I am installing my Postfix server.

I am reading about the configuration options.

I see that there are many formats to use for lookups.

I see for exanple this

...

smtpd_tls_session_cache_database = btree:/var/lib/postfix/smtpd_scache
smtp_tls_session_cache_database = btree:/var/lib/postfix/smtp_scache

alias_maps = hash:/etc/aliases

...

in one example doc.

I can understand that there ARE diferences.  I do not understand when to use 
which one.

For example I have heard about the LMDB format from the OpenLDAP project.  I 
hear that it is fast and lightweight and some persons say one of the best 
options.

So is it best or even ok to do this?


...

smtpd_tls_session_cache_database = lmdb:/var/lib/postfix/smtpd_scache
smtp_tls_session_cache_database = lmdb:/var/lib/postfix/smtp_scache

alias_maps = lmdb:/etc/aliases

...

I am just wanting to know when to use which type?

Arun

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