什么是 LSM 虽然大家都是叫它 LSM 树,听着很像是一个树状的数据结构,但严格意义上,它是一种存储结构,全称Log-Structured-Merge-Tree,即日志结构合并树 很多NoSQL存储都是采用 LSM 树进行支撑的,如HBase、LevelDB、RocksDB 等 它的核心其实是牺牲部分读性能(存储分层设计),追求更好的写性能(顺序写) 那么问题来了,
For more information on added features, seeWhat's new in SQL Server 2022. SQL Server 2019 (15.x) SQL Server 2019 (15.x) adds these new features: Functional Starting with SQL Server 2019 (15.x), the tuple mover is helped by a background merge task that automatically compresses smaller...
Learn about the changes, improvements, and updates in the SQL Server 2019 release of Master Data Services.
Add basic support forhierarchyidtype in SQL Server. Address an issue with an unknown return type for a function called through synonym. Update ODP.NET to v19.3. SSMA v8.2 The v8.2 release of SSMA for Oracle is enhanced to: Add support forDBMS_OUTPUT.ENABLE/DISABLE. ...
To ensure that database objects in SQL scripts are resolved more precisely, we’ve implemented two resolve modes:PlaygroundandScript. The first one is the better option if your file is just a set of unconnected queries that are independent of each other and have no particular sequence. The se...
Power Query is a data transformation and data preparation engine. Power Query comes with a graphical interface for getting data from sources and a Power Query editor for applying transformations. Because the engine is available in many products and services, the destination where the data is stored...
A free graphical user interface, Oracle SQL Developer allows database users and administrators to do their database tasks in fewer clicks and keystrokes. A productivity tool, SQL Developer's main objective is to help the end user save time and maximize the return on investment in the Oracle Da...
Union-based SQLiuses SQL operators to merge select statements and extract information through a single response. Inferential (blind) SQL injection In Inferential or blind SQL injection, attackers indirectly extract information from a database without triggering visible errors. This is more subtle and ob...
This article will show how triggers, indexes, constraints and foreign keys will replicate in snapshot and after snapshot in SQL Server replication. Merge replication is used to replicate data from a publisher to a subscriber database and vice versa. Recently someone at our workplace came to ...
A free graphical user interface, Oracle SQL Developer allows database users and administrators to do their database tasks in fewer clicks and keystrokes. A productivity tool, SQL Developer's main objective is to help the end user save time and maximize the return on investment in the Oracle Da...