Which one should I drop - undo or rollback?

I have both undo tablespace and rollback tablespace. Is it possible I can drop any one of them?
Below is the free space in each. By looking at these figures, the undotbs1 tablespace can be dropped. Howver I neeed to know if there is any risk in dropping it ...and how to take precaution sagaint any risks?
tablespacename || free space
RBS || 40.91%
UNDOTBS1 || 99.87%
Thanks

Hi,
Parameters as you requested.
NUM NAME TYPE VALUE ISDEFAULT ISSES_MODIFIABLE ISSYS_MODIFIABLE ISMODIFIED ISADJUSTED DESCRIPTION UPDATE_COMMENT
2 tracefile_identifier 2 TRUE TRUE FALSE FALSE FALSE trace file custom identifier
18 processes 3 150 FALSE FALSE FALSE FALSE FALSE user processes
20 sessions 3 170 TRUE FALSE FALSE FALSE FALSE user and system sessions
21 timed_statistics 1 TRUE FALSE TRUE IMMEDIATE FALSE FALSE maintain internal timing statistics
22 timed_os_statistics 3 0 TRUE TRUE IMMEDIATE FALSE FALSE internal os statistic gathering interval in seconds
23 resource_limit 1 FALSE TRUE FALSE IMMEDIATE FALSE FALSE master switch for resource limit
24 license_max_sessions 3 0 TRUE FALSE IMMEDIATE FALSE FALSE maximum number of non-system user sessions allowed
25 license_sessions_warning 3 0 TRUE FALSE IMMEDIATE FALSE FALSE warning level for number of non-system user sessions
33 cpu_count 3 2 TRUE FALSE FALSE FALSE FALSE initial number of cpu's for this instance
36 instance_groups 2 TRUE FALSE FALSE FALSE FALSE list of instance group names
37 event 2 TRUE FALSE FALSE FALSE FALSE debug event control - default null string
44 shared_pool_size 6 50331648 FALSE FALSE IMMEDIATE FALSE FALSE size in bytes of shared pool
45 sga_max_size 6 537993848 FALSE FALSE FALSE FALSE FALSE max total SGA size internally adjusted
49 shared_pool_reserved_size 6 2516582 TRUE FALSE FALSE FALSE FALSE size in bytes of reserved area of shared pool
52 large_pool_size 6 8388608 FALSE FALSE IMMEDIATE FALSE FALSE size in bytes of the large allocation pool
54 java_pool_size 6 41943040 FALSE FALSE FALSE FALSE FALSE size in bytes of the Java pool
55 java_soft_sessionspace_limit 3 0 TRUE FALSE FALSE FALSE FALSE warning limit on size in bytes of a Java sessionspace
56 java_max_sessionspace_size 3 0 TRUE FALSE FALSE FALSE FALSE max allowed size in bytes of a Java sessionspace
57 pre_page_sga 1 FALSE TRUE FALSE FALSE FALSE FALSE pre-page sga for process
58 shared_memory_address 3 0 TRUE FALSE FALSE FALSE FALSE SGA starting address (low order 32-bits on 64-bit platforms)
59 hi_shared_memory_address 3 0 TRUE FALSE FALSE FALSE FALSE SGA starting address (high order 32-bits on 64-bit platforms)
60 use_indirect_data_buffers 1 FALSE TRUE FALSE FALSE FALSE FALSE Enable indirect data buffers (very large SGA on 32-bit platforms
62 lock_sga 1 FALSE TRUE FALSE FALSE FALSE FALSE Lock entire SGA in physical memory
77 spfile 2 %ORACLE_HOME%\DATABASE\SPFILE%ORACLE_SID%.ORA TRUE FALSE FALSE FALSE FALSE server parameter file
81 lock_name_space 2 TRUE FALSE FALSE FALSE FALSE lock name space used for generating lock names for standby/clone
83 enqueue_resources 3 968 TRUE FALSE FALSE FALSE FALSE resources for enqueues
88 trace_enabled 1 TRUE TRUE FALSE IMMEDIATE FALSE FALSE enable KST tracing
96 nls_language 2 AMERICAN TRUE TRUE FALSE FALSE FALSE NLS language name
97 nls_territory 2 AMERICA TRUE TRUE FALSE FALSE FALSE NLS territory name
98 nls_sort 2 TRUE TRUE FALSE FALSE FALSE NLS linguistic definition name
99 nls_date_language 2 TRUE TRUE FALSE FALSE FALSE NLS date language name
100 nls_date_format 2 TRUE TRUE FALSE FALSE FALSE NLS Oracle date format
101 nls_currency 2 TRUE TRUE FALSE FALSE FALSE NLS local currency symbol
102 nls_numeric_characters 2 TRUE TRUE FALSE FALSE FALSE NLS numeric characters
103 nls_iso_currency 2 TRUE TRUE FALSE FALSE FALSE NLS ISO currency territory name
104 nls_calendar 2 TRUE TRUE FALSE FALSE FALSE NLS calendar system name
105 nls_time_format 2 TRUE TRUE FALSE FALSE FALSE time format
106 nls_timestamp_format 2 TRUE TRUE FALSE FALSE FALSE time stamp format
107 nls_time_tz_format 2 TRUE TRUE FALSE FALSE FALSE time with timezone format
108 nls_timestamp_tz_format 2 TRUE TRUE FALSE FALSE FALSE timestampe with timezone format
109 nls_dual_currency 2 TRUE TRUE FALSE FALSE FALSE Dual currency symbol
110 nls_comp 2 TRUE TRUE FALSE FALSE FALSE NLS comparison
111 nls_length_semantics 2 BYTE TRUE TRUE IMMEDIATE FALSE FALSE create columns using byte or char semantics by default
112 nls_nchar_conv_excp 2 FALSE TRUE TRUE IMMEDIATE FALSE FALSE NLS raise an exception instead of allowing implicit conversion
120 filesystemio_options 2 TRUE TRUE IMMEDIATE FALSE FALSE IO operations on filesystem files
124 disk_asynch_io 1 TRUE TRUE FALSE FALSE FALSE FALSE Use asynch I/O for random access devices
125 tape_asynch_io 1 TRUE TRUE FALSE FALSE FALSE FALSE Use asynch I/O requests for tape devices
127 dbwr_io_slaves 3 0 TRUE FALSE FALSE FALSE FALSE DBWR I/O slaves
131 backup_tape_io_slaves 1 FALSE TRUE FALSE DEFERRED FALSE FALSE BACKUP Tape I/O slaves
135 resource_manager_plan 2 TRUE FALSE IMMEDIATE FALSE FALSE resource mgr top plan
144 cluster_interconnects 2 TRUE FALSE FALSE FALSE FALSE interconnects for RAC use
147 file_mapping 1 FALSE TRUE FALSE IMMEDIATE FALSE FALSE enable file mapping
165 active_instance_count 3 TRUE FALSE FALSE FALSE FALSE number of active instances in the cluster database
228 control_files 2 E:\ORACLE\ORADATA\ora92dbd\CONTROL01.CTL, E:\ORACLE\ORADATA\ora92dbd\CONTROL02.CTL, E:\ORACLE\ORADATA\ora92dbd\CONTROL03.CTL FALSE FALSE FALSE FALSE FALSE control file names list
230 db_file_name_convert 2 TRUE FALSE FALSE FALSE FALSE datafile name convert patterns and strings for standby/clone db
231 log_file_name_convert 2 TRUE FALSE FALSE FALSE FALSE logfile name convert patterns and strings for standby/clone db
232 db_block_buffers 3 0 TRUE FALSE FALSE FALSE FALSE Number of database blocks cached in memory
236 db_block_checksum 1 TRUE TRUE FALSE IMMEDIATE FALSE FALSE store checksum in db blocks and check during reads
237 db_block_size 3 8192 FALSE FALSE FALSE FALSE FALSE Size of database block in bytes
244 db_writer_processes 3 1 TRUE FALSE FALSE FALSE FALSE number of background database writer processes to start
258 db_keep_cache_size 6 0 TRUE FALSE IMMEDIATE FALSE FALSE Size of KEEP buffer pool for standard block size buffers
259 db_recycle_cache_size 6 0 TRUE FALSE IMMEDIATE FALSE FALSE Size of RECYCLE buffer pool for standard block size buffers
260 db_2k_cache_size 6 0 TRUE FALSE IMMEDIATE FALSE FALSE Size of cache for 2K buffers
261 db_4k_cache_size 6 0 TRUE FALSE IMMEDIATE FALSE FALSE Size of cache for 4K buffers
262 db_8k_cache_size 6 0 TRUE FALSE IMMEDIATE FALSE FALSE Size of cache for 8K buffers
263 db_16k_cache_size 6 0 TRUE FALSE IMMEDIATE FALSE FALSE Size of cache for 16K buffers
264 db_32k_cache_size 6 0 TRUE FALSE IMMEDIATE FALSE FALSE Size of cache for 32K buffers
265 db_cache_size 6 109051904 FALSE FALSE IMMEDIATE FALSE FALSE Size of DEFAULT buffer pool for standard block size buffers
267 buffer_pool_keep 2 TRUE FALSE FALSE FALSE FALSE Number of database blocks/latches in keep buffer pool
268 buffer_pool_recycle 2 TRUE FALSE FALSE FALSE FALSE Number of database blocks/latches in recycle buffer pool
295 db_cache_advice 2 ON TRUE FALSE IMMEDIATE FALSE FALSE Buffer cache sizing advisory
304 max_commit_propagation_delay 3 700 TRUE FALSE FALSE FALSE FALSE Max age of new snapshot in .01 seconds
306 compatible 2 9.2.0.0.0 FALSE FALSE FALSE FALSE FALSE Database will be completely compatible with this software versio
312 remote_archive_enable 2 true TRUE FALSE FALSE FALSE FALSE remote archival enable setting
313 log_archive_start 1 TRUE FALSE FALSE FALSE FALSE FALSE start archival process on SGA initialization
317 log_archive_dest 2 TRUE FALSE IMMEDIATE FALSE FALSE archival destination text string
318 log_archive_duplex_dest 2 TRUE FALSE IMMEDIATE FALSE FALSE duplex archival destination text string
319 log_archive_dest_1 2 location=F:\ORACLE\ARCHIVE FALSE TRUE IMMEDIATE FALSE FALSE archival destination #1 text string
320 log_archive_dest_2 2 TRUE TRUE IMMEDIATE FALSE FALSE archival destination #2 text string
321 log_archive_dest_3 2 TRUE TRUE IMMEDIATE FALSE FALSE archival destination #3 text string
322 log_archive_dest_4 2 TRUE TRUE IMMEDIATE FALSE FALSE archival destination #4 text string
323 log_archive_dest_5 2 TRUE TRUE IMMEDIATE FALSE FALSE archival destination #5 text string
324 log_archive_dest_6 2 TRUE TRUE IMMEDIATE FALSE FALSE archival destination #6 text string
325 log_archive_dest_7 2 TRUE TRUE IMMEDIATE FALSE FALSE archival destination #7 text string
326 log_archive_dest_8 2 TRUE TRUE IMMEDIATE FALSE FALSE archival destination #8 text string
327 log_archive_dest_9 2 TRUE TRUE IMMEDIATE FALSE FALSE archival destination #9 text string
328 log_archive_dest_10 2 TRUE TRUE IMMEDIATE FALSE FALSE archival destination #10 text string
329 log_archive_dest_state_1 2 enable TRUE TRUE IMMEDIATE FALSE FALSE archival destination #1 state text string
330 log_archive_dest_state_2 2 enable TRUE TRUE IMMEDIATE FALSE FALSE archival destination #2 state text string
331 log_archive_dest_state_3 2 enable TRUE TRUE IMMEDIATE FALSE FALSE archival destination #3 state text string
332 log_archive_dest_state_4 2 enable TRUE TRUE IMMEDIATE FALSE FALSE archival destination #4 state text string
333 log_archive_dest_state_5 2 enable TRUE TRUE IMMEDIATE FALSE FALSE archival destination #5 state text string
334 log_archive_dest_state_6 2 enable TRUE TRUE IMMEDIATE FALSE FALSE archival destination #6 state text string
335 log_archive_dest_state_7 2 enable TRUE TRUE IMMEDIATE FALSE FALSE archival destination #7 state text string
336 log_archive_dest_state_8 2 enable TRUE TRUE IMMEDIATE FALSE FALSE archival destination #8 state text string
337 log_archive_dest_state_9 2 enable TRUE TRUE IMMEDIATE FALSE FALSE archival destination #9 state text string
338 log_archive_dest_state_10 2 enable TRUE TRUE IMMEDIATE FALSE FALSE archival destination #10 state text string
339 log_archive_max_processes 3 2 TRUE FALSE IMMEDIATE FALSE FALSE maximum number of active ARCH processes
342 log_archive_min_succeed_dest 3 1 TRUE TRUE IMMEDIATE FALSE FALSE minimum number of archive destinations that must succeed
343 standby_archive_dest 2 %ORACLE_HOME%\RDBMS TRUE FALSE IMMEDIATE FALSE FALSE standby database archivelog destination text string
344 log_archive_trace 3 0 TRUE FALSE IMMEDIATE FALSE FALSE Establish archivelog operation tracing level
345 fal_server 2 TRUE FALSE IMMEDIATE FALSE FALSE FAL server list
346 fal_client 2 TRUE FALSE IMMEDIATE FALSE FALSE FAL client
347 log_archive_format 2 ARC%S.%T TRUE FALSE FALSE FALSE FALSE archival destination format
355 log_buffer 3 524288 TRUE FALSE FALSE FALSE FALSE redo circular buffer size
357 log_checkpoint_interval 3 0 TRUE FALSE IMMEDIATE FALSE FALSE # redo blocks checkpoint threshold
358 log_checkpoint_timeout 3 1800 TRUE FALSE IMMEDIATE FALSE FALSE Maximum time interval between checkpoints in seconds
360 archive_lag_target 3 0 TRUE FALSE IMMEDIATE FALSE FALSE Maximum number of seconds of redos the standby could lose
365 log_parallelism 3 1 TRUE FALSE FALSE FALSE FALSE Number of log buffer strands
367 db_files 3 200 TRUE FALSE FALSE FALSE FALSE max allowable # db files
368 db_file_multiblock_read_count 3 16 FALSE TRUE IMMEDIATE FALSE FALSE db block to be read each IO
370 read_only_open_delayed 1 FALSE TRUE FALSE FALSE FALSE FALSE if TRUE delay opening of read only files until first access
371 cluster_database 1 FALSE FALSE FALSE FALSE FALSE FALSE if TRUE startup in cluster database mode
372 parallel_server 1 FALSE TRUE FALSE FALSE FALSE FALSE if TRUE startup in parallel server mode
373 parallel_server_instances 3 1 TRUE FALSE FALSE FALSE FALSE number of instances to use for sizing OPS SGA structures
374 cluster_database_instances 3 1 TRUE FALSE FALSE FALSE FALSE number of instances to use for sizing cluster db SGA structures
376 db_create_file_dest 2 TRUE TRUE IMMEDIATE FALSE FALSE default database location
377 db_create_online_log_dest_1 2 TRUE TRUE IMMEDIATE FALSE FALSE online log/controlfile destination #1
378 db_create_online_log_dest_2 2 TRUE TRUE IMMEDIATE FALSE FALSE online log/controlfile destination #2
379 db_create_online_log_dest_3 2 TRUE TRUE IMMEDIATE FALSE FALSE online log/controlfile destination #3
380 db_create_online_log_dest_4 2 TRUE TRUE IMMEDIATE FALSE FALSE online log/controlfile destination #4
381 db_create_online_log_dest_5 2 TRUE TRUE IMMEDIATE FALSE FALSE online log/controlfile destination #5
382 standby_file_management 2 MANUAL TRUE FALSE IMMEDIATE FALSE FALSE if auto then files are created/dropped automatically on standby
391 gc_files_to_locks 2 TRUE FALSE FALSE FALSE FALSE mapping between file numbers and global cache locks (DFS)
414 thread 3 0 TRUE FALSE FALSE FALSE FALSE Redo thread to mount
417 fast_start_io_target 3 0 TRUE FALSE IMMEDIATE FALSE FALSE Upper bound on recovery reads
418 fast_start_mttr_target 3 300 FALSE FALSE IMMEDIATE FALSE FALSE MTTR target of forward crash recovery in seconds
423 log_checkpoints_to_alert 1 FALSE TRUE FALSE IMMEDIATE FALSE FALSE log checkpoint begin/end to alert file
424 recovery_parallelism 3 0 TRUE FALSE FALSE FALSE FALSE number of server processes to use for parallel recovery
425 control_file_record_keep_time 3 7 TRUE FALSE IMMEDIATE FALSE FALSE control file record keep time in days
426 logmnr_max_persistent_sessions 3 1 TRUE FALSE FALSE FALSE FALSE maximum number of threads to mine
430 dml_locks 3 748 TRUE FALSE FALSE FALSE FALSE dml locks - one for each table modified in a transaction
431 row_locking 2 always TRUE FALSE FALSE FALSE FALSE row-locking
432 serializable 1 FALSE TRUE FALSE FALSE FALSE FALSE serializable
433 replication_dependency_tracking 1 TRUE TRUE FALSE FALSE FALSE FALSE tracking dependency for Replication parallel propagation
436 instance_number 3 0 TRUE FALSE FALSE FALSE FALSE instance number
443 transactions 3 187 TRUE FALSE FALSE FALSE FALSE max. number of concurrent active transactions
444 transactions_per_rollback_segment 3 5 TRUE FALSE FALSE FALSE FALSE number of active transactions per rollback segment
445 max_rollback_segments 3 37 TRUE FALSE FALSE FALSE FALSE max. number of rollback segments in SGA cache
447 rollback_segments 2 TRUE FALSE FALSE FALSE FALSE undo segment list
452 transaction_auditing 1 TRUE TRUE FALSE DEFERRED FALSE FALSE transaction auditing records generated in the redo log
455 undo_management 2 AUTO FALSE FALSE FALSE FALSE FALSE instance runs in SMU mode if TRUE, else in RBU mode
456 undo_tablespace 2 UNDOTBS1 FALSE FALSE IMMEDIATE FALSE FALSE use/switch undo tablespace
460 undo_suppress_errors 1 FALSE TRUE TRUE IMMEDIATE FALSE FALSE Suppress RBU errors in SMU mode
465 undo_retention 3 10800 FALSE FALSE IMMEDIATE FALSE FALSE undo retention in seconds
469 fast_start_parallel_rollback 2 LOW TRUE FALSE IMMEDIATE FALSE FALSE max number of parallel recovery slaves that may be used
471 db_block_checking 1 FALSE TRUE TRUE IMMEDIATE FALSE FALSE data and index block checking
487 os_roles 1 FALSE TRUE FALSE FALSE FALSE FALSE retrieve roles from the operating system
488 rdbms_server_dn 2 TRUE FALSE FALSE FALSE FALSE RDBMS's Distinguished Name
489 max_enabled_roles 3 100 FALSE FALSE FALSE FALSE FALSE max number of roles a user can have enabled
490 remote_os_authent 1 FALSE TRUE FALSE FALSE FALSE FALSE allow non-secure remote clients to use auto-logon accounts
491 remote_os_roles 1 FALSE TRUE FALSE FALSE FALSE FALSE allow non-secure remote clients to use os roles
492 O7_DICTIONARY_ACCESSIBILITY 1 FALSE TRUE FALSE FALSE FALSE FALSE Version 7 Dictionary Accessibility Support
494 remote_login_passwordfile 2 EXCLUSIVE FALSE FALSE FALSE FALSE FALSE password file usage parameter
495 dblink_encrypt_login 1 FALSE TRUE FALSE FALSE FALSE FALSE enforce password for distributed login always be encrypted
496 license_max_users 3 0 TRUE FALSE IMMEDIATE FALSE FALSE maximum number of named users that can be created in the databas
498 global_context_pool_size 2 TRUE FALSE FALSE FALSE FALSE Global Application Context Pool Size in Bytes
500 audit_sys_operations 1 FALSE TRUE FALSE FALSE FALSE FALSE enable sys auditing
501 db_domain 2 govnet.local FALSE FALSE FALSE FALSE FALSE directory part of global database name stored with CREATE DATABA
502 global_names 1 TRUE FALSE TRUE IMMEDIATE FALSE FALSE enforce that database links have same name as remote database
503 distributed_lock_timeout 3 60 TRUE FALSE FALSE FALSE FALSE number of seconds a distributed transaction waits for a lock
505 commit_point_strength 3 1 TRUE FALSE FALSE FALSE FALSE Bias this node has toward not preparing in a two-phase commit
506 instance_name 2 ora92dbd FALSE FALSE FALSE FALSE FALSE instance name supported by the instance
507 service_names 2 ora92dbd.govnet.local TRUE FALSE IMMEDIATE FALSE FALSE service names supported by the instance
508 dispatchers 2 (PROTOCOL=TCP) (SERVICE=ora92dbdXDB) FALSE FALSE IMMEDIATE FALSE FALSE specifications of dispatchers
509 mts_dispatchers 2 (PROTOCOL=TCP) (SERVICE=ora92dbdXDB) TRUE FALSE IMMEDIATE FALSE FALSE specifications of dispatchers
510 shared_servers 3 1 TRUE FALSE IMMEDIATE FALSE FALSE number of shared servers to start up
511 mts_servers 3 1 TRUE FALSE IMMEDIATE FALSE FALSE number of shared servers to start up
512 max_shared_servers 3 20 TRUE FALSE FALSE FALSE FALSE max number of shared servers
513 mts_max_servers 3 20 TRUE FALSE FALSE FALSE FALSE max number of shared servers
514 max_dispatchers 3 5 TRUE FALSE FALSE FALSE FALSE max number of dispatchers
515 mts_max_dispatchers 3 5 TRUE FALSE FALSE FALSE FALSE max number of dispatchers
516 circuits 3 170 TRUE FALSE FALSE FALSE FALSE max number of circuits
517 mts_circuits 3 170 TRUE FALSE FALSE FALSE FALSE max number of circuits
518 shared_server_sessions 3 165 TRUE FALSE FALSE FALSE FALSE max number of shared server sessions
519 mts_sessions 3 165 TRUE FALSE FALSE FALSE FALSE max number of shared server sessions
520 local_listener 2 TRUE FALSE IMMEDIATE FALSE FALSE local listener
521 remote_listener 2 TRUE FALSE IMMEDIATE FALSE FALSE remote listener
525 mts_service 2 ora92dbd TRUE FALSE FALSE FALSE FALSE service supported by dispatchers
526 mts_listener_address 2 TRUE FALSE FALSE FALSE FALSE address(es) of network listener
527 mts_multiple_listeners 1 FALSE TRUE FALSE FALSE FALSE FALSE Are multiple listeners enabled?
528 serial_reuse 2 DISABLE TRUE FALSE FALSE FALSE FALSE reuse the frame segments
529 cursor_space_for_time 1 FALSE TRUE FALSE FALSE FALSE FALSE use more memory in order to get faster execution
530 session_cached_cursors 3 0 TRUE TRUE FALSE FALSE FALSE number of cursors to save in the session cursor cache
531 remote_dependencies_mode 2 TIMESTAMP TRUE TRUE IMMEDIATE FALSE FALSE remote-procedure-call dependencies mode parameter
532 utl_file_dir 2 F:\UTIL_FILE_DIR\ FALSE FALSE FALSE FALSE FALSE utl_file accessible directories list
534 plsql_v2_compatibility 1 FALSE TRUE TRUE IMMEDIATE FALSE FALSE PL/SQL version 2.x compatibility flag
535 plsql_compiler_flags 2 INTERPRETED TRUE TRUE IMMEDIATE FALSE FALSE PL/SQL compiler flags
536 plsql_native_c_compiler 2 TRUE FALSE IMMEDIATE FALSE FALSE plsql native C compiler
537 plsql_native_linker 2 TRUE FALSE IMMEDIATE FALSE FALSE plsql native linker
538 plsql_native_library_dir 2 TRUE FALSE IMMEDIATE FALSE FALSE plsql native library dir
539 plsql_native_make_utility 2 TRUE FALSE IMMEDIATE FALSE FALSE plsql native compilation make utility
540 plsql_native_make_file_name 2 TRUE FALSE IMMEDIATE FALSE FALSE plsql native compilation make file
541 plsql_native_library_subdir_count 3 0 TRUE FALSE IMMEDIATE FALSE FALSE plsql native library number of subdirectories
543 job_queue_processes 3 10 FALSE FALSE IMMEDIATE FALSE FALSE number of job queue slave processes
547 parallel_min_percent 3 0 TRUE TRUE FALSE FALSE FALSE minimum percent of threads required for parallel query
550 create_bitmap_area_size 3 8388608 TRUE FALSE FALSE FALSE FALSE size of create bitmap buffer for bitmap index
551 bitmap_merge_area_size 3 1048576 TRUE FALSE FALSE FALSE FALSE maximum memory allow for BITMAP MERGE
553 cursor_sharing 2 EXACT TRUE TRUE IMMEDIATE FALSE FALSE cursor sharing mode
557 parallel_min_servers 3 0 TRUE FALSE FALSE FALSE FALSE minimum parallel query servers per instance
558 parallel_max_servers 3 5 TRUE FALSE FALSE FALSE FALSE maximum parallel query servers per instance
562 parallel_instance_group 2 TRUE TRUE IMMEDIATE FALSE FALSE instance group to use for all parallel operations
565 parallel_execution_message_size 3 2148 TRUE FALSE FALSE FALSE FALSE message buffer size for parallel execution
573 hash_join_enabled 1 TRUE FALSE TRUE FALSE FALSE FALSE enable/disable hash join
574 hash_area_size 3 1048576 TRUE TRUE FALSE FALSE FALSE size of in-memory hash work area
582 shadow_core_dump 2 partial TRUE FALSE FALSE FALSE FALSE Core Size for Shadow Processes
583 background_core_dump 2 partial TRUE FALSE FALSE FALSE FALSE Core Size for Background Processes
584 background_dump_dest 2 c:\oracle\admin\ora92dbd\bdump FALSE FALSE IMMEDIATE FALSE FALSE Detached process dump directory
585 user_dump_dest 2 c:\oracle\admin\ora92dbd\udump FALSE FALSE IMMEDIATE FALSE FALSE User process dump directory
586 max_dump_file_size 2 UNLIMITED TRUE TRUE IMMEDIATE FALSE FALSE Maximum size (blocks) of dump file
587 core_dump_dest 2 c:\oracle\admin\ora92dbd\cdump FALSE FALSE IMMEDIATE FALSE FALSE Core dump directory
589 oracle_trace_enable 1 FALSE TRUE TRUE IMMEDIATE FALSE FALSE Oracle Trace enabled/disabled
590 oracle_trace_facility_path 2 %ORACLE_HOME%\OTRACE\ADMIN\FDF\ TRUE FALSE FALSE FALSE FALSE Oracle TRACE facility path
591 oracle_trace_collection_path 2 %ORACLE_HOME%\OTRACE\ADMIN\CDF\ TRUE FALSE FALSE FALSE FALSE Oracle TRACE collection path
592 oracle_trace_facility_name 2 oracled TRUE FALSE FALSE FALSE FALSE Oracle TRACE default facility name
593 oracle_trace_collection_name 2 TRUE FALSE FALSE FALSE FALSE Oracle TRACE default collection name
594 oracle_trace_collection_size 3 5242880 TRUE FALSE FALSE FALSE FALSE Oracle TRACE collection file max. size
597 object_cache_optimal_size 3 102400 TRUE TRUE DEFERRED FALSE FALSE optimal size of the user session's object cache in bytes
598 object_cache_max_size_percent 3 10 TRUE TRUE DEFERRED FALSE FALSE percentage of maximum size over optimal of the user session's ob
600 session_max_open_files 3 10 TRUE FALSE FALSE FALSE FALSE maximum number of open files allowed per session
604 open_links 3 4 TRUE FALSE FALSE FALSE FALSE max # open links per session
605 open_links_per_instance 3 4 TRUE FALSE FALSE FALSE FALSE max # open links per instance
610 optimizer_features_enable 2 9.2.0 TRUE FALSE FALSE FALSE FALSE optimizer plan compatibility parameter
611 fixed_date 2 TRUE FALSE IMMEDIATE FALSE FALSE fixed SYSDATE value
612 audit_trail 2 NONE TRUE FALSE FALSE FALSE FALSE enable system auditing
613 sort_area_size 3 524288 FALSE TRUE DEFERRED FALSE FALSE size of in-memory sort work area
614 sort_area_retained_size 3 0 TRUE TRUE DEFERRED FALSE FALSE size of in-memory sort work area retained between fetch calls
620 db_name 2 ora92dbd FALSE FALSE FALSE FALSE FALSE database name specified in CREATE DATABASE
621 open_cursors 3 300 FALSE FALSE IMMEDIATE FALSE FALSE max # cursors per session
622 ifile 4 TRUE FALSE FALSE FALSE FALSE include file in init.ora
623 sql_trace 1 FALSE TRUE FALSE FALSE FALSE FALSE enable SQL trace
625 os_authent_prefix 2 OPS$ TRUE FALSE FALSE FALSE FALSE prefix for auto-logon accounts
627 optimizer_mode 2 FIRST_ROWS FALSE TRUE FALSE FALSE FALSE optimizer mode
632 sql92_security 1 FALSE TRUE FALSE FALSE FALSE FALSE require select privilege for searched update/delete
634 blank_trimming 1 FALSE TRUE FALSE FALSE FALSE FALSE blank trimming semantics parameter
636 partition_view_enabled 1 FALSE TRUE TRUE FALSE FALSE FALSE enable/disable partitioned views
639 star_transformation_enabled 2 FALSE FALSE TRUE FALSE FALSE FALSE enable the use of star transformation
667 parallel_adaptive_multi_user 1 FALSE TRUE FALSE IMMEDIATE FALSE FALSE enable adaptive setting of degree for multiple user streams
668 parallel_threads_per_cpu 3 2 TRUE FALSE IMMEDIATE FALSE FALSE number of parallel execution threads per CPU
669 parallel_automatic_tuning 1 FALSE TRUE FALSE FALSE FALSE FALSE enable intelligent defaults for parallel execution parameters
689 optimizer_max_permutations 3 2000 TRUE TRUE FALSE FALSE FALSE optimizer maximum join permutations per query block
690 optimizer_index_cost_adj 3 100 TRUE TRUE FALSE FALSE FALSE optimizer index cost adjustment
691 optimizer_index_caching 3 0 TRUE TRUE FALSE FALSE FALSE optimizer percent index caching
698 query_rewrite_enabled 2 FALSE FALSE TRUE IMMEDIATE FALSE FALSE allow rewrite of queries using materialized views if enabled
699 query_rewrite_integrity 2 enforced TRUE TRUE IMMEDIATE FALSE FALSE perform rewrite using materialized views with desired integrity
727 sql_version 2 NATIVE TRUE TRUE FALSE FALSE FALSE sql language version parameter for compatibility issues
754 pga_aggregate_target 6 52428800 FALSE FALSE IMMEDIATE FALSE FALSE Target size for the aggregate PGA memory consumed by the instanc
756 workarea_size_policy 2 AUTO TRUE TRUE IMMEDIATE FALSE FALSE policy used to size SQL working areas (MANUAL/AUTO)
775 optimizer_dynamic_sampling 3 1 TRUE TRUE IMMEDIATE FALSE FALSE optimizer dynamic sampling
792 statistics_level 2 TYPICAL TRUE TRUE IMMEDIATE FALSE FALSE statistics level
795 aq_tm_processes 3 1 FALSE FALSE IMMEDIATE FALSE FALSE number of AQ Time Managers to start
797 hs_autoregister 1 TRUE TRUE FALSE IMMEDIATE FALSE FALSE enable automatic server DD updates in HS agent self-registration
798 dg_broker_start 1 FALSE TRUE FALSE IMMEDIATE FALSE FALSE start Data Guard broker framework (DMON process)
799 drs_start 1 FALSE TRUE FALSE IMMEDIATE FALSE FALSE start DG Broker monitor (DMON process)
800 dg_broker_config_file1 2 %ORACLE_HOME%\DATABASE\DR1%ORACLE_SID%.DAT TRUE FALSE IMMEDIATE FALSE FALSE data guard broker configuration file #1
801 dg_broker_config_file2 2 %ORACLE_HOME%\DATABASE\DR2%ORACLE_SID%.DAT TRUE FALSE IMMEDIATE FALSE FALSE data guard broker configuration file #2
802 olap_page_pool_size 3 33554432 TRUE TRUE DEFERRED FALSE FALSE size of the olap page pool in bytes
SQL> show parameter undo;
NAME TYPE VALUE
undo_management string AUTO
undo_retention integer 10800
undo_suppress_errors boolean FALSE
undo_tablespace string UNDOTBS1
SQL>

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