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From "Patrick Linskey (JIRA)" <>
Subject [jira] Commented: (OPENJPA-407) Cache SQL (or closer precursors to SQL) more aggressively
Date Fri, 01 Feb 2008 20:19:07 GMT


Patrick Linskey commented on OPENJPA-407:

> > Generally, the patch looks sound. I agree with Christiaan's concerns; we should
> > change the caches to be configurable data structures.
> I'm not convinced that a configurable data structure is necessary. We want the performance
> of OpenJPA to be excellent "out of the box". We made a similar decision when we decided
> turn the Compilation Cache on by default. Maybe that's what you mean... Make it configurable,
> but we can have it turned on by default? If that's the case, then I'm okay with that

Yep. This definitely seems like the sort of thing that should be on by default, with a reasonable
default hard ref size and a soft ref spillover.

> We'll post a more complete patch in the near future.

Excellent... I'm looking forward to reading more.

> Cache SQL (or closer precursors to SQL) more aggressively
> ---------------------------------------------------------
>                 Key: OPENJPA-407
>                 URL:
>             Project: OpenJPA
>          Issue Type: Improvement
>          Components: jdbc, kernel, query, sql
>    Affects Versions: 0.9.0, 0.9.6, 0.9.7, 1.0.0
>            Reporter: Patrick Linskey
>             Fix For: 1.1.0
>         Attachments: findBy.patch, OPENJPA-407.patch
> When data is not available in the data cache, OpenJPA dynamically creates SQL to look
up the requested data. OpenJPA should more aggressively cache this SQL to accelerate pathways
from a cache miss to the database.
> The generated SQL takes a number of factors into account, including the requested records,
transaction status, currently-loaded data, and the current fetch configuration. Any caching
would need to account for these factors as well.

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