Pretty slow while removing one-by-one

[qiangbro]

i have a real time system, i need to add/remove items one-by-one from the db, here's my example:

    let t;

    let alarms = [];
    for (let i = 0; i < 10000; i++) {
        alarms.push({id: i, name: 'hello' + i});
    }

    let db = new loki('exampleDB');
    let alarmCollection = db.addCollection('myAlarms', {indices: ['id']});

    console.log(`开始插入。。。`)
    t = Date.now();
    alarms.forEach(obj => alarmCollection.insert(obj));
    console.log(`完成插入 耗时${(Date.now() - t) / 1000}s alarmCollection.count=${alarmCollection.count()}`);

    console.log('开始删除 size=' + alarms.length)
    t = Date.now();
    alarms.forEach(obj => alarmCollection.findAndRemove({id: obj.id}));
    console.log(`完成删除 耗时${(Date.now() - t) / 1000}s, alarmCollection.count=${alarmCollection.count()}`);

result:

开始插入。。。
完成插入 耗时0.011s alarmCollection.count=10000
开始删除 size=10000
完成删除 耗时2.731s, alarmCollection.count=0

as we can see, it took pretty much time to remove items from the collection one by one.

Any idea to improve the performance for removing one-by-one?

[stale[bot]]

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