VTGate is a lightweight proxy server that sits between your application and your shards, which contain your data. VTGates are essentially stateless and in many cases, you can scale with query load by adding more VTGate instances. Some of the main functions
...moreA VTTablet is the Vitess component that both front-ends and, optionally, controls a running MySQL server. It accepts queries over gRPC and translates the queries back to MySQL, as well as speaking to MySQL to issue commands to control replication, take
...moreVTCtld is a Vitess server component that can perform various Vitess cluster- and component-level operations on behalf of an administrative user. You can interact with VTCtld via a web UI, or via an gRPC interface using the vtctldclient CLI tool. It has an
...moreA keyspace is a logical database. Typically, a keyspace maps to multiple MySQL instances regardless of sharding. This is because it is recommended to run multiple replicas even for an unsharded keyspace. In other words, a keyspace appears as a single
...moreThis is a Vitess CLI used to execute gRPC commands against VTCtld. It is the most common way to perform administrative commands against a running Vitess cluster.
...moreA cell is a group of servers and associated network infrastructure co-located in an area, and isolated from failures in other cells. It is typically either a full data center or a subset of a data center, sometimes called a zone or availability zone.
...moreA tablet is a combination of a mysqld process and a corresponding VTTablet process, usually running on the same machine. Each tablet is assigned a tablet type, which specifies what role it currently performs. The main tablet types are listed below:
...moreA shard is a physical division within a keyspace; i.e. how data is split across multiple MySQL instances. A shard typically consists of one MySQL primary and one or more MySQL replicas.
Each MySQL instance within a shard has the same data, if the effect of
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