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/*------------------------------------------------------------------------- * * cost.h * prototypes for costsize.c and clausesel.c. * * * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * $PostgreSQL: pgsql/src/include/optimizer/cost.h,v 1.90 2008/01/01 19:45:58 momjian Exp $ * *------------------------------------------------------------------------- */ #ifndef COST_H #define COST_H #include "nodes/plannodes.h" #include "nodes/relation.h" /* defaults for costsize.c's Cost parameters */ /* NB: cost-estimation code should use the variables, not these constants! */ /* If you change these, update backend/utils/misc/postgresql.sample.conf */ #define DEFAULT_SEQ_PAGE_COST 1.0 #define DEFAULT_RANDOM_PAGE_COST 4.0 #define DEFAULT_CPU_TUPLE_COST 0.01 #define DEFAULT_CPU_INDEX_TUPLE_COST 0.005 #define DEFAULT_CPU_OPERATOR_COST 0.0025 #define DEFAULT_EFFECTIVE_CACHE_SIZE 16384 /* measured in pages */ /* * prototypes for costsize.c * routines to compute costs and sizes */ /* parameter variables and flags */ extern PGDLLIMPORT double seq_page_cost; extern PGDLLIMPORT double random_page_cost; extern PGDLLIMPORT double cpu_tuple_cost; extern PGDLLIMPORT double cpu_index_tuple_cost; extern PGDLLIMPORT double cpu_operator_cost; extern PGDLLIMPORT int effective_cache_size; extern Cost disable_cost; extern bool enable_seqscan; extern bool enable_indexscan; extern bool enable_bitmapscan; extern bool enable_tidscan; extern bool enable_sort; extern bool enable_hashagg; extern bool enable_nestloop; extern bool enable_mergejoin; extern bool enable_hashjoin; extern bool constraint_exclusion; extern double clamp_row_est(double nrows); extern double index_pages_fetched(double tuples_fetched, BlockNumber pages, double index_pages, PlannerInfo *root); extern void cost_seqscan(Path *path, PlannerInfo *root, RelOptInfo *baserel); extern void cost_index(IndexPath *path, PlannerInfo *root, IndexOptInfo *index, List *indexQuals, RelOptInfo *outer_rel); extern void cost_bitmap_heap_scan(Path *path, PlannerInfo *root, RelOptInfo *baserel, Path *bitmapqual, RelOptInfo *outer_rel); extern void cost_bitmap_and_node(BitmapAndPath *path, PlannerInfo *root); extern void cost_bitmap_or_node(BitmapOrPath *path, PlannerInfo *root); extern void cost_bitmap_tree_node(Path *path, Cost *cost, Selectivity *selec); extern void cost_tidscan(Path *path, PlannerInfo *root, RelOptInfo *baserel, List *tidquals); extern void cost_subqueryscan(Path *path, RelOptInfo *baserel); extern void cost_functionscan(Path *path, PlannerInfo *root, RelOptInfo *baserel); extern void cost_valuesscan(Path *path, PlannerInfo *root, RelOptInfo *baserel); extern void cost_sort(Path *path, PlannerInfo *root, List *pathkeys, Cost input_cost, double tuples, int width, double limit_tuples); extern bool sort_exceeds_work_mem(Sort *sort); extern void cost_material(Path *path, Cost input_cost, double tuples, int width); extern void cost_agg(Path *path, PlannerInfo *root, AggStrategy aggstrategy, int numAggs, int numGroupCols, double numGroups, Cost input_startup_cost, Cost input_total_cost, double input_tuples); extern void cost_group(Path *path, PlannerInfo *root, int numGroupCols, double numGroups, Cost input_startup_cost, Cost input_total_cost, double input_tuples); extern void cost_nestloop(NestPath *path, PlannerInfo *root); extern void cost_mergejoin(MergePath *path, PlannerInfo *root); extern void cost_hashjoin(HashPath *path, PlannerInfo *root); extern void cost_qual_eval(QualCost *cost, List *quals, PlannerInfo *root); extern void cost_qual_eval_node(QualCost *cost, Node *qual, PlannerInfo *root); extern Cost get_initplan_cost(PlannerInfo *root, SubPlan *subplan); extern void set_baserel_size_estimates(PlannerInfo *root, RelOptInfo *rel); extern void set_joinrel_size_estimates(PlannerInfo *root, RelOptInfo *rel, RelOptInfo *outer_rel, RelOptInfo *inner_rel, JoinType jointype, List *restrictlist); extern void set_function_size_estimates(PlannerInfo *root, RelOptInfo *rel); extern void set_values_size_estimates(PlannerInfo *root, RelOptInfo *rel); /* * prototypes for clausesel.c * routines to compute clause selectivities */ extern Selectivity clauselist_selectivity(PlannerInfo *root, List *clauses, int varRelid, JoinType jointype); extern Selectivity clause_selectivity(PlannerInfo *root, Node *clause, int varRelid, JoinType jointype); #endif /* COST_H */