Oracle CBO Transformation-FPD(filter push-down)
对于用户写的SQL，Oracle会进行等价改写。这种改写转换都是基于一种固定的算法，也叫启发式转换，大多存在问题，比如我们写in，oracle在有可能的情况下，会将in转换成exist，然后用semi join的方式给你做join，在一般情况下exist比in...
一.Oracle不做transformation，这时你就要去分析原因
二.Orale做错了transformation，导致了错误的结果集.(复杂的视图)
join：
inner-join：等值连接
outer-join：外连接
semi-join：exist，oracle用一个列匹配另外的列，当只要有一个值匹配成功即结束。不会遍历所有的值。
anti-join：not exist（或者 not in）这种情况。
view：
Simple：能拿到rowid，那么就是一个简单的view，结果集拿不到rowid就是复杂的view。
Complex（复杂view）：包含聚合函数 如distinct，group by ，connect by，只要有递归查询这用view，我们就称之为复杂的view。
in-line view：相当于子查询
sub-query：
=in,exists,not in,not exists
transformation的过程:
一个查询发起时，首先要做启发式的transformation，转化好之后再做优化，最后生成执行计划。
查询->启发式Transformation->优化->执行计划
1.启发式Transformation:
(1)其规则是硬代码写死
(2)先于cost评估
(3)剔除多余的操作
(4)最小化query block
2.基于成本的Transformation
在多个可能Transformation的路径中选择
从多个Transformation结果中找到好的plan
查询->启发式Transformation->基于成本的Transformation->优化->执行计划
例子：
set line 200
set pages 200
@10053.sql
select /*sample 1*/e.ename
from emp e, emp m
where e.mgr=m.empno
and m.deptno = 10
and e.deptno = m.deptno
and e.sal>1500
and m.sal>e.sal;
@10053d.sql
/oracle/app/diag/rdbms/prod/prod/trace/prod_ora_3937.trc
经过transformations后的最终语句:
Final query after transformations:******* UNPARSED QUERY IS *******
SELECT "E"."ENAME" "ENAME" FROM "SCOTT"."EMP" "E","SCOTT"."EMP" "M" WHERE "E"."MGR"="M"."EMPNO" AND "M"."DEPTNO"=10 AND "E"."DEPTNO"="M"."DEPTNO" AND "E"."SAL">1500 AND "M"."SAL">"E"."SAL" AND "M"."SAL">1500 AND "E"."DEPTNO"=10
10053trace文件全部内容:
Trace file /oracle/app/diag/rdbms/prod/prod/trace/prod_ora_3937.trc
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
ORACLE_HOME = /oracle/app/product/11.2.0/db_1
System name:Linux
Node name:
Release:2.6.32-642.el6.x86_64
Version:#1 SMP Tue May 10 17:27:01 UTC
Machine:x86_64
VM name:VMWare Version: 6
Instance name: prod
Redo thread mounted by this instance: 1
Oracle process number: 30
Unix process pid: 3937, image: oracle@ (TNS V1-V3)
*** -07-30 21:51:47.085
*** SESSION ID:(135.85) -07-30 21:51:47.085
*** CLIENT ID:() -07-30 21:51:47.085
*** SERVICE NAME:(SYS$USERS) -07-30 21:51:47.085
*** MODULE NAME:(SQL*Plus) -07-30 21:51:47.085
*** ACTION NAME:() -07-30 21:51:47.085
Registered qb: SEL$1 0xcceb2550 (PARSER)
---------------------
QUERY BLOCK SIGNATURE--10053第一步查询块签名认证
---------------------
signature (): qb_name=SEL$1 nbfros=2 flg=0--查询块签名
fro(0): flg=4 objn=87108 hint_alias="E"@"SEL$1"
fro(1): flg=4 objn=87108 hint_alias="M"@"SEL$1"
查询块定义：
Query Block是指一个语义上完整的查询语句，它可以是一个子查询所对应的SQL语句,也可以是一个视图所对应的视图定义语句。目标SQL可以包含一个或者多个Query Block，当目标SQL只包含一个Query block时，这个query block就是目标SQL本身。
查询块签名列出了该查询块中的表，(fro(0)),有助于我们了解查询是如何被分解为各个部分的.
SPM: statement not found in SMB--当前不存在sql plan baselines
**************************
Automatic degree of parallelism (ADOP)
**************************
Automatic degree of parallelism is disabled: Parameter.
PM: Considering predicate move-around in query block SEL$1 (#0)--考虑是否可以去除谓词，也叫过滤谓词移动
**************************
Predicate Move-Around (PM)
**************************
OPTIMIZER INFORMATION
******************************************
----- Current SQL Statement for this session (sql_id=4usswnngj0jdx)
-----当前SQL展示，未进行transformation
select /*sample 1*/e.ename
from emp e, emp m
where e.mgr=m.empno
and m.deptno = 10
and e.deptno = m.deptno
and e.sal>1500
and m.sal>e.sal
*******************************************
Legend
The following abbreviations are used by optimizer trace.--名词术语解释
CBQT - cost-based query transformation
JPPD - join predicate push-down
OJPPD - old-style (non-cost-based) JPPD
FPD - filter push-down
PM - predicate move-around
CVM - complex view merging
SPJ - select-project-join
SJC - set join conversion
SU - subquery unnesting
OBYE - order by elimination
OST - old style star transformation
ST - new (cbqt) star transformation
CNT - count(col) to count(*) transformation
JE - Join Elimination
JF - join factorization
CBY - connect by
SLP - select list pruning
DP - distinct placement
qb - query block
LB - leaf blocks
DK - distinct keys
LB/K - average number of leaf blocks per key
DB/K - average number of data blocks per key
CLUF - clustering factor
NDV - number of distinct values
Resp - response cost
Card - cardinality
Resc - resource cost
NL - nested loops (join)
SM - sort merge (join)
HA - hash (join)
CPUSPEED - CPU Speed
IOTFRSPEED - I/O transfer speed
IOSEEKTIM - I/O seek time
SREADTIM - average single block read time
MREADTIM - average multiblock read time
MBRC - average multiblock read count
MAXTHR - maximum I/O system throughput
SLAVETHR - average slave I/O throughput
dmeth - distribution method
1: no partitioning required
2: value partitioned
4: right is random (round-robin)
128: left is random (round-robin)
8: broadcast right and partition left
16: broadcast left and partition right
32: partition left using partitioning of right
64: partition right using partitioning of left
256: run the join in serial
0: invalid distribution method
sel - selectivity
ptn - partition
***************************************
PARAMETERS USED BY THE OPTIMIZER
********************************
*************************************
PARAMETERS WITH ALTERED VALUES
当前环境被修改的优化器相关参数，
如果存在相关优化器参数被修改，会被此处列出，sqlt时重点看
******************************
Compilation Environment Dump
Bug Fix Control Environment
*************************************
PARAMETERS WITH DEFAULT VALUES--所有与CBO相关参数列示.
******************************
Compilation Environment Dump
optimizer_mode_hinted= false
optimizer_features_hinted= 0.0.0
parallel_execution_enabled= true
parallel_query_forced_dop= 0
parallel_dml_forced_dop= 0
parallel_ddl_forced_degree= 0
parallel_ddl_forced_instances= 0
_query_rewrite_fudge= 90
optimizer_features_enable= 11.2.0.4
_optimizer_search_limit= 5
cpu_count= 4
active_instance_count= 1
parallel_threads_per_cpu= 2
hash_area_size= 131072
bitmap_merge_area_size= 1048576
sort_area_size= 65536
sort_area_retained_size= 0
_sort_elimination_cost_ratio= 0
_optimizer_block_size= 8192
_sort_multiblock_read_count= 2
_hash_multiblock_io_count= 0
_db_file_optimizer_read_count= 8
_optimizer_max_permutations= 2000
pga_aggregate_target= 204800 KB
_pga_max_size= 204800 KB
_query_rewrite_maxdisjunct= 257
_smm_auto_min_io_size= 56 KB
_smm_auto_max_io_size= 248 KB
_smm_min_size= 204 KB
_smm_max_size_static= 40960 KB
_smm_px_max_size_static= 102400 KB
_cpu_to_io= 0
_optimizer_undo_cost_change= 11.2.0.4
parallel_query_mode= enabled
parallel_dml_mode= disabled
parallel_ddl_mode= enabled
optimizer_mode= all_rows
sqlstat_enabled= false
_optimizer_percent_parallel= 101
_always_anti_join= choose
_always_semi_join= choose
_optimizer_mode_force= true
_partition_view_enabled= true
_always_star_transformation= false
_query_rewrite_or_error= false
_hash_join_enabled= true
cursor_sharing= exact
_b_tree_bitmap_plans= true
star_transformation_enabled= false
_optimizer_cost_model= choose
_new_sort_cost_estimate= true
_complex_view_merging= true
_unnest_subquery= true
_eliminate_common_subexpr= true
_pred_move_around= true
_convert_set_to_join= false
_push_join_predicate= true
_push_join_union_view= true
_fast_full_scan_enabled= true
_optim_enhance_nnull_detection= true
_parallel_broadcast_enabled= true
_px_broadcast_fudge_factor= 100
_ordered_nested_loop= true
_no_or_expansion= false
optimizer_index_cost_adj= 100
optimizer_index_caching= 0
_system_index_caching= 0
_disable_datalayer_sampling= false
query_rewrite_enabled= true
query_rewrite_integrity= enforced
_query_cost_rewrite= true
_query_rewrite_2= true
_query_rewrite_1= true
_query_rewrite_expression= true
_query_rewrite_jgmigrate= true
_query_rewrite_fpc= true
_query_rewrite_drj= true
_full_pwise_join_enabled= true
_partial_pwise_join_enabled= true
_left_nested_loops_random= true
_improved_row_length_enabled= true
_index_join_enabled= true
_enable_type_dep_selectivity= true
_improved_outerjoin_card= true
_optimizer_adjust_for_nulls= true
_optimizer_degree= 0
_use_column_stats_for_function= true
_subquery_pruning_enabled= true
_subquery_pruning_mv_enabled= false
_or_expand_nvl_predicate= true
_like_with_bind_as_equality= false
_table_scan_cost_plus_one= true
_cost_equality_semi_join= true
_default_non_equality_sel_check= true
_new_initial_join_orders= true
_oneside_colstat_for_equijoins= true
_optim_peek_user_binds= true
_minimal_stats_aggregation= true
_force_temptables_for_gsets= false
workarea_size_policy= auto
_smm_auto_cost_enabled= true
_gs_anti_semi_join_allowed= true
_optim_new_default_join_sel= true
optimizer_dynamic_sampling= 2
_pre_rewrite_push_pred= true
_optimizer_new_join_card_computation = true
_union_rewrite_for_gs= yes_gset_mvs
_generalized_pruning_enabled= true
_optim_adjust_for_part_skews= true
_force_datefold_trunc= false
statistics_level= typical
_optimizer_system_stats_usage= true
skip_unusable_indexes= true
_remove_aggr_subquery= true
_optimizer_push_down_distinct= 0
_dml_monitoring_enabled= true
_optimizer_undo_changes= false
_predicate_elimination_enabled= true
_nested_loop_fudge= 100
_project_view_columns= true
_local_communication_costing_enabled = true
_local_communication_ratio= 50
_query_rewrite_vop_cleanup= true
_slave_mapping_enabled= true
_optimizer_cost_based_transformation = linear
_optimizer_mjc_enabled= true
_right_outer_hash_enable= true
_spr_push_pred_refspr= true
_optimizer_cache_stats= false
_optimizer_cbqt_factor= 50
_optimizer_squ_bottomup= true
_fic_area_size= 131072
_optimizer_skip_scan_enabled= true
_optimizer_cost_filter_pred= false
_optimizer_sortmerge_join_enabled= true
_optimizer_join_sel_sanity_check= true
_mmv_query_rewrite_enabled= true
_bt_mmv_query_rewrite_enabled= true
_add_stale_mv_to_dependency_list= true
_distinct_view_unnesting= false
_optimizer_dim_subq_join_sel= true
_optimizer_disable_strans_sanity_checks = 0
_optimizer_compute_index_stats= true
_push_join_union_view2= true
_optimizer_ignore_hints= false
_optimizer_random_plan= 0
_query_rewrite_setopgrw_enable= true
_optimizer_correct_sq_selectivity= true
_disable_function_based_index= false
_optimizer_join_order_control= 3
_optimizer_cartesian_enabled= true
_optimizer_starplan_enabled= true
_extended_pruning_enabled= true
_optimizer_push_pred_cost_based= true
_optimizer_null_aware_antijoin= true
_optimizer_extend_jppd_view_types= true
_sql_model_unfold_forloops= run_time
_enable_dml_lock_escalation= false
_bloom_filter_enabled= true
_update_bji_ipdml_enabled= 0
_optimizer_extended_cursor_sharing= udo
_dm_max_shared_pool_pct= 1
_optimizer_cost_hjsmj_multimatch= true
_optimizer_transitivity_retain= true
_px_pwg_enabled= true
optimizer_secure_view_merging= true
_optimizer_join_elimination_enabled = true
flashback_table_rpi= non_fbt
_optimizer_cbqt_no_size_restriction = true
_optimizer_enhanced_filter_push= true
_optimizer_filter_pred_pullup= true
_rowsrc_trace_level= 0
_simple_view_merging= true
_optimizer_rownum_pred_based_fkr= true
_optimizer_better_inlist_costing= all
_optimizer_self_induced_cache_cost= false
_optimizer_min_cache_blocks= 10
_optimizer_or_expansion= depth
_optimizer_order_by_elimination_enabled = true
_optimizer_outer_to_anti_enabled= true
_selfjoin_mv_duplicates= true
_dimension_skip_null= true
_force_rewrite_enable= false
_optimizer_star_tran_in_with_clause = true
_optimizer_complex_pred_selectivity = true
_optimizer_connect_by_cost_based= true
_gby_hash_aggregation_enabled= true
_globalindex_pnum_filter_enabled= true
_px_minus_intersect= true
_fix_control_key= 0
_force_slave_mapping_intra_part_loads = false
_force_tmp_segment_loads= false
_query_mmvrewrite_maxpreds= 10
_query_mmvrewrite_maxintervals= 5
_query_mmvrewrite_maxinlists= 5
_query_mmvrewrite_maxdmaps= 10
_query_mmvrewrite_maxcmaps= 20
_query_mmvrewrite_maxregperm= 512
_query_mmvrewrite_maxqryinlistvals= 500
_disable_parallel_conventional_load = false
_trace_virtual_columns= false
_replace_virtual_columns= true
_virtual_column_overload_allowed= true
_kdt_buffering= true
_first_k_rows_dynamic_proration= true
_optimizer_sortmerge_join_inequality = true
_optimizer_aw_stats_enabled= true
_bloom_pruning_enabled= true
result_cache_mode= MANUAL
_px_ual_serial_input= true
_optimizer_skip_scan_guess= false
_enable_row_shipping= true
_row_shipping_threshold= 80
_row_shipping_explain= false
transaction_isolation_level= read_commited
_optimizer_distinct_elimination= true
_optimizer_multi_level_push_pred= true
_optimizer_group_by_placement= true
_optimizer_rownum_bind_default= 10
_enable_query_rewrite_on_remote_objs = true
_optimizer_extended_cursor_sharing_rel = simple
_optimizer_adaptive_cursor_sharing= true
_direct_path_insert_features= 0
_optimizer_improve_selectivity= true
optimizer_use_pending_statistics= false
_optimizer_enable_density_improvements = true
_optimizer_aw_join_push_enabled= true
_optimizer_connect_by_combine_sw= true
_enable_pmo_ctas= 0
_optimizer_native_full_outer_join= force
_bloom_predicate_enabled= true
_optimizer_enable_extended_stats= true
_is_lock_table_for_ddl_wait_lock= 0
_pivot_implementation_method= choose
optimizer_capture_sql_plan_baselines = false
optimizer_use_sql_plan_baselines= true
_optimizer_star_trans_min_cost= 0
_optimizer_star_trans_min_ratio= 0
_with_subquery= OPTIMIZER
_optimizer_fkr_index_cost_bias= 10
_optimizer_use_subheap= true
parallel_degree_policy= manual
parallel_degree= 0
parallel_min_time_threshold= 10
_parallel_time_unit= 10
_optimizer_or_expansion_subheap= true
_optimizer_free_transformation_heap = true
_optimizer_reuse_cost_annotations= true
_result_cache_auto_size_threshold= 100
_result_cache_auto_time_threshold= 1000
_optimizer_nested_rollup_for_gset= 100
_nlj_batching_enabled= 1
parallel_query_default_dop= 0
is_recur_flags= 0
optimizer_use_invisible_indexes= false
flashback_data_archive_internal_cursor = 0
_optimizer_extended_stats_usage_control = 192
_parallel_syspls_obey_force= true
cell_offload_processing= true
_rdbms_internal_fplib_enabled= false
db_file_multiblock_read_count= 128
_bloom_folding_enabled= true
_mv_generalized_oj_refresh_opt= true
cell_offload_compaction= ADAPTIVE
cell_offload_plan_display= AUTO
_bloom_predicate_pushdown_to_storage = true
_bloom_vector_elements= 0
_bloom_pushing_max= 512
parallel_degree_limit= 65535
parallel_force_local= false
parallel_max_degree= 8
total_cpu_count= 4
_optimizer_coalesce_subqueries= true
_optimizer_fast_pred_transitivity= true
_optimizer_fast_access_pred_analysis = true
_optimizer_unnest_disjunctive_subq= true
_optimizer_unnest_corr_set_subq= true
_optimizer_distinct_agg_transform= true
_aggregation_optimization_settings= 0
_optimizer_connect_by_elim_dups= true
_optimizer_eliminate_filtering_join = true
_connect_by_use_union_all= true
dst_upgrade_insert_conv= true
advanced_queuing_internal_cursor= 0
_optimizer_unnest_all_subqueries= true
parallel_autodop= 0
parallel_ddldml= 0
_parallel_cluster_cache_policy= adaptive
_parallel_scalability= 50
iot_internal_cursor= 0
_optimizer_instance_count= 0
_optimizer_connect_by_cb_whr_only= false
_suppress_scn_chk_for_cqn= nosuppress_1466
_optimizer_join_factorization= true
_optimizer_use_cbqt_star_transformation = true
_optimizer_table_expansion= true
_and_pruning_enabled= true
_deferred_constant_folding_mode= DEFAULT
_optimizer_distinct_placement= true
partition_pruning_internal_cursor= 0
parallel_hinted= none
_sql_compatibility= 0
_optimizer_use_feedback= true
_optimizer_try_st_before_jppd= true
_dml_frequency_tracking= false
_optimizer_interleave_jppd= true
kkb_drop_empty_segments= 0
_px_partition_scan_enabled= true
_px_partition_scan_threshold= 64
_optimizer_false_filter_pred_pullup = true
_bloom_minmax_enabled= true
only_move_row= 0
_optimizer_enable_table_lookup_by_nl = true
deferred_segment_creation= true
_optimizer_filter_pushdown= true
_allow_level_without_connect_by= false
_max_rwgs_groupings= 8192
_optimizer_outer_join_to_inner= true
_optimizer_full_outer_join_to_outer = true
_px_numa_support_enabled= true
total_processor_group_count= 1
_bloom_sm_enabled= false
_bloom_serial_filter= on
_parallel_degree_level= 100
_optimizer_ads_max_table_count= 0
_optimizer_ads_time_limit= 0
_optimizer_ads_use_result_cache= true
parallel_dblink= 0
_optimizer_cluster_by_rowid= false
_optimizer_cluster_by_rowid_control = 3
Bug Fix Control Environment--当前环境Bug Fix，可根据Bug号去Mos匹配，可手动关掉
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***************************************
PARAMETERS IN OPT_PARAM HINT
****************************
***************************************
Column Usage Monitoring is ON: tracking level = 1
***************************************
Considering Query Transformations on query block SEL$1 (#0)
**************************
Query trrmations (QT)--Oracle进行查询转换流程判断
JF: Checking validity of join factorization for query block SEL$1 (#0)
JF: Bypassed: not a UNION or UNION-ALL query block. --不存在union，union all 跳过
ST: not valid since star transformation parameter is FALSE --星型转换跳过
TE: Checking validity of table expansion for query block SEL$1 (#0)
TE: Bypassed: No partitioned table in query block. --没有分区表跳过
CBQT bypassed for query block SEL$1 (#0): no complex view, sub-queries or UNION (ALL) queries.--不是复杂视图跳过
CBQT: Validity checks failed for 4usswnngj0jdx.
CSE: Considering common sub-expression elimination in query block SEL$1 (#0)
*************************
Common Subexpression elimination (CSE)
*************************
CSE:CSE not performed on query block SEL$1 (#0).
OBYE:Considering Order-by Elimination from view SEL$1 (#0)
***************************
Order-by elimination (OBYE)
***************************
OBYE:OBYE bypassed: no order by to eliminate.
JE:Considering Join Elimination on query block SEL$1 (#0)--考虑消除Join
*************************
Join Elimination (JE)
*************************
SQL:******* UNPARSED QUERY IS *******
SELECT "E"."ENAME" "ENAME" FROM "SCOTT"."EMP" "E","SCOTT"."EMP" "M" WHERE "E"."MGR"="M"."EMPNO" AND "M"."DEPTNO"=10 AND "E"."DEPTNO"="M"."DEPTNO" AND "E"."SAL">1500 AND "M"."SAL">"E"."SAL"
JE:cfro: EMP objn:87108 col#:4 dfro:EMP dcol#:1
JE:cfro: EMP objn:87108 col#:8 dfro:EMP dcol#:8
JE:cfro: EMP objn:87108 col#:8 dfro:EMP dcol#:8
JE:cfro: EMP objn:87108 col#:1 dfro:EMP dcol#:4
JE:cfro: EMP objn:87108 col#:8 dfro:EMP dcol#:8
SQL:******* UNPARSED QUERY IS *******
SELECT "E"."ENAME" "ENAME" FROM "SCOTT"."EMP" "E","SCOTT"."EMP" "M" WHERE "E"."MGR"="M"."EMPNO" AND "M"."DEPTNO"=10 AND "E"."DEPTNO"="M"."DEPTNO" AND "E"."SAL">1500 AND "M"."SAL">"E"."SAL"
Query block SEL$1 (#0) unchanged
CVM: Considering view merge in query block SEL$1 (#0)
OJE: Begin: find best directive for query block SEL$1 (#0)
OJE: End: finding best directive for query block SEL$1 (#0)
JE:Considering Join Elimination on query block SEL$1 (#0)
*************************
Join Elimination (JE)
*************************
SQL:******* UNPARSED QUERY IS *******
SELECT "E"."ENAME" "ENAME" FROM "SCOTT"."EMP" "E","SCOTT"."EMP" "M" WHERE "E"."MGR"="M"."EMPNO" AND "M"."DEPTNO"=10 AND "E"."DEPTNO"="M"."DEPTNO" AND "E"."SAL">1500 AND "M"."SAL">"E"."SAL"
JE:cfro: EMP objn:87108 col#:4 dfro:EMP dcol#:1
JE:cfro: EMP objn:87108 col#:8 dfro:EMP dcol#:8
JE:cfro: EMP objn:87108 col#:8 dfro:EMP dcol#:8
JE:cfro: EMP objn:87108 col#:1 dfro:EMP dcol#:4
JE:cfro: EMP objn:87108 col#:8 dfro:EMP dcol#:8
SQL:******* UNPARSED QUERY IS *******
SELECT "E"."ENAME" "ENAME" FROM "SCOTT"."EMP" "E","SCOTT"."EMP" "M" WHERE "E"."MGR"="M"."EMPNO" AND "M"."DEPTNO"=10 AND "E"."DEPTNO"="M"."DEPTNO" AND "E"."SAL">1500 AND "M"."SAL">"E"."SAL"
Query block SEL$1 (#0) unchanged
query block SEL$1 (#0) unchanged
Considering Query Transformations on query block SEL$1 (#0)
**************************
Query transformations (QT)
**************************
JF: Checking validity of join factorization for query block SEL$1 (#0)
JF: Bypassed: not a UNION or UNION-ALL query block.
ST: not valid since star transformation parameter is FALSE
TE: Checking validity of table expansion for query block SEL$1 (#0)
TE: Bypassed: No partitioned table in query block.
CBQT bypassed for query block SEL$1 (#0): no complex view, sub-queries or UNION (ALL) queries.
CBQT: Validity checks failed for 4usswnngj0jdx.
CSE: Considering common sub-expression elimination in query block SEL$1 (#0)
*************************
Common Subexpression elimination (CSE)
*************************
CSE:CSE not performed on query block SEL$1 (#0).
SU: Considering subquery unnesting in query block SEL$1 (#0)
********************
Subquery Unnest (SU)
********************
SJC: Considering set-join conversion in query block SEL$1 (#0)
*************************
Set-Join Conversion (SJC)
*************************
SJC: not performed
JE:Considering Join Elimination on query block SEL$1 (#0)
*************************
Join Elimination (JE)
*************************
SQL:******* UNPARSED QUERY IS *******
SELECT "E"."ENAME" "ENAME" FROM "SCOTT"."EMP" "E","SCOTT"."EMP" "M" WHERE "E"."MGR"="M"."EMPNO" AND "M"."DEPTNO"=10 AND "E"."DEPTNO"="M"."DEPTNO" AND "E"."SAL">1500 AND "M"."SAL">"E"."SAL"
JE:cfro: EMP objn:87108 col#:4 dfro:EMP dcol#:1
JE:cfro: EMP objn:87108 col#:8 dfro:EMP dcol#:8
JE:cfro: EMP objn:87108 col#:8 dfro:EMP dcol#:8
JE:cfro: EMP objn:87108 col#:1 dfro:EMP dcol#:4
JE:cfro: EMP objn:87108 col#:8 dfro:EMP dcol#:8
SQL:******* UNPARSED QUERY IS *******
SELECT "E"."ENAME" "ENAME" FROM "SCOTT"."EMP" "E","SCOTT"."EMP" "M" WHERE "E"."MGR"="M"."EMPNO" AND "M"."DEPTNO"=10 AND "E"."DEPTNO"="M"."DEPTNO" AND "E"."SAL">1500 AND "M"."SAL">"E"."SAL"
Query block SEL$1 (#0) unchanged
PM: Considering predicate move-around in query block SEL$1 (#0)
**************************
Predicate Move-Around (PM)
**************************
PM:PM bypassed: Outer query contains no views.
PM:PM bypassed: Outer query contains no views.
query block SEL$1 (#0) unchanged
FPD: Considering simple filter push in query block SEL$1 (#0)
"E"."MGR"="M"."EMPNO" AND "M"."DEPTNO"=10 AND "E"."DEPTNO"="M"."DEPTNO" AND "E"."SAL">1500 AND "M"."SAL">"E"."SAL"
try to generate transitive predicate from check constraints for query block SEL$1 (#0)
finally:"E"."MGR"="M"."EMPNO" AND "M"."DEPTNO"=10 AND "E"."DEPTNO"="M"."DEPTNO" AND "E"."SAL">1500 AND "M"."SAL">"E"."SAL" AND "M"."SAL">1500 AND "E"."DEPTNO"=10
FPD:transitive predicates are generated in query block SEL$1 (#0)--产生了可传递谓词
"E"."MGR"="M"."EMPNO" AND "M"."DEPTNO"=10 AND "E"."DEPTNO"="M"."DEPTNO" AND "E"."SAL">1500 AND "M"."SAL">"E"."SAL" AND "M"."SAL">1500 AND "E"."DEPTNO"=10
apadrv-start sqlid=5576332259131147709
:
call(in-use=3888, alloc=16344), compile(in-use=76512, alloc=79360), execution(in-use=3336, alloc=4032)
*******************************************
Peeked values of the binds in SQL statement
*******************************************
Final query after transformations:******* UNPARSED QUERY IS *******
SELECT "E"."ENAME" "ENAME" FROM "SCOTT"."EMP" "E","SCOTT"."EMP" "M" WHERE "E"."MGR"="M"."EMPNO" AND "M"."DEPTNO"=10 AND "E"."DEPTNO"="M"."DEPTNO" AND "E"."SAL">1500 AND "M"."SAL">"E"."SAL" AND "M"."SAL">1500 AND "E"."DEPTNO"=10--经过transformations后的最终语句
kkoqbc: optimizing query block SEL$1 (#0)
:
call(in-use=4232, alloc=16344), compile(in-use=77800, alloc=79360), execution(in-use=3336, alloc=4032)
kkoqbc-subheap (create addr=0x7fadccebfa10)
****************
QUERY BLOCK TEXT
****************
select /*sample 1*/e.ename
from emp e, emp m
where e.mgr=m.empno
and m.deptno = 10
and e.deptno = m.deptno
and e.sal>1500
and m.sal>e.sal
---------------------
QUERY BLOCK SIGNATURE
---------------------
signature (optimizer): qb_name=SEL$1 nbfros=2 flg=0
fro(0): flg=0 objn=87108 hint_alias="E"@"SEL$1"
fro(1): flg=0 objn=87108 hint_alias="M"@"SEL$1"
-----------------------------
SYSTEM STATISTICS INFORMATION--系统统计信息
-----------------------------
Using NOWORKLOAD Stats
CPUSPEEDNW: 3074 millions instructions/sec (default is 100)
IOTFRSPEED: 4096 bytes per millisecond (default is 4096)
IOSEEKTIM:10 milliseconds (default is 10)
MBRC:NO VALUE blocks (default is 8)
***************************************
BASE STATISTICAL INFORMATION--表，列，索引相关统计信息。
***********************
Table Stats::
Table: EMPAlias:M
#Rows: 14#Blks:5AvgRowLen:38.00ChainCnt:0.00
--表统计信息 Rows->num_rows / Blks ->num_block /AvgRowLen平均行长 / ChainCnt行链接
Column (#1): EMPNO(
--Column(#1) 列出涉及查询的列
AvgLen: 4 NDV: 14 Nulls: 0 Density: 0.071429 Min: 7369 Max: 7934
--列统计信息AvgLen：平均长度 / NDV：唯一值 在没有直方图的情况下NDV=1/density / Nulls：空值数量 / Density：密度 / Min：最大值 high value/ Max：最小值 low value
--Column (#1): EMPNO该列没有直方图信息
Column (#8): DEPTNO(
AvgLen: 3 NDV: 3 Nulls: 0 Density: 0.107143 Min: 10 Max: 30
Histogram: HtBal#Bkts: 14UncompBkts: 14EndPtVals: 3 --直方图为highbalance
Index Stats::
Index: PK_EMPCol#: 1
LVLS: 0#LB: 1#DK: 14LB/K: 1.00DB/K: 1.00CLUF: 1.00
***********************
Table Stats::
Table: EMPAlias:E
#Rows: 14#Blks:5AvgRowLen:38.00ChainCnt:0.00
Column (#4): MGR(
AvgLen: 4 NDV: 6 Nulls: 1 Density: 0.166667 Min: 7566 Max: 7902
Column (#8): DEPTNO(
AvgLen: 3 NDV: 3 Nulls: 0 Density: 0.107143 Min: 10 Max: 30
Histogram: HtBal#Bkts: 14UncompBkts: 14EndPtVals: 3
Index Stats::
Index: PK_EMPCol#: 1
LVLS: 0#LB: 1#DK: 14LB/K: 1.00DB/K: 1.00CLUF: 1.00
Access path analysis for EMP--表的访问路径成本分析
***************************************
SINGLE TABLE ACCESS PATH
Single Table Cardinality Estimation for EMP[E]--分析如何访问单表E是最快的。
Column (#6):
NewDensity:0.035714, OldDensity:0.035714 BktCnt:14, PopBktCnt:4, PopValCnt:2, NDV:12
Column (#6): SAL(
AvgLen: 4 NDV: 12 Nulls: 0 Density: 0.035714 Min: 800 Max: 5000
Histogram: Freq#Bkts: 12UncompBkts: 14EndPtVals: 12
Table: EMPAlias: E
Card: Original: 14.000000Rounded: 1Computed: 1.39Non Adjusted: 1.39
Access Path:TableScan
Cost:3.00Resp: 3.00Degree: 0
Cost_io: 3.00Cost_cpu: 40547
Resp_io: 3.00Resp_cpu: 40547
Best:: AccessPath: TableScan
Cost: 3.00Degree: 1Resp: 3.00Card: 1.39Bytes: 0
Access path analysis for EMP
***************************************
SINGLE TABLE ACCESS PATH
Single Table Cardinality Estimation for EMP[M]--分析如何访问单表M是最快的。
Column (#6):
NewDensity:0.035714, OldDensity:0.035714 BktCnt:14, PopBktCnt:4, PopValCnt:2, NDV:12
Column (#6): SAL(
AvgLen: 4 NDV: 12 Nulls: 0 Density: 0.035714 Min: 800 Max: 5000
Histogram: Freq#Bkts: 12UncompBkts: 14EndPtVals: 12
Table: EMPAlias: M
Card: Original: 14.000000Rounded: 2Computed: 1.50Non Adjusted: 1.50
Access Path:TableScan
Cost:3.00Resp: 3.00Degree: 0
Cost_io: 3.00Cost_cpu: 40517
Resp_io: 3.00Resp_cpu: 40517
Best:: AccessPath: TableScan
Cost: 3.00Degree: 1Resp: 3.00Card: 1.50Bytes: 0
***************************************
OPTIMIZER STATISTICS AND COMPUTATIONS
***************************************
GENERAL PLANS
***************************************
Considering cardinality-based initial join order.--考虑表连接方式
Permutations for Starting Table :0
Join order[1]:EMP[E]#0 EMP[M]#1 --E为驱动表M为被驱动表
***************
Now joining: EMP[M]#1--EMP[M]为被驱动表cost计算
***************
NL Join
Outer table: Card: 1.39Cost: 3.00Resp: 3.00Degree: 1Bytes: 17
Access path analysis for EMP
Inner table: EMPAlias: M
Access Path: TableScan
NL Join:Cost: 6.00Resp: 6.00Degree: 1
Cost_io: 6.00Cost_cpu: 81064
Resp_io: 6.00Resp_cpu: 81064
Access Path: index (UniqueScan)
Index: PK_EMP
resc_io: 1.00resc_cpu: 8522
ix_sel: 0.071429ix_sel_with_filters: 0.071429
NL Join : Cost: 4.00Resp: 4.00Degree: 1
Cost_io: 4.00Cost_cpu: 49069
Resp_io: 4.00Resp_cpu: 49069
Access Path: index (AllEqUnique)
Index: PK_EMP
resc_io: 1.00resc_cpu: 8522
ix_sel: 0.071429ix_sel_with_filters: 0.071429
NL Join : Cost: 4.00Resp: 4.00Degree: 1
Cost_io: 4.00Cost_cpu: 49069
Resp_io: 4.00Resp_cpu: 49069
Best NL cost:4.00--NL连接成本
resc: 4.00resc_io: 4.00resc_cpu: 49069
resp: 4.00resp_io: 4.00resc_cpu: 49069
Join Card:0.158279 = outer (1.392857) * inner (1.500000) * sel (0.075758)
Join cardinality for HJ/SMJ (no post filters):0.348214, outer: 1.392857, inner: 1.500000, sel: 0.075758
Join Card - Rounded: 1 Computed: 0.16
Outer table:EMPAlias: E
resc: 3.00card 1.39bytes: 17deg: 1resp: 3.00
Inner table:EMPAlias: M
resc: 3.00card: 1.50bytes: 11deg: 1resp: 3.00
using dmeth: 2#groups: 1
SORT ressourceSort statistics
Sort width:238 Area size:208896 Max Area size:41943040
Degree:1
Blocks to Sort: 1 Row size:29 Total Rows:1
Initial runs:1 Merge passes:0 IO Cost / pass:0
Total IO sort cost: 0Total CPU sort cost: 36888889
Total Temp space used: 0
SORT ressourceSort statistics
Sort width:238 Area size:208896 Max Area size:41943040
Degree:1
Blocks to Sort: 1 Row size:23 Total Rows:2
Initial runs:1 Merge passes:0 IO Cost / pass:0
Total IO sort cost: 0Total CPU sort cost: 36888979
Total Temp space used: 0
SM join: Resc: 8.00Resp: 8.00[multiMatchCost=0.00]
SM Join
SM cost: 8.00--SM Join连接成本
resc: 8.00 resc_io: 6.00 resc_cpu: 73858932
resp: 8.00 resp_io: 6.00 resp_cpu: 73858932
Outer table:EMPAlias: E
resc: 3.00card 1.39bytes: 17deg: 1resp: 3.00
Inner table:EMPAlias: M
resc: 3.00card: 1.50bytes: 11deg: 1resp: 3.00
using dmeth: 2#groups: 1
Cost per ptn: 0.02#ptns: 1
hash_area: 124 (max=10240) buildfrag: 1probefrag: 1ppasses: 1
Hash join: Resc: 6.02Resp: 6.02[multiMatchCost=0.00]
HA Join
HA cost: 6.02--hash join连接成本
resc: 6.02 resc_io: 6.00 resc_cpu: 681414
resp: 6.02 resp_io: 6.00 resp_cpu: 681414
Best:: JoinMethod: NestedLoop
Cost: 4.00Degree: 1Resp: 4.00Card: 0.16 Bytes: 28
***********************
Best so far:Table#: 0cost: 3.0011card: 1.3929bytes: 17
Table#: 1cost: 4.0013card: 0.1583bytes: 28
***********************
Join order[2]:EMP[M]#1EMP[E]#0 --反向Join
***************
Now joining: EMP[E]#0
***************
NL Join
Outer table: Card: 1.50Cost: 3.00Resp: 3.00Degree: 1Bytes: 11
Access path analysis for EMP
Inner table: EMPAlias: E
Access Path: TableScan
NL Join:Cost: 7.00Resp: 7.00Degree: 1
Cost_io: 7.00Cost_cpu: 121612
Resp_io: 7.00Resp_cpu: 121612
Best NL cost: 7.00--NL连接成本
resc: 7.00resc_io: 7.00resc_cpu: 121612
resp: 7.00resp_io: 7.00resc_cpu: 121612
Join Card:0.158279 = outer (1.500000) * inner (1.392857) * sel (0.075758)
Join cardinality for HJ/SMJ (no post filters):0.348214, outer: 1.500000, inner: 1.392857, sel: 0.075758
Join Card - Rounded: 1 Computed: 0.16
Outer table:EMPAlias: M
resc: 3.00card 1.50bytes: 11deg: 1resp: 3.00
Inner table:EMPAlias: E
resc: 3.00card: 1.39bytes: 17deg: 1resp: 3.00
using dmeth: 2#groups: 1
SORT ressourceSort statistics
Sort width:238 Area size:208896 Max Area size:41943040
Degree:1
Blocks to Sort: 1 Row size:23 Total Rows:2
Initial runs:1 Merge passes:0 IO Cost / pass:0
Total IO sort cost: 0Total CPU sort cost: 36888979
Total Temp space used: 0
SORT ressourceSort statistics
Sort width:238 Area size:208896 Max Area size:41943040
Degree:1
Blocks to Sort: 1 Row size:29 Total Rows:1
Initial runs:1 Merge passes:0 IO Cost / pass:0
Total IO sort cost: 0Total CPU sort cost: 36888889
Total Temp space used: 0
SM join: Resc: 8.00Resp: 8.00[multiMatchCost=0.00]
SM Join
SM cost: 8.00--SM Join连接成本
resc: 8.00 resc_io: 6.00 resc_cpu: 73858932
resp: 8.00 resp_io: 6.00 resp_cpu: 73858932
Outer table:EMPAlias: M
resc: 3.00card 1.50bytes: 11deg: 1resp: 3.00
Inner table:EMPAlias: E
resc: 3.00card: 1.39bytes: 17deg: 1resp: 3.00
using dmeth: 2#groups: 1
Cost per ptn: 0.02#ptns: 1
hash_area: 124 (max=10240) buildfrag: 1probefrag: 1ppasses: 1
Hash join: Resc: 6.02Resp: 6.02[multiMatchCost=0.00]
HA Join
HA cost: 6.02--Hash Join连接成本
resc: 6.02 resc_io: 6.00 resc_cpu: 681464
resp: 6.02 resp_io: 6.00 resp_cpu: 681464
Join order aborted: cost > best plan cost
***********************
(newjo-stop-1) k:0, spcnt:0, perm:2, maxperm:2000
*********************************
Number of join permutations tried: 2
*********************************
Consider using bloom filter between E[EMP] and M[EMP] with ??
kkoBloomFilter: join ndv:0 reduction:1.000000 (limit:0.500000)rejected because not a hash join
Enumerating distribution method (advanced)
--- Distribution method for
join between E[EMP](serial) and M[EMP](serial); jm = 12; right side access path = IndexUnique
---- NLJ default -> BROADCAST-LEFT
(newjo-save)[1 0 ]
Trying or-Expansion on query block SEL$1 (#0)
Transfer Optimizer annotations for query block SEL$1 (#0)
id=0 frofand predicate="E"."DEPTNO"=10 AND "E"."SAL">1500 AND "E"."MGR" IS NOT NULL
id=0 frofkks[i] (index start key) predicate="E"."MGR"="M"."EMPNO"
id=0 frofkke[i] (index stop key) predicate="E"."MGR"="M"."EMPNO"
id=0 frofand predicate="M"."DEPTNO"=10 AND "M"."SAL">1500 AND "M"."SAL">"E"."SAL"
Final cost for query block SEL$1 (#0) - All Rows Plan:
Best join order: 1
Cost: 4.0013Degree: 1Card: 1.0000Bytes: 28
Resc: 4.0013Resc_io: 4.0000Resc_cpu: 49069
Resp: 4.0013Resp_io: 4.0000Resc_cpu: 49069
kkoqbc-subheap (delete addr=0x7fadccebfa10, in-use=45504, alloc=49272)
kkoqbc-end:
:
call(in-use=14008, alloc=82128), compile(in-use=92984, alloc=94248), execution(in-use=3336, alloc=4032)
kkoqbc: finish optimizing query block SEL$1 (#0)
apadrv-end
:
call(in-use=14008, alloc=82128), compile(in-use=93968, alloc=94248), execution(in-use=3336, alloc=4032)
CBRID: M @ SEL$1 NLJBatching allocation - Failure - : disabled by parameter
CBRID: M @ SEL$1 TableLookup allocation - Failure - : disabled by parameter
Starting SQL statement dump
user_id=83 user_name=SCOTT module=SQL*Plus action=
sql_id=4usswnngj0jdx plan_hash_value=-939914904 problem_type=3
----- Current SQL Statement for this session (sql_id=4usswnngj0jdx) -----
select /*sample 1*/e.ename
from emp e, emp m
where e.mgr=m.empno
and m.deptno = 10
and e.deptno = m.deptno
and e.sal>1500
and m.sal>e.sal
sql_text_length=138
sql=select /*sample 1*/e.ename
from emp e, emp m
where e.mgr=m.empno
and m.deptno = 10
and e.deptno = m.deptno
and e.sal>1500
and m.sal>e.sal
----- Explain Plan Dump -----
----- Plan Table -----
============
Plan Table
============
------------------------------------------------+-----------------------------------+
| Id| Operation| Name| Rows| Bytes | Cost| Time|
------------------------------------------------+-----------------------------------+
| 0| SELECT STATEMENT||||4 ||
| 1|NESTED LOOPS||1 |28 |4 |00:00:01 |
| 2|NESTED LOOPS||1 |28 |4 |00:00:01 |
| 3|TABLE ACCESS FULL| EMP|1 |17 |3 |00:00:01 |
| 4|INDEX UNIQUE SCAN| PK_EMP|1 ||0 ||
| 5|TABLE ACCESS BY INDEX ROWID | EMP|1 |11 |1 |00:00:01 |
------------------------------------------------+-----------------------------------+
Predicate Information:
----------------------
3 - filter(("E"."DEPTNO"=10 AND "E"."SAL">1500 AND "E"."MGR" IS NOT NULL))
4 - access("E"."MGR"="M"."EMPNO")
5 - filter(("M"."DEPTNO"=10 AND "M"."SAL">1500 AND "M"."SAL">"E"."SAL"))
Content of other_xml column
===========================
db_version: 11.2.0.4
parse_schema: SCOTT
plan_hash: 3355052392
plan_hash_2: 3958047811
Outline Data: --一般可以用outline data固定执行计划
/*+
BEGIN_OUTLINE_DATA
IGNORE_OPTIM_EMBEDDED_HINTS
OPTIMIZER_FEATURES_ENABLE('11.2.0.4')
DB_VERSION('11.2.0.4')
ALL_ROWS
OUTLINE_LEAF(@"SEL$1")
FULL(@"SEL$1" "E"@"SEL$1")--E表全表扫描full
INDEX(@"SEL$1" "M"@"SEL$1" ("EMP"."EMPNO"))--M表索引扫描index
LEADING(@"SEL$1" "E"@"SEL$1" "M"@"SEL$1")--E表驱动M表
USE_NL(@"SEL$1" "M"@"SEL$1")--连接方式nl
NLJ_BATCHING(@"SEL$1" "M"@"SEL$1")
END_OUTLINE_DATA
*/
Optimizer state dump:
Compilation Environment Dump
optimizer_mode_hinted= false
optimizer_features_hinted= 0.0.0
parallel_execution_enabled= true
parallel_query_forced_dop= 0
parallel_dml_forced_dop= 0
parallel_ddl_forced_degree= 0
parallel_ddl_forced_instances= 0
_query_rewrite_fudge= 90
optimizer_features_enable= 11.2.0.4
_optimizer_search_limit= 5
cpu_count= 4
active_instance_count= 1
parallel_threads_per_cpu= 2
hash_area_size= 131072
bitmap_merge_area_size= 1048576
sort_area_size= 65536
sort_area_retained_size= 0
_sort_elimination_cost_ratio= 0
_optimizer_block_size= 8192
_sort_multiblock_read_count= 2
_hash_multiblock_io_count= 0
_db_file_optimizer_read_count= 8
_optimizer_max_permutations= 2000
pga_aggregate_target= 204800 KB
_pga_max_size= 204800 KB
_query_rewrite_maxdisjunct= 257
_smm_auto_min_io_size= 56 KB
_smm_auto_max_io_size= 248 KB
_smm_min_size= 204 KB
_smm_max_size_static= 40960 KB
_smm_px_max_size_static= 102400 KB
_cpu_to_io= 0
_optimizer_undo_cost_change= 11.2.0.4
parallel_query_mode= enabled
parallel_dml_mode= disabled
parallel_ddl_mode= enabled
optimizer_mode= all_rows
sqlstat_enabled= false
_optimizer_percent_parallel= 101
_always_anti_join= choose
_always_semi_join= choose
_optimizer_mode_force= true
_partition_view_enabled= true
_always_star_transformation= false
_query_rewrite_or_error= false
_hash_join_enabled= true
cursor_sharing= exact
_b_tree_bitmap_plans= true
star_transformation_enabled= false
_optimizer_cost_model= choose
_new_sort_cost_estimate= true
_complex_view_merging= true
_unnest_subquery= true
_eliminate_common_subexpr= true
_pred_move_around= true
_convert_set_to_join= false
_push_join_predicate= true
_push_join_union_view= true
_fast_full_scan_enabled= true
_optim_enhance_nnull_detection= true
_parallel_broadcast_enabled= true
_px_broadcast_fudge_factor= 100
_ordered_nested_loop= true
_no_or_expansion= false
optimizer_index_cost_adj= 100
optimizer_index_caching= 0
_system_index_caching= 0
_disable_datalayer_sampling= false
query_rewrite_enabled= true
query_rewrite_integrity= enforced
_query_cost_rewrite= true
_query_rewrite_2= true
_query_rewrite_1= true
_query_rewrite_expression= true
_query_rewrite_jgmigrate= true
_query_rewrite_fpc= true
_query_rewrite_drj= true
_full_pwise_join_enabled= true
_partial_pwise_join_enabled= true
_left_nested_loops_random= true
_improved_row_length_enabled= true
_index_join_enabled= true
_enable_type_dep_selectivity= true
_improved_outerjoin_card= true
_optimizer_adjust_for_nulls= true
_optimizer_degree= 0
_use_column_stats_for_function= true
_subquery_pruning_enabled= true
_subquery_pruning_mv_enabled= false
_or_expand_nvl_predicate= true
_like_with_bind_as_equality= false
_table_scan_cost_plus_one= true
_cost_equality_semi_join= true
_default_non_equality_sel_check= true
_new_initial_join_orders= true
_oneside_colstat_for_equijoins= true
_optim_peek_user_binds= true
_minimal_stats_aggregation= true
_force_temptables_for_gsets= false
workarea_size_policy= auto
_smm_auto_cost_enabled= true
_gs_anti_semi_join_allowed= true
_optim_new_default_join_sel= true
optimizer_dynamic_sampling= 2
_pre_rewrite_push_pred= true
_optimizer_new_join_card_computation = true
_union_rewrite_for_gs= yes_gset_mvs
_generalized_pruning_enabled= true
_optim_adjust_for_part_skews= true
_force_datefold_trunc= false
statistics_level= typical
_optimizer_system_stats_usage= true
skip_unusable_indexes= true
_remove_aggr_subquery= true
_optimizer_push_down_distinct= 0
_dml_monitoring_enabled= true
_optimizer_undo_changes= false
_predicate_elimination_enabled= true
_nested_loop_fudge= 100
_project_view_columns= true
_local_communication_costing_enabled = true
_local_communication_ratio= 50
_query_rewrite_vop_cleanup= true
_slave_mapping_enabled= true
_optimizer_cost_based_transformation = linear
_optimizer_mjc_enabled= true
_right_outer_hash_enable= true
_spr_push_pred_refspr= true
_optimizer_cache_stats= false
_optimizer_cbqt_factor= 50
_optimizer_squ_bottomup= true
_fic_area_size= 131072
_optimizer_skip_scan_enabled= true
_optimizer_cost_filter_pred= false
_optimizer_sortmerge_join_enabled= true
_optimizer_join_sel_sanity_check= true
_mmv_query_rewrite_enabled= true
_bt_mmv_query_rewrite_enabled= true
_add_stale_mv_to_dependency_list= true
_distinct_view_unnesting= false
_optimizer_dim_subq_join_sel= true
_optimizer_disable_strans_sanity_checks = 0
_optimizer_compute_index_stats= true
_push_join_union_view2= true
_optimizer_ignore_hints= false
_optimizer_random_plan= 0
_query_rewrite_setopgrw_enable= true
_optimizer_correct_sq_selectivity= true
_disable_function_based_index= false
_optimizer_join_order_control= 3
_optimizer_cartesian_enabled= true
_optimizer_starplan_enabled= true
_extended_pruning_enabled= true
_optimizer_push_pred_cost_based= true
_optimizer_null_aware_antijoin= true
_optimizer_extend_jppd_view_types= true
_sql_model_unfold_forloops= run_time
_enable_dml_lock_escalation= false
_bloom_filter_enabled= true
_update_bji_ipdml_enabled= 0
_optimizer_extended_cursor_sharing= udo
_dm_max_shared_pool_pct= 1
_optimizer_cost_hjsmj_multimatch= true
_optimizer_transitivity_retain= true
_px_pwg_enabled= true
optimizer_secure_view_merging= true
_optimizer_join_elimination_enabled = true
flashback_table_rpi= non_fbt
_optimizer_cbqt_no_size_restriction = true
_optimizer_enhanced_filter_push= true
_optimizer_filter_pred_pullup= true
_rowsrc_trace_level= 0
_simple_view_merging= true
_optimizer_rownum_pred_based_fkr= true
_optimizer_better_inlist_costing= all
_optimizer_self_induced_cache_cost= false
_optimizer_min_cache_blocks= 10
_optimizer_or_expansion= depth
_optimizer_order_by_elimination_enabled = true
_optimizer_outer_to_anti_enabled= true
_selfjoin_mv_duplicates= true
_dimension_skip_null= true
_force_rewrite_enable= false
_optimizer_star_tran_in_with_clause = true
_optimizer_complex_pred_selectivity = true
_optimizer_connect_by_cost_based= true
_gby_hash_aggregation_enabled= true
_globalindex_pnum_filter_enabled= true
_px_minus_intersect= true
_fix_control_key= 0
_force_slave_mapping_intra_part_loads = false
_force_tmp_segment_loads= false
_query_mmvrewrite_maxpreds= 10
_query_mmvrewrite_maxintervals= 5
_query_mmvrewrite_maxinlists= 5
_query_mmvrewrite_maxdmaps= 10
_query_mmvrewrite_maxcmaps= 20
_query_mmvrewrite_maxregperm= 512
_query_mmvrewrite_maxqryinlistvals= 500
_disable_parallel_conventional_load = false
_trace_virtual_columns= false
_replace_virtual_columns= true
_virtual_column_overload_allowed= true
_kdt_buffering= true
_first_k_rows_dynamic_proration= true
_optimizer_sortmerge_join_inequality = true
_optimizer_aw_stats_enabled= true
_bloom_pruning_enabled= true
result_cache_mode= MANUAL
_px_ual_serial_input= true
_optimizer_skip_scan_guess= false
_enable_row_shipping= true
_row_shipping_threshold= 80
_row_shipping_explain= false
transaction_isolation_level= read_commited
_optimizer_distinct_elimination= true
_optimizer_multi_level_push_pred= true
_optimizer_group_by_placement= true
_optimizer_rownum_bind_default= 10
_enable_query_rewrite_on_remote_objs = true
_optimizer_extended_cursor_sharing_rel = simple
_optimizer_adaptive_cursor_sharing= true
_direct_path_insert_features= 0
_optimizer_improve_selectivity= true
optimizer_use_pending_statistics= false
_optimizer_enable_density_improvements = true
_optimizer_aw_join_push_enabled= true
_optimizer_connect_by_combine_sw= true
_enable_pmo_ctas= 0
_optimizer_native_full_outer_join= force
_bloom_predicate_enabled= true
_optimizer_enable_extended_stats= true
_is_lock_table_for_ddl_wait_lock= 0
_pivot_implementation_method= choose
optimizer_capture_sql_plan_baselines = false
optimizer_use_sql_plan_baselines= true
_optimizer_star_trans_min_cost= 0
_optimizer_star_trans_min_ratio= 0
_with_subquery= OPTIMIZER
_optimizer_fkr_index_cost_bias= 10
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parallel_degree_policy= manual
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Query Block Registry:
SEL$1 0xcceb2550 (PARSER) [FINAL]
:
call(in-use=23136, alloc=82128), compile(in-use=133400, alloc=195152), execution(in-use=13256, alloc=16200)
End of Optimizer State Dump
Dumping Hints
=============
====================== END SQL Statement Dump ======================
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