如何使休眠查询更快

Question

I am currently working on a task to improve performance of an action and the slowest part of code is this hibernate query:

.createQuery( "SELECT distinct p FROM CSParcel p " +
                              " WHERE p.bag.destination.loop.line.changeover.barcode = :barcode AND p.created > :limit " +
                              " AND (p.bag.destination.loop.courierLoop.id = :courierId OR p.bag.destination.loop.line.courier.id = :courierId)" +
                              " AND p.latestAction.actionType <> :doruceni" + " AND p.id NOT IN " +
                              "(SELECT pa.parcel.id " + "   FROM CSParcelAction pa " +
                              " WHERE pa.actionType = :predani AND pa.courier.id = :courierId AND pa.timestamp > :limit" +
                              ")", CSParcel.class )
                .setParameter( "barcode", changeoverBarcode.toUpperCase() )
                .setParameter( "limit", Time.setTime( 0, 0, 0, cal.getTime() ) )
                .setParameter( "courierId", courierId )
                .setParameter( "predani", CSParcelActionType.CHANGEOVER )
                .setParameter( "doruceni", CSParcelActionType.DELIVERY )
                .getResultList();

are there any ways to make it run faster?

Thank you for every suggestion.

Answer 1

You can monitor with some tools and you will see how queries behave, normally adding some indices where is needed is enough, if you databases alredy have indices you can do some kind of maintenance to tables you use. Here is some information

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