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Take 8.1.7.4.0 as an example:
8: Version number
1: New feature version number
7: Maintenance version number
4: Ordinary patch setting number
0: Special platform patch setting number
In addition, regarding the issue of Oracle being 32bit/64bit, the explanation is as follows:
In windows/linux systems, since the operating system is 32bit, Oracle must be 32bit;
In tru64, Oracle must be 64bit;
In hpux/aix/solaris, it depends on the specific situation. If it is 64bit, the word 64bit will be displayed when starting sqlplus on the server. You can also pass
select * from v$version; or $ file $ORACLE_HOME/bin/oracle|more to view, such as:
/data1/app/oracle /product/8.1.7/bin/oracle: ELF-64 executable object file -
PA-RISC 2.0 (LP64)
If you want to support SGA larger than 1.75GB, it is recommended to use 64Bit oracle. 32bit Oracle has SGA size restrictions. Although many platforms have ways to bypass it, allowing you to open it larger, it is not as convenient as using 64Bit directly, and even if you bypass it, you still cannot open it very large. There is not much difference in other aspects.