Working with parameters on your RDS for PostgreSQL DB instance (original) (raw)

application_name

Dynamic

Sets the application name to be reported in statistics and logs.

archive_command

Dynamic

Sets the shell command that will be called to archive a WAL file.

array_nulls

Dynamic

Enables input of NULL elements in arrays.

authentication_timeout

Dynamic

Sets the maximum allowed time to complete client authentication.

autovacuum

Dynamic

Starts the autovacuum subprocess.

autovacuum_analyze_scale_factor

Dynamic

Number of tuple inserts, updates, or deletes before analyze as a fraction of reltuples.

autovacuum_analyze_threshold

Dynamic

Minimum number of tuple inserts, updates, or deletes before analyze.

autovacuum_freeze_max_age

Static

Age at which to autovacuum a table to prevent transaction ID wraparound.

autovacuum_naptime

Dynamic

Time to sleep between autovacuum runs.

autovacuum_max_workers

Static

Sets the maximum number of simultaneously running autovacuum worker processes.

autovacuum_vacuum_cost_delay

Dynamic

Vacuum cost delay, in milliseconds, for autovacuum.

autovacuum_vacuum_cost_limit

Dynamic

Vacuum cost amount available before napping, for autovacuum.

autovacuum_vacuum_scale_factor

Dynamic

Number of tuple updates or deletes before vacuum as a fraction of reltuples.

autovacuum_vacuum_threshold

Dynamic

Minimum number of tuple updates or deletes before vacuum.

backslash_quote

Dynamic

Sets whether a backslash (\) is allowed in string literals.

bgwriter_delay

Dynamic

Background writer sleep time between rounds.

bgwriter_lru_maxpages

Dynamic

Background writer maximum number of LRU pages to flush per round.

bgwriter_lru_multiplier

Dynamic

Multiple of the average buffer usage to free per round.

bytea_output

Dynamic

Sets the output format for bytes.

check_function_bodies

Dynamic

Checks function bodies during CREATE FUNCTION.

checkpoint_completion_target

Dynamic

Time spent flushing dirty buffers during checkpoint, as a fraction of the checkpoint interval.

checkpoint_segments

Dynamic

Sets the maximum distance in log segments between automatic write-ahead log (WAL) checkpoints.

checkpoint_timeout

Dynamic

Sets the maximum time between automatic WAL checkpoints.

checkpoint_warning

Dynamic

Enables warnings if checkpoint segments are filled more frequently than this.

client_connection_check_interval

Dynamic

Sets the time interval between checks for disconnection while running queries.

client_encoding

Dynamic

Sets the client's character set encoding.

client_min_messages

Dynamic

Sets the message levels that are sent to the client.

commit_delay

Dynamic

Sets the delay in microseconds between transaction commit and flushing WAL to disk.

commit_siblings

Dynamic

Sets the minimum concurrent open transactions before performing commit_delay.

constraint_exclusion

Dynamic

Enables the planner to use constraints to optimize queries.

cpu_index_tuple_cost

Dynamic

Sets the planner's estimate of the cost of processing each index entry during an index scan.

cpu_operator_cost

Dynamic

Sets the planner's estimate of the cost of processing each operator or function call.

cpu_tuple_cost

Dynamic

Sets the planner's estimate of the cost of processing each tuple (row).

cursor_tuple_fraction

Dynamic

Sets the planner's estimate of the fraction of a cursor's rows that will be retrieved.

datestyle

Dynamic

Sets the display format for date and time values.

deadlock_timeout

Dynamic

Sets the time to wait on a lock before checking for deadlock.

debug_pretty_print

Dynamic

Indents parse and plan tree displays.

debug_print_parse

Dynamic

Logs each query's parse tree.

debug_print_plan

Dynamic

Logs each query's execution plan.

debug_print_rewritten

Dynamic

Logs each query's rewritten parse tree.

default_statistics_target

Dynamic

Sets the default statistics target.

default_tablespace

Dynamic

Sets the default tablespace to create tables and indexes in.

default_transaction_deferrable

Dynamic

Sets the default deferrable status of new transactions.

default_transaction_isolation

Dynamic

Sets the transaction isolation level of each new transaction.

default_transaction_read_only

Dynamic

Sets the default read-only status of new transactions.

default_with_oids

Dynamic

Creates new tables with object IDs (OIDs) by default.

effective_cache_size

Dynamic

Sets the planner's assumption about the size of the disk cache.

effective_io_concurrency

Dynamic

Number of simultaneous requests that can be handled efficiently by the disk subsystem.

enable_bitmapscan

Dynamic

Enables the planner's use of bitmap-scan plans.

enable_hashagg

Dynamic

Enables the planner's use of hashed aggregation plans.

enable_hashjoin

Dynamic

Enables the planner's use of hash join plans.

enable_indexscan

Dynamic

Enables the planner's use of index-scan plans.

enable_material

Dynamic

Enables the planner's use of materialization.

enable_mergejoin

Dynamic

Enables the planner's use of merge join plans.

enable_nestloop

Dynamic

Enables the planner's use of nested-loop join plans.

enable_seqscan

Dynamic

Enables the planner's use of sequential-scan plans.

enable_sort

Dynamic

Enables the planner's use of explicit sort steps.

enable_tidscan

Dynamic

Enables the planner's use of TID scan plans.

escape_string_warning

Dynamic

Warns about backslash (\) escapes in ordinary string literals.

extra_float_digits

Dynamic

Sets the number of digits displayed for floating-point values.

from_collapse_limit

Dynamic

Sets the FROM-list size beyond which subqueries are not collapsed.

fsync

Dynamic

Forces synchronization of updates to disk.

full_page_writes

Dynamic

Writes full pages to WAL when first modified after a checkpoint.

geqo

Dynamic

Enables genetic query optimization.

geqo_effort

Dynamic

GEQO: effort is used to set the default for other GEQO parameters.

geqo_generations

Dynamic

GEQO: number of iterations of the algorithm.

geqo_pool_size

Dynamic

GEQO: number of individuals in the population.

geqo_seed

Dynamic

GEQO: seed for random path selection.

geqo_selection_bias

Dynamic

GEQO: selective pressure within the population.

geqo_threshold

Dynamic

Sets the threshold of FROM items beyond which GEQO is used.

gin_fuzzy_search_limit

Dynamic

Sets the maximum allowed result for exact search by GIN.

hot_standby_feedback

Dynamic

Determines whether a hot standby sends feedback messages to the primary or upstream standby.

intervalstyle

Dynamic

Sets the display format for interval values.

join_collapse_limit

Dynamic

Sets the FROM-list size beyond which JOIN constructs are not flattened.

lc_messages

Dynamic

Sets the language in which messages are displayed.

lc_monetary

Dynamic

Sets the locale for formatting monetary amounts.

lc_numeric

Dynamic

Sets the locale for formatting numbers.

lc_time

Dynamic

Sets the locale for formatting date and time values.

log_autovacuum_min_duration

Dynamic

Sets the minimum running time above which autovacuum actions will be logged.

log_checkpoints

Dynamic

Logs each checkpoint.

log_connections

Dynamic

Logs each successful connection.

log_disconnections

Dynamic

Logs end of a session, including duration.

log_duration

Dynamic

Logs the duration of each completed SQL statement.

log_error_verbosity

Dynamic

Sets the verbosity of logged messages.

log_executor_stats

Dynamic

Writes executor performance statistics to the server log.

log_filename

Dynamic

Sets the file name pattern for log files.

log_file_mode

Dynamic

Sets file permissions for log files. Default value is 0644.

log_hostname

Dynamic

Logs the host name in the connection logs. As of PostgreSQL 12 and later versions, this parameter is 'off' by default. When turned on, the connection uses DNS reverse-lookup to get the hostname that gets captured to the connection logs. If you turn on this parameter, you should monitor the impact that it has on the time it takes to establish connections.

log_line_prefix

Dynamic

Controls information prefixed to each log line.

log_lock_waits

Dynamic

Logs long lock waits.

log_min_duration_statement

Dynamic

Sets the minimum running time above which statements will be logged.

log_min_error_statement

Dynamic

Causes all statements generating an error at or above this level to be logged.

log_min_messages

Dynamic

Sets the message levels that are logged.

log_parser_stats

Dynamic

Writes parser performance statistics to the server log.

log_planner_stats

Dynamic

Writes planner performance statistics to the server log.

log_rotation_age

Dynamic

Automatic log file rotation will occur after N minutes.

log_rotation_size

Dynamic

Automatic log file rotation will occur after N kilobytes.

log_statement

Dynamic

Sets the type of statements logged.

log_statement_stats

Dynamic

Writes cumulative performance statistics to the server log.

log_temp_files

Dynamic

Logs the use of temporary files larger than this number of kilobytes.

log_timezone

Dynamic

Sets the time zone to use in log messages.

log_truncate_on_rotation

Dynamic

Truncate existing log files of same name during log rotation.

logging_collector

Static

Start a subprocess to capture stderr output and/or csvlogs into log files.

maintenance_work_mem

Dynamic

Sets the maximum memory to be used for maintenance operations.

max_connections

Static

Sets the maximum number of concurrent connections.

max_files_per_process

Static

Sets the maximum number of simultaneously open files for each server process.

max_locks_per_transaction

Static

Sets the maximum number of locks per transaction.

max_pred_locks_per_transaction

Static

Sets the maximum number of predicate locks per transaction.

max_prepared_transactions

Static

Sets the maximum number of simultaneously prepared transactions.

max_stack_depth

Dynamic

Sets the maximum stack depth, in kilobytes.

max_standby_archive_delay

Dynamic

Sets the maximum delay before canceling queries when a hot standby server is processing archived WAL data.

max_standby_streaming_delay

Dynamic

Sets the maximum delay before canceling queries when a hot standby server is processing streamed WAL data.

max_wal_size

Dynamic

Sets the WAL size (MB) that triggers a checkpoint.

Use the following command on your Amazon RDS for PostgreSQL DB instance to see its current value:

SHOW max_wal_size;

min_wal_size

Dynamic

Sets the minimum size to shrink the WAL to. For PostgreSQL version 9.6 and earlier, min_wal_size is in units of 16 MB. For PostgreSQL version 10 and later, min_wal_size is in units of 1 MB.

quote_all_identifiers

Dynamic

Adds quotes (") to all identifiers when generating SQL fragments.

random_page_cost

Dynamic

Sets the planner's estimate of the cost of a non-sequentially fetched disk page. This parameter has no value unless query plan management (QPM) is turned on. When QPM is on, the default value for this parameter 4.

rds.adaptive_autovacuum

Dynamic

Automatically tunes the autovacuum parameters whenever the transaction ID thresholds are exceeded.

rds.force_ssl

Dynamic

Requires the use of SSL connections. The default value is set to 1 (on) for RDS for PostgreSQL version 15. All other RDS for PostgreSQL major version 14 and older have the default value set to 0 (off).

rds.local_volume_spill_enabled

Static

Enables writing logical spill files to the local volume.

rds.log_retention_period

Dynamic

Sets log retention such that Amazon RDS deletes PostgreSQL logs that are older than_n_ minutes.

rds.rds_superuser_reserved_connections

Static

Sets the number of connection slots reserved for rds_superusers. This parameter is only available in versions 15 and earlier. For more information, see the PostgreSQL documentation reserved_connections.

rds.replica_identity_full

Dynamic

When you set this parameter to on, it overrides the replica identity setting to FULL for all database tables. This means all column values are written to the write ahead log (WAL), regardless of yourREPLICA IDENTITY FULL settings.

Note

Turning on this parameter may increase your database instance IOPS due to the additional WAL logging.

rds.restrict_password_commands

Static

Restricts who can manage passwords to users with the rds_password role. Set this parameter to 1 to enable password restriction. The default is 0.

search_path

Dynamic

Sets the schema search order for names that are not schema-qualified.

seq_page_cost

Dynamic

Sets the planner's estimate of the cost of a sequentially fetched disk page.

session_replication_role

Dynamic

Sets the sessions behavior for triggers and rewrite rules.

shared_buffers

Static

Sets the number of shared memory buffers used by the server.

shared_preload_libraries

Static

Lists the shared libraries to preload into the RDS for PostgreSQL DB instance. Supported values include auto_explain, orafce, pgaudit, pglogical, pg_bigm, pg_cron, pg_hint_plan, pg_prewarm, pg_similarity, pg_stat_statements, pg_tle, pg_transport, plprofiler, and plrust.

ssl

Dynamic

Enables SSL connections.

sql_inheritance

Dynamic

Causes subtables to be included by default in various commands.

ssl_renegotiation_limit

Dynamic

Sets the amount of traffic to send and receive before renegotiating the encryption keys.

standard_conforming_strings

Dynamic

Causes ... strings to treat backslashes literally.

statement_timeout

Dynamic

Sets the maximum allowed duration of any statement.

synchronize_seqscans

Dynamic

Enables synchronized sequential scans.

synchronous_commit

Dynamic

Sets the current transactions synchronization level.

tcp_keepalives_count

Dynamic

Maximum number of TCP keepalive retransmits.

tcp_keepalives_idle

Dynamic

Time between issuing TCP keepalives.

tcp_keepalives_interval

Dynamic

Time between TCP keepalive retransmits.

temp_buffers

Dynamic

Sets the maximum number of temporary buffers used by each session.

temp_file_limit

Dynamic

Sets the maximum size in KB to which the temporary files can grow.

temp_tablespaces

Dynamic

Sets the tablespaces to use for temporary tables and sort files.

timezone

Dynamic

Sets the time zone for displaying and interpreting time stamps.

The Internet Assigned Numbers Authority (IANA) publishes new time zones at https://www.iana.org/time-zones several times a year. Every time RDS releases a new minor maintenance release of PostgreSQL, it ships with the latest time zone data at the time of the release. When you use the latest RDS for PostgreSQL versions, you have recent time zone data from RDS. To ensure that your DB instance has recent time zone data, we recommend upgrading to a higher DB engine version. You can't modify the time zone tables in PostgreSQL DB instances manually. RDS doesn't modify or reset the time zone data of running DB instances. New time zone data is installed only when you perform a database engine version upgrade.

track_activities

Dynamic

Collects information about running commands.

track_activity_query_size

Static

Sets the size reserved for pg_stat_activity.current_query, in bytes.

track_counts

Dynamic

Collects statistics on database activity.

track_functions

Dynamic

Collects function-level statistics on database activity.

track_io_timing

Dynamic

Collects timing statistics on database I/O activity.

transaction_deferrable

Dynamic

Indicates whether to defer a read-only serializable transaction until it can be started with no possible serialization failures.

transaction_isolation

Dynamic

Sets the current transactions isolation level.

transaction_read_only

Dynamic

Sets the current transactions read-only status.

transform_null_equals

Dynamic

Treats expr=NULL as expr IS NULL.

update_process_title

Dynamic

Updates the process title to show the active SQL command.

vacuum_cost_delay

Dynamic

Vacuum cost delay in milliseconds.

vacuum_cost_limit

Dynamic

Vacuum cost amount available before napping.

vacuum_cost_page_dirty

Dynamic

Vacuum cost for a page dirtied by vacuum.

vacuum_cost_page_hit

Dynamic

Vacuum cost for a page found in the buffer cache.

vacuum_cost_page_miss

Dynamic

Vacuum cost for a page not found in the buffer cache.

vacuum_defer_cleanup_age

Dynamic

Number of transactions by which vacuum and hot cleanup should be deferred, if any.

vacuum_freeze_min_age

Dynamic

Minimum age at which vacuum should freeze a table row.

vacuum_freeze_table_age

Dynamic

Age at which vacuum should scan a whole table to freeze tuples.

wal_buffers

Static

Sets the number of disk-page buffers in shared memory for WAL.

wal_writer_delay

Dynamic

WAL writer sleep time between WAL flushes.

work_mem

Dynamic

Sets the maximum memory to be used for query workspaces.

xmlbinary

Dynamic

Sets how binary values are to be encoded in XML.

xmloption

Dynamic

Sets whether XML data in implicit parsing and serialization operations is to be considered as documents or content fragments.