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Currently, I am in charge of developing a data transmission system (DTS stands for data transfer system). I plan to write a seriesArticleTo record the entire process of development, this record can be said to be real-time-I will record it whenever an important problem is encountered or an important problem is solved. Teacher Hou Jie said, "posting is the best memory." In addition to taking notes, th
When using the DTS Wizard for SQL Server 2012 (Import and export data/imports exported data), the following issues occur:No problem when the source data is used directly from the tableHowever, if the source data is a query, the fields will be mapped to (varchar) and 202 (nvarchar)It is said that Microsoft has solved the bug:https://connect.microsoft.com/sqlserver/feedback/details/772761/ Dtswizard-in-sql-2012-sp1-no-longer-recognizes-nvarchar-varchar-
A lot of new Java projects need to be online recently, but a lot of Java related libraries are not very familiar with, the project met with a great deal of resistance, survived for several days of the night. Now the work is basically completed, so I intend to summarize the relevant Java tools library, in the future need to help you, good in Java under the ocean, the waves . (Want to be like a pony in a movie programmer J)The
removal of TCP connections requires sending four packets, so called four waves (Four-way handshake). Either the client or the server can initiate a wave gesture, and in socket programming, any party performs a close () operation to generate a wave. See Wireshark Grab bag, the measured capture results are not strictly according to the wave timing. I reckon the time interval is too short to cause. 1. Establish Connection Agreement (three handshake)(
of initiating active shutdown, the specific process such as:Figure 4 waving at the same timeProcess and status in the already very clear, here no longer repeat, you can refer to the previous four waves wave resolution steps.Iv. notesOn the three-time handshake and four waves usually have a typical face test, which is presented for the needs of the XDJM for reference:(1) What is the three-time handshake or
the fieldDataType.
Here, Microsoft has done a good job. It stores the SQLDataType and Other TypesDataMatching of corresponding fields in databases such as oracle sysbase db2
SELECT * FROM msdb. dbo. MSdatatype_mappings you can find the matching field type here.
6. Next, pray for success.
II,Note:Items
1.Data TransmissionDataThe support is not very good. Big TableDataCannot be simple fromDataVolume definition, some tablesDataLarge, but few columns, dts
modifications made by any other concurrent transaction. When a transaction views the data update, the data is in the state it was in before the other transaction modifies it, or the state after the other transaction modifies it, and the transaction does not view the data in the middle state.
D. Persistence (Durability)
This means that as long as the transaction completes successfully, the updates it makes to the database must be persisted. Even if a system crash occurs, the database can be rest
space.Devm_request_mem_region (pdev->dev, Res_mem->start, Resource_size (RES_MEM),Res_mem->name))Addr_start = Ioremap (Res_mem->start, Resource_size (Res_mem));The return value of Ioremap () is the virtual address of the resource.The resources for IO memory are given in the device tree source file (end of. DTS), the. dts file is used to describe the target board hardware information, and after Uboot is sta
DTS Parameter Passing example
--1. Set up a test table
CREATE TABLE TEMPDB.DBO.TB (id int)
--2. Create a new DTS package
To create in a package:A. Microsoft OLE DB Provider for SQL Server connectionB. Executing SQL tasksThe task's SQL statement is written on: Insert TB values (?)Click the Parameters button to open the Parameter Mapping dialog boxClick the Create global variable button to create a global var
DTS concept, here is not much to say,My example here is OpenWrt DTS; the CPU is 7620;Here's Power_led's Gpio 44First look at the right image:There is a structure called Gpio2,Gpio-base:gpio number of head, base addressNum-gpios:gpio Number of TailsThe whole meaning is gpio40-----gpio72 is belong to Gpio2 this domain inside, Then look at the power of the graph on the left:Gpio = It specifies that the power_l
Object
Using the DTS Wizard for data import and export between SQL Server or two databases by default, import only the exported Table objects and the view objects, such as other objects such as default values, stored procedures, and so on, if you want all database objects to be imported and exported, During the DTS wizard, select Copy objects and data in SQL Server database, and then you can select individu
MACD Head Shoulder TopMACD Head Shoulder BottomStill do not see the wave of friends, may teach you a move not standard but more effective wave judgment method: the MACD Yellow 2 line wear (down) 0 axis of the paragraph of the trend of the default is 1 waves, even if the back of the 2345 waves have not come out , but may wish to look like this. The first gold fork on the 0 axis is the starting point of the t
the system and delete all detected magic waves (Worm. mocbot. a, also known as WORM_IRCBOT.JL), magic wave Variant B (Worm. mocbot. b, also known as WORM_IRCBOT.JK. Trend Micro users must download the latest virus pattern file before scanning the system.
Other Internet users can use Housecall, which is a free online virus scan by Trend Micro. Apply patches this virus uses known vulnerabilities to download and install patches. Avoid using affected pro
= 100
Step 2 B confirm that SYN is received, that is, seq = 100 packets
And want to accept the next packet ACK = 100 + 1 that is 101 packets
At the same time, B will also tell a to randomly generate the initial aeq, such as seq = 300.
Send seq = 300, ACK = 101 packets
Step 3 A receives ACK = 101 from B, and sends its seq = 100 + 1 to B.
At the same time, B is expected to continue to send data packets, then ACK = 300 + 1
In step 2, Ack confirmation and SEQ packet transmission are synchronized.
process given above is called a three-time handshake (three-way handshake).Why does a have to send a confirmation? This is primarily to prevent a failed connection request message from suddenly being sent to B, resulting in an error. Now look at the TCP four waves (release the connection)Now both A and B are in the established state. A's application process first sends a connection release segment to its TCP and stops sending the data, actively shutt
Inspur summit is one of the two good books I expected this year (the other is known as hacker and painter).
In fact, I have read many books about the history of the information industry or the legend of Silicon Valley over the past 10 years. I have also read foreign works and domestic edited works, most of the things are similar to those made up of different things. Almost no instinct is as shocking as the top of the waves. A grand vision and a uniqu
Python implements the method of crawling novels by waves,
This article provides an example of how Python crawls a stream-by-wave novel. Share it with you for your reference. The specific analysis is as follows:
I like to read novels on the Internet. I have been using a novel download reader. I can automatically download the novels I want to read from the Internet to my local location, which is more convenient. Inspired by the Python crawler, I suddenl
first ensure that all data transmitted to a has been transferred before the disconnection, and once the data is transmitted,The Fin field of the reply message is set to 1, and a random seq sequence number is generated. (Fin=1,ack=x+1,seq=z,z generated randomly by the server)4. When the client receives a TCP disconnect request from the server, it responds to the service-side disconnect request, including a randomly generated SEQ field and an ACK field.The ACK field adds 1 to the server-side TCP
your clothes, as shown in the following figure:
New layer, filled with black, layer mode: Multiply, opaque 20%, as shown below:
Find a blue sky and white clouds of material, to extract the cloud, a lot of methods, not introduced. Change the mode, lightness, use a black brush to remove unwanted clouds. The following figure:
Find a source of the waves and extract the waves. Use a black brush to
DTS parameter transfer example
-- 1. Create a test table
Create Table tempdb. DBO. Tb (id int)
-- 2. Create a data transmission package
Create in the package:A. Microsoft ole db provider for SQL Server connectionB. Execute an SQL taskWrite the "SQL statement" of the task: insert TB values (?)Click "parameter" to open the "parameter ing" dialog box.Click the "Create global variable" button to create a global variable named value, whose type is integer
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