PHP and Memcached database backup and recovery
May 15, 2023 pm 09:12 PM
With the rapid development of the Internet, large-scale MySQL database backup and recovery has become one of the essential skills for major enterprises and websites. With the widespread application of Memcached, how to back up and restore Memcached has also become an important issue. As one of the main languages ??for web development, PHP has unique advantages and skills in handling backup and recovery of MySQL and Memcached. This article will introduce in detail the implementation method of PHP processing MySQL and Memcached backup and recovery.
1. PHP and MySQL backup and recovery
1. Back up MySQL
MySQL backup refers to backing up the data and table structure in the database to the server's disk so that Use when recovery is needed. PHP implements backup by calling the mysqldump command. The mysqldump command writes the backup file to a file on the disk by default, so you need to ensure that PHP has write permission to the directory.
The PHP code for backing up the database is as follows:
<?php
//數(shù)據(jù)庫(kù)連接信息
$username = "root";
$password = "password";
$host = "localhost";
$database = "database_name";
//備份文件名
$filename = "./backup_" . date("Y_m_d_H_i_s") . ".sql";
//執(zhí)行備份命令
$command = "mysqldump --opt -h{$host} -u{$username} -p{$password} {$database}>{$filename}";
exec($command, $output, $return_var);
//判斷備份是否成功
if($return_var == 0){
echo "備份成功！";
}else{
echo "備份失?。?quot;.implode("，", $output);
}
?>2. Restoring MySQL
When the database needs to be restored, PHP can also achieve restoration between different versions by calling the mysql command Database recovery. It should be noted that before performing database recovery, a blank target database needs to be created, otherwise the recovery command cannot be used.
The PHP code to restore the database is as follows:
<?php
//數(shù)據(jù)庫(kù)連接信息
$username = "root";
$password = "password";
$host = "localhost";
$database = "database_name";
//備份文件名
$filename = "./backup_2020_05_10_01_23_45.sql";
//執(zhí)行恢復(fù)命令
$command = "mysql -h{$host} -u{$username} -p{$password} {$database}<{$filename}";
exec($command, $output, $return_var);
//判斷恢復(fù)是否成功
if($return_var == 0){
echo "恢復(fù)成功！";
}else{
echo "恢復(fù)失?。?quot;.implode("，", $output);
}
?>2. Backup and recovery of PHP and Memcached
1. Backup Memcached
Memcached is a high-speed distributed An in-memory object caching system with slightly different backup and recovery techniques than MySQL. When backing up Memcached, the cache data needs to be written to a file and placed on the backup server. Here we first use PHP to connect to the Memcached server, read the cached data and write it to the disk file.
The PHP code for backing up Memcached is as follows:
<?php
//Memcached連接信息
$servers = array(
array("127.0.0.1", 11211, 10),
);
//備份文件名
$filename = "./backup_" . date("Y_m_d_H_i_s") . ".dat";
//連接Memcached
$memcache_obj = new Memcache;
foreach($servers as $server){
$memcache_obj->addServer($server[0], $server[1], true, $server[2]);
}
//獲取所有鍵值對(duì)
$all_items = $memcache_obj->getAllKeys();
$fp = fopen($filename, 'wb');
//把鍵值對(duì)寫(xiě)入文件
foreach($all_items as $item){
$value = $memcache_obj->get($item);
fwrite($fp, $item . " " . $value . "
");
}
fclose($fp);
//輸出備份文件名
echo $filename;
?>2. Restoring Memcached
When we need to restore Memcached, we need to open the backup file and connect to the Memcached server through PHP, Write the key-value pairs in the backup file to Memcached. It should be noted that the Memcached server needs to be cleared before writing.
The PHP code to restore Memcached is as follows:
<?php
//Memcached連接信息
$servers = array(
array("127.0.0.1", 11211, 10),
);
//備份文件名
$filename = "./backup_2020_05_10_01_23_45.dat";
//連接Memcached
$memcache_obj = new Memcache;
foreach($servers as $server){
$memcache_obj->addServer($server[0], $server[1], true, $server[2]);
}
//讀取備份文件中的鍵值對(duì)，并寫(xiě)入Memcached
$fp = fopen($filename, 'rb');
$memcache_obj->flush();
while(!feof($fp)){
$line = fgets($fp);
$arr = explode(" ", $line);
if(count($arr) == 2){
$memcache_obj->set($arr[0], $arr[1], 0, 0);
}
}
fclose($fp);
//輸出恢復(fù)成功信息
echo "恢復(fù)成功！";
?>To sum up, PHP processing MySQL and Memcached backup and recovery is an important skill to achieve data backup and recovery. By calling the mysqldump and mysql commands, MySQL backup and recovery can be achieved; when backing up and restoring Memcached, the key-value pairs need to be read one by one and written to the file. Through the above methods, enterprises and websites can easily backup and restore MySQL and Memcached to ensure data reliability.
The above is the detailed content of PHP and Memcached database backup and recovery. For more information, please follow other related articles on the PHP Chinese website!
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