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https://issues.apache.org/jira/browse/DERBY-646?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12676783#action_12676783
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Rick Hillegas commented on DERBY-646:
-------------------------------------
For the first time in the history of the Derby community, two complete
implementations of a significant feature have surfaced almost simultaneously.
I'm afraid we have to pick one. I hope that the other contributor does not feel
snubbed. Thanks to Kristian and Cheng for these two great submissions.
I have taken a quick look at the patches and at the commentary on this JIRA. I
prefer Kristian's implementation for the following reasons:
1) The coding style is slightly easier for me to understand.
2) According to the performance data which Kristian posted, his implementation
is slightly faster.
I hope that Cheng's ICLA arrives soon so that we can mine his patch for ideas
that can be layered on top of Kristian's work. For instance,
A) Cheng's solution lets you snapshot the database to disk at shutdown time. I
think some users will find this useful. I understand that we could simulate
this behavior using backup and restore, but I would not discount the appeal of
this automatic behavior. Perhaps the api here could be an additional
subprotocol.
B) Cheng's solution has a finalizer method. This seems particularly useful for
delivering (A) in the face of a system crash. But winddown logic seems
generally useful for a complicated program like an rdbms.
C) Cheng provides some additional tests. Some of these tests may be
implementation-agnostic and worth running against Kristian's implementation. It
would be helpful if Cheng could describe these tests in greater detail so that
we can decide whether to incorporate them.
Thanks again to both Kristian and Cheng.
> In-memory backend storage support
> ---------------------------------
>
> Key: DERBY-646
> URL: https://issues.apache.org/jira/browse/DERBY-646
> Project: Derby
> Issue Type: New Feature
> Components: Store
> Environment: All
> Reporter: Stephen Fitch
> Attachments: derby-646-1a-raw-compiles.diff,
> derby-646-1a-raw-compiles.stat, derby-646-20090222.diff,
> derby-646-20090222.stat, derby-646-2a-vfmem_first_rev.diff,
> derby-646-2a-vfmem_first_rev.stat, derby-646-performance_comparison_1a.txt,
> svn.diff
>
>
> To allow creation and modification of databases in-memory without requiring
> disk access or space to store the database.
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