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/**
* Copyright (C) 2014 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
namespace mongo {
//
// multi-plan ranking
//
// Max number of times we call work() on plans before comparing them,
// for small collections.
extern int internalQueryPlanEvaluationWorks;
// For large collections, the number times we work() candidate plans is
// taken as this fraction of the collection size.
extern double internalQueryPlanEvaluationCollFraction;
// Stop working plans once a plan returns this many results.
extern int internalQueryPlanEvaluationMaxResults;
// Do we give a big ranking bonus to intersection plans?
extern bool internalQueryForceIntersectionPlans;
// Do we have ixisect on at all?
extern bool internalQueryPlannerEnableIndexIntersection;
// Do we use hash-based intersection for rooted $and queries?
extern bool internalQueryPlannerEnableHashIntersection;
//
// plan cache
//
// How many entries in the cache?
extern int internalQueryCacheSize;
// How many feedback entries do we collect before possibly evicting from the cache based on bad
// performance?
extern int internalQueryCacheFeedbacksStored;
// How many stddevs must a feedback be from the 'reference' performance for us to evict the
// entry from the cache?
extern double internalQueryCacheStdDeviations;
// How many write ops should we allow in a collection before tossing all cache entries?
extern int internalQueryCacheWriteOpsBetweenFlush;
// Whether or not CachedPlanStage replanning is enabled.
extern bool internalQueryCacheReplanningEnabled;
// How many times more works must we perform in order to justify plan cache eviction and
// replanning?
extern double internalQueryCacheEvictionRatio;
//
// Planning and enumeration.
//
// How many indexed solutions will QueryPlanner::plan output?
extern int internalQueryPlannerMaxIndexedSolutions;
// How many solutions will the enumerator consider at each OR?
extern int internalQueryEnumerationMaxOrSolutions;
// How many intersections will the enumerator consider at each AND?
extern int internalQueryEnumerationMaxIntersectPerAnd;
// Do we want to plan each child of the OR independently?
extern bool internalQueryPlanOrChildrenIndependently;
// How many index scans are we willing to produce in order to obtain a sort order
// during explodeForSort?
extern int internalQueryMaxScansToExplode;
//
// Query execution.
//
extern int internalQueryExecMaxBlockingSortBytes;
// Yield after this many "should yield?" checks.
extern int internalQueryExecYieldIterations;
// Yield if it's been at least this many milliseconds since we last yielded.
extern int internalQueryExecYieldPeriodMS;
} // namespace mongo
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