Oracle迁移MySQL No Further a Mystery
Receives a copy of this DDL object with each of the statements prompted as appropriate for the command line Resource of your indigenous database.Following compaction the merged Zone warms the cache. When being forced to merge information throughout peak time period, OceanBase adopts this algorithm. This algorithm is orthogonal to small compaction and significant compaction and should be employed together with one of them.
Produces a different DDL object that will incorporate statements to conduct actions associated with the offered item.
OceanBase adopts shared-absolutely nothing program architecture. It merchants replica of each partition on at the very least three server nodes in various server clusters. Every single server node has its very own SQL execution motor and storage engine. The storage engine only accesses the neighborhood knowledge on that node. The SQL motor accesses the worldwide schema and generates the dispersed question approach. Question executors pay a visit to the storage motor of each and every node to distribute and Get details among the them to execute the question.
In 2013, Alipay made a decision to cease utilizing Oracle. Since the alternative option MySQL are unable to assure solid consistency in between active server and standby server, OceanBase got its very first chance. From then on, OceanBase just isn't open sourced any longer.
During the small peak interval during the night or in the event the measurement of MemTable reaches the threshold, OceanBase will merge the MemTable into SSTable(static data in disk) employing one of pursuing merge algorithms:
For each database occasion, it sets a person server node as Energetic root server to offer root company like monitoring the overall health of each of the participant nodes. The foundation assistance is liable for load harmony, details consistency, mistake recovery, etcetera. If this active root server shuts down, OceanBase automatically encourages 1 standby root server DDL迁移/转换 to a whole new Energetic root server.
OceanBase implements code generator to translate the sensible execution program into reentrant physical execution program. Function finished by code generator consists of translating the logical operators into Actual physical operators, changing the infix expression into suffix expression, leveraging the syntactic information to make sensible information, getting rid of the redundant facts composition, and many others. OceanBase caches these 跨平台数据库对象迁移 ideas to stop re-compiling them in upcoming.
(one) Major Compaction: Go through all the static information from disk, merge it While using the dynamic knowledge and afterwards publish again to disk as new static information. That is the most costly algorithm and is typically employed after DDL Procedure.
OceanBase adopts shared-nothing technique architecture. It stores duplicate of every partition on not less than a few server nodes in various server clusters. Just about every server node has its individual SQL execution engine and storage motor. The storage motor only accesses the area details on that node. The SQL motor accesses the worldwide schema and generates the distributed query program. Query executors pay a visit to the storage engine of every node to distribute and Obtain information between them to execute the query.
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(one) Key Compaction: Go through the many static information from disk, merge it Using the dynamic knowledge then write again to disk as new static details. This can be the costliest algorithm and is typically employed after DDL Procedure.
OceanBase also supports secondary index. It combines index keys and table Principal crucial for secondary index.