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Let us understand about ‘mysqld’, the MySQL server −mysqldThe mysqld is also known as MySQL Server. It is a single multithreaded program that does most of the work in a MySQL installation. It doesn’t spawn additional processes.MySQL Server helps manage the access to the MySQL data directory which contains databases and tables. The data directory is the default location for other information like log files and status files.Note − Certain installation packages may contain a debugging version of the server by the name mysqld-debug.This version can be invoked instead of the mysqld for debugging support, memory allocation checking, as well ... Read More
There are 4 MySQL server and server-start up programs. They have been listed below −mysqldmysqld_safemysql.servermysqld_multimysqldis also known as MySQL Server. It is a single multithreaded program that does most of the work in a MySQL installation. It doesn’t spawn additional processes. MySQL Server helps manage the access to the MySQL data directory which contains databases and tables. The data directory is the default location for other information like log files and status files.When MySQL server starts, it listens to the network connections from client programs and helps manage the access to databases on behalf of these clients.To see options specified ... Read More
Let us understand how to get the MySQL path in the command prompt −To invoke MySQL programs easily, the path name of the MySQL bin directory can be added to the Windows system PATH environment variable.This can be done using the below mentioned steps −Before trying to add MySQL to Windows path, ensure that MySQL has been installed properly.Add MySQL to PathBelow are the steps to add MySQL to path −Step1 − Locate the mysql.exe file. We found in the following location −C:\Program Files\MySQL\MySQL Server 8.0\binStep 2 − Press Start and type “Environment Variables”. Click −Step 3 − Under ‘Advanced’, ... Read More
Environment variables can be set at the command prompt. This is done to affect the current invocation of the command processor, or to permanently set to affect the future invocations. To set a variable permanently, it can be set in a startup file or with the help of the interface provided by the system for the same purpose. The documentation of the command interpreter needs to be consulted for specific details.To specify a value for an environment variable, the syntax relevant for the command processor needs to be used.The command to set environment variables can be executed at the command ... Read More
Let us understand how to set environment variables on Linux for MySQL −Environment variables can be set at the command prompt. This is done to affect the current invocation of the command processor, or to permanently set to affect the future invocations.To set a variable permanently, it can be set in a startup file or with the help of the interface provided by the system for the same purpose. The documentation of the command interpreter needs to be consulted for specific details. To specify a value for an environment variable, the syntax relevant for the command processor needs to be ... Read More
Before a compressed table is created, ensure that the innodb_file_per_table configuration option is enabled, and innodb_file_format is set to Barracuda. These parameters can be found in the MySQL configuration file my.cnf or my.ini, or with the SET statement without having to shut down the MySQL server.To enable compression for a table, the clauses ROW_FORMAT=COMPRESSED, KEY_BLOCK_SIZE, or both can be used in a CREATE TABLE or ALTER TABLE statement.Let us see the statements to create a compressed table −QuerySET GLOBAL innodb_file_per_table=1; SET GLOBAL innodb_file_format=Barracuda; CREATE TABLE t1 (c1 INT PRIMARY KEY) ROW_FORMAT=COMPRESSED KEY_BLOCK_SIZE=8;Here, If ROW_FORMAT=COMPRESSED is specified, the KEY_BLOCK_SIZE can be ... Read More
The new features in MySQL 8.0 have been briefly listed below −Transactional Data DictionaryA transactional data dictionary to store information about object.Atomic Data Definition LanguageAn atomic data definition language (DDL) statement to combine updates made to data dictionary, storage engine operations and so on.Security EnhancedThe security levels have been improved, and DBA (Database administrator) has been given greater flexibility for account management.EncryptionThe encryption defaults have been defined and implemented globally for table encryption. The ‘default_table_encryption’ variable is used to define an encryption default for schemas that have been newly created. The default encryption for a schema can be defined with ... Read More
The compression operation is used only if both client and server support ‘zlib’ compression, and the client requests compression.Usage of mysqldumpThe advantage of using compression is that it reduces the size of the payloadOn the other hand, the disadvantage of using compression is that it increases the computation time.Performance benefits will depend largely on the size of the result set which is being sent.In addition to this, the network bandwidth and latency between the database server and its clients also matters. The larger the result set, the larger will be the latency.In other words, the lesser the bandwidth, the more ... Read More
ProblemHow to print the long lines into two or more short lines based on specified length in the program using C Language?SolutionLet’s write a code to read a long line and print into two or more short lines according to the mentioned size in the program.The built in functions that we take in this program readline() function, is used to store text in array and returns the size of line.The logic we use to read a short sentence is explained below −while((charcter=readtext())>0){ if(charcter>length){ count=0; a=0; while(alength){ count=0; a=0; while(a
Here, we will learn how to detect and track the motion of eyeball in OpenCV.The following program demonstrates to detect the eyeball and track the location.Example#include #include #include #include #include #include using namespace cv; using namespace std; Vec3f eyeBallDetection(Mat& eye, vector& circles) { vectorsums(circles.size(), 0); for (int y = 0; y < eye.rows; y++) { uchar* data = eye.ptr(y); for (int x = 0; x < eye.cols; x++) { int pixel_value = static_cast(*data); for (int i = 0; i < circles.size(); i++) { ... Read More