Aliyun ECS reads data from OSS or RDS through the intranet. Which is faster?

my project needs to read some data to RDS through Aliyun ECS, but I don"t think it will be faster to read the data on OSS.

my ECS,RDS,OSS is all on the same node, so it can be accessed through the intranet. But I don"t know which is faster.

Rds oss
Jun.14,2022

OSS is faster if you just read it.

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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-64f5-1ea7789-46b9e.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1ea7789-46b9e.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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