（重新）使用spacespaceindex庫加載R樹

Question

我正在使用spaceindex（http://libspatialindex.github.com/）庫批量加載R樹：

string baseName = "streets";
size_t capacity = 10 * 1024 * 1024;
bool bWriteThrough = false;
indexIdentifier = 0;

IStorageManager *disk = StorageManager::createNewDiskStorageManager(baseName, 512);
fileInMem = StorageManager
   ::createNewRandomEvictionsBuffer(*disk, capacity, bWriteThrough);

// bulkLoads my tree
bulkLoadRTree();

cout << "tree info:" << endl;
cout << *tree << endl;

delete disk;

以下是有關已構建樹的信息的輸出：

    Dimension: 2 
    Fill factor: 0.7 
    Index capacity: 100 
    Leaf capacity: 100 
    Tight MBRs: enabled 
    Near minimum overlap factor: 32 
    Reinsert factor: 0.3 
    Split distribution factor: 0.4 
    Utilization: 69% 
    Reads: 1 
    Writes: 35980 
    Hits: 0 
    Misses: 0 
    Tree height: 4 
    Number of data: 2482376 
    Number of nodes: 35979 
    Level 0 pages: 35463 
    Level 1 pages: 507 
    Level 2 pages: 8 
    Level 3 pages: 1 
    Splits: 0 
    Adjustments: 0 
    Query results: 0 

現在，我正在嘗試加載磁盤中保存的內容：

IStorageManager *ldisk = StorageManager::loadDiskStorageManager(baseName);
SpatialIndex::StorageManager::IBuffer* fileLoadBuffer = StorageManager
    ::createNewRandomEvictionsBuffer(*ldisk, capacity, bWriteThrough);

id_type id = 1;
tree = RTree::loadRTree(*fileLoadBuffer, id);
cout << *tree << endl;

並且樹只有一個節點（樹的輸出是：）

    Dimension: 2
    Fill factor: 0.7
    Index capacity: 100
    Leaf capacity: 100
    Tight MBRs: enabled
    Near minimum overlap factor: 32
    Reinsert factor: 0.3
    Split distribution factor: 0.4
    Utilization: 0%
    Reads: 0
    Writes: 0
    Hits: 0
    Misses: 0
    Tree height: 1
    Number of data: 0
    Number of nodes: 1
    Level 0 pages: 1
    Splits: 0
    Adjustments: 0
    Query results: 0

我做錯了什么？ 為什么不從磁盤加載整個樹？

Answer 1

您是否可能未將更改同步到光盤？

另外，通常會在磁盤上實現樹，而在第一次訪問時不會完全讀取它。 因此，它目前無法報告准確的統計信息。

也許您的bulkLoadRTree不使用fileInMem 。

Answer 2

必須刪除fileInMem，以便將頁面進一步發送回磁盤，並進一步發送回刪除* disk。 在刪除磁盤之前，需要添加以下行：

delete fileInMem