Redis报错解决：RDB: 0 MB of memory used by copy-on-write

我在使用Redis的时候报错如下：

2225:M 06 May 12:01:45.066 * 10 changes in 300 seconds. Saving...
32225:M 06 May 12:01:45.080 * Background saving started by pid 20591
20591:C 06 May 12:01:46.318 * DB saved on disk
20591:C 06 May 12:01:46.327 * RDB: 0 MB of memory used by copy-on-write
32225:M 06 May 12:01:46.399 * Background saving terminated with success

然后因为保持太频繁然后内存不够，程序崩了。

解决方法如下：

# To deactivate RDB dump 取消保存
config set save ""

但如果关闭持久化，服务器关机后，redis的数据会被全部清空。
所以你需要虚拟内存.
Linux下使用虚拟内存的方法可以参考这篇文章：debian 9/ ubuntu 添加swap分区

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