FW: re[9]: [Jdbm-developer] DBCache discussion

[Thompson, B. B. <BRY...@sa...>]

This is forward since the original was getting too large for the default
acceptance policy on the list.  I've reverted to a plain test message.

-b

-----Original Message-----
From: jdb...@li...
[mailto:jdb...@li...] On Behalf Of Thompson,
Bryan B.
Sent: Friday, January 20, 2006 11:42 AM
To: Kevin Day; JDBM Developer listserv
Subject: RE: re[9]: [Jdbm-developer] DBCache discussion


I'm not sure that I understand the distinction between the "row" and the
"object" level for locking.  The
physical row is the space on one more pages where a serialized object is
written.  The logical row is
the slot in the translation page for a given OID.  The object is the
transient Java instance from either
object creation or de-serialization of an existing row.  We also have
serialized objects which might
not be written onto a page image yet -- buffering serialized objects is
especially useful for clustering
since you can use more batch oriented allocation strategies for laying down
the serialized objects
onto pages (one of the hotspots in jdbm today).

-bryan