Redis整理(1)之database/key操作

$redis->SELECT(0); //数据库为数字下标
$redis->FLUSHALL();//清空所有数据库的key
$redis->flushdb();  # 删除当前数据库所有key
$redis->RENAME('message','greeting');//改变键的名称
$redis->exists('fake_key');//判断key是否存在
$redis->del('fake_key'); //删除key
$redis->MOVE('song',1);  // 将song移动到数据库1

//查看多个key
//可以进行通配查找
glob风格通配查找
? 一个字符
*  0或多个字符
[] 区间
\x 特殊字符
var_dump($redis->keys('t??')); //array(1) { [0]=> string(3) "two" }
var_dump($redis->keys('t[w]*')); //array(1) { [0]=> string(3) "two" }
print_r($redis->keys('*')); //Array ( [0] => four [1] => three [2] => two [3] => one )

As an AI language model, I do not have access to your system logs or configurations to give you a specific solution. However, here are some general troubleshooting steps that you can try to fix the issue of Redis persistent key-value database failing to start: 1. Check if Redis is already running: Run the following command in the terminal to check if Redis is already running: ``` sudo systemctl status redis ``` If Redis is already running, stop it using the following command: ``` sudo systemctl stop redis ``` 2. Check Redis logs: Run the following command to check the Redis logs: ``` tail -f /var/log/redis/redis-server.log ``` This will show the latest logs from Redis. Look for any error messages or warnings that can help you identify the issue. 3. Check Redis configuration: Check the Redis configuration file (/etc/redis/redis.conf) and make sure that the following settings are correct: ``` daemonize yes pidfile /var/run/redis/redis-server.pid logfile /var/log/redis/redis-server.log dir /var/lib/redis ``` 4. Check Redis data directory permissions: Make sure that the Redis data directory (/var/lib/redis) has the correct permissions. Run the following command to set the correct permissions: ``` sudo chown -R redis:redis /var/lib/redis ``` 5. Check Redis port: Make sure that Redis is listening on the correct port (default is 6379). You can check this in the Redis configuration file (/etc/redis/redis.conf). 6. Restart Redis: Restart Redis using the following command: ``` sudo systemctl start redis ``` If the issue persists, try reinstalling Redis or contacting Redis support for further assistance.
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