(three) Alternate Compaction: When a single ObServer is about to compact one partition, queries over the merged partition are going to be despatched to ObServers in other Zones storing replicas of precisely the same partition.
For index assortment, as OceanBase splits table into partitions, it supports regional indexing for regional partitions and world-wide indexing for international partitions.
OceanBase adopts shared-nothing system architecture. It stores reproduction of each partition on at the very least a few server nodes in various server clusters. Each individual server node has its individual SQL execution engine and storage motor. The storage engine only accesses the neighborhood knowledge on that node. The SQL engine accesses the global schema and generates the distributed question prepare. Question executors visit the storage engine of each node to distribute and Get details amid them to execute the question.
For each databases occasion, it sets a single server node as Lively root server to provide root assistance like monitoring the well being of all of the participant nodes. The root service is to blame for load balance, facts regularity, mistake Restoration, and so forth. If this Energetic root server shuts down, OceanBase instantly promotes one particular standby root server to a different Lively root server.
general public DDL(DBObject obj) Makes a fresh DDL object that will consist of statements to execute actions relating to the offered item.
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of the listing of valid member values could be done immediately or in place, assuming that the storage dimensions of the information type will not modify. Such as, including a member into a Established column that has eight members changes the essential storage for each worth from one byte to 2 bytes; this requires a table duplicate.
In 2013, Alipay chose to halt using Oracle. Given that the choice preference MySQL won't be able to make certain robust consistency concerning Lively server and standby server, OceanBase acquired its to start with chance. From then on, OceanBase is not open sourced any longer.
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From OceanBase two.0, it supports hybrid storage model. Characteristics belong to exactly the same tuple are saved in exactly the same block, nevertheless the tuples in a similar block are SQL方言转换 compressed and saved in columnar design.
When you produce a desk with no Key vital, InnoDB chooses one particular to suit your needs, which may be the very first Distinctive crucial defined on NOT NULL columns, or a program-created key.
MySQL checks the row dimension when the INSTANT algorithm provides a column, and throws the subsequent mistake If your addition exceeds the Restrict.
The INSTANT algorithm can not increase or drop columns to program schema tables, such as The interior mysql table.
For each database occasion, it sets 1 server node as active root server to deliver root provider like checking the health and fitness of every one of the participant nodes. The basis provider is accountable for load balance, knowledge consistency, error recovery, etc. If this Lively root server shuts down, OceanBase automatically promotes just one standby root server to a whole new Energetic root server.