Study Notes

In the morning, Mr King gave us training about memory including DDR and DDR2.

The differences between DDR and DDR2 is DDR2 run faster and has lower working voltage. Some type memory named Rambus, assumed by Intel in 2001, encapsulated in another way.Though Rambus failed in Chinese market in the past three years, many experts thought it will be useful in the future computer systems.

Samsung, Hyrix are the first line manufactor which have good reputation, their products sells very well. In fact, all memery are product in the same working line, however, just like the CPU, they are tested and given a mark as 400Mhz if it is very good, or 333Mhz if it is just OK, and so on.

Registy Memory has register chipset on the PCB which maybe 6 layers or 4 layers. The register chipset buffers the data put in the memory so that Memory will work more stable if a large number of memory would have been requested.

Linux is the best suitable operating system for oracle, only the following OS was certificated by Oracle:

Red Hat Enterprise Linux 4 (RHEL 4), RHEL 3, RHEL 2.1,

Novell SUSE Linux Enterprise Server 9(SLES 9), SLES 8

if recomplie the kernel or use the third-party tools to modify the kernel, Oracle does not supply the unbreakable support. Oracle said there are so many Linux distribution all around the world, it is impossible to certificated every Linux distributions.

As we all know, Tencent Co. used Slackware Linux, which type of database would be instaledl in their servers? DB2, or Sysbase?

I’ve never seen IBM server with AIX through I heard many people said IBM machine was huge and stable.

Load Balancing test, there are totally seven servers as node. 192.168.1.231 acted as the load balancing server,and the others are really workstations whose ip is from 192.168.1.232 to 192.168.1.237.

238 was the loading server which supply the testing pressure.

First, install MS SQL server 2000 in every realy workstations, and let the sql server startup when completed installation.

The engineer from Nanning decided the strategy of cluster and send commands to our server(231) thought moderm which called remote control. About 40 squel instants was started to connect virtual database (192.168.1.231).

In the 231 machine, I could see the statue about connecing and re-connecting,192.168.1.231 is always the server node,and it distributed the load to the other node such as 192.168.1.232 and/or 192.168.1.233.

There are many strategy in the software which is sent to test in the lab. One strategy is that the PC or customer workstation will always connect to the specific node once it was firstly distributed to the node by the 192.168.1.231. Because some people may do some working in one of the nodes, when the node halted, the data the user are working were not committed, so it perhapes lost. we could not imagine what would happen if the important data lost. this accident need the strategy that ensure custmer always connect to the specific server.

Another strategy is random. The customer’s connect will be distributed to random node. With the count of connecting adds, the loading will be balancing automaticly.

By the way, how to setting the display parameter to 1024×768 in Linux? Only changing the parameter in the display dialog is not enough. Login as root, in the /etc/X11 direction, edit the X1186config file by using vi, find the line including”800×600″ “640 x480”, and insert “1024×768” in this line. saved the file, and logout.

Everything will be ok when login as root again.

Install Linux without swap partition and root partition?

The answer is yes.

There are some trouble when install marvell in Intel 7520BD2 platform. custom required Red Hat AS 2.1(2.4.9) as the operating system, however, the marvell driver is developed on 2.4.13 kernel. when forced insert drivers, the following messages displayed: must update your system kernel.

After downloaded the drivers from intel website. I user vi tools to modify the program, and changed the kernel from 13 to 9.

Saved and rebooted, but how disapointed I am. the experice failed.

Ok, I’ll try again.

Today, my MSN blog starts up.

It will be a good platform for people who are insterest in Oracle RAC technology.and some stories about myself also will be writen here. I wish it would be my spirit home in the internet.

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