Is there a way to get the bucket size in php using the Memcached client?
Can I get the maximum keys?
Or some forecasting based on current key sizes, how many more the server can handle without starting to miss caches?
Seems like there are a couple different questions here...
You can get the actual size of a bucket by using the getStats call within the PHP library.
As for forecasting/sizing, you can take a look at our sizing guidelines: http://www.couchbase.org/wiki/display/membase/Sizing+Guidelines
This only focuses on Membase buckets currently, memcached buckets are a lot easier to size and is based just on how much data you want the bucket to hold since it's all RAM based and will "evict" data when the RAM is full.
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