Restrictions for Database Initialization Parameters

Autonomous Database configures database initialization parameters automatically when you provision a database. You do not need to set any initialization parameters to start using your service. But, you can modify some parameters if you need to.

List of Initialization Parameters that can be Modified

APPROX_FOR_AGGREGATION
APPROX_FOR_COUNT_DISTINCT
APPROX_FOR_PERCENTILE
AWR_PDB_AUTOFLUSH_ENABLED
CONTAINER_DATA
CURRENT_SCHEMA (Allowed only with ALTER SESSION)
CURSOR_SHARING
DDL_LOCK_TIMEOUT
FIXED_DATE
LDAP_DIRECTORY_ACCESS
MAX_IDLE_TIME
MAX_STRING_SIZE (See Restrictions for Data Types for details)
NLS_CALENDAR
NLS_COMP
NLS_CURRENCY
NLS_DATE_FORMAT
NLS_DATE_LANGUAGE
NLS_DUAL_CURRENCY
NLS_ISO_CURRENCY
NLS_LANGUAGE
NLS_LENGTH_SEMANTICS
NLS_NCHAR_CONV_EXCP
NLS_NUMERIC_CHARACTERS
NLS_SORT
NLS_TERRITORY
NLS_TIME_FORMAT
NLS_TIME_TZ_FORMAT
NLS_TIMESTAMP_FORMAT
NLS_TIMESTAMP_TZ_FORMAT
OPTIMIZER_CAPTURE_SQL_PLAN_BASELINES  (Allowed only with ALTER SESSION)
OPTIMIZER_IGNORE_HINTS
OPTIMIZER_IGNORE_PARALLEL_HINTS
OPTIMIZER_MODE
PLSCOPE_SETTINGS
PLSQL_CCFLAGS
PLSQL_DEBUG
PLSQL_OPTIMIZE_LEVEL
PLSQL_WARNINGS
QUERY_REWRITE_INTEGRITY
RESULT_CACHE_MODE
STATISTICS_LEVEL (Allowed only with ALTER SESSION)
TIME_ZONE (Allowed only with ALTER SESSION)

For more information on initialization parameters see Oracle Database Reference. For more information on TIME_ZONE, see Oracle Database SQL Language Reference.

For more information on OPTIMIZER_IGNORE_HINTS and OPTIMIZER_IGNORE_PARALLEL_HINTS, see Manage Optimizer Statistics on Autonomous Database.