byod meaning

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The meaning of the Java volatile keyword is described in detail

is expected for volatile-modified variables. The JVM virtual machine only guarantees that the values loaded from the main memory to the working memory of the thread are up to date, for example, if thread 1, thread 2, in the read,load operation, discovers that the value of count in main memory is 5, then the latest value is loaded thread 1 heap count is modified, Writes to main memory, and the count variable in main memory becomes 6 thread 2 because the read,load operation has already been perfo

Linux ipcs field meaning shared memory delete ipcs dest State __linux

View Shared Memory [App_usr@js2test01 shell]$ IPCS------Shared Memory Segments--------Key shmid owner perms bytes nattch Status0X0122F9DF 12419074 app_usr 666 70604918 00x0001b3ef 14450693 app_usr 666 70604278 00x0003d09a 14385158 app_usr 666 67732 1 Meaning of each field: The first column is the shared memory key; The second column is the number of shared memory shmid; The third column is the user owner of the creation; The fourth column is the perm

The meaning of ulimit-a output on AIX

AIX on ulimit-a the meaning of the output The system resource constraints used by AIX users include two concepts---hard limits (hard limits) and soft limits (soft limits).Hard limits has been introduced since the AIX 4.1 release. Hard limits should be set by the AIX system administrator, and only members of the security group can increase this value.The user itself can reduce this qualification, but its changes will expire as the user exits from the

Xcode the left navigation bar in accordance with the meaning of the detailed _ios

Xcode to the left navigation bar in accordance with the meaning of the detailed "M" = locally modified"U" = Updated in Repository"A" = locally added"D" = locally deleted"I" = ignored"R" = replaced in the repository"–" "=" the contents of the folder have mixed status; Display the contents to individual status"?" = not under source control ' A ' added' D ' Delete' M ' modified' R ' instead' C ' conflict' I ' ignores'?' Not under control'!' Is lost, ty

Special variables in the shell $ $ $# $$ $! $? meaning __shell Script

$: The name of the executing script $* and $@: Return all parameters to $#: The number of arguments $_: represents the last parameter of the previous command $$: The PID $! that represents the command that was last executed: The PID $?: A flag that represents the success of the previous command, or $ if the execution succeeds? is 0, otherwise not 0. Write a script test [wang@localhost desktop]$ vim test1.sh #!/bin/sh echo number:$# "echo" Name:$0 "echo" first:$1 "echo" Secon D:$2 "echo" argure1

Analyzing the existence meaning and existence form of friendship link

). Change links seems to be the focus of attention to the weight of the PR and the site included, snapshots and so on. But Jianghai also found that many times the friendship link is purely a social relationship of the present. The exchange of resources in the virtual society is a cross link, more substantial than the exchange of resources, you add what QQ group? What kind of forum do you play? What kind of microblogging do you play? You are a link to change or do cross connection. The author i

Restatement of the long tail keyword meaning and its practice

Long tail keyword in the current SEO field has been widely used, now the SEO practitioners also like to use the long tail keyword to optimize the site, compared to the general keywords, it is more specific, more in line with the user's experience needs. Long tail keywords in the development process of SEO keyword selection rules of a specific image of the present. So it is very important and necessary to analyze and understand the meaning and practice

The deep meaning of the text of the anchor inside the station and the text of the anchor outside the station

The optimization of the anchor text and the external anchor text of the station is always the topic that many stationmaster cares about, but to do well in these two ways of the anchor text optimization is not simple, first station anchor text and station outside the anchor text optimization involves the optimization of key words optimization, followed by the anchor text and station outside the anchor text optimization also involves the user experience, These two key indicators on the decision of

The meaning of each code of the Executssql function

SELECT statement Cnn. Execute Sql msgstring = Stokens (0) "Query Successful" Else Set rst = New ADODB. Instantiation of the Recordset ' temp list Rst. Open trim$ (SQL), CNN, adOpenKeyset, adLockOptimistic ' rst opening,trim () is the action string to be held; CNN is a string expression, the name of the ODBC data source that is logged in, open in a way 。 ; Dopenkeyset, determines the type of cursor (that is, how to find) to use keyset cursors. You cannot access records deleted by anot

Oracle Tnsnames.ora parameter meaning

Today in the local configuration of the Oracle client, once again need to link the service side of the LAN machine, the estimated need to configure the tnsnames.ora file, make a record, prevent the next use, once again search configuration method: The following is a configured personal tnsnames.ora file content: # Tnsnames.ora Network Configuration file:f:\oracle\product\10.2.0\client_1\network\admin\tnsnames.ora# Generated by Oracle configuration Tools. MES = ( DESCRIPTION = ( address_li

Meaning of "MSSQL" MDF, NDF, LDF file

meaning of "MSSQL" MDF, NDF, LDF file2012-09-03 15:32:56| Category: SQL database | Report | Font size Subscription MDF is the abbreviation of primary data file;NDF is the abbreviation of secondary data files;LDF is the abbreviation for log data files.Not the first letter of the word.There are three types of files in a SQL Server 2000 database:MainThe primary data file contains the startup information for the database and points to other files i

The ENGINE in mysql = InnoDB; What is the meaning?

Label:The storage engine is InnoDB. Nnodb is the first data storage engine on MySQL to provide foreign key constraints, in addition to providing transactional processing, InnoDB also supports row locks, provides consistent, non-lock reads like Oracle, increases the number of concurrent read users and improves performance without increasing the number of locks. InnoDB's design goal is to maximize performance when dealing with large volumes of data , and its CPU utilization is the most efficient o

A little explanation during the installation of SQL Server 2017 (a bit of meaning)

installation files from the following location :https://go.microsoft.com/fwlink/?LinkId=851496lcid=2052https://go.microsoft.com/fwlink/?LinkId=851507lcid=2052https://go.microsoft.com/fwlink/?LinkId=851502lcid=2052https://go.microsoft.com/fwlink/?LinkId=851508lcid=2052Afraid of trouble I directly share the package (Https://pan.baidu.com/s/1kV27fiZ Alternate link : https://pan.baidu.com/s/1hslcwKk password: XMSD)Open you will find also can not download, must change HTTPS to http(estimated site SS

The meaning of MD5 and PGP appearing when Apache was downloaded

The meaning of PGP and MD5 when downloading These two files are just checksums, used to ensure that the Apache files you downloaded are correct and usually not available, If you do not rest assured that you can use the relevant tools to calculate the Apache.msi file MD5 and the MD5 file comparison, the same means that the downloaded file is correct (not in the download process error), PGP is the digital signature of Apache, to ensure that the file is

MySQL execution plan each column meaning

-scanned data).The extra column needs to be aware of the return value:Using Filesort: When you see this, the query needs to be optimized. MySQL requires additional steps to find out how to sort the rows that are returned. It sorts all rows based on the connection type and the row pointers for all rows that store the sort key values and matching criteria. Using Temporary: When you see this, the query needs to be optimized. Here, MySQL needs to create a temporary table to store the results, which

PHP Basics: Database meaning and basic operations additions and deletions

add is a row, delete is also a row,Format: Delete from table name where qualification, such as delete from blog where uid=1;Be sure to add the where condition, without the Where condition will delete the data.Select queryFormat: Select column 1, column 2, column 3 where qualification1. Query all rows of the table for all columns select * from blog; In development, try not to write as much as the data in the table, so that the query will add to the burden of the server, need a few data, just a f

The meaning and function of the conceptual paradigm of database system

ParadigmElimination of dependencies on the master code subset on a 3NF basisSuppose the Warehouse Management Relationship table is storehousemanage (warehouse ID, store item ID, Administrator ID, number), and an administrator works only in one warehouse, and a warehouse can store multiple items. The following decision relationships exist in this database table:( Warehouse ID, store item ID) → ( administrator id, quantity)( Admin ID, store item ID) → ( warehouse ID, quantity)So it came up:(wareh

Object-Oriented Programming (2) meaning of self, destructor, database class practice

=pymysql.cursors.dictcursoR) #这样返回的就是字典def ex_sql (Self,sql):TrySelf.cur.execute (SQL)Except Exception as E:Print (' SQL statement problematic,%s '%sql)ElseSelf.res = Self.cur. Fetchall ()Return Self.res###Destructors Def __del__ (): Pass Executed when the instance is destroyed.######my = MyDb (' 118.24.3.40 ', ' jxz ', ' 123456 ', ' jxz ')My.ex_sql (' select * from Stu; ')Print (My.res)Print (' I'm the last line of code ...') #这里才会执行析构函数. The destructor is executed when the instance

Using command crs_stat-t in Oracle, the meaning of the resource name suffix in the output result

. The GSD coordinates with the cluster Manager-to-receive requests from clients such as the DBCA, EM, and the SRVCTL utility To execute administrative job tasks such as instance startup or shutdown. The GSD is not a Oracle instance background process and is therefore no started with the Oracle instance.. ONS, which refers to the release and subscription services of the ONS (Oracle Notification service), the Fast application notification (fan:fast application Notification) event for communication

MySQL section common type length meaning

Label: int: An int type of 4 bytes in SQL with a length of 1 represents the length of an int type Symbol-Differentiated range: 2147483647~-2147483648 VARCHAR: A varchar type can contain a number, letter, kanji, such as a field of length 15 can hold 15 characters, numbers, letters Tinytext: The default length is 255, numbers, letters, Chinese characters are all one length All of these are pro-measured data, tested only a few, there are other types after the repair, the code is UT

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