How can php7.1 be optimized to achieve the best performance?

the server has 8 cores of cpu,16G memory, and centos7.3.1611
has been installed with opcache, enabled. All configurations are defaulted

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Mar.07,2021

there is nothing to optimize. Generally, 99% of the bottlenecks are in the database. What do you want to optimize and what can you optimize?

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-64f5-1b372ab-2c066.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b372ab-2c066.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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