private boolean verifyPage(Buffer buffer, long page, int level, Key key, Tree tree) {
        if (buffer.getPageAddress() != page) {
            addFault("Buffer contains wrong page " + buffer.getPageAddress(), page, level, 0);
            return false;
        }

        if (buffer.isDataPage() || buffer.isIndexPage()) {
            long mvvCount = _counters._mvvCount;
            PersistitException ipse = buffer.verify(key, _visitor);
            if (ipse != null) {
                addFault(ipse.getMessage(), page, level, 0);
                key.clear();
                return false;
            }
            if (_counters._mvvCount > mvvCount) {
                _counters._mvvPageCount++;
                if (_prune && !_currentVolume.isReadOnly() && _counters._pruningErrorCount < MAX_PRUNING_ERRORS) {
                    try {
                        buffer.pruneMvvValues(tree, true);
                        _counters._prunedPageCount++;
                    } catch (PersistitException e) {
                        _counters._pruningErrorCount++;
                    }
                }
            }
        }
        return true;
    }