controller (the disk array controller is optional. skip this step if you have not purchased a disk array Controller)
If you have an adaptec disk array controller (PERC 2, perc2/Si, perc3/Si, perc3/di), you will see the following information during system boot self-check:Dell poweredge expandable RAID Controller 3/di, BIOS v2.7-X [Build XXXX] (c) 1998-2002 adaptec, Inc. all rights reserved.
If you have an AMI/LSI disk array controller (perc2/SC
Dell PowerEdge R720 (Xeon E5-2609/2 GB/300 GB) rack mount server CPU with Xeon E5-2609 2.4 GHz standard 1 CPU, 2 gb ecc DDR3 memory capacity, standard GB hard disk capacity.
Dell PowerEdge R720 (Xeon E5-2609/2 Gbit/300 GB)
The Dell PowerEdge R720 (Xeon E5-2609/2 GB/300 GB) server is designed with a 2U rack structure with a newly released Xeon E5-2609 proces
. (generally used to reload the system or do not install the operating system to create a container (Adaptec array card)/logical drive (Ami/lsi array card).Use the Configuration tool software provided by the third party to implement the management of the card. such as Dell Array Manager. (These software is used on the server already has the operating system installed)Third, correctly identify the model of your array card (in this case, Dell, in fact, are similar)Identify your disk array controll
. (generally used to reload the system or do not install the operating system to create a container (Adaptec array card)/logical drive (Ami/lsi array card).Use the Configuration tool software provided by the third party to implement the management of the card. such as Dell Array Manager. (These software is used on the server already has the operating system installed)Third, correctly identify the model of your array card (in this case, Dell, in fact, are similar)Identify your disk array controll
for NIC 1 also sets PXE. Because the network cable is not connected to Nic 1, this setting will cause an error to find the installation source.
So, enter system settings, set PXE on Nic 4, Nic 1 does not set boot, Nic 4 boot is set to PXE.
Then, after rebooting, you find the PXE installation source for the LAN.
Note: PXE mode installation is in BIOS mode, not UEFI mode.
Resources:How to Install a Operating System on the Dell PowerEdge ServersHttp://w
Download MongoDB's latest Linux release and put it in any directory (for example, in the/usr directory)
Unzip to perform
Tar zxvf mongodb-linux-x86_64-2.x.x.tgzCd/usr/mongodb-linux-x86_64-2.x.x/bin
Create a link
Ln-s/usr/mongodb-linux-x86_64-2.x.x MongoDBHowever, before running, you need to create a directory of data and logs that MongoDB needs:sudo mkdir-p/data/db/journalsudo chmod-r 777/data/db/The MongoDB server,-journal represents the Write log,-maxconns=
, resulting in a non-repeatable read problem3. Repeatable READING(1) Open a client A, and set the current transaction mode to repeatable read, query table account(2) Before client A's transaction commits, open another client B, update the table account and submit(3) In client A, perform step (1) of the query:(4) The Execution Step (1), Lilei balance is still 400 and step (1) Query results consistent, no non-repeatable reading problem; then update balance = balance-50 WHERE id = 1,balance not bec
step, resulting in a non-repeatable read problem3. Repeatable READING(1) Open a client A, and set the current transaction mode to repeatable read, query table account(2) Before client A's transaction commits, open another client B, update the table account and submit(3) In client A, perform step (1) of the query:(4) The Execution Step (1), Lilei balance is still 400 and step (1) Query results consistent, no non-repeatable reading problem; then update balance = balance-50 WHERE id = 1,balance no
previous step, resulting in a non-repeatable read problem3. Repeatable READING(1) Open a client A, and set the current transaction mode to repeatable read, query table account(2) Before client A's transaction commits, open another client B, update the table account and submit(3) In client A, perform step (1) of the query:(4) The Execution Step (1), Lilei balance is still 400 and step (1) Query results consistent, no non-repeatable reading problem; then update balance = balance-50 WHERE id = 1,b
query in step (1) on Client:
(4) in step 1, the balance of lilei is still 400 consistent with the query result of step (1), and there is no problem of repeated reading; then execute update balance = balance-50 where id = 1, balance does not change to 400-50 = 350, and the balance value of lilei is calculated using 350 in step (2, so it's 300. Data Consistency is not broken. It's amazing. Maybe it's a special feature of mysql.
mysql> select * from account;+------+--------+---------+| id | name
Plot summary:[Machine Xiao Wei] in the [engineer Ah Wei] accompanied by the practice of acoustic avatar.This time to study is [Chinese pinyin].Star Calendar May 09, 2016 16:16:57, the Milky Way Galaxy Earles the Chinese Empire Jiangnan Line province.[Engineer Ah Wei] is working with [machine Xiao Wei] to study [Pinyin in Chinese].#生成声波数据def tmp2_2 (): Print (' Generate waveform start. >>> '); fout= open (' Output.txt ', ' W '); #普通话元音, turbid consonants frequence = [[1000,1400,2400],
It is decided that machine learning is under system learning, and Stanford courseware is the main line.
Notes1 is part of the http://www.stanford.edu/class/cs229/notes/cs229-notes1.pdf about Regression 1. Linear Regression
For example, if the House Price is predicted and the data cannot be found on the Internet, use five data points for the experiment.
House.txt, 5 data records, number of bedrooms, Price.
Area bedrooms price2104 3 4001600 3 3302400 3 3691416 2 2323000 4 540
Use R to
In php, the keyword is automatically extracted from the document content. seo optimizes the website functions. Using the basic conditions of discuz, the keyword is automatically extracted from the article content. in this way, the function method 1 of the link in the website is optimized: the keywords extracted in this method are closer to functiongetkey ($ contents) {// $ rows = stri php, which automatically extracts the keyword of the article content. the Function Method of seo to optimize the
Rate
1920x1080 x 480 (3 x 640 x 480)
60, 75, 85Hz
2400 x 480 (3 x 480 x)
60Hz
2400 x (3 x 600 x)
60, 75, 85Hz
3072 x 768 (3 x 1024x768 x 768)
60, 75, 85Hz
3840 x 720 (3 x 720 x)
60Hz
3840 x 768 (3 x 768 x)
60Hz
3840 x (3 x 800 x)
60Hz
3840 x 960 (3 x 960
The last two days I wrote an article in A5 called: "keyword index 2400 in 40 days ranked 6th case sharing" which tells me the new station in 40 days How to do keywords: e-Smoke (4th), Baidu Index 2400 related pages about 2,990,000 keywords: health e-cigarette (ranking 2nd), Baidu Index 730 related Web page about 1,720,000 articles, sorry, the last article I left a hand, but the focus of a stroke, there is n
Automatically extract article content keywords in php function method of SEO optimized website
The paper uses the basic condition of discuz to extract the keywords automatically, and then optimizes the function method of the chain in the website . The key word extracted by this method is close
function Getkey ($contents) { //$rows = Strip_tags ($contents); $arr = Array (",", "\s", "\ r \ n", "\ n", "\ r", "\ T", "> ", "“", "”","$QC _rows = Str_replace ($arr, ', $rows), if (strlen ($QC _rows)
db_block_size
"Minimum Time for Undo Data Storage"Can be found through the system parameter undo_retention query (900 s by default)
Show parameter undo_retention
And"Longest SQL running time"Can be determined by the following methods:
Select max (sum (elapsed_seconds) from V $ session_longops group by SID, serial #, SQL _id
The space required for Undo can be calculated by inputting the above numbers into the formula.
For example
The average number of Undo data blocks generated per second is 10
In php, the keyword is automatically extracted from the document content. seo optimizes the website functions. Using the basic conditions of discuz, the keyword is automatically extracted from the article content. in this way, the function method 1 of the link in the website is optimized: the keywords extracted by this method are close to functiongetkey ($ contents) {$ rowsstrip_tags ($ contents); $ arrarray (, s, and php automatically extract the keyword in the article content. function method
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