Thee size of the primary key cannot exceed approximately one database block.

主键大小不能超过一个数据块大小。 。

youdao

A processor core then picks up the uncompressed, filtered data block and performs fundamental database operations such as sorts, joins, and aggregations.

处理器内核随后选出未压缩的、过滤后的数据块，执行基本的数据库操作，如排序、联接和聚合。

youdao

Specifically, if everything is happening in the UI thread, performing long operations such as network access or database queries will block the whole UI.

如果UI线程需要处理每一件事情，那些耗时很长的操作——诸如访问网络或查询数据库等——将会阻塞整个UI(线程)。

youdao

An example of an application that does not work well in a simple cloud environment is a shared database, such as the typical Oracle database application, where the information is one big block of data that needs to be manipulated all the time by many computing processes and where access to the shared data needs to be synchronized and managed.

FORBES: Moore's Law: Why It Matters Now More Than Ever

Youku has developed a sophisticated monitoring system: dozens of editors watch new material and classify it, building a video database that can be used to find good content, but also to block undesirable clips.

ECONOMIST: Chinese internet companies