[ZODB-Dev] [ zodb-Bugs-653330 ] _sane() is unnecessary

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Bugs item #653330, was opened at 2002-12-13 16:38
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Jeremy Hylton (jhylton)
Assigned to: Nobody/Anonymous (nobody)
Summary: _sane() is unnecessary

Initial Comment:
Every time a FileStorage is opened the _sane() method
is called to look for the last old-style-undo
transaction.  In many storages, there will be no such
transaction, and _sane() will read the entire storage
backwards.  This is expensive and unnecessary.  

It may be possible for read_index() to keep track of
the last 'u' transaction it sees to avoid the backwards
search.


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