5 Easy Facts About 金融行业SQL方言转换方案 Described

(one) Main Compaction: Go through all the static data from disk, merge it While using the dynamic facts after which write back again to disk as new static facts. This is certainly the most costly algorithm and is usually utilized immediately after DDL Procedure.

general public DDL(DBObject obj) Produces a whole new DDL object which will contain statements to carry out steps regarding the specified object.

The utmost number of columns in the internal representation from the desk cannot exceed 1022 right after column addition with the moment algorithm. The error concept is:

In 2013, Alipay made a decision to halt making use of Oracle. Considering that the choice selection MySQL are not able to make certain potent regularity among Lively server and standby server, OceanBase acquired its very first chance. From then on, OceanBase is not open sourced anymore.

1 when it comes to effectiveness, based on the most up-to-date examination outcomes launched via the Transaction Processing Effectiveness Council (TPC), a all over the world consortium that establishes requirements for database.  

OceanBase employs physiological logging to records each of the modification. Physiological targets over the modification on Every solitary SQL方言转换 site with no specifying the thorough data Group inside the webpage. OceanBase makes use of Paxos consensus algorithm to synchronize log replicas on distinct 数据库国产化迁移 server nodes.

OceanBase supports both equally vertical and horizontal parallelism, which improves throughput and lowers latency.

Within the scene, firefighters battled the hearth which they inevitably received less than Command on the Diamond, EBD intricate.

When an Procedure on the key vital uses ALGORITHM=INPLACE, Regardless that the information is still copied, it is more productive than working with ALGORITHM=COPY due to the fact:

The LOCK clause can be useful for functions which might be done in place and is useful for great-tuning the diploma of concurrent entry to the desk throughout operations.

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When you choose the data in different formats, you modify the presentation of the information for that query, rather than the info by itself.

OceanBase implements code generator to translate the logical execution program into reentrant physical execution prepare. Perform finished by code generator involves translating the rational operators into Bodily operators, converting the infix expression into suffix expression, leveraging the syntactic information and facts to generate logical details, removing the redundant facts construction, etc. OceanBase caches these programs to stay away from re-compiling them in future.

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