MySQL common functions

MySQL munera communia

2024-07-12

Ut late usus systematis database relationis procuratio, MySQL locupletem praebet functionality ad varias applicationes sustinendas. Nonnulla functiones communes MySQL sunt hae:

Database procuratio

1. crea et administrare databases ac mensas;

MySQL flexibiles SQL propositiones praebet ut databases ac mensas suas creandi, modificandi et delendi.

CREATE DATABASE mydatabase;
CREATE TABLE mytable (id INT PRIMARY KEY, name VARCHAR(50));
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2. Data insertio, renovatio et deletio;

Vexillum SQL utere declarationibus pro notitia manipulation.

INSERT INTO mytable (id, name) VALUES (1, 'Alice');
UPDATE mytable SET name = 'Bob' WHERE id = 1;
DELETE FROM mytable WHERE id = 1;
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3. Query data:

Data retrieval per sententias selectas, inter iuncturas implicatas, subquerias, voluptua, et copulationes.

SELECT * FROM mytable WHERE name = 'Alice';
SELECT name, COUNT(*) FROM mytable GROUP BY name;
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Securitas et permissiones

1. User administratione ac permissione imperium;

MySQL permissionem moderationis subtiliorem praebet, administratores permittens diversas licentias diversis utentibus assignare.

CREATE USER 'user1'@'localhost' IDENTIFIED BY 'password';
GRANT SELECT, INSERT ON mydatabase.* TO 'user1'@'localhost';
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2. Munus procuratio;

Incipiens a MySQL 8.0, munus administrandi sustinetur, permissio assignationis et administrationis simplificans.

CREATE ROLE 'developer';
GRANT SELECT, INSERT, UPDATE ON mydatabase.* TO 'developer';
GRANT 'developer' TO 'user1'@'localhost';
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Euismod ipsum

1. Index:

MySQL indicem genera multiplicium sustinet, ut index B-Arbor, index plenus-textus et index localis, ad emendandas interrogationes perficiendas.

CREATE INDEX idx_name ON mytable(name);
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2. Query cache:

MySQL quaero munus cachingum praebet, quod proventus investigationis efficere potest et efficientiam eiusdem interrogationis exsecutionem emendare (in MySQL 8.0 remotum).

3. euismod schema:

Tabularum et instrumentorum copia monitori ac analysi datorum perficiendis praebetur.

SELECT * FROM performance_schema.events_statements_summary_by_digest;
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Replicatio et promptitudinis

1. Magistri ancillae replicatio;

MySQL sustinet replicationem domini-servi pro notitia distributionis et promptitudinis.

CHANGE MASTER TO MASTER_HOST='master_host', MASTER_USER='replication_user', MASTER_PASSWORD='password';
START SLAVE;
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2. Botrus (MySQL InnoDB Cluster);

Praebere summus disponibilitate database botri solutiones curare alta disponibilitate et constantia data.

Data tergum et recuperatio

1. Logica tergum:

usus mysqldump Instrumenta logica tergum.

mysqldump -u root -p mydatabase > mydatabase.sql
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2. Physica tergum:

usus mysqlbackup(MySQL Enterprise Tergum) or xtrabackup(Percona XtraBackup) ad corporis tergum.

Aliae notae provectae

1. Trigger:

SQL signum, quod automatice facit, cum certae eventus (ut INSERT, UPDATE, DELETE) in certa tabula occurrunt.

CREATE TRIGGER mytrigger BEFORE INSERT ON mytable FOR EACH ROW SET NEW.name = UPPER(NEW.name);
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2. Repositorum processuum et functionum;

Statutum SQL declarationum encapsulare, ut pluries dici possint ad meliorem codicem reusability et conservabilitas.

CREATE PROCEDURE myprocedure(IN param1 INT)
BEGIN
  SELECT * FROM mytable WHERE id = param1;
END;
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3. Visum:

Facere mensas virtuales pro quaestionibus implicatis ut emendare interrogationem readability et reusability.

CREATE VIEW myview AS SELECT name FROM mytable WHERE id > 10;
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Per has functiones MySQL instrumentum validum praebet ad necessitates variarum missionum applicandorum occurrentium.

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