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Permissions for directories containing databases

From IBM DB2 9.7 for Linux, UNIX and Windows Information Center

Quote:

For the directories containing the databases, each and every directory level up to and including NODE000x needs the following permissions:

drwxrwxr-x 11 db2inst1 db2grp1 4096 Jun 14 15:53 NODE0000/

For example, if a database is located in /db2/data/db2inst1/db2inst1/NODE0000 then the directories: /db2, /db2/data, /db2/data/db2inst1, /db2/data/db2inst1/db2inst1 and /db2/data/db2inst1/db2inst1/NODE0000 need drwxrwxr-x.

Can you think of why group needs w(write)? Why can't be drwxr-xr-x ?

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