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Change-Id: If1c1d988c6918289e9f7f48abdd38775eb3174b0 Reviewed-on: http://gerrit.cloudera.org:8080/8693 Reviewed-by: Alex Behm <alex.behm@cloudera.com> Tested-by: Impala Public Jenkins
62 lines
2.2 KiB
XML
62 lines
2.2 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!--
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Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
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"License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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-->
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<!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="batch_size">
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<title>BATCH_SIZE Query Option</title>
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<titlealts audience="PDF"><navtitle>BATCH_SIZE</navtitle></titlealts>
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<prolog>
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<metadata>
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<data name="Category" value="Impala"/>
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<data name="Category" value="Impala Query Options"/>
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<data name="Category" value="Developers"/>
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<data name="Category" value="Data Analysts"/>
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<data name="Category" value="Querying"/>
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<data name="Category" value="Performance"/>
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</metadata>
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</prolog>
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<conbody>
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<p>
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<indexterm audience="hidden">BATCH_SIZE query option</indexterm>
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Number of rows evaluated at a time by SQL operators. Unspecified or a size of 0 uses a predefined default
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size. Using a large number improves responsiveness, especially for scan operations, at the cost of a higher memory footprint.
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</p>
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<p>
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This option is primarily for testing during Impala development, or for use under the direction of <keyword keyref="support_org"/>.
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</p>
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<p>
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<b>Type:</b> numeric
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</p>
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<p>
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<b>Default:</b> 0 (meaning the predefined default of 1024)
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</p>
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<p rev="2.11.0 IMPALA-5541">
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<b>Range:</b> 0-65536. The value of 0 still has the special meaning of <q>use the default</q>,
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so the effective range is 1-65536. The maximum applies in <keyword keyref="impala211_full"/> and higher.
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</p>
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</conbody>
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</concept>
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