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Linux O M Study Notes MySQL backup and recovery (incremental recovery) tutorial, Study Notes mysql Chapter 2 MySQL backup and recovery advanced-incremental recovery I. Under what circumstances do I need incremental database recovery? 1. Do I need incremental recovery if the master database or slave database goes down due to hardware damage? No. The master database goes down. You only need to switch the fas

Linux coredump Study Notes and coredump Study Notes Beginner's notes:In the case of exceptions in linux programs, the process will be down. Most servers will set up to generate core files. In actual operation, I have encountered a process that keeps core and is automatically monitored and pulled up, if a core exists after a period of time, the disk is fully occupied and the service is affected. After learni

[Study Notes] [C Language] array, Study Notes Array1. What is an array? Array, literally, it means a group of data. Yes, arrays are used to store a group of data.2. array features Only one type of data can be stored, such as an array of the int type and an array of the float type. The stored data is called an "element"3. Definition Declare the array type Declare the number of elements in the array (How much

[Study Notes] [C Language] type specifier, Study Notes C Language1. short and long 3. Code 1 # include

My MYSQL Study Notes (1), MYSQL Study Notes ( This is my personal notes for learning MYSQL through online articles. I hope this will help you.1. DEFUALT keywords CREATE TABLE emp(id INT DEFAULT 12) 2. Set the auto-increment column (auto_increment) create table temp2( id INT primary KEY auto_increment, tname INT) The step size cannot be set for the mysql auto-increment column.View the default auto-in

My MYSQL Study Notes (3) -- operators, mysql Study Notes 1. Security equals operator ( Select null Note that the difference between this operator and equal to (=) is that when both values are null, the execution result is as follows: 2. LEAST OperatorPurpose: obtain the minimum value among multiple parameter values.Note: Do not use hybrid Data Types SELECT least (2, 0), LEAST ('A', 'B', 'C', 'D'), lea

Lua Study Notes 11: Tips in lua, lua Study Notes The tips in lua are the special features of the basic lua language. Clever Use or x = x or v It is equivalent: if not x then x = vend If x is nil or false, assign it a value Binary ternary operator implementation a and b or c Similar to C language: a ? b : c The and operation takes precedence over or. Fill in 0 for the third digit str = string

March 31 Study Notes (CSS part), March 31 Study Notes css Background attributes Text attributes The direction attribute affects the writing direction of the text in the block-level element, the direction of the column layout in the table, the direction of the element box filled with content horizontally, and the position of the last row in the alignment element at both ends. Note: For intra-row e

Database Study Notes (3), Database Study Notes Tip: To run a program, you must first add the database to the specified folder, For example, if E: \ DATA is written in the code, you must first create a folder in E: \, and then compile and execute the database code. -- Add studentfgrp file groups to the database, and add studentfile. ndf to studentfgrp.Alter DATABASE studentAdd filegroup studentfgrpGOAlte

Lua Study Notes 14: multiple function return values, and lua Study NotesThe function in Lua can return multiple values. To illustrate the number of returned values in different cases, we first declare the following functions: -- No return value function fun0 () end -- one return value function fun1 () return 1end -- two return values function fun2 () return 1, 2end -- three and multiple return values functi

Golang Study Notes [5] integer and golang Study Notes integer Golang has many integer classes, but generally it is better to use int or uintt, Package mainimport ("fmt" "unsafe") func main () {var i1 int8 = 1 // 1 bytevar i2 int16 = 2 // 2 bytevar i3 = 3 // 4 bytevar i4 int64 = 4 // 8 bytevar i5 int = 5 // 32-bit: 4 64-bit: 8var i6 uint8 = 1 // 1 bytevar i7 uint16 = 2 // 2 bytevar i8 uint32 = 3 // 4 byte

Sqlite Study Notes 10: Using sqlite to query and update data in C language, sqlite Study Notes The third parameter in sqlite_exec () mentioned above, SQLite will call this callback function for each record processed in each SELECT statement executed in the SQL parameter. This section adds two functions: selectFromTable and updateTable. The instance program is as follows: # Include Bool selectFromTable ()

Java Study Notes 30, java Study Notes The sortedlist class is the implementation class of the List interface. It is a List set and allows random access to the collection elements based on the index. In addition, the consumer list is also real The Deque interface can be used as a dual-end queue or a "stack. A chain-based linear table. The following is an official description of the sort list class: ListTh

Sqlite Study Notes 4: Create and Delete tables and sqlite Study Notes If you have done so much, isn't it just to get a few tables for data? Let's take a look at how to create a new table. 1. Create a table The basic syntax is as follows: CREATE TABLE database_name.table_name( column1 datatype PRIMARY KEY(one or more columns), column2 datatype, column3 datatype, ..... columnN datatype,); Specifi

Sqlite Study Notes 2: Create a database and sqlite Study Notes In the last note, an sqlite executable file is generated, and cd is executed under the directory where sqlite is located: Sqlite3 MyDataBase. db A database named MyDataBase. db is created, and a file named MyDataBase. db is generated under the current path. # Remember not to run sqlite3 first, and then the above command, but directly ent

Java study notes 28, java Study Notes Vector is the implementation class of the List interface and supports all functions of the List interface. The Vector class is a List class implemented based on arrays and encapsulates a dynamic, The Object [] array that allows redistribution. The Vector is thread-safe and requires no program to ensure the synchronization of the set. Some methods of the Vector class a

Linux cloud computing cluster Architecture Study Notes: 1-1 rhel7 basic commands, Study Notes rhel7 1-3-RHEL7Basic commands 1.1LinuxTerminal introduction Shell prompt Bash Shell basic syntax. 1.2Use of basic commands: ls, pwd, and cd. 1.3View the system and BIOS hardware time. 1.4LinuxHow to get help, Linux shutdown command: shutdown, init, etc. 1.5Linux 7Startup level, set the server to automatically

[Struts2 Study Notes (5)] processing process and working principle of Struts2, struts2 Study Notes (1) Struts2 processing process (2) processing functions 1. strutsPrepareAndExecuteFilter is the core controller of Struts 2 Framework (after Struts 2.1.3, org. apache. struts2.dispatcher. filterDispatcher has been marked as obsolete). It is used to intercept all user requests specified by 2. When a user's req

[Struts2 Study Notes (2)] the default values in the Action configuration and the forwarding types of results in the Action, struts2 Study NotesI. default values in Action configuration Ii. Various forwarding types of result in Action (1) result configuration is similar to forward in struts1, but struts2 provides multiple result types. Common types include dispatcher (default), redirect, redirectAction,

Html5 Study Notes (1) and html5 Study Notes 1. figure \ figcaption | detail \ summary | mark learning notes Code: 2. progress \ meter The Code is as follows: