The storage facts framework of OceanBase is developed based on LSM-Tree, which has similarities into the tactic of LevelDB. The info modification is first recorded in MemTable (dynamic information in memory) utilizing connected checklist, and The top is associated with the corresponding block in block cache.
It can be made and optimized for OLTP purposes on relational structured info, even though its shared-nothing framework also supports OLAP apps.
MySQL creates a brand new clustered index by copying the prevailing facts from the original desk to A brief table which includes the specified index framework. Once the information is totally copied to your short term desk, the original table is renamed with a different momentary desk title.
TRUNCATE is DDL not DML. That will not look logical until eventually you prevent and evaluate how it's carried out as well as permissions required. It's fundamentally syntactic shorthand to get a DROP followed by a CREATE using the very same original schema.
general public DDL copyWithPrompts() Gets a replica of this DDL object with every one of the statements prompted as suitable for the command line Resource in the native database.
@TomJMuthirenthi I don't Assume Explain suits into any of The 2. It just returns It can be personal representation of how a Desk/DB is structured. You are able to reach 金融行业SQL方言转换方案 the identical thing with e.g. Produce but not as "human-readable"
SAVEPOINT – a point inside of a transaction that permits rollback condition to what it absolutely was at enough time in the savepoint.
Renaming a desk is usually carried out instantaneously or in place. MySQL renames files that correspond into the table tbl_name
For index variety, as OceanBase splits desk into partitions, it supports neighborhood indexing for area DDL迁移/转换 partitions and global indexing for world wide partitions.
community DDL copyWithPrompts() Gets a copy of the DDL object with every one of the statements prompted as suitable for the command line Software from the native databases.
OceanBase also supports secondary index. It combines index keys and desk Major essential for secondary index.
Non-partitioning online Change Desk operations on partitioned tables Stick to the same procedures that use to normal tables.
Functionality: A Dify plugin for connecting to and querying OceanBase databases. This undertaking has become migrated to a brand new repository.
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