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DataNucleus Core provides the primary components of a heterogenous Java persistence solution. It supports persistence API's being layered on top of the core functionality.

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package org.datanucleus.management;

/**
 * Interface defining the MBean for a persistence manager.
 */
public interface ManagerStatisticsMBean
{
    String getRegisteredName();

    int getQueryActiveTotalCount();

    int getQueryErrorTotalCount();

    int getQueryExecutionTotalCount();

    long getQueryExecutionTimeLow();

    long getQueryExecutionTimeHigh();

    long getQueryExecutionTotalTime();

    long getQueryExecutionTimeAverage();

    int getNumberOfDatastoreWrites();

    int getNumberOfDatastoreReads();

    int getNumberOfDatastoreWritesInLatestTxn();

    int getNumberOfDatastoreReadsInLatestTxn();

    int getNumberOfObjectFetches();

    int getNumberOfObjectInserts();

    int getNumberOfObjectUpdates();

    int getNumberOfObjectDeletes();

    long getTransactionExecutionTimeAverage();

    long getTransactionExecutionTimeLow();

    long getTransactionExecutionTimeHigh();

    long getTransactionExecutionTotalTime();

    int getTransactionTotalCount();

    int getTransactionActiveTotalCount();

    int getTransactionCommittedTotalCount();

    int getTransactionRolledBackTotalCount();
}