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From "Alexey Loshkarev (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COUCHDB-1382) Use term_to_binary with minor_version=1 to reduce disk size of data and indexes
Date Wed, 18 Jan 2012 12:27:39 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-1382?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13188425#comment-13188425
] 

Alexey Loshkarev commented on COUCHDB-1382:
-------------------------------------------

Also, with my data sample, minor_version=1 reduces database size to ~12% (~800MB vs ~900MB)
                
> Use term_to_binary with minor_version=1 to reduce disk size of data and indexes
> -------------------------------------------------------------------------------
>
>                 Key: COUCHDB-1382
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-1382
>             Project: CouchDB
>          Issue Type: Improvement
>          Components: Database Core
>    Affects Versions: 1.1.1
>         Environment: doesn't matter
>            Reporter: Alexey Loshkarev
>            Priority: Trivial
>
> Now, couchdb store data using term_to_binary/1 (with no options).
> According manual, term_to_binary/2 has option minor_version, which value 1 changes storage
format for floats.
> Default behaviour, float consume 33 bytes of disk space.
> With minor_version=1, float consume only 9 bytes of disk space.
> minor_version=1 is supported since Erlance 11B-4, but minimum couchdb supported erlang
version is still 13, so no problem to implement this.
> Also, term_to_binary/2 has "compressed" option, it may also reduce disk space, but will
use more cpu for that.

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