_optimizer_ignore_hints is now optimizer_ignore_hints

I’m refreshing our Hands-On Lab for Oracle Database 18c. And as part of a performance evaluation I wanted to set an underscore parameter to ignore all hints my load test tool sets. But then I learned: This does not work anymore as _optimizer_ignore_hints is now optimizer_ignore_hints. We made the underscore obsolete in Oracle Database 18c. _optimizer_ignore_hints is now optimizer_ignore_hints Actually in Oracle Database 12.2.0.1 you can find a long list of obsolete parameters here: Obsolete Parameters in Oracle Database 12.2.0.1 (Nov 10, 2016) To be precise: We obsoleted159 parameters. In addition, in Oracle Database 18c we added an additional 8…

Obsolete SPFILE Parameters in Oracle Database 12.2.0.1

This is the 2nd posting in my series about init.ora/SPFILE parameters in Oracle Database 12.2.0.1. New SPFILE Parameters in Oracle Database 12.2.0.1 Obsolete SPFILE Parameters in Oracle Database 12.2.0.1 Deprecated SPFILE Parameters in Oracle Database 12.2.0.1 Default SPFILE Parameter changes between Oracle Database 11.2.0.4, 12.1.0.2 and 12.2.0.1 Find the list of the 159 obsoleted parameters here (and of course in V$OBSOLETE_PARAMETERS): _app_ctx_vers _average_dirties_half_life _aw_row_source_enabled _compatible_no_recovery _data_transfer_cache_size _db_no_mount_lock _dlm_send_timeout _dtree_bintest_id _dtree_compressbmp_enabled _evolve_plan_baseline_report_level _fast_start_instance_recovery_target _fic_max_length _fic_outofmem_candidates _idl_conventional_index_maintenance _kgl_latch_count _kks_free_cursor_stat_pct _kspptbl_mem_usage _lm_direct_sends _lm_multiple_receivers _lm_rcv_buffer_size _lm_statistics _log_archive_buffer_size _log_io_size _max_log_write_io_parallelism _module_action_old_length _optimizer_adaptive_plans _optimizer_choose_permutation _oracle_trace_events _oracle_trace_facility_version _plan_verify_local_time_limit _plsql_conditional_compilation _px_async_getgranule _px_slaves_share_cursors _seq_process_cache_const _spr_use_hash_table _sqlexec_progression_cost _use_hidden_partitions _very_large_partitioned_table allow_partial_sn_results…