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Java > Open Source Codes > org > apache > derby > iapi > sql > LanguageProperties


1 /*
2
3    Derby - Class org.apache.derby.iapi.sql.LanguageProperties
4
5    Licensed to the Apache Software Foundation (ASF) under one or more
6    contributor license agreements. See the NOTICE file distributed with
7    this work for additional information regarding copyright ownership.
8    The ASF licenses this file to you under the Apache License, Version 2.0
9    (the "License"); you may not use this file except in compliance with
10    the License. You may obtain a copy of the License at
11
12       http://www.apache.org/licenses/LICENSE-2.0
13
14    Unless required by applicable law or agreed to in writing, software
15    distributed under the License is distributed on an "AS IS" BASIS,
16    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17    See the License for the specific language governing permissions and
18    limitations under the License.
19
20  */
21
22 package org.apache.derby.iapi.sql;
23
24 /**
25  * This is a holder of language properties that are
26  * exposed users. Consolodate all properties here.
27  */
28 public interface LanguageProperties
29 {
30     /*
31     ** BulkFetch
32     **
33     ** The default size needs some explaining. As
34     ** of 7/14/98, the most efficient way for access
35     ** to return rows from a table is basically by
36     ** reading/qualifying/returning all the rows in
37     ** one page. If you are read in many many rows
38     ** at a time the performance gain is only marginally
39     ** better. Anyway, since even a small number of
40     ** rows per read helps, and since there is no good
41     ** way to get access to retrieve the rows page
42     ** by page, we use 16 totally arbitrarily. Ultimately,
43     ** this should be dynamically sized -- in which
44     ** case we wouldn't need this default.
45     */
46     static final String JavaDoc BULK_FETCH_PROP = "derby.language.bulkFetchDefault";
47     static final String JavaDoc BULK_FETCH_DEFAULT = "16";
48     static final int BULK_FETCH_DEFAULT_INT = 16;
49 }
50
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