CouchDB does not return total_rows when executing the _ find method with limit

as the title, couchDB does not know that I do not understand the concept of this document database, I always feel too difficult to use. There is no way to return the total amount of total by paging and executing _ find now. Ask the great god to see, please help!

Couchdb
Jan.08,2022

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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-64f5-1b3bf5a-2c2ca.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3bf5a-2c2ca.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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