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数据更改通知性能影响

[英]Data Change Notification performance impact

原文 2018-04-04 00:48:24 7 1 java/ oracle

I built a simple application that is monitoring Oracle's DB on a single table. 我构建了一个简单的应用程序，该应用程序在单个表上监视Oracle的数据库。 I tried to test performance impact of enabled subscription and was unpleased surprised that degradation is about x2 for inserting about 10000 records each in standalone transaction. 我试图测试启用的订阅对性能的影响，但对于在独立事务中每个插入约10000条记录的降级大约是x2，我感到很惊讶。

without subscription 10k insert ~ 30 sec 无订阅10k插入〜30秒
with subscription ROWID granularity 10k insert ~ 60 sec 订阅ROWID粒度为10k插入〜60秒

If I set: 如果我设置：

OracleConnection.DCN_NOTIFY_ROWIDS, "false" OracleConnection.DCN_QUERY_CHANGE_NOTIFICATION, "false" OracleConnection.DCN_NOTIFY_ROWIDS，“假” OracleConnection.DCN_QUERY_CHANGE_NOTIFICATION，“假”

then all degradation is vanishing but I need to get details of updates. 那么所有降级都将消失，但是我需要获取更新的详细信息。 I removed all extra processing from client side so this is all about subscription overhead. 我从客户端删除了所有多余的处理，所以这全部与订阅开销有关。

I am wondering is it so expensive by nature or I can tune this somehow? 我想知道它天生如此昂贵，还是我可以以某种方式调整它？

1 个解决方案

Database change notification has an overhead during commit. 数据库更改通知在提交过程中有开销。 This can't be tuned. 这是无法调整的。 Note that this feature is designed for read-mostly tables that are worth being cached on the client/mid-tier. 请注意，此功能是为需要在客户端/中间层上缓存的只读表而设计的。 One trick might be to unregister your app during batch inserts. 一种技巧可能是在批量插入过程中注销您的应用程序。