New Step by Step Map For 分页查询适配

(three) Alternate Compaction: When 1 ObServer is going to compact 1 partition, queries around the merged partition will probably be despatched to ObServers in other Zones storing replicas of exactly the same partition.

OceanBase adopts MVCC to accomplish concurrency control. Should the Procedure involves one partition or various partitions on solitary server node, it'll browse the snapshot of that server node. Should the operation will involve partitions on numerous server nodes, it executes dispersed snapshot go through.

          Makes a brand new DDL item that can have statements to conduct steps associated with the provided item.

OceanBase supports international essential to constrain knowledge consistency, which is a crucial benefit when compared with all kinds of other dispersed DBMS. Overseas key reference is outlined when creating new desk schema.

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OceanBase supports common SQL question interface, although you can find slight SQLShift vs DBCat distinctions in OceanBase implementation.

OceanBase supports equally vertical and horizontal parallelism, which improves throughput and cuts down latency.

The temporary table comprising The brand new clustered index is renamed with the name of the first desk, and the original desk is dropped with the databases.

For index selection, as OceanBase splits table into partitions, it supports local indexing for regional 金融行业SQL方言转换方案 partitions and world-wide indexing for global partitions.

The LOCK clause may be useful for functions which can be executed set up and is useful for wonderful-tuning the degree of concurrent entry to the table in the course of functions.

OceanBase implements code generator to translate the rational execution DDL迁移/转换 system into reentrant physical execution approach. Work carried out by code generator incorporates translating the sensible operators into Bodily operators, changing the infix expression into suffix expression, leveraging the syntactic facts to create logical information, doing away with the redundant facts construction, etc. OceanBase caches these ideas to prevent re-compiling them in future.

MySQL checks the row dimension when the moment algorithm adds a column, and throws the subsequent mistake When the addition exceeds the limit.

If you do not know the names with the international critical constraints on a selected desk, challenge the subsequent assertion and find the constraint identify during the CONSTRAINT clause for every international critical:

OceanBase implements block cache for Micro Block to speed up major scan question. In addition it implements a row cache for rows in block cache to accelerate modest get question.