g*******g
发帖数: 108 | 1 below is posted in google group.
Chinese in North America Oracle User Group (CINAOUG)
com>
============ start the post ==========================================
RAC is like an amplifier, it multiplies both good or bad.
RAC pretty much turns a chunk of application memory requests into network
access requests, so all those access latency will be slower, and the
frontend application will be impacted.
RAC also does nothing to improve IO throughout, it only creates more ac... 阅读全帖 |
|
g*******g
发帖数: 108 | 2 discussion at google group: c*****[email protected]
===============================================================
Scenario -1. I think you are meant IO latency? RAC will help you in this
case.
My thought on RAC in this scenario is that, RAC improves application
throughput, reduces application latency. You have to figure out/determine
what is important to you. I assume CPU, other resources are not the
bottleneck.
Scenario -2. Yes, RAC will guide against a node failure.
... 阅读全帖 |
|
n****f
发帖数: 905 | 3 小孩没娘说来话长。
我个人简单回应一下。 用甲骨文的 VM 一般不是因为要certify。
是因为甲骨文说：“假如你服务器上一共有 40 个 CORE 我们怎么知道你只用了 10 个
CORE 给 Oracle RAC （或者 Oracle Server）?”
所以， 用Oracle VM， 你可以在 40个CORE 的服务器上， 分给 RAC 10 CORE， 并仅
仅付 10 CORE 的费用.
而用 VMWARE 尽管你仅仅为 RAC 分配 10 CORE， 你却必须付给 ORACLE 40 CORE 的
license 费用。 注意， oracle 是按照 CORE charge license fee, NOT socket
number.
其他略去 2 万字 。。。。
总之， 结论是这样， Oracle RAC 完全可以在 VMWARE 上运行， 但是要考虑你的钱包
。 在安装之前，好好看看自己有什么样的 Oracle license。
当然， 个人玩玩就没有这个顾虑了。 |
|
a****l
发帖数: 120 | 4 最近公司打算把数据从windows single instance 迁移到linux RAC，我以前用过expdp
/impdp是可行的，但是比较麻烦，需要在target database，建立tablespace，
datafile，role，user等。
但是我觉得rman更可靠，所以我想用duplicate rman backup；不过问题是每次都出错
。。。
因为问题在于
windows single instance -> linux RAC
要考虑转码，datafile文件存储位置不同，如ASM
请问，各位有过经验吗？我暂时只想到
如果非要rman duplicate，那么可以
windows single instance -> linux single instance -> linux RAC
我实在不知道怎么直接从windows single instance -> linux RAC；还希望各位老师，
多多帮忙，如果有link或者经验，就更好了。
非常感谢。 |
|
b*****r
发帖数: 239 | 5 You can convert to linux rac directly if you already have GI installed and
have shared storage available.
In step 1, you got the converted datafiles from windows, copied to shared
storage in you RAC environment.(you need step2 if you want to use ASM).
Since you got all datafiles, you can adjust the script generated during rman
convert to create control file for RAC. Also change the original spfile to
make it RAC ready. |
|
v*****r
发帖数: 1119 | 6 Nice blog!
I configured a couple of 10g RAC (both are 2 node on Linux) last year to
host a sort of mixed but more DW intensive application. If I turn on LB (
either client side or server side), the performance got hit pretty bad due
to heavy traffic on interconnect (gigabyte switch). I have to disable LB for
for those 10g RACs to pass the performance testing. Now there are both
running well for about 6 month in production without LB. Maybe a bias, but
it seems to me disabling LB might be a best ... 阅读全帖 |
|
a****l
发帖数: 120 | 7 谢谢。很有用。
我正在测试第一步和第二步；但是第三步，不是很明白。
你是说，因为datafile都转好了，然后放到rac的asm里面；接着用rman产生的control
file 和spfile去放到ams里面吗？
能麻烦解释下，这句话吗？
you can adjust the script generated during rman
convert to create control file for RAC. Also change the original spfile to
make it RAC ready.
我没有看明白，谢谢。
rman
to |
|
s*******9
发帖数: 5 | 8 在虚拟机里装了个RAC，发现个问题：
环境是这样的：
oracle virtual box 4.3.14
redhat linux enterprise edition 5.10
oracle rac and oracle clusterware 10.2.0.5.0
crs_stat -t
ora....SM1.asm application ONLINE ONLINE node1
ora....E1.lsnr application ONLINE ONLINE node1
ora.node1.gsd application ONLINE ONLINE node1
ora.node1.ons application ONLINE ONLINE node1
ora.node1.vip application ONLINE ONLINE node1
ora....SM2.asm application ONLINE ONL... 阅读全帖 |
|
j******w
发帖数: 97 | 9 If I had to be a little pessimistic, a RAC certificate provides very little
benefit on how well you do in regulatory. The reason is simple, the
knowledge one gains from studying for the RAC exam is broad (in my opinion
unnecessarily broad), and at too high a level. It does not represent what
one
encounters in a real RA job. If one already knows which area of RA to
venture in, CMC, submission, clinical, labeling, ad/prom, operations, it is
much more helpful for one to read the guidance and study ... 阅读全帖 |
|
|
|
|
g*******g
发帖数: 108 | 13 RAC has high demand for interconnect. enable jumbo frame on the dedicated
interconnect subnet helps with bandwidth related "waiting time".
RAC is good for a well tuned system. It could be performance killer for
poorly tuned application/system.
CINAOUG-- chinese Oracle User Group. |
|
g*******g
发帖数: 108 | 14 discussion at c*****[email protected]
I get my thoughts on RAC based on my experience, I do not remember where I
get the anology "amplifier". I doubt it is from Tom Kyte, he rarely
criticizes an Oralce product, maybe he did/will, i can be hold responsible
for his words :)
Let's focus on the tech side now.
I characterize primary feather of OLTP is "use interaction", queries run
fast and expect few records. Repeatedly used data are cached in the data
buffer.(typically)
In a sequential read w... 阅读全帖 |
|
v*****r
发帖数: 1119 | 15 In reality, RAC performance might have nothing to do with how good the
application is designed and coded. Thinking about this scenario, if ad-hoc
queries are allowed on a well-designed RAC application, that might just crew
up the system if load-balancing is enabled.
Application partition, 嗯嗯，that just implies disabling LB in many cases;
and one of the excuses I used to explain to our clients why I disabled LB
for their production system is, guess what, application partition.
application
not |
|
a****l
发帖数: 120 | 16 谢谢楼上的大牛们；但是这个就是我想到的办法，通过一个linux 机器作为中间件，先
转换平台在转换rac 系统。
那么请问，目前有什么办法可以
直接用windows single 到 linux rac 吗？
直接的命令转换？
谢谢 |
|
y****i
发帖数: 455 | 17 谢谢！为什么p21 protein (Cdc42/Rac)-activated kinase以前名字叫p21(CDKN1A)-
activated kinase? 难道以前发现PAK这基因的时候以为p21(CDKN1A)可以激活的，后来
发现不对，认为是p21 (Cdc42/Rac)激活的？ |
|
w*******d
发帖数: 396 | 18 为什么p21 protein (Cdc42/Rac)-activated kinase以前名字叫p21(CDKN1A)-
activated kinase?
No. There were not such names for those kinases. CDKN1A shows up only in
database annotation.
难道以前发现PAK这基因的时候以为p21(CDKN1A)可以激活的，后来
发现不对，认为是p21 (Cdc42/Rac)激活的？
No. |
|
s*********3
发帖数: 48 | 19 自己没有注册方面工作经验，想考rac，买了网上指定的参考资料，看了一小半吧，感
觉全是需要背的东西，然后从网上找了些题，可是一题都不会做，汗呀～是不是rac考
试主要是需要实际工作经验呢，光看书能考过吗？请考过的前辈们给点经验吧！谢谢拉
～ |
|
l****8
发帖数: 8 | 20 准备考rac，求加入rac 学习小组 和模考题。
谢谢 |
|
v*****r
发帖数: 1119 | 21 配置说明：
2 nodes Oracle RAC using ASM with OCR/vote disks on raw devices
Clusterware: 10.2.0.4
ASM: 10.2.0.4
RDBMS: 10.2.0.4
Operating System: RedHat5.3
Storage: SAN |
|
g*********0
发帖数: 80 | 22 finally finished installations of Oracle 11g R2 RAC on Oracle Enterprise
Linux 5 on VMWare Server 2. The complete screenshots are placed in one PDF
file in the following link:
http://clusterwhere.wordpress.com/
Welcome to critique and comment.
Thanks. |
|
j******5
发帖数: 73 | 23 Oracle document 说 Oracle 11g 只 certify on Oracle VM,
有谁装过Oracle 11g RAC 在VMware 上吗? |
|
|
|
|
b*****r
发帖数: 239 | 27 This is absolutely normal. on RAC environment, like other v$ view v$system_
event is node dependent. You can query gv$ view to get information on each
node. |
|
c*****d
发帖数: 6045 | 28 bridger说的对，看RAC都要用gv$ view，否则只有本机的信息 |
|
y****i
发帖数: 455 | 29 如题。
如果不是的话，怎么p21 protein (Cdc42/Rac)-activated kinase 7以前名字叫p21(
CDKN1A)-activated kinase 7？
谢谢！ |
|
s*****l
发帖数: 1844 | 30 i got RAC for USA, useless basically. |
|
c*********o
发帖数: 1734 | 31 Cong!
Please send it to c*********[email protected]
Baozi sent to you already. Thanks.
chinesegogo，您好：
您转给 flosflos,现金(伪币):10,收取手续费:0.1
同时附加了如下留言给 flosflos.
for RAC material. Thanks
站务
affairs)
。 |
|
c*********o
发帖数: 1734 | 32 Cong!
Please send it to c*********[email protected]
Baozi sent to you already. Thanks.
chinesegogo，您好：
您转给 flosflos,现金(伪币):10,收取手续费:0.1
同时附加了如下留言给 flosflos.
for RAC material. Thanks
站务
affairs)
。 |
|
g*******0
发帖数: 117 | 33 版上有没有今年考RAC的，一起创个group有兴趣吗？ |
|
s*****l
发帖数: 1844 | 34 RAC does not help much, if you do not have working experience.
of |
|
g*******0
发帖数: 117 | 35 版上有没有今年考RAC的，一起创个group有兴趣吗？ |
|
s*****l
发帖数: 1844 | 36 RAC does not help much, if you do not have working experience.
of |
|
E*0
发帖数: 63 | 37 请问有前辈考完五月份的RAC， 愿意卖Fundamentals of US Regulatory Affairs这本
书的吗？ |
|
W*******R
发帖数: 1224 | 38 科普一下什么是RAC？考了有啥用？俺现在在药厂RD部，对将来发展有什么帮助？ |
|
E*0
发帖数: 63 | 39 请问有前辈考完五月份的RAC， 愿意卖Fundamentals of US Regulatory Affairs这本
书的吗？ |
|
W*******R
发帖数: 1224 | 40 科普一下什么是RAC？考了有啥用？俺现在在药厂RD部，对将来发展有什么帮助？ |
|
m**5
发帖数: 729 | 41 如果你想找RA的工作，应该是RA的直接经验。这个RAC作用非常有限，聊胜于无 |
|
E*0
发帖数: 63 | 42 请问有前辈考完今年五月份的RAC， 愿意卖Fundamentals of US Regulatory Affairs
这本
书的吗？万分感谢了 |
|
s*****l
发帖数: 1844 | 43 RAC does not help much. Nobody listens. |
|
|
s*****l
发帖数: 1844 | 45 who knows RAC in China? I feel this is a way for some people to make money. |
|
j******w
发帖数: 97 | 46 Join RAPS (you will have to pay for the membership anyway when you register
for the exam - this may have changed though.)
Join a local RAC exam study group. Call for study group is usually posted on
the RAPS local chapter mailing list.
Get the book "Fundamental of US regulatory affairs" from RAPS.
FDA offers a lot of free training materials.
See here http://www.fda.gov/Training/default.htm
Many people have passed the exam with little or no experience. I think the
passing score is 75% percentile... 阅读全帖 |
|
s**********8
发帖数: 25265 | 47 机会总是啥准备的头脑不是. 我送一些免费的RAC学习资料, 女ID优先.
little
is |
|
|
n***8
发帖数: 39 | 49 准备考秋天的RAC US，在看FUNDAMENTAL。内容繁多，请教各位大虾有木有学习的高招
？ |
|
w***4
发帖数: 302 | 50 请问没有工业界背景，直接考RAC ，能找到工作吗？这个考试有多大用？
谢了！ |
|
