Host cache

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Host cache. MySQL now provides more information about the causes of errors that occur when
clients connect to the server, as well as improved access to the host cache, which contains client IP
address and host name information and is used to avoid DNS lookups. These changes have been
• New Connection_errors_xxx [601] status variables provide information about connection
errors that do not apply to specific client IP addresses.
• Counters have been added to the host cache to track errors that do apply to specific IP addresses,
and a new host_cache Performance Schema table exposes the contents of the host cache
so that it can be examined using SELECT statements. Access to host cache contents makes
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