How to find out all default values in init.ora?

This small test case shows it.

[oracle@node1 ~]$ echo $ORACLE_HOME
/u01/app/oracle/product/11.2.0.3/dbhome_1
[oracle@node1 ~]$ cd $ORACLE_HOME/dbs
[oracle@node1 dbs]$ echo db_name=TEST > initTEST.ora
[oracle@node1 dbs]$ export ORACLE_SID=TEST
[oracle@node1 dbs]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.3.0 Production on Fri Jan 10 21:49:54 2014

Copyright (c) 1982, 2011, Oracle.  All rights reserved.

Connected to an idle instance.

SQL> startup nomount
ORACLE instance started.

Total System Global Area  167395328 bytes
Fixed Size                  1343640 bytes
Variable Size             113250152 bytes
Database Buffers           50331648 bytes
Redo Buffers                2469888 bytes
SQL> create pfile='/u01/app/oracle/product/11.2.0.3/dbhome_1/dbs/initTEST_from_memory.ora' from memory;

File created.

SQL> shu abort
ORACLE instance shut down.
SQL> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

[oracle@node1 dbs]$ cat initTEST_from_memory.ora
# Oracle init.ora parameter file generated by instance TEST on 01/10/2014 21:50:25
__oracle_base='/u01/app/oracle' # ORACLE_BASE set from environment
_aggregation_optimization_settings=0
_always_anti_join='CHOOSE'
_always_semi_join='CHOOSE'
_and_pruning_enabled=TRUE
_b_tree_bitmap_plans=TRUE
_bloom_filter_enabled=TRUE
_bloom_folding_enabled=TRUE
_bloom_pruning_enabled=TRUE
_complex_view_merging=TRUE
_compression_compatibility='11.2.0'
_connect_by_use_union_all='TRUE'
_convert_set_to_join=FALSE
_cost_equality_semi_join=TRUE
_cpu_to_io=0
_dimension_skip_null=TRUE
_eliminate_common_subexpr=TRUE
_enable_type_dep_selectivity=TRUE
_fast_full_scan_enabled=TRUE
_first_k_rows_dynamic_proration=TRUE
_gby_hash_aggregation_enabled=TRUE
_generalized_pruning_enabled=TRUE
_globalindex_pnum_filter_enabled=TRUE
_gs_anti_semi_join_allowed=TRUE
_improved_outerjoin_card=TRUE
_improved_row_length_enabled=TRUE
_index_join_enabled=TRUE
_ksb_restart_policy_times='0'
_ksb_restart_policy_times='60'
_ksb_restart_policy_times='120'
_ksb_restart_policy_times='240' # internal update to set default
_left_nested_loops_random=TRUE
_local_communication_costing_enabled=TRUE
_minimal_stats_aggregation=TRUE
_mmv_query_rewrite_enabled=TRUE
_new_initial_join_orders=TRUE
_new_sort_cost_estimate=TRUE
_nlj_batching_enabled=1
_optim_adjust_for_part_skews=TRUE
_optim_enhance_nnull_detection=TRUE
_optim_new_default_join_sel=TRUE
_optim_peek_user_binds=TRUE
_optimizer_adaptive_cursor_sharing=TRUE
_optimizer_better_inlist_costing='ALL'
_optimizer_cbqt_no_size_restriction=TRUE
_optimizer_coalesce_subqueries=TRUE
_optimizer_complex_pred_selectivity=TRUE
_optimizer_compute_index_stats=TRUE
_optimizer_connect_by_combine_sw=TRUE
_optimizer_connect_by_cost_based=TRUE
_optimizer_connect_by_elim_dups=TRUE
_optimizer_correct_sq_selectivity=TRUE
_optimizer_cost_based_transformation='LINEAR'
_optimizer_cost_hjsmj_multimatch=TRUE
_optimizer_cost_model='CHOOSE'
_optimizer_dim_subq_join_sel=TRUE
_optimizer_distinct_agg_transform=TRUE
_optimizer_distinct_elimination=TRUE
_optimizer_distinct_placement=TRUE
_optimizer_eliminate_filtering_join=TRUE
_optimizer_enable_density_improvements=TRUE
_optimizer_enable_extended_stats=TRUE
_optimizer_enable_table_lookup_by_nl=TRUE
_optimizer_enhanced_filter_push=TRUE
_optimizer_extend_jppd_view_types=TRUE
_optimizer_extended_cursor_sharing='UDO'
_optimizer_extended_cursor_sharing_rel='SIMPLE'
_optimizer_extended_stats_usage_control=192
_optimizer_false_filter_pred_pullup=TRUE
_optimizer_fast_access_pred_analysis=TRUE
_optimizer_fast_pred_transitivity=TRUE
_optimizer_filter_pred_pullup=TRUE
_optimizer_fkr_index_cost_bias=10
_optimizer_full_outer_join_to_outer=TRUE
_optimizer_group_by_placement=TRUE
_optimizer_improve_selectivity=TRUE
_optimizer_interleave_jppd=TRUE
_optimizer_join_elimination_enabled=TRUE
_optimizer_join_factorization=TRUE
_optimizer_join_order_control=3
_optimizer_join_sel_sanity_check=TRUE
_optimizer_max_permutations=2000
_optimizer_mode_force=TRUE
_optimizer_multi_level_push_pred=TRUE
_optimizer_native_full_outer_join='FORCE'
_optimizer_new_join_card_computation=TRUE
_optimizer_null_aware_antijoin=TRUE
_optimizer_or_expansion='DEPTH'
_optimizer_order_by_elimination_enabled=TRUE
_optimizer_outer_join_to_inner=TRUE
_optimizer_outer_to_anti_enabled=TRUE
_optimizer_push_down_distinct=0
_optimizer_push_pred_cost_based=TRUE
_optimizer_rownum_bind_default=10
_optimizer_rownum_pred_based_fkr=TRUE
_optimizer_skip_scan_enabled=TRUE
_optimizer_sortmerge_join_inequality=TRUE
_optimizer_squ_bottomup=TRUE
_optimizer_star_tran_in_with_clause=TRUE
_optimizer_system_stats_usage=TRUE
_optimizer_table_expansion=TRUE
_optimizer_transitivity_retain=TRUE
_optimizer_try_st_before_jppd=TRUE
_optimizer_undo_cost_change='11.2.0.3'
_optimizer_unnest_corr_set_subq=TRUE
_optimizer_unnest_disjunctive_subq=TRUE
_optimizer_use_cbqt_star_transformation=TRUE
_optimizer_use_feedback=TRUE
_or_expand_nvl_predicate=TRUE
_ordered_nested_loop=TRUE
_parallel_broadcast_enabled=TRUE
_partition_view_enabled=TRUE
_pivot_implementation_method='CHOOSE'
_pre_rewrite_push_pred=TRUE
_pred_move_around=TRUE
_push_join_predicate=TRUE
_push_join_union_view=TRUE
_push_join_union_view2=TRUE
_px_minus_intersect=TRUE
_px_partition_scan_enabled=TRUE
_px_pwg_enabled=TRUE
_px_ual_serial_input=TRUE
_query_rewrite_setopgrw_enable=TRUE
_remove_aggr_subquery=TRUE
_replace_virtual_columns=TRUE
_right_outer_hash_enable=TRUE
_selfjoin_mv_duplicates=TRUE
_sql_model_unfold_forloops='RUN_TIME'
_subquery_pruning_enabled=TRUE
_subquery_pruning_mv_enabled=FALSE
_table_scan_cost_plus_one=TRUE
_union_rewrite_for_gs='YES_GSET_MVS'
_unnest_subquery=TRUE
_use_column_stats_for_function=TRUE
background_dump_dest='/u01/app/oracle/diag/rdbms/test/TEST/trace' #Deprecate parameter
core_dump_dest='/u01/app/oracle/diag/rdbms/test/TEST/cdump'
db_name='TEST'
log_buffer=2330624 # log buffer update
optimizer_dynamic_sampling=2
optimizer_mode='ALL_ROWS'
plsql_warnings='DISABLE:ALL' # PL/SQL warnings at init.ora
query_rewrite_enabled='TRUE'
result_cache_max_size=0
skip_unusable_indexes=TRUE
user_dump_dest='/u01/app/oracle/diag/rdbms/test/TEST/trace' #Deprecate parameter
[oracle@node1 dbs]$
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