USE INFORMATION_SCHEMA;
SELECT 
CONCAT("ALTER TABLE ", TABLE_SCHEMA ,".", TABLE_NAME, "ENGINE=MEMORY;") 
AS MySQLCMD FROM TABLES 
WHERE TABLE_SCHEMA = "MA_BASE";

Liste tous les champs d’une table dans un tableau PHP

USE INFORMATION_SCHEMA;
SELECT 
CONCAT('$variable["', COLUMN_NAME ,'"]') 
FROM COLUMNS 
WHERE TABLE_SCHEMA = "mabase" AND TABLE_NAME='matable';

après copie du contenu du répertoire mysql d’un serveur vers un autre pour corrigé les évolutions du format

mysql_upgrade --force  -uuser -ppassword

Réplication
slave my.cnf

slave-parallel-threads=4

server-id       = 03
relay-log-index = /home/mysql/mysql_log/slave-relay-bin.index
relay-log       = /home/mysql/mysql_log/slave-relay-bin

replicate-do-db = base1
replicate-do-db = base2
replicate-do-db = base3

replicate-ignore-table  = base1.table_pas_ok
replicate-ignore-table  = base2.table_pa_ok
slave-skip-errors = 1236,1146,1032

master show master status; -> noter file et pos exmaster1-bin.030648, 50302757

slave
STOP SLAVE;

change master to
master_host='hostname',
master_user='user_copy',
master_password='user_pass', 
master_port=3306,
master_log_file='master1-bin.030648',
master_log_pos=50302757,
master_connect_retry=10;

START SLAVE;

SELECT * FROM table1 AS d
LEFT JOIN table2 AS s ON s.REF = BINARY d.REF 

edit /etc/apparmor.d/usr.sbin.mysqld
Ajouter les répertoires contenant les csv pour LOAD
/usr/sbin/mysqld {
    [...]
        /home/www/douane/export/ftp_tempo/ r,
        /home/www/douane/export/ftp_tempo/* rw
	/home/mysql_log r,
	/home/mysql_log/** rwk
    [...]
}

/etc/init.d/apparmor reload


Autre pb selon serveur

/etc/systemd/system/mysqld.service -> ProtectHome=false
systemctl daemon-reload
/etc/init.d/mysql stop
/etc/init.d/mysql start

On peut alors faire
CREATE DATABASE DBF_TABLES CHARACTER SET CP850;
USE DBF_TABLES; 
CREATE TABLE stock engine=CONNECT table_type=DBF READONLY=0 file_name='/home/lecteurh/dbf/fichiers/stock.dbf';
Pour certaines version -> erreur 174
CREATE TABLE stock engine=CONNECT table_type=DBF READONLY=0 
 option_list='Accept=1' file_name='/home/lecteurh/dbf/fichiers/stock.dbf';

création d'au moins un index:
ALTER TABLE `stock` ADD PRIMARY KEY (`id_stock`);
-> fichier stock.dbx créé <- vérifier car pas de message d'erreur si pb de droits