[oracle@node1 ~]$ sqlplus / as sysdba

SQL*Plus: Release 21.0.0.0.0 - Production on Wed Sep 15 21:52:38 2021
Version 21.3.0.0.0

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Connected to:
Oracle Database 21c Enterprise Edition Release 21.0.0.0.0 - Production
Version 21.3.0.0.0

SQL>

Oracle Database 21c Enterprise Edition Release 21.0.0.0.0 - Production
21c企业版本21.0.0.0
Version 21.3.0.0.0
这个21.3.0.0.0 信息是干嘛的？？？