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Shard (database architecture)

Shard (database architecture)
Some data within a database remains present in all shards,[notes 1] but some only appears in a single shard. Each shard (or server) acts as the single source for this subset of data.[1] A heavier reliance on the interconnect between servers[citation needed]Increased latency when querying, especially where more than one shard must be searched.[citation needed]Data or indexes are often only sharded one way, so that some searches are optimal, and others are slow or impossible.[clarification needed]Issues of consistency and durability due to the more complex failure modes of a set of servers, which often result in systems making no guarantees about cross-shard consistency or durability. In practice, sharding is complex. Where distributed computing is used to separate load between multiple servers (either for performance or reliability reasons), a shard approach may also be useful. Splitting shards across multiple isolated instances requires more than simple horizontal partitioning. dbShards

Use zabbix proxies Otras mejoras Major issues Database Ver hardware Generic OS performance tools Innotop - a real-time, advanced investigation tool for MySQL GUI monitoring tools for MySQL are not always suitable for all our needs or situations. Most of them are designed to provide historical views into what happens to our database over time rather then real-time insight into current MySQL server status. Excellent free tools for this include Cacti, Zabbix, Ganglia, Nagios, etc. But each of them needs to be properly configured to provide details on what is going on in our MySQL instances. And setting up one of these monitoring solutions is neither quick nor trivial (well, maybe with the exception of Ganglia). MySQL Workbench provides a substitute for real-time MySQL status views, though it is very limited. The fact is that you won’t find many text-mode tools of this kind for MySQL. Innotop can be really handy when you need a quick and easy tool that can provide a lot of details on what MySQL is doing – without using difficult queries to get those details manually. But Innotop is even more then that! Configuration Next step: [RO] Dashboard (?

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