// insert lastNodePageNumber and V' to L; already unfix page
insertNode(newKey, ByteTool.intToBytes(oldNextPage.getPageNumber()), IDBIndex.STORE_REPLACE, kContext);
// remove the last node from L'; already unfix page
newPage.deleteNode(lastNodeKey, kContext);
// replace V' in parent by lastNode's key
newNode.internalReplaceKey(lastNodeKey.toBytes(), kContext);
}
// unfix this page and new page
buffer.releasePage(pageNumber.getTreeId(), pageNumber, true);