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OFE_12.1.0.2_in_12.2.0.1.sql
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OFE_12.1.0.2_in_12.2.0.1.sql
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-- Oracle provided script
REM DESCRIPTION :
REM This script is used to set the CBO parameters and fix control
REM settings to downgrade the optimizer features to 12.1.0.2
REM in an 12.2.0.1 Database environment with default optimizer features set.
REM These are the parameters and fix controls that are linked to OFE and
REM change its values upon OFE change. However, there are some parameters and
REM fix controls that are not linked to OFE and hence such parameters/fix controls
REM would remain unchanged upon OFE change.
REM Starting 12.1.0.2.170418 DBBP, Optimizer fixes are included as part of bundle patches
REM with the fix controls disabled by default for those fixes. Hence there are chances for
REM difference in the fix control settings given in the script with the customer environment
REM when the customer environment is 12.1.0.2.170418 DBBP or above.
REM NOTES
REM 1. For errors see OFE_12.1.0.2_in_12.2.0.1.log
REM 2. This can be used in ADG (read-only standby database) environment also.
REM CBO Hidden Parameters To be set in 12.2.0.1 Optimizer Env to come to 12.1.0.2 OFE level
alter session set "_optimizer_undo_cost_change"="12.1.0.2";
alter session set "_optimizer_cbqt_or_expansion"=off;
alter session set "_optimizer_ads_use_partial_results"=false;
alter session set "_query_rewrite_use_on_query_computation"=false;
alter session set "_px_scalable_invdist_mcol"=false;
alter session set "_optimizer_eliminate_subquery"=false;
alter session set "_sqlexec_hash_based_distagg_ssf_enabled"=false;
alter session set "_optimizer_union_all_gsets"=false;
alter session set "_optimizer_enhanced_join_elimination"=false;
alter session set "_optimizer_multicol_join_elimination"=false;
alter session set "_key_vector_create_pushdown_threshold"=0;
alter session set "_optimizer_enable_plsql_stats"=false;
alter session set "_recursive_with_parallel"=false;
alter session set "_recursive_with_branch_iterations"=1;
alter session set "_px_dist_agg_partial_rollup_pushdown"=off;
alter session set "_optimizer_key_vector_pruning_enabled"=false;
alter session set "_pwise_distinct_enabled"=false;
alter session set "_vector_encoding_mode"=off;
alter session set "_ds_xt_split_count"=0;
alter session set "_ds_sampling_method"=NO_QUALITY_METRIC;
alter session set "_optimizer_ads_use_spd_cache"=false;
alter session set "_optimizer_use_table_scanrate"=OFF;
alter session set "_optimizer_use_xt_rowid"=false;
alter session set "_xt_sampling_scan_granules"=off;
alter session set "_optimizer_band_join_aware"=false;
alter session set "_optimizer_vector_base_dim_fact_factor"=0;
alter session set "_ds_enable_view_sampling"=false;
alter session set "_optimizer_inmemory_use_stored_stats"=NEVER;
alter session set "_mv_access_compute_fresh_data"=off;
alter session set "_bloom_filter_ratio"=30;
alter session set "_optimizer_control_shard_qry_processing"=65535;
alter session set "_optimizer_interleave_or_expansion"=false;
/
PRO CBO Parameters settings completed.
PAUSE Press Enter to continue.
REM CBO Fix Control Settings in 12.2.0.1 Optimizer Env to come to 12.1.0.2 OFE level
alter session set "_fix_control"="16515789:0";
alter session set "_fix_control"="17491018:0";
alter session set "_fix_control"="17986549:0";
alter session set "_fix_control"="18115594:0";
alter session set "_fix_control"="18182018:0";
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alter session set "_fix_control"="24654471:0";
alter session set "_fix_control"="24845754:0";
/
SPO OFF;
PRO Fix control settings completed.
ALTER session set "_fix_control"='5483301:OFF';