PHP Redis: Get Slow Log (Detailed Guide w/ Code Examples)

Use Case(s)

The slow log is a feature of Redis where it keeps track of your slowest queries. In PHP, if you are using the redis extension, you might want to retrieve this slow log for performance debugging purposes. This can help you identify and optimize expensive queries.

Code Examples

Here's how you can get the slow log in PHP:

$redis = new Redis();
$redis->connect('127.0.0.1', 6379);
$slowlog = $redis->slowlog('get');
print_r($slowlog);

In this example, we first create an instance of Redis and connect to the server running on localhost at port 6379. The 'slowlog' method with the argument 'get' is then used to retrieve the slow log, which gets printed out.

Best Practices

• Do not call slowlog command in your application frequently, it may affect your application performance.

• Ensure to keep a check on the size of your slow log. You should regularly export and clean your slow log to prevent it from occupying too much memory.

Common Mistakes

• Not configuring the slow log. By default, Redis does not log any queries. You need to set the slowlog-log-slower-than option to an appropriate value based on your application needs.

FAQs

Q: How do I configure the slow log in Redis?

A: You can configure the slow log by setting the slowlog-log-slower-than and slowlog-max-len options in your Redis configuration file or dynamically using the CONFIG SET command.