During horizontal resharding (splitting or merging shards), there can be shards with overlapping key ranges. For example, the source shard of a split may serve c0-d0 while its destination shards serve c0-c8 the keyspace graph maintains a list (called a partitioning or just a partition) of shards whose ranges cover all possible keyspace ID values, while being non-overlapping and contiguous. Shards can be implementation in several ways: 39 Vanilla MySQL Vitess Every MySQL connection has a memory overhead that ranges between 256KB and almost 3MB, depending on which MySQL release you’re using. As your user base grows

During horizontal resharding (splitting or merging shards), there can be shards with overlapping key ranges. For example, the source shard of a split may serve c0-d0 while its destination shards serve c0-c8 the keyspace graph maintains a list (called a partitioning or just a partition) of shards whose ranges cover all possible keyspace ID values, while being non-overlapping and contiguous. Shards can be implementation in several ways: Vanilla MySQL Vitess Every MySQL connection has a memory overhead that ranges between 256KB and almost 3MB, depending on which MySQL release you’re using. As your user base grows

During horizontal resharding (splitting or merging shards), there can be shards with overlapping key ranges. For example, the source shard of a split may serve c0-d0 while its destination shards serve c0-c8 the keyspace graph maintains a list (called a partitioning or just a partition) of shards whose ranges cover all possible keyspace ID values, while being non-overlapping and contiguous. Shards can be implementation in several ways: Vanilla MySQL Vitess Every MySQL connection has a memory overhead that ranges between 256KB and almost 3MB, depending on which MySQL release you’re using. As your user base grows

implementation in several ways: Vanilla MySQL Vitess Every MySQL connection has a memory overhead that ranges between 256KB and almost 3MB, depending on which MySQL release you’re using. As your user base grows directed to one or more shards in the application’s “product” keyspace. 68 Key Ranges and Partitions Vitess uses key ranges to determine which shards should handle any particular query. • A key range is than the start value and strictly less than the end value. • A partition represents a set of key ranges that covers the entire space. When building the serving graph for a sharded keyspace, Vitess ensures

which are active have a key range specified for that shard. The ones which are not active have no key ranges set. Also the primary can contain a query_service_disabled attribute which is set to false during The replica partition has the following changes: • Two more shard_references for -80 and 80- • Key ranges are specified for these shards • The key range for shard 0 has been removed • query_service_disabled shards -80 and 80- • In the primary partition the shards -80 and 80- are added with associated key ranges • In the primary partition the key range for shard 0 are removed • The replica partition is the same

implementation in several ways: Vanilla MySQL Vitess Every MySQL connection has a memory overhead that ranges between 256KB and almost 3MB, depending on which MySQL release you’re using. As your user base grows +----------+ • SHOW vitess_tablets – Information about the current Vitess tablets such as the keyspace, key ranges, tablet type, hostname, and status. Example Output: +-------+----------+-------+------------+-- be directed to one or more shards in the application’s “product” keyspace. Key Ranges and Partitions Vitess uses key ranges to determine which shards should handle any particular query. • A key range is

implementation in several ways: Vanilla MySQL Vitess Every MySQL connection has a memory overhead that ranges between 256KB and almost 3MB, depending on which MySQL release you’re using. As your user base grows available. • SHOW vitess_tablets – Information about the current Vitess tablets such as the keyspace, key ranges, tablet type, hostname, and status. • SHOW vitess_shards – A list of shards that are available. directed to one or more shards in the application’s “product” keyspace. 99 Key Ranges and Partitions Vitess uses key ranges to determine which shards should handle any particular query. • A key range is

implementation in several ways: 93 Vanilla MySQL Vitess Every MySQL connection has a memory overhead that ranges between 256KB and almost 3MB, depending on which MySQL release you’re using. As your user base grows available. • SHOW vitess_tablets – Information about the current Vitess tablets such as the keyspace, key ranges, tablet type, hostname, and status. • SHOW vitess_shards – A list of shards that are available. directed to one or more shards in the application’s “product” keyspace. 109 Key Ranges and Partitions Vitess uses key ranges to determine which shards should handle any particular query. • A key range is