Indicators on 跨平台DDL转换 You Should Know

The storage details construction of OceanBase is made depending on LSM-Tree, which is analogous to the technique of LevelDB. The info modification is to start with recorded in MemTable (dynamic information in memory) making use of joined listing, and the head is associated with the corresponding block in block cache.

(1) Big Compaction: Examine all the static info from disk, merge it with the dynamic details after which write back again to disk as new static data. This can be the most costly algorithm and is often utilised immediately after DDL Procedure.

OceanBase also supports secondary index. It brings together index keys and desk Main vital for secondary index.

OceanBase adopts shared-practically nothing process architecture. It suppliers duplicate of every partition on at least 3 server nodes in different server clusters. Just about every server node has its have SQL execution engine and storage motor. The storage engine only accesses the area data on that node. The SQL motor accesses the worldwide schema and generates the dispersed question system. Question executors pay a visit to the storage motor of every node to distribute and Acquire information among the them to execute the query.

No accidents were documented and the business’s personnel was found 存储过程迁移/转换 inside the vicinity of the intricate seeking on.

@RichardSmith hugely respect your comment, clarifying it anyone who reads this response. And following I read through this comment, it seems fairly logical that TRUNCATE is DDL

In 2013, Alipay decided to cease applying Oracle. Because the choice alternative MySQL can't Oracle迁移PostgreSQL assure sturdy consistency among active server and standby server, OceanBase got its initial option. From then on, OceanBase just isn't open sourced anymore.

The short-term desk comprising The brand new clustered index is renamed Together with the identify of the original table, and the initial table is dropped from the database.

OceanBase supports common SQL query interface, even though you'll find slight dissimilarities in OceanBase implementation.

As the desk construction is carefully tied to the main critical, redefining the primary critical even now demands copying the info.

OceanBase also supports secondary index. It combines index keys Oracle转MySQL and table primary vital for secondary index.

Rebuilds the desk in place. Data is reorganized considerably, making it a pricey Procedure. ALGORITHM=INPLACE just isn't permitted beneath specified conditions if columns need to be transformed to NOT NULL.

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

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