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Bob Halley 1999-02-22 20:12:04 +00:00
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doc/design/database
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@ -112,16 +112,16 @@ Database Versioning
Versioning is not available in cache databases.
A zone database has a "current version" which is the version most recently
committed. A database has a set of versions open for reading (the
"open versions"). This set is always non-empty, since the current
version is always open. The openversion method opens a read-only
handle to the current version. All retrievals using the handle will
see the database as it was at the time the version was opened,
regardless of subsequent changes to the database. It is not possible
to open a specific version; only the current version may be opened.
This helps limit the number of prior versions which must be kept in
the database.
A zone database has a "current version" which is the version most
recently committed. A database has a set of versions open for reading
(the "open versions"). This set is always non-empty, since the
current version is always open. The openversion method opens a
read-only handle to the current version. All retrievals using the
handle will see the database as it was at the time the version was
opened, regardless of subsequent changes to the database. It is not
possible to open a specific version; only the current version may be
opened. This helps limit the number of prior versions which must be
kept in the database.
Each zone update transaction is assigned a new version. Only one such
"future version" may be open at any time. It is the caller's