红迪斯密钥的变数命名原则和有效字符

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最佳答案

Part of this is answered here, but this isn't completely a duplicate, as you're asking about allowed characters as well as conventions.

As for valid characters in Redis keys, the manual explains this completely:

Redis keys are binary safe, this means that you can use any binary sequence as a key, from a string like "foo" to the content of a JPEG file. The empty string is also a valid key.

A few other rules about keys:

Very long keys are not a good idea, for instance a key of 1024 bytes is a bad idea not only memory-wise, but also because the lookup of the key in the dataset may require several costly key-comparisons. Even when the task at hand is to match the existence of a large value, to resort to hashing it (for example with SHA1) is a better idea, especially from the point of view of memory and bandwidth.

Very short keys are often not a good idea. There is little point in writing "u1000flw" as a key if you can instead write "user:1000:followers". The latter is more readable and the added space is minor compared to the space used by the key object itself and the value object. While short keys will obviously consume a bit less memory, your job is to find the right balance.

Try to stick with a schema. For instance "object-type:id" is a good idea, as in "user:1000". Dots or dashes are often used for multi-word fields, as in "comment:1234:reply.to" or "comment:1234:reply-to".

The maximum allowed key size is 512 MB.