The best Side of 跨平台DDL转换

The storage info framework of OceanBase is built according to LSM-Tree, which is analogous towards the method of LevelDB. The data modification is very first recorded in MemTable (dynamic information in memory) working with connected listing, and the head is linked to the corresponding block in block cache.

(3) Alternate Compaction: When a single ObServer is about to compact a person partition, queries over the merged partition will likely be despatched to ObServers in other Zones storing replicas of precisely the same partition.

OceanBase also supports secondary index. It combines index keys and table Most important crucial for secondary index.

OceanBase adopts MVCC to perform concurrency Management. In the event the operation includes one partition or numerous partitions on one server node, it's going to read the snapshot of that server node. Should the operation consists of partitions on multiple server nodes, it executes dispersed snapshot read.

The online DDL attribute offers aid for fast As well as in-location table alterations and concurrent DML. Benefits of this function consist of:

(three) Alternate Compaction: When a single ObServer is going to compact just SQLShift vs OMS one partition, queries within the merged partition will be despatched to ObServers in other Zones storing replicas of the identical partition.

OceanBase supports equally vertical and horizontal parallelism, which will increase throughput and decreases latency.

To paraphrase, a new partitioned desk is made Using the new partitioning plan. The freshly established desk involves any changes utilized because of the ALTER Desk statement, using表达式优化 and table info is copied into the new table construction.

For index selection, as OceanBase splits table into partitions, it supports area indexing for community partitions and world indexing for world wide partitions.

OceanBase works by using physiological logging to documents the many modification. Physiological targets on the modification on Every single solitary page devoid of specifying the in-depth knowledge Corporation in the site. OceanBase uses Paxos consensus algorithm to synchronize log replicas on diverse server nodes.

In case you produce a desk without having a primary vital, InnoDB chooses a single for you, which may be the main Exclusive essential described on NOT NULL columns, or possibly a process-generated critical.

Rebuilds 存储过程迁移/转换 the desk in position. Info is reorganized significantly, making it a pricey Procedure. ALGORITHM=INPLACE just isn't permitted beneath certain circumstances if columns must be transformed to NOT NULL.

Operate: A Dify plugin for connecting to and querying OceanBase databases. This venture has been migrated to a brand new repository.

OceanBase also supports secondary index. It combines index keys and table primary key for secondary index.