORB.java:467)
at oracle.sysman.vdg.VdgAgentGatewayImpl.killService(VdgAgentGatewayImpl.java:599)
at oracle.sysman.vxa.VxaAppServer.connectionLost(VxaAppServer.java:1482)
at oracle.sysman.vdg.VdgAgentGatewayImpl.initiateExitAndRestart(VdgAgentGatewayImpl.java:689)
at oracle.sysman.vdg.vdgConn.VdgConnection.pollForConnectionEvents(VdgConnection.java:2087)
at oracle.sysman.vdg.vdgConn.VdgListenThread.inConnPollLoop_(VdgListenThread.java:427)
at oracle.sysman.vdg.vdgConn.VdgListenThread.run(VdgListenThread.java:362)
at oracle.sysman.vtaGallery.threadPoolManager.WorkerThread.run(Worker.java:271)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.connectionLost(VxaAppServer.java:1474)
at oracle.sysman.vdg.VdgAgentGatewayImpl.initiateExitAndRestart(VdgAgentGatewayImpl.java:689)
at oracle.sysman.vdg.vdgConn.VdgConnection.pollForConnectionEvents(VdgConnection.java:2087)
at oracle.sysman.vdg.vdgConn.VdgListenThread.inConnPollLoop_(VdgListenThread.java:427)
at oracle.sysman.vdg.vdgConn.VdgListenThread.run(VdgListenThread.java:362)
at oracle.sysman.vtaGallery.threadPoolManager.WorkerThread.run(Worker.java:271)
java.lang.NullPointerException:
at oracle.sysman.vdb.VdbSessionFactory.checkForEmptyCreds(VdbSessionFactory.java:588)
at oracle.sysman.vdb.VdbSessionFactory.getPrivateAutoCommitSession(VdbSessionFactory.java:1261)
at oracle.sysman.vds.VdsImpl.getSystemAutoCommitSession(VdsImpl.java:1013)
at oracle.sysman.vds.VdsImpl.getPrivateAutoCommitSession(VdsImpl.java:955)
at oracle.sysman.vdg.vdgStore.VdgDbConnection.getRepositoryAutoSession(VdgDbConnection.java:84)
at oracle.sysman.vdg.vdgStore.VdgNodeStore.getPingNodes(VdgNodeStore.java:372)
at oracle.sysman.vdg.VdgPingManager.getNodes(VdgPingManager.java:411)
at oracle.sysman.vdg.VdgPingManager.run(VdgPingManager.java:661)
at oracle.sysman.vtaGallery.threadPoolManager.WorkerThread.run(Worker.java:271)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.connectionLost(VxaAppServer.java:1474)
at oracle.sysman.vdg.VdgAgentGatewayImpl.initiateExitAndRestart(VdgAgentGatewayImpl.java:689)
at oracle.sysman.vdg.vdgConn.VdgConnection.pollForConnectionEvents(VdgConnection.java:2087)
at oracle.sysman.vdg.vdgConn.VdgListenThread.inConnPollLoop_(VdgListenThread.java:427)
at oracle.sysman.vdg.vdgConn.VdgListenThread.run(VdgListenThread.java:362)
at oracle.sysman.vtaGallery.threadPoolManager.WorkerThread.run(Worker.java:271)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.connectionLost(VxaAppServer.java:1474)
at oracle.sysman.vdg.VdgAgentGatewayImpl.initiateExitAndRestart(VdgAgentGatewayImpl.java:689)
at oracle.sysman.vdg.vdgConn.VdgConnection.pollForConnectionEvents(VdgConnection.java:2087)
at oracle.sysman.vdg.vdgConn.VdgListenThread.inConnPollLoop_(VdgListenThread.java:427)
at oracle.sysman.vdg.vdgConn.VdgListenThread.run(VdgListenThread.java:362)
at oracle.sysman.vtaGallery.threadPoolManager.WorkerThread.run(Worker.java:271)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.connectionLost(VxaAppServer.java:1474)
at oracle.sysman.vdg.VdgAgentGatewayImpl.initiateExitAndRestart(VdgAgentGatewayImpl.java:689)
at oracle.sysman.vdg.vdgConn.VdgConnection.pollForConnectionEvents(VdgConnection.java:2087)
at oracle.sysman.vdg.vdgConn.VdgListenThread.inConnPollLoop_(VdgListenThread.java:427)
at oracle.sysman.vdg.vdgConn.VdgListenThread.run(VdgListenThread.java:362)
at oracle.sysman.vtaGallery.threadPoolManager.WorkerThread.run(Worker.java:271)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.connectionLost(VxaAppServer.java:1474)
at oracle.sysman.vdg.VdgAgentGatewayImpl.initiateExitAndRestart(VdgAgentGatewayImpl.java:689)
at oracle.sysman.vdg.vdgConn.VdgConnection.pollForConnectionEvents(VdgConnection.java:2087)
at oracle.sysman.vdg.vdgConn.VdgListenThread.inConnPollLoop_(VdgListenThread.java:427)
at oracle.sysman.vdg.vdgConn.VdgListenThread.run(VdgListenThread.java:362)
at oracle.sysman.vtaGallery.threadPoolManager.WorkerThread.run(Worker.java:271)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.connectionLost(VxaAppServer.java:1474)
at oracle.sysman.vdg.VdgAgentGatewayImpl.initiateExitAndRestart(VdgAgentGatewayImpl.java:689)
at oracle.sysman.vdg.vdgConn.VdgConnection.pollForConnectionEvents(VdgConnection.java:2087)
at oracle.sysman.vdg.vdgConn.VdgListenThread.inConnPollLoop_(VdgListenThread.java:427)
at oracle.sysman.vdg.vdgConn.VdgListenThread.run(VdgListenThread.java:362)
at oracle.sysman.vtaGallery.threadPoolManager.WorkerThread.run(Worker.java:271)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.connectionLost(VxaAppServer.java:1474)
at oracle.sysman.vdg.VdgAgentGatewayImpl.initiateExitAndRestart(VdgAgentGatewayImpl.java:689)
at oracle.sysman.vdg.vdgConn.VdgConnection.pollForConnectionEvents(VdgConnection.java:2087)
at oracle.sysman.vdg.vdgConn.VdgListenThread.inConnPollLoop_(VdgListenThread.java:427)
at oracle.sysman.vdg.vdgConn.VdgListenThread.run(VdgListenThread.java:362)
at oracle.sysman.vtaGallery.threadPoolManager.WorkerThread.run(Worker.java:271)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.connectionLost(VxaAppServer.java:1474)
at oracle.sysman.vdg.VdgAgentGatewayImpl.initiateExitAndRestart(VdgAgentGatewayImpl.java:689)
at oracle.sysman.vdg.vdgConn.VdgConnection.pollForConnectionEvents(VdgConnection.java:2087)
at oracle.sysman.vdg.vdgConn.VdgListenThread.inConnPollLoop_(VdgListenThread.java:427)
at oracle.sysman.vdg.vdgConn.VdgListenThread.run(VdgListenThread.java:362)
at oracle.sysman.vtaGallery.threadPoolManager.WorkerThread.run(Worker.java:271)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.connectionLost(VxaAppServer.java:1474)
at oracle.sysman.vdg.VdgAgentGatewayImpl.initiateExitAndRestart(VdgAgentGatewayImpl.java:689)
at oracle.sysman.vdg.vdgConn.VdgConnection.pollForConnectionEvents(VdgConnection.java:2087)
at oracle.sysman.vdg.vdgConn.VdgListenThread.inConnPollLoop_(VdgListenThread.java:427)
at oracle.sysman.vdg.vdgConn.VdgListenThread.run(VdgListenThread.java:362)
at oracle.sysman.vtaGallery.threadPoolManager.WorkerThread.run(Worker.java:271)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.connectionLost(VxaAppServer.java:1474)
at oracle.sysman.vdg.VdgAgentGatewayImpl.initiateExitAndRestart(VdgAgentGatewayImpl.java:689)
at oracle.sysman.vdg.vdgConn.VdgConnection.pollForConnectionEvents(VdgConnection.java:2087)
at oracle.sysman.vdg.vdgConn.VdgListenThread.inConnPollLoop_(VdgListenThread.java:427)
at oracle.sysman.vdg.vdgConn.VdgListenThread.run(VdgListenThread.java:362)
at oracle.sysman.vtaGallery.threadPoolManager.WorkerThread.run(Worker.java:271)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.connectionLost(VxaAppServer.java:1474)
at oracle.sysman.vdg.VdgAgentGatewayImpl.initiateExitAndRestart(VdgAgentGatewayImpl.java:689)
at oracle.sysman.vdg.vdgConn.VdgConnection.pollForConnectionEvents(VdgConnection.java:2087)
at oracle.sysman.vdg.vdgConn.VdgListenThread.inConnPollLoop_(VdgListenThread.java:427)
at oracle.sysman.vdg.vdgConn.VdgListenThread.run(VdgListenThread.java:362)
at oracle.sysman.vtaGallery.threadPoolManager.WorkerThread.run(Worker.java:271)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.connectionLost(VxaAppServer.java:1474)
at oracle.sysman.vdg.VdgAgentGatewayImpl.initiateExitAndRestart(VdgAgentGatewayImpl.java:689)
at oracle.sysman.vdg.vdgConn.VdgConnection.pollForConnectionEvents(VdgConnection.java:2087)
at oracle.sysman.vdg.vdgConn.VdgListenThread.inConnPollLoop_(VdgListenThread.java:427)
at oracle.sysman.vdg.vdgConn.VdgListenThread.run(VdgListenThread.java:362)
at oracle.sysman.vtaGallery.threadPoolManager.WorkerThread.run(Worker.java:271)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.connectionLost(VxaAppServer.java:1474)
at oracle.sysman.vdg.VdgAgentGatewayImpl.initiateExitAndRestart(VdgAgentGatewayImpl.java:689)
at oracle.sysman.vdg.vdgConn.VdgConnection.pollForConnectionEvents(VdgConnection.java:2087)
at oracle.sysman.vdg.vdgConn.VdgListenThread.inConnPollLoop_(VdgListenThread.java:427)
at oracle.sysman.vdg.vdgConn.VdgListenThread.run(VdgListenThread.java:362)
at oracle.sysman.vtaGallery.threadPoolManager.WorkerThread.run(Worker.java:271)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.connectionLost(VxaAppServer.java:1474)
at oracle.sysman.vdg.VdgAgentGatewayImpl.initiateExitAndRestart(VdgAgentGatewayImpl.java:689)
at oracle.sysman.vdg.vdgConn.VdgConnection.pollForConnectionEvents(VdgConnection.java:2087)
at oracle.sysman.vdg.vdgConn.VdgListenThread.inConnPollLoop_(VdgListenThread.java:427)
at oracle.sysman.vdg.vdgConn.VdgListenThread.run(VdgListenThread.java:362)
at oracle.sysman.vtaGallery.threadPoolManager.WorkerThread.run(Worker.java:271)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.connectionLost(VxaAppServer.java:1474)
at oracle.sysman.vdg.VdgAgentGatewayImpl.initiateExitAndRestart(VdgAgentGatewayImpl.java:689)
at oracle.sysman.vdg.vdgConn.VdgConnection.pollForConnectionEvents(VdgConnection.java:2087)
at oracle.sysman.vdg.vdgConn.VdgListenThread.inConnPollLoop_(VdgListenThread.java:427)
at oracle.sysman.vdg.vdgConn.VdgListenThread.run(VdgListenThread.java:362)
at oracle.sysman.vtaGallery.threadPoolManager.WorkerThread.run(Worker.java:271)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.connectionLost(VxaAppServer.java:1474)
at oracle.sysman.vdg.VdgAgentGatewayImpl.initiateExitAndRestart(VdgAgentGatewayImpl.java:689)
at oracle.sysman.vdg.vdgConn.VdgConnection.pollForConnectionEvents(VdgConnection.java:2087)
at oracle.sysman.vdg.vdgConn.VdgListenThread.inConnPollLoop_(VdgListenThread.java:427)
at oracle.sysman.vdg.vdgConn.VdgListenThread.run(VdgListenThread.java:362)
at oracle.sysman.vtaGallery.threadPoolManager.WorkerThread.run(Worker.java:271)
oracle.sysman.vxx.vxxo.VxxoNameNotFoundException: VXX-2009 : 无法扑ֈ�服务上下�?br /> at oracle.sysman.vxx.vxxo.VxxoEMORB.getNextBindName(VxxoEMORB.java:813)
at oracle.sysman.vxx.vxxo.VxxoEMORB.bind(VxxoEMORB.java:333)
at oracle.sysman.vxa.VxaAppServer.cacheServiceIOR(VxaAppServer.java:1904)
at oracle.sysman.vxa.VxaAppServer.main(VxaAppServer.java:3150)
exception VxaInvalidStateException{wstring reason="VXA-3032 : \?25\?76\?50 ORB \?12\?21\?32 OMS \?15\?41\?66\?72\?31\?02\?43\?50\?63\?55 oms";}
at oracle.sysman.vxa.VxaAppServer.main(VxaAppServer.java:3152)

启动 Oracle Management Server 时出错。java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.stopServices(VxaAppServer.java:1406)
at oracle.sysman.vxa.VxaAppServer.exit(VxaAppServer.java:2533)
at oracle.sysman.vxa.VxaAppServer.main(VxaAppServer.java:3166)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.stopServices(VxaAppServer.java:1406)
at oracle.sysman.vxa.VxaAppServer.exit(VxaAppServer.java:2533)
at oracle.sysman.vxa.VxaAppServer.main(VxaAppServer.java:3166)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.stopServices(VxaAppServer.java:1406)
at oracle.sysman.vxa.VxaAppServer.exit(VxaAppServer.java:2533)
at oracle.sysman.vxa.VxaAppServer.main(VxaAppServer.java:3166)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.stopServices(VxaAppServer.java:1406)
at oracle.sysman.vxa.VxaAppServer.exit(VxaAppServer.java:2533)
at oracle.sysman.vxa.VxaAppServer.main(VxaAppServer.java:3166)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.stopServices(VxaAppServer.java:1406)
at oracle.sysman.vxa.VxaAppServer.exit(VxaAppServer.java:2533)
at oracle.sysman.vxa.VxaAppServer.main(VxaAppServer.java:3166)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.stopServices(VxaAppServer.java:1406)
at oracle.sysman.vxa.VxaAppServer.exit(VxaAppServer.java:2533)
at oracle.sysman.vxa.VxaAppServer.main(VxaAppServer.java:3166)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.stopServices(VxaAppServer.java:1406)
at oracle.sysman.vxa.VxaAppServer.exit(VxaAppServer.java:2533)
at oracle.sysman.vxa.VxaAppServer.main(VxaAppServer.java:3166)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.stopServices(VxaAppServer.java:1406)
at oracle.sysman.vxa.VxaAppServer.exit(VxaAppServer.java:2533)
at oracle.sysman.vxa.VxaAppServer.main(VxaAppServer.java:3166)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.stopServices(VxaAppServer.java:1406)
at oracle.sysman.vxa.VxaAppServer.exit(VxaAppServer.java:2533)
at oracle.sysman.vxa.VxaAppServer.main(VxaAppServer.java:3166)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.stopServices(VxaAppServer.java:1406)
at oracle.sysman.vxa.VxaAppServer.exit(VxaAppServer.java:2533)
at oracle.sysman.vxa.VxaAppServer.main(VxaAppServer.java:3166)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.stopServices(VxaAppServer.java:1406)
at oracle.sysman.vxa.VxaAppServer.exit(VxaAppServer.java:2533)
at oracle.sysman.vxa.VxaAppServer.main(VxaAppServer.java:3166)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.stopServices(VxaAppServer.java:1406)
at oracle.sysman.vxa.VxaAppServer.exit(VxaAppServer.java:2533)
at oracle.sysman.vxa.VxaAppServer.main(VxaAppServer.java:3166)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.stopServices(VxaAppServer.java:1406)
at oracle.sysman.vxa.VxaAppServer.exit(VxaAppServer.java:2533)
at oracle.sysman.vxa.VxaAppServer.main(VxaAppServer.java:3166)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.stopServices(VxaAppServer.java:1406)
at oracle.sysman.vxa.VxaAppServer.exit(VxaAppServer.java:2533)
at oracle.sysman.vxa.VxaAppServer.main(VxaAppServer.java:3166)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.stopServices(VxaAppServer.java:1406)
at oracle.sysman.vxa.VxaAppServer.exit(VxaAppServer.java:2533)
at oracle.sysman.vxa.VxaAppServer.main(VxaAppServer.java:3166)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.stopServices(VxaAppServer.java:1406)
at oracle.sysman.vxa.VxaAppServer.exit(VxaAppServer.java:2533)
at oracle.sysman.vxa.VxaAppServer.main(VxaAppServer.java:3166)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.stopServices(VxaAppServer.java:1406)
at oracle.sysman.vxa.VxaAppServer.exit(VxaAppServer.java:2533)
at oracle.sysman.vxa.VxaAppServer.main(VxaAppServer.java:3166)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.stopServices(VxaAppServer.java:1406)
at oracle.sysman.vxa.VxaAppServer.exit(VxaAppServer.java:2533)
at oracle.sysman.vxa.VxaAppServer.main(VxaAppServer.java:3166)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.stopServices(VxaAppServer.java:1406)
at oracle.sysman.vxa.VxaAppServer.exit(VxaAppServer.java:2533)
at oracle.sysman.vxa.VxaAppServer.main(VxaAppServer.java:3166)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.stopServices(VxaAppServer.java:1406)
at oracle.sysman.vxa.VxaAppServer.exit(VxaAppServer.java:2533)
at oracle.sysman.vxa.VxaAppServer.main(VxaAppServer.java:3166)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.connectionLost(VxaAppServer.java:1474)
at oracle.sysman.vdg.VdgAgentGatewayImpl.initiateExitAndRestart(VdgAgentGatewayImpl.java:689)
at oracle.sysman.vdg.vdgConn.VdgConnection.pollForConnectionEvents(VdgConnection.java:2087)
at oracle.sysman.vdg.vdgConn.VdgListenThread.inConnPollLoop_(VdgListenThread.java:427)
at oracle.sysman.vdg.vdgConn.VdgListenThread.run(VdgListenThread.java:362)
at oracle.sysman.vtaGallery.threadPoolManager.WorkerThread.run(Worker.java:271)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.connectionLost(VxaAppServer.java:1474)
at oracle.sysman.vdg.VdgAgentGatewayImpl.initiateExitAndRestart(VdgAgentGatewayImpl.java:689)
at oracle.sysman.vdg.vdgConn.VdgConnection.pollForConnectionEvents(VdgConnection.java:2087)
at oracle.sysman.vdg.vdgConn.VdgListenThread.inConnPollLoop_(VdgListenThread.java:427)
at oracle.sysman.vdg.vdgConn.VdgListenThread.run(VdgListenThread.java:362)
at oracle.sysman.vtaGallery.threadPoolManager.WorkerThread.run(Worker.java:271)
java.lang.NullPointerException:
at java.util.Hashtable.get(Hashtable.java:259)
at oracle.sysman.vxa.VxaAppServer.connectionLost(VxaAppServer.java:1474)
at oracle.sysman.vdg.VdgAgentGatewayImpl.initiateExitAndRestart(VdgAgentGatewayImpl.java:689)
at oracle.sysman.vdg.vdgConn.VdgConnection.pollForConnectionEvents(VdgConnection.java:2087)
at oracle.sysman.vdg.vdgConn.VdgListenThread.inConnPollLoop_(VdgListenThread.java:427)
at oracle.sysman.vdg.vdgConn.VdgListenThread.run(VdgListenThread.java:362)
at oracle.sysman.vtaGallery.threadPoolManager.WorkerThread.run(Worker.java:271)
"Could not start management server. Initialization failure"
该如何解�?/p>

我安装的�?�?�?�?�?版本�Q�系�l�XP

loocky 2006-06-28 16:10 发表评论

loocky — Tue, 16 May 2006 07:37:00 GMT

1 �Q?/span> oracle 不支�?/span> read uncomitted 方式

2 �Q?/span> read-only 不是sql92标准�Q?span lang="EN-US">readonly的好处是提高了数据库的效率，readonly的同时又允许DML操作�Q�我原来以�ؓreadonly��׃��允许DML操作数据库了�?span lang="EN-US">

3 �Q?span lang="EN-US">read committed �?span lang="EN-US">serializable的一些区别与联系

1 �Q�都看不到脏数据

2 �Q?span lang="EN-US">read committed 不能够重复读�Q��?span lang="EN-US">serializable能够重复读，�Q�重复读的意思就是，在一个事务中多次��d��一条被被的事务提高的数据（COMMITE�Q?span lang="EN-US">serializable看不刎ͼ��Q�）

3 �Q�隔��ȝ��度越高，数据库的�q�发性越差；隔离�E�度��低�Q�数据库的�ƈ发性越好。也��是说你要的数据准确一致性好�Q�就要牺牲一些数据的效率胃代��L��

4 �Q?/span> 如果有在serializable事务开始时未提交的事务�?span lang="EN-US">serializable事务�l�束之前修改�?span lang="EN-US">serializable事务��要修改的行�q�进行了提交�Q�则serializable事务提交的时候回法场发生无法序列化访问的错误

loocky 2006-05-16 15:37 发表评论

A query with LOB's requires Net8, which is not detected on this PC

loocky — Thu, 13 Apr 2006 00:53:00 GMT

Ø Exit TOAD Launch TOAD On the Login screen their should be an option to
> use 'SQL Net compatible Net8' Please check this

问题��p��决了呵呵�Q�可能是要求兼容以前的ORACLE的用法，现在��L��了就好了�Q�没有问题了

loocky 2006-04-13 08:53 发表评论