BaseX:插入节点性能问题

Question

当将insert节点与BaseX数据库中的现有节点连接时，我遇到了一些性能问题。

脲酶

我有一个很大的XML文件(大约2GB)，我用它创建了一个BaseX数据库。XML看起来如下(简化)。它有大约350.000 <record>s：

<collection>

  <record>
    <id>ABC007</id>
    <title>The title of the record</title>
    <author>Joe Lastname</author>
    ... [other information]
  </record>

  <record>
    <id>ABC555</id>
    <relation_id>ABC007</relation_id>
    <title>Another title</title>
    <author>Sue Lastname</author>
    ... [other information]
  </record>

  ... [many other <record>s]

</collection>

<record>是相互关联的。一个记录中的<relation_id>指向另一个记录中的<id> (参见上面的示例)。

我在BaseX中所做的是将信息从一个相关记录插入到另一个相关记录，反之亦然。因此，结果如下：

<collection>

  <record>
    <id>ABC007</id>
    <title>The title of the record</title>
    <author>Joe Lastname</author>
    ... [other information]
    <related_record> <!-- Insert this information -->
        <title>Another title</title>
        <author>Sue Lastname</author>
    </related_record>
  </record>

  <record>
    <id>ABC555</id>
    <relation_id>ABC007</relation_id>
    <title>Another title</title>
    <author>Sue Lastname</author>
    ... [other information]
    <related_record> <!-- Insert this information -->
        <title>The title of the record</title>
        <author>Joe Lastname</author>
    </related_record>
  </record>

  ... [many other <record>s that should be enriched with other records data]

</collection>

我使用以下Java代码执行此操作：

// Setting some options and variables
Context context = new Context();
new Set(MainOptions.AUTOFLUSH, false).execute(context);
new Set(MainOptions.AUTOOPTIMIZE, false).execute(context);
new Set(MainOptions.UPDINDEX, true).execute(context);

// Opening the database
new Open('database_name').execute(context);

// Get all records with <relation_id> tags. These are the "child" records and they contain the "parent" record ID.
String queryParentIdsInChild = "for $childRecord in doc('xmlfile.xml')//record[relation_id]
                                return db:node-id($childRecord)"

// Iterate over the child records and get the parent record ID
QueryProcessor parentIdsInChildProc = new QueryProcessor(queryParentIdsInChild, context);
Iter iter = parentIdsInChildProc.iter();
parentIdsInChildProc.close();

for(Item childRecord; (childRecord = iter.next()) != null;) {
    // Create a pointer to the child record in BaseX for convenience
    String childNodeId = childRecord.toString();
    String childNode = "db:open-id('database_name', " + childNodeId + ")";

    // Get some details from the child record. They should be added to the parent record.
    String queryChildDetails = "let $title := data("+childNode+"/title)"
        + " let $author := data("+childNode+"/author)"
        + " return "
        + "<related_record>"
        + "  <title>{$title}</title>"
        + "  <author>{$author}</author>"
        + "</related_record>";
    String childDetails = new XQuery(queryChildDetails).execute(context);   

    // Create a pointer to the parent record in BaseX for convenience
    parentNode = (... similar procedure like getting the child node, therefore skiping that code here)

    // PERFORMANCE ISSUE HERE!!!
    // Insert the child record details to the parent node
    String parentUpdate = "insert node " + childDetails + " into " + parentNode;
    new XQuery(parentUpdate).execute(context);
}

... flushing and optimizing code here

问题

问题是，当将新节点插入到<record>时，我遇到了大量的性能问题。在一个具有大约10.000 <record>s的较小的测试数据库中，插入的执行速度相当快--大约在7秒内。当我用大约350.000 <record>s在我的生产数据库中运行相同的代码时，一个插入操作需要几秒钟，甚至几分钟！而且会有数千个这样的插入，所以肯定要花费太长时间。

问题

我对BaseX非常陌生，而且我肯定不是最有经验的Java程序员。也许我只是忽略了什么或者犯了个愚蠢的错误。所以我在问有没有人给我个提示。有什么问题吗？是Java代码吗？还是350.000 <record>s的BaseX数据库太大，无法进行插入操作？如果是，有解决办法吗？或者BaseX (或者一般的XML数据库)不是这个使用过程的正确工具吗？

进一步信息

我在Ubuntu18.04上使用BaseX 9.0.2作为独立模式.在运行上述代码之前，我已经做了一个“优化所有”。

Answer 1

我想我没有正确地运行optimize。在我再次optimized之后，insert命令运行得非常快。现在，大约有10000个插入在一秒钟内执行。也许这也对我使UPDINDEX和AUTOOPTIMIZE失效有所帮助。