Efficient way to delete keys by pattern

I’m working on a big project and in some places, I have to delete keys by a pattern, for example, I want to delete all the keys that start with filterProducts

I made a Google search and found some methods to do so like, for example, the method in this article

But I don’t know what is the efficient one for a big project, could you please help me?

• Version: 2.8.0
• Platform: Linux Mint 18.2(Built on Ubuntu 16.04)

[MohammedAl-Mahdawi]

For anyone that looking for the final result that we until now reached to and believe it is the most efficient way is the following:

//key example "prefix*"
function getKeysByPattern(key) {
    return new Promise((resolve, reject) => {
        var stream = redis.scanStream({
            // only returns keys following the pattern of "key"
            match: key,
            // returns approximately 100 elements per call
            count: 100
        });

        var keys = [];
        stream.on('data', function (resultKeys) {
            // `resultKeys` is an array of strings representing key names
            for (var i = 0; i < resultKeys.length; i++) {
                keys.push(resultKeys[i]);
            }
        });
        stream.on('end', function () {
            resolve(keys)
        });
    })
}

//key example "prefix*"
function deleteKeysByPattern(key) {
    var stream = redis.scanStream({
        // only returns keys following the pattern of "key"
        match: key,
        // returns approximately 100 elements per call
        count: 100
    });

    var keys = [];
    stream.on('data', function (resultKeys) {
        // `resultKeys` is an array of strings representing key names
        for (var i = 0; i < resultKeys.length; i++) {
            keys.push(resultKeys[i]);
        }
    });
    stream.on('end', function () {
        redis.unlink(keys)
    });
}

//key example "prefix*"
function batchDeletionKeysByPattern(key) {
    var stream = redis.scanStream({
        // only returns keys following the pattern of "key"
        match: key,
        // returns approximately 100 elements per call
        count: 100
    });

    stream.on('data', function (resultKeys) {
        if (resultKeys.length) {
            redis.unlink(resultKeys);
        }
    });
}

The code above is for ioredis. Please if you are someone that knows a better way of doing so please don’t hesitate to share.

[MohammedAl-Mahdawi]

@dirkbonhomme Thank you so much for your help, I really appreciate that.

I followed your advice and used ioredis and created the following functions, could you please just tell me for big projects is the following the most efficient way for doing so or not:

//key example "prefix*"
function getKeysByPattern(key) {
    return new Promise((resolve, reject) => {
        var stream = redis.scanStream({
            // only returns keys following the pattern of "key"
            match: key,
            // returns approximately 100 elements per call
            count: 100
        });

        var keys = [];
        stream.on('data', function (resultKeys) {
            // `resultKeys` is an array of strings representing key names
            for (var i = 0; i < resultKeys.length; i++) {
                keys.push(resultKeys[i]);
            }
        });
        stream.on('end', function () {
            resolve(keys)
        });
    })
}

//key example "prefix*"
function deleteKeysByPattern(key) {
    var stream = redis.scanStream({
        // only returns keys following the pattern of "key"
        match: key,
        // returns approximately 100 elements per call
        count: 100
    });

    var keys = [];
    stream.on('data', function (resultKeys) {
        // `resultKeys` is an array of strings representing key names
        for (var i = 0; i < resultKeys.length; i++) {
            keys.push(resultKeys[i]);
        }
    });
    stream.on('end', function () {
        redis.unlink(keys)
    });
}