What does the sub-database and sub-table partition of the database mean?

what do you mean by sub-database and sub-table partitioning of the database?

Sub-library-and-sub-table mysql database
Mar.10,2021

Database sub-table: split a single business table redundant in a single database into N "logically related" business child tables;
Database sub-database: divide the business tables in the original single database into N "logically related" databases according to some algorithms;
Database partitioning: divide databases that were previously stored in a single physical storage area into less than N physical storage areas.

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3475f-2bf10.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3475f-2bf10.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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