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If you take an Oracle 10.1.0.4 database, modify the parameter optimizer_features_enable to 8.1.7, 9.2.0, and 10.1.0 in turn, and capture the system parameters in a table, you can then query the table to see which other parameters change at the same time. Table B-1 summarizes the 48 parameters (many of them hidden parameters) affected. Some of these parameters don t even exist in 9i or 8i.
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APPENDIX B OPTIMIZER PARAMETERS
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Table B-1. Parameters Affected by optimizer_features_enable (10g)
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_always_anti_join _always_semi_join _b_tree_bitmap_plans _complex_view_merging _cost_equality_semi_join _cpu_to_io _generalized_pruning_enabled _gs_anti_semi_join_allowed _index_join_enabled _load_without_compile _local_communication_costing_enabled _new_initial_join_orders _new_sort_cost_estimate _optim_adjust_for_part_skews _optim_new_default_join_sel _optim_peek_user_binds _optimizer_compute_index_stats _optimizer_correct_sq_selectivity _optimizer_cost_based_transformation _optimizer_cost_model _optimizer_dim_subq_join_sel _optimizer_join_order_control _optimizer_join_sel_sanity_check _optimizer_max_permutations _optimizer_new_join_card_computation _optimizer_skip_scan_enabled _optimizer_squ_bottomup _optimizer_system_stats_usage _optimizer_undo_cost_change _ordered_nested_loop _parallel_broadcast_enabled _partition_view_enabled _pre_rewrite_push_pred
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choose choose true true true 0 true true true none true true true true true true true true linear choose true 3 true 2000 true true true true 10.1.0 true true true true
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choose choose true true true 0 true true true none false *** true true true true true false false off choose false 0 false 2000 true true false true 9.2.0 true true false true
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off *** off *** false false false 100 *** false false false none false false false false false false false false off io false 0 false 80000 false false false false 8.1.7 false false false false
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APPENDIX B OPTIMIZER PARAMETERS
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Table B-1. Parameters Affected by optimizer_features_enable (10g)
Name
_pred_move_around _push_join_predicate _push_join_union_view _push_join_union_view2 _query_rewrite_setopgrw_enable _remove_aggr_subquery _right_outer_hash_enable _table_scan_cost_plus_one _union_rewrite_for_gs _unnest_subquery optimizer_dynamic_sampling optimizer_features_enable optimizer_mode query_rewrite_enabled skip_unusable_indexes
true true true true true true true true yes_gset_mvs true 2 10.1.0 all_rows true true
true true true false false false false true yes_gset_mvs*** true 1 9.2.0 choose false false
false false false false false false false false off false 0 8.1.7 choose false false
*** There are some parameters where the default value of the parameter in the real version of the database does not agree with the value set by Oracle 10g. The differences are as follows: * _always_anti_join defaults to nested_loops, not off in 8.1.7.4. * _always_semi_join defaults to standard, not off in 8.1.7.4. * _cpu_to_io defaults to null, not 100 in 8.1.7.4. * _union_rewrite_for_gs defaults to choose not yes_gset_mvs in 9.2.0.6. * _local_communication_costing_enabled defaults to true, not false in 9.2.0.6 (this parameter probably relates to RAC, rather than distributed queries. I have never been able to find any difference in costs between distributed queries and single database queries).
The 10053 Trace File
When you enable the CBO trace (event 10053) at level 1, an early section of the trace file shows the list of optimizer-related parameters. This varies quite significantly from version to version, so I have included Table B-2 here, cross-referencing the values reported by the different versions. I find it particularly useful to refer to this from time to time when upgrading a system, keeping a careful eye on the parameters that change from false to true (e.g., unnest_subquery). Sometimes a performance problem can appear because a new feature has been enabled and this list may tell you which feature is the one that doesn t work well with your data distribution. The driving feature of this list is the 10g parameter set. Any parameters that are hidden in 10g but not hidden in earlier versions have their values marked with ** in the columns of the versions where they used to be visible parameters.
APPENDIX B OPTIMIZER PARAMETERS
Table B-2. Cross-reference of Parameters Listed in the 10053 Trace File
Name
_add_stale_mv_to_dependency_list _always_anti_join _always_semi_join _always_star_transformation _b_tree_bitmap_plans _bt_mmv_query_rewrite_enabled _complex_view_merging _convert_set_to_join _cost_equality_semi_join _cpu_to_io _default_non_equality_sel_check _disable_datalayer_sampling _disable_function_based_index _distinct_view_unnesting _dml_monitoring_enabled _eliminate_common_subexpr _enable_type_dep_selectivity _fast_full_scan_enabled _fic_area_size _force_datefold_trunc _force_temptables_for_gsets (10g) _gsets_always_use_temptables (9i) _full_pwise_join_enabled _generalized_pruning_enabled _gs_anti_semi_join_allowed _hash_join_enabled _hash_multiblock_io_count _improved_outerjoin_card _improved_row_length_enabled _index_join_enabled _left_nested_loops_random _like_with_bind_as_equality
true choose choose false true true true false true 0 true false false false true true true true 131072 false false true true true true 0 true true true true false
choose choose false true
false false
true
false
0 true true
true true
true true
false
true true ** 0 true true true true ** 0 true true false
false
APPENDIX B OPTIMIZER PARAMETERS
Table B-2. Cross-reference of Parameters Listed in the 10053 Trace File (Continued)
Name
_local_communication_costing_enabled _local_communication_ratio _minimal_stats_aggregation _mmv_query_rewrite_enabled _nested_loop_fudge _new_initial_join_orders _new_sort_cost_estimate _no_or_expansion _oneside_colstat_for_equijoins _optim_adjust_for_part_skews _optim_enhance_nnull_detection _optim_new_default_join_sel _optim_peek_user_binds _optimizer_adjust_for_nulls _optimizer_block_size _optimizer_cache_stats _optimizer_cbqt_factor _optimizer_cbqt_no_size_restriction _optimizer_compute_index_stats _optimizer_correct_sq_selectivity _optimizer_cost_based_transformation _optimizer_cost_filter_pred _optimizer_cost_model _optimizer_degree _optimizer_dim_subq_join_sel _optimizer_disable_strans_sanity_checks _optimizer_ignore_hints _optimizer_join_order_control _optimizer_join_sel_sanity_check _optimizer_max_permutations _optimizer_mjc_enabled _optimizer_mode_force
true 50 true false 100 true true false true true true true true true 8192 false 50 true true true linear false choose 0 true 0 false 3 true 2000 true true
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