Last Updated: Dec 14, 2017

Term Description
Memcached Memcached is a high-performance distributed caching system for memory objects. For the official introduction of Memcached, see here. Alibaba Cloud ApsaraDB for Memcache is compatible with the Memcached binary protocol and text protocol.
Instance ID An instance corresponds to a user space. It is the basic unit for using ApsaraDB for Memcache. ApsaraDB for Memcache imposes different QPS and traffic limits on single instances of different capacity specifications. You can view the instance ID list on the console.
Connection address The host address used to connect to ApsaraDB for Memcache is displayed in the form of domain names. You can query the host address in Instance Information>Basic Information>Instance Details>Intranet Address.
Connection password The password used to connect to ApsaraDB for Memcache. You can set the password during the purchase, or reset the password after the purchase.
Hit rate The successful reads by the user/the reads by the user.
Password-free access It specifies whether or not you can access the corresponding ApsaraDB for Memcache instance on an authorized ECS without a password. For more information, see Password-free Access.
SASL Simple Authentication and Security Layer (SASL) is a mechanism that expands the verification capability of the client/server (C/S) mode. Memcached starts to support SASL authentication from version 1.4.3. Alibaba Cloud ApsaraDB for Memcache also uses SASL as the authentication mechanism because ApsaraDB for Memcache is shared by multiple tenants. Essentially, SASL uses passwords to guarantee security of the cached data. We recommend use a strong password and change the password periodically. ApsaraDB for Memcache performs an authentication once every 60 seconds automatically.
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