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RDS Oracle Database 12c

The optimization pack for Oracle Database 12c on Amazon RDS.

Metrics

Memory

Metric
Unit
Description
oracle_sga_total_size
bytes
The current memory size of the SGA.
oracle_sga_free_size
bytes
The amount of SGA currently available.
oracle_sga_max_size
bytes
The configured maximum memory size for the SGA.
oracle_pga_target_size
bytes
The configured target memory size for the PGA.
oracle_redo_buffers_size
bytes
The memory size of the redo buffers.
oracle_default_buffer_cache_size
bytes
The memory size for the DEFAULT buffer cache component.
oracle_default_2k_buffer_cache_size
bytes
The memory size for the DEFAULT 2k buffer cache component.
oracle_default_4k_buffer_cache_size
bytes
The memory size for the DEFAULT 4k buffer cache component.
oracle_default_8k_buffer_cache_size
bytes
The memory size for the DEFAULT 8k buffer cache component.
oracle_default_16k_buffer_cache_size
bytes
The memory size for the DEFAULT 16k buffer cache component.
oracle_default_32k_buffer_cache_size
bytes
The memory size for the DEFAULT 32k buffer cache component.
oracle_keep_buffer_cache_size
bytes
The memory size for the KEEP buffer cache component.
oracle_recycle_buffer_cache_size
bytes
The memory size for the RECYCLE buffer cache component.
oracle_asm_buffer_cache_size
bytes
The memory size for the ASM buffer cache component.
oracle_shared_io_pool_size
bytes
The memory size for the IO pool component.
oracle_java_pool_size
bytes
The memory size for the Java pool component.
oracle_large_pool_size
bytes
The memory size for the large pool component.
oracle_shared_pool_size
bytes
The memory size for the shared pool component.
oracle_streams_pool_size
bytes
The memory size for the streams pool component.
oracle_buffer_cache_hit_ratio
percent
How often a requested block has been found in the buffer cache without requiring disk access.

Event waits

Metric
Unit
Description
oracle_wait_class_commit
percent
The percentage of time spent waiting on the events of class 'Commit'.
oracle_wait_class_concurrency
percent
The percentage of time spent waiting on the events of class 'Concurrency'.
oracle_wait_class_system_io
percent
The percentage of time spent waiting on the events of class 'System I/O'.
oracle_wait_class_user_io
percent
The percentage of time spent waiting on the events of class 'User I/O'.
oracle_wait_class_other
percent
The percentage of time spent waiting on the events of class 'Other'.
oracle_wait_class_scheduler
percent
The percentage of time spent waiting on the events of class 'Scheduler'.
oracle_wait_class_idle
percent
The percentage of time spent waiting on the events of class 'Idle'.
oracle_wait_class_application
percent
The percentage of time spent waiting on the events of class 'Application'.
oracle_wait_class_network
percent
The percentage of time spent waiting on the events of class 'Network'.
oracle_wait_class_configuration
percent
The percentage of time spent waiting on the events of class 'Configuration'.
oracle_wait_event_log_file_sync
percent
The percentage of time spent waiting on the 'log file sync' event.
oracle_wait_event_log_file_parallel_write
percent
The percentage of time spent waiting on the 'log file parallel write' event.
oracle_wait_event_log_file_sequential_read
percent
The percentage of time spent waiting on the 'log file sequential read' event.
oracle_wait_event_enq_tx_contention
percent
The percentage of time spent waiting on the 'enq: TX - contention' event.
oracle_wait_event_enq_tx_row_lock_contention
percent
The percentage of time spent waiting on the 'enq: TX - row lock contention' event.
oracle_wait_event_latch_row_cache_objects
percent
The percentage of time spent waiting on the 'latch: row cache objects' event.
oracle_wait_event_latch_shared_pool
percent
The percentage of time spent waiting on the 'latch: shared pool' event.
oracle_wait_event_resmgr_cpu_quantum
percent
The percentage of time spent waiting on the 'resmgr:cpu quantum' event.
oracle_wait_event_sql_net_message_from_client
percent
The percentage of time spent waiting on the 'SQL*Net message from client' event.
oracle_wait_event_rdbms_ipc_message
percent
The percentage of time spent waiting on the 'rdbms ipc message' event.
oracle_wait_event_db_file_sequential_read
percent
The percentage of time spent waiting on the 'db file sequential read' event.
oracle_wait_event_log_file_switch_checkpoint_incomplete
percent
The percentage of time spent waiting on the 'log file switch (checkpoint incomplete)' event.
oracle_wait_event_row_cache_lock
percent
The percentage of time spent waiting on the 'row cache lock' event.
oracle_wait_event_buffer_busy_waits
percent
The percentage of time spent waiting on the 'buffer busy waits' event.
oracle_wait_event_db_file_async_io_submit
percent
The percentage of time spent waiting on the 'db file async I/O submit' event.

Sessions

Metric
Unit
Description
oracle_sessions_active_user
sessions
The number of active user sessions.
oracle_sessions_inactive_user
sessions
The number of inactive user sessions.
oracle_sessions_active_background
sessions
The number of active background sessions.
oracle_sessions_inactive_background
sessions
The number of inactive background sessions.

Other metrics

Metric
Unit
Description
oracle_calls_execute_count
calls
Total number of calls (user and recursive) that executed SQL statements.
oracle_tuned_undoretention
seconds
The amount of time for which undo will not be recycled from the time it was committed.
oracle_max_query_length
seconds
The length of the longest query executed.
oracle_transaction_count
transactions
The total number of transactions executed within the period.
oracle_sso_errors
errors/s
The number of ORA-01555 (snapshot too old) errors raised per second.
oracle_redo_log_space_requests
requests
The number of times a user process waits for space in the redo log file, usually caused by checkpointing or log switching.

Parameters

Memory

Parameter
Unit
Default value
Domain
Restart
Description
bitmap_merge_area_size
kilobytes
1024
02097152
yes
The amount of memory Oracle uses to merge bitmaps retrieved from a range scan of the index.
create_bitmap_area_size
megabytes
8192
02097152
yes
Size of create bitmap buffer for bitmap index. Relevant only for systems containing bitmap indexes.
db_cache_size
megabytes
48
02097152
no
The size of the DEFAULT buffer pool for standard block size buffers. The value must be at least 4M * cpu number.
hash_area_size
kilobytes
128
02097151
yes
Maximum size of in-memory hash work area maximum amount of memory.
java_pool_size
megabytes
24
016384
no
The size of the Java pool. If SGA_TARGET is set, this value represents the minimum value for the memory pool.
large_pool_size
megabytes
0
065536
no
The size of large pool allocation heap.
memory_max_target
megabytes
8192
1522097152
yes
The maximum value to which a DBA can set the MEMORY_TARGET initialization parameter.
memory_target
megabytes
6864
02097152
no
Oracle systemwide usable memory. The database tunes memory to the MEMORY_TARGET value, reducing or enlarging the SGA and PGA as needed.
olap_page_pool_size
bytes
0
02147483647
no
Size of the olap page pool.
pga_aggregate_limit
megabytes
2048
02097152
no
The limit on the aggregate PGA memory consumed by the instance.
pga_aggregate_target
megabytes
1024
02097152
no
The target aggregate PGA memory available to all server processes attached to the instance.
pre_page_sga
FALSE
TRUE, FALSE
yes
Read the entire SGA into memory at instance startup.
result_cache_max_result
percent
5
0100
no
Maximum result size as a percent of the cache size.
result_cache_max_size
megabytes
0
065536
no
The maximum amount of SGA memory that can be used by the Result Cache.
result_cache_mode
MANUAL
MANUAL, FORCE
no
Specifies when a ResultCache operator is spliced into a query's execution plan.
result_cache_remote_expiration
minutes
0
010000
no
The expiration in minutes of remote objects. High values may cause stale answers.
sga_max_size
megabytes
8192
02097152
yes
The maximum size of the SGA for the lifetime of the instance.
sga_min_size
megabytes
2920
01048576
no
The guaranteed SGA size for a pluggable database (PDB). When SGA_MIN_SIZE is set for a PDB, it guarantees the specified SGA size for the PDB.
sga_target
megabytes
5840
02097152
no
The total size of all SGA components, acts as the minimum value for the size of the SGA.
shared_pool_reserved_size
megabytes
128
12048
yes
The shared pool space reserved for large contiguous requests for shared pool memory.
shared_pool_size
megabytes
0
065536
no
The size of the shared pool.
sort_area_retained_size
kilobytes
0
02097151
no
The maximum amount of the User Global Area memory retained after a sort run completes.
sort_area_size
kilobytes
64
02097151
no
The maximum amount of memory Oracle will use for a sort. If more space is required then temporary segments on disks are used.
streams_pool_size
megabytes
0
02097152
no
Size of the streams pool.
use_large_pages
TRUE
ONLY, FALSE, TRUE
yes
Enable the use of large pages for SGA memory.
workarea_size_policy
AUTO
MANUAL, AUTO
no
Policy used to size SQL working areas (MANUAL/AUTO).

Redo

Parameter
Unit
Default value
Domain
Restart
Description
commit_logging
BATCH
IMMEDIATE, BATCH
no
Control how redo is batched by Log Writer.
commit_wait
WAIT
NOWAIT, WAIT, FORCE_WAIT
no
Control when the redo for a commit is flushed to the redo logs.
log_archive_max_processes
processes
4
130
no
Maximum number of active ARCH processes.
log_buffer
megabytes
16
2256
yes
The amount of memory that Oracle uses when buffering redo entries to a redo log file.
log_checkpoint_interval
blocks
0
02147483647
no
The maximum number of log file blocks between incremental checkpoints.
log_checkpoint_timeout
seconds
1800
02147483647
no
Maximum time interval between checkpoints. Guarantees a no buffer remains dirty for more than the specified time.

Undo

Parameter
Unit
Default value
Domain
Restart
Description
db_flashback_retention_target
minutes
1440
302147483647
no
Maximum Flashback Database log retention time.
undo_retention
seconds
900
02147483647
no
Low threshold value of undo retention.

Optimizer

Parameter
Unit
Default value
Domain
Restart
Description
optimizer_capture_sql_plan_baselines
FALSE
TRUE, FALSE
no
Automatic capture of SQL plan baselines for repeatable statements
optimizer_dynamic_sampling
2
011
no
Controls both when the database gathers dynamic statistics, and the size of the sample that the optimizer uses to gather the statistics.
optimizer_features_enable
11.2.0.4
11.2.0.4.1, 11.2.0.4, 11.2.0.3, 11.2.0.2, 11.2.0.1, 11.1.0.7, 11.1.0.6, 10.2.0.5, 10.2.0.4, 10.2.0.3, 10.2.0.2, 10.2.0.1, 10.1.0.5, 10.1.0.4, 10.1.0.3, 10.1.0, 9.2.0.8, 9.2.0, 9.0.1, 9.0.0, 8.1.7, 8.1.6, 8.1.5, 8.1.4, 8.1.3, 8.1.0, 8.0.7, 8.0.6, 8.0.5, 8.0.4, 8.0.3, 8.0.0
no
Enable a series of optimizer features based on an Oracle release number.
optimizer_index_caching
0
0100
no
Adjust the behavior of cost-based optimization to favor nested loops joins and IN-list iterators.
optimizer_index_cost_adj
100
110000
no
Tune optimizer behavior for access path selection to be more or less index friendly.
optimizer_mode
ALL_ROWS
ALL_ROWS, FIRST_ROWS, FIRST_ROWS_1, FIRST_ROWS_10, FIRST_ROWS_100, FIRST_ROWS_1000
no
The default behavior for choosing an optimization approach for the instance.
optimizer_secure_view_merging
TRUE
TRUE, FALSE
no
Enables security checks when the optimizer uses view merging.
optimizer_use_invisible_indexes
FALSE
TRUE, FALSE
no
Enable or disables the use of invisible indexes.
optimizer_use_pending_statistics
FALSE
TRUE, FALSE
no
Control whether the optimizer uses pending statistics when compiling SQL statements.
optimizer_use_sql_plan_baselines
TRUE
TRUE, FALSE
no
Enables the use of SQL plan baselines stored in SQL Management Base.

Approximate exection

Parameter
Unit
Default value
Domain
Restart
Description
approx_for_aggregation
FALSE
TRUE, FALSE
no
Replace exact query processing for aggregation queries with approximate query processing.
approx_for_count_distinct
FALSE
TRUE, FALSE
no
Automatically replace COUNT (DISTINCT expr) queries with APPROX_COUNT_DISTINCT queries.
approx_for_percentile
NONE
NONE, PERCENTILE_CONT, PERCENTILE_CONT DETERMINISTIC, PERCENTILE_DISC, PERCENTILE_DISC DETERMINISTIC, ALL, ALL DETERMINISTIC
no
Converts exact percentile functions to their approximate percentile function counterparts.

Parallel processing

Parameter
Unit
Default value
Domain
Restart
Description
parallel_degree_policy
MANUAL
MANUAL, LIMITED, AUTO
no
Policy used to compute the degree of parallelism (MANUAL/LIMITED/AUTO).
parallel_execution_message_size
16384
214832768
yes
Message buffer size for parallel execution.
parallel_force_local
FALSE
TRUE, FALSE
no
Force single instance execution.
parallel_max_servers
processes
0
03600
no
The maximum number of parallel execution processes and parallel recovery processes for an instance.
parallel_min_servers
processes
0
02000
no
The minimum number of execution processes kept alive to service parallel statements.
parallel_min_percent
percent
0
0100
yes
The minimum percentage of parallel execution processes (of the value of PARALLEL_MAX_SERVERS) required for parallel execution.

Resources

Parameter
Unit
Default value
Domain
Restart
Description
circuits
circuits
10
03000
no
The total number of virtual circuits that are available for inbound and outbound network sessions.
cpu_count
cpus
0
0512
no
Number of CPUs available for the Oracle instance to use.
cursor_bind_capture_destination
MEMORY+DISK
OFF, MEMORY, MEMORY+DISK
no
Allowed destination for captured bind variables.
cursor_sharing
EXACT
FORCE, EXACT, SIMILAR
no
Cursor sharing mode.
cursor_space_for_time
FALSE
TRUE, FALSE
yes
Use more memory in order to get faster execution.
db_files
files
200
20020000
yes
The maximum number of database files that can be opened for this database. This may be subject to OS constraints.
open_cursors
cursors
300
065535
no
The maximum number of open cursors (handles to private SQL areas) a session can have at once.
open_links
connections
4
0255
yes
The maximum number of concurrent open connections to remote databases in one session.
open_links_per_instance
connections
4
02147483647
yes
Maximum number of migratable open connections globally for each database instance.
processes
processes
100
8020000
yes
The maximum number of OS user processes that can simultaneously connect to Oracle.
serial_reuse
DISABLE
DISABLE, ALL, SELECT, DML, PLSQL, FORCE
yes
Types of cursors that make use of the serial-reusable memory feature.
session_cached_cursors
50
065535
no
Number of session cursors to cache.
session_max_open_files
10
150
yes
Maximum number of open files allowed per session.
sessions
sessions
1262
10065532
no
The maximum number of sessions that can be created in the system, effectively the maximum number of concurrent users in the system.
transactions
transactions
1388
42147483647
yes
The maximum number of concurrent transactions.

Other parameters

Parameter
Unit
Default value
Domain
Restart
Description
aq_tm_processes
1
040
no
Number of AQ Time Managers to start.
audit_sys_operations
FALSE
TRUE, FALSE
yes
Enable sys auditing
audit_trail
NONE
NONE, OS, DB, TRUE, FALSE, DB_EXTENDED, XML, EXTENDED
yes
Configure system auditing.
client_result_cache_lag
milliseconds
3000
060000