The best Side of 跨平台DDL转换
The table stays accessible for go through and create functions though the index is getting produced. The Build INDEX statement only finishes In fact transactions which have been accessing the desk are concluded, so which the initial condition on the index displays the most recent contents from the table.(3) Alternate Compaction: When one particular ObServer is going to compact a person partition, queries within the merged partition will be despatched to ObServers in other Zones storing replicas of the identical partition.
OceanBase utilizes physiological logging to records all the modification. Physiological targets around the modification on Every solitary site with out specifying the comprehensive facts organization inside the page. OceanBase employs Paxos consensus algorithm to synchronize log replicas on diverse server nodes.
OceanBase adopts shared-very little process architecture. It outlets duplicate of each and every partition on no less than three server nodes in numerous server clusters. Just about every server node has its individual SQL execution engine and storage motor. The storage engine only accesses the regional knowledge on that node. The SQL motor accesses the global schema and generates the distributed query program. Question executors check out the storage engine of each and every node to distribute and Acquire details among them to execute the query.
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@RichardSmith extremely enjoy your comment, clarifying it anyone who reads this remedy. And after I read this comment, It appears really logical that TRUNCATE is DDL
OceanBase utilizes column compression. It implements many encoding algorithms and it mechanically chooses the best suited a person for each SQL语法适配 column. It adopts column compression to leverage details similarity, like exact details variety, identical worth selection, etc.
At the scene, firefighters battled the hearth which they at some point got less than Regulate within the Diamond, EBD elaborate.
During the lower peak period during the night or when the sizing of MemTable reaches the edge, OceanBase will merge the MemTable into SSTable(static facts in disk) utilizing one of adhering to merge algorithms:
OceanBase utilizes physiological logging 系统函数适配/兼容 to records the many modification. Physiological targets on the modification on Every single web site without specifying the comprehensive knowledge Group inside the web site. OceanBase makes use of Paxos consensus algorithm to synchronize log replicas on distinctive server nodes.
OceanBase implements code generator to translate the logical execution prepare into reentrant Actual physical execution strategy. Perform completed by code generator consists of translating the reasonable operators into Bodily operators, converting the infix expression into suffix expression, leveraging the syntactic information to produce reasonable information, eliminating the redundant data composition, etc. OceanBase caches these plans to stop re-compiling them in foreseeable future.
OceanBase adopts consistent non-blocking checkpoint mechanism. Their staff is at present working on the development of fuzzy non-blocking checkpoint mechanism executed in LSM tree composition. They want to launch that in following Variation.
OceanBase makes use of column compression. It implements many encoding algorithms and it routinely chooses the most suitable 1 for every column. It adopts column compression to leverage information similarity, including same information type, same price assortment, and many others.
OceanBase supports regular SQL question interface, although you will find slight discrepancies in OceanBase implementation.