Thanks guys, First of all, I should have included my postgres.conf file with the original submission. Sorry about that. It is now attached. Based on a recommendation, I also should have shown the parent child relationship between osmoduleloads and its daily partitioned tables. to reduce clutter, It is at the end of this message. Taking this one step at a time and taking Greg's second suggestion first, issuing select * from osmoduleloads WHERE osmoduleloads.firstloadtime >= 129604320000000000 AND osmoduleloads.firstloadtime < 129610367990000000; appears to only query the appropriate daily tables (2011_09_13 through 2011_09_20 - http://explain.depesz.com/s/QCG). So it appears that constraint_exclusion is working properly. Putting a limit on the query like: select * from osmoduleloads WHERE osmoduleloads.firstloadtime >= 129604320000000000 AND osmoduleloads.firstloadtime < 129610367990000000 limit 251; has the result that I'd expect to see http://explain.depesz.com/s/O7fZ. Ordering by firstloadtime AND limiting like: select * from osmoduleloads WHERE osmoduleloads.firstloadtime >= 129604320000000000 AND osmoduleloads.firstloadtime < 129610367990000000 order by firstloadtime desc limit 251; also has the result that I'd expect to see http://explain.depesz.com/s/RDh. Adding the hosts join condition to the mix was still OK http://explain.depesz.com/s/2Ns. Adding the hosts.enabled condition was still OK http://explain.depesz.com/s/UYN. Adding the hosts.user_id = 111 started the descent but it appears to still be obeying the proper contraint_exclusion that I'd expect, just with a ton of rows returned from the most recent daily tables http://explain.depesz.com/s/4WE. Adding the final condition hosts_guid = '2007075705813916178' is what ultimately kills it http://explain.depesz.com/s/8zy. By adding the host_guid, it spends considerably more time in the older tables than without this condition and I'm not sure why. Thanks Greg for the recommendation to step through it like that - hopefully this helps get us closer to a resolution. Greg/Tom, you are correct, these columns should be modified to whatever is easiest for Postgres to recognize 64-bit unsigned integers. Would you still recommend bigint for unsigned integers? I likely read the wrong documentation that suggested bigint for signed 64-bit integers and numeric(20) for unsigned 64-bit integers. Thanks again for all your help! Perhaps 15 hours of pouring over explain logs will finally pan out! Mike cb=# \d+ osmoduleloads; Table "public.osmoduleloads" Column | Type | Modifiers | Storage | Description -----------------------+-----------------------------+-----------------------+----------+------------- guid | numeric(20,0) | not null | main | osprocess_guid | numeric(20,0) | not null | main | filepath_guid | numeric(20,0) | not null | main | firstloadtime | numeric(20,0) | not null | main | md5hash | bytea | not null | extended | host_guid | numeric(20,0) | default NULL::numeric | main | process_create_time | numeric(20,0) | default NULL::numeric | main | process_filepath_guid | numeric(20,0) | default NULL::numeric | main | event_time | timestamp without time zone | | plain | Indexes: "osmoduleloads_pkey" PRIMARY KEY, btree (guid) Child tables: osmoduleloads_2001_12_31, osmoduleloads_2010_10_11, osmoduleloads_2010_10_12, osmoduleloads_2010_10_13, osmoduleloads_2011_07_27, osmoduleloads_2011_08_04, osmoduleloads_2011_08_05, osmoduleloads_2011_08_06, osmoduleloads_2011_08_07, osmoduleloads_2011_08_08, osmoduleloads_2011_08_09, osmoduleloads_2011_08_10, osmoduleloads_2011_08_11, osmoduleloads_2011_08_12, osmoduleloads_2011_08_13, osmoduleloads_2011_08_14, osmoduleloads_2011_08_15, osmoduleloads_2011_08_16, osmoduleloads_2011_08_17, osmoduleloads_2011_08_18, osmoduleloads_2011_08_19, osmoduleloads_2011_08_20, osmoduleloads_2011_08_21, osmoduleloads_2011_08_22, osmoduleloads_2011_08_23, osmoduleloads_2011_08_24, osmoduleloads_2011_08_25, osmoduleloads_2011_08_26, osmoduleloads_2011_08_27, osmoduleloads_2011_08_28, osmoduleloads_2011_08_29, osmoduleloads_2011_08_30, osmoduleloads_2011_08_31, osmoduleloads_2011_09_01, osmoduleloads_2011_09_02, osmoduleloads_2011_09_03, osmoduleloads_2011_09_04, osmoduleloads_2011_09_05, osmoduleloads_2011_09_06, osmoduleloads_2011_09_07, osmoduleloads_2011_09_08, osmoduleloads_2011_09_09, osmoduleloads_2011_09_10, osmoduleloads_2011_09_11, osmoduleloads_2011_09_12, osmoduleloads_2011_09_13, osmoduleloads_2011_09_14, osmoduleloads_2011_09_15, osmoduleloads_2011_09_16, osmoduleloads_2011_09_17, osmoduleloads_2011_09_18, osmoduleloads_2011_09_19, osmoduleloads_2011_09_20, osmoduleloads_2011_12_01 Has OIDs: no On 9/21/2011 10:09 PM, Tom Lane wrote: > Greg Smith <greg@xxxxxxxxxxxxxxx> writes: >> That weird casting can't be helping. I'm not sure if it's your problem >> here, but the constraint exclusion code is pretty picky about matching >> the thing you're looking for against the CHECK constraint, and this is a >> messy one. The bigint conversion in the middle there isn't doing >> anything useful for you anyway; you really should simplify this to just >> look like this: >> firstloadtime >= 129604464000000000::numeric > I have a more aggressive suggestion: change all the numeric(20,0) fields > to bigint. Unless the OP actually needs values wider than 64 bits, > the choice to use numeric is a significant performance penalty for > nothing. > > regards, tom lane >
# ----------------------------- # PostgreSQL configuration file # ----------------------------- # # This file consists of lines of the form: # # name = value # # (The "=" is optional.) Whitespace may be used. Comments are introduced with # "#" anywhere on a line. The complete list of parameter names and allowed # values can be found in the PostgreSQL documentation. # # The commented-out settings shown in this file represent the default values. # Re-commenting a setting is NOT sufficient to revert it to the default value; # you need to reload the server. # # This file is read on server startup and when the server receives a SIGHUP # signal. If you edit the file on a running system, you have to SIGHUP the # server for the changes to take effect, or use "pg_ctl reload". Some # parameters, which are marked below, require a server shutdown and restart to # take effect. # # Any parameter can also be given as a command-line option to the server, e.g., # "postgres -c log_connections=on". Some parameters can be changed at run time # with the "SET" SQL command. # # Memory units: kB = kilobytes Time units: ms = milliseconds # MB = megabytes s = seconds # GB = gigabytes min = minutes # h = hours # d = days #------------------------------------------------------------------------------ # FILE LOCATIONS #------------------------------------------------------------------------------ # The default values of these variables are driven from the -D command-line # option or PGDATA environment variable, represented here as ConfigDir. #data_directory = 'ConfigDir' # use data in another directory # (change requires restart) #hba_file = 'ConfigDir/pg_hba.conf' # host-based authentication file # (change requires restart) #ident_file = 'ConfigDir/pg_ident.conf' # ident configuration file # (change requires restart) # If external_pid_file is not explicitly set, no extra PID file is written. #external_pid_file = '(none)' # write an extra PID file # (change requires restart) #------------------------------------------------------------------------------ # CONNECTIONS AND AUTHENTICATION #------------------------------------------------------------------------------ # - Connection Settings - listen_addresses = '127.0.0.1' # what IP address(es) to listen on; # comma-separated list of addresses; # defaults to 'localhost', '*' = all # (change requires restart) port = 54320 # (change requires restart) max_connections = 100 # (change requires restart) # Note: Increasing max_connections costs ~400 bytes of shared memory per # connection slot, plus lock space (see max_locks_per_transaction). #superuser_reserved_connections = 3 # (change requires restart) #unix_socket_directory = '' # (change requires restart) #unix_socket_group = '' # (change requires restart) #unix_socket_permissions = 0777 # begin with 0 to use octal notation # (change requires restart) #bonjour = off # advertise server via Bonjour # (change requires restart) #bonjour_name = '' # defaults to the computer name # (change requires restart) # - Security and Authentication - #authentication_timeout = 1min # 1s-600s #ssl = off # (change requires restart) #ssl_ciphers = 'ALL:!ADH:!LOW:!EXP:!MD5:@STRENGTH' # allowed SSL ciphers # (change requires restart) #ssl_renegotiation_limit = 512MB # amount of data between renegotiations #password_encryption = on #db_user_namespace = off # Kerberos and GSSAPI #krb_server_keyfile = '' #krb_srvname = 'postgres' # (Kerberos only) #krb_caseins_users = off # - TCP Keepalives - # see "man 7 tcp" for details #tcp_keepalives_idle = 0 # TCP_KEEPIDLE, in seconds; # 0 selects the system default #tcp_keepalives_interval = 0 # TCP_KEEPINTVL, in seconds; # 0 selects the system default #tcp_keepalives_count = 0 # TCP_KEEPCNT; # 0 selects the system default #------------------------------------------------------------------------------ # RESOURCE USAGE (except WAL) #------------------------------------------------------------------------------ # - Memory - shared_buffers = 512MB # min 128kB # (change requires restart) #temp_buffers = 8MB # min 800kB #max_prepared_transactions = 0 # zero disables the feature # (change requires restart) # Note: Increasing max_prepared_transactions costs ~600 bytes of shared memory # per transaction slot, plus lock space (see max_locks_per_transaction). # It is not advisable to set max_prepared_transactions nonzero unless you # actively intend to use prepared transactions. work_mem = 16MB # min 64kB maintenance_work_mem = 256MB # min 1MB #max_stack_depth = 2MB # min 100kB # - Kernel Resource Usage - #max_files_per_process = 1000 # min 25 # (change requires restart) shared_preload_libraries = 'auto_explain' # (change requires restart) custom_variable_classes = 'auto_explain' auto_explain.log_min_duration = '10' auto_explain.log_analyze = 'on' # - Cost-Based Vacuum Delay - #vacuum_cost_delay = 0ms # 0-100 milliseconds #vacuum_cost_page_hit = 1 # 0-10000 credits #vacuum_cost_page_miss = 10 # 0-10000 credits #vacuum_cost_page_dirty = 20 # 0-10000 credits #vacuum_cost_limit = 200 # 1-10000 credits # - Background Writer - #bgwriter_delay = 200ms # 10-10000ms between rounds #bgwriter_lru_maxpages = 100 # 0-1000 max buffers written/round #bgwriter_lru_multiplier = 2.0 # 0-10.0 multipler on buffers scanned/round # - Asynchronous Behavior - #effective_io_concurrency = 1 # 1-1000. 0 disables prefetching #------------------------------------------------------------------------------ # WRITE AHEAD LOG #------------------------------------------------------------------------------ # - Settings - #wal_level = minimal # minimal, archive, or hot_standby # (change requires restart) #fsync = on # turns forced synchronization on or off synchronous_commit = off # synchronization level; on, off, or local wal_sync_method = open_datasync #fsync # the default is the first option # supported by the operating system: # open_datasync # fdatasync (default on Linux) # fsync # fsync_writethrough # open_sync #full_page_writes = on # recover from partial page writes #wal_buffers = -1 # min 32kB, -1 sets based on shared_buffers # (change requires restart) #wal_writer_delay = 200ms # 1-10000 milliseconds #commit_delay = 0 # range 0-100000, in microseconds #commit_siblings = 5 # range 1-1000 # - Checkpoints - checkpoint_segments = 16 # in logfile segments, min 1, 16MB each checkpoint_timeout = 1h # range 30s-1h checkpoint_completion_target = 0.9 # checkpoint target duration, 0.0 - 1.0 #checkpoint_warning = 30s # 0 disables # - Archiving - #archive_mode = off # allows archiving to be done # (change requires restart) #archive_command = '' # command to use to archive a logfile segment #archive_timeout = 0 # force a logfile segment switch after this # number of seconds; 0 disables #------------------------------------------------------------------------------ # REPLICATION #------------------------------------------------------------------------------ # - Master Server - # These settings are ignored on a standby server #max_wal_senders = 0 # max number of walsender processes # (change requires restart) #wal_sender_delay = 1s # walsender cycle time, 1-10000 milliseconds #wal_keep_segments = 0 # in logfile segments, 16MB each; 0 disables #vacuum_defer_cleanup_age = 0 # number of xacts by which cleanup is delayed #replication_timeout = 60s # in milliseconds; 0 disables #synchronous_standby_names = '' # standby servers that provide sync rep # comma-separated list of application_name # from standby(s); '*' = all # - Standby Servers - # These settings are ignored on a master server #hot_standby = off # "on" allows queries during recovery # (change requires restart) #max_standby_archive_delay = 30s # max delay before canceling queries # when reading WAL from archive; # -1 allows indefinite delay #max_standby_streaming_delay = 30s # max delay before canceling queries # when reading streaming WAL; # -1 allows indefinite delay #wal_receiver_status_interval = 10s # send replies at least this often # 0 disables #hot_standby_feedback = off # send info from standby to prevent # query conflicts #------------------------------------------------------------------------------ # QUERY TUNING #------------------------------------------------------------------------------ # - Planner Method Configuration - #enable_bitmapscan = on #enable_hashagg = on #enable_hashjoin = on #enable_indexscan = on #enable_material = on #enable_mergejoin = on #enable_nestloop = on #enable_seqscan = on #enable_sort = on #enable_tidscan = on # - Planner Cost Constants - #seq_page_cost = 1.0 # measured on an arbitrary scale #random_page_cost = 4.0 # same scale as above #cpu_tuple_cost = 0.01 # same scale as above #cpu_index_tuple_cost = 0.005 # same scale as above #cpu_operator_cost = 0.0025 # same scale as above effective_cache_size = 3062MB # - Genetic Query Optimizer - #geqo = on #geqo_threshold = 12 #geqo_effort = 5 # range 1-10 #geqo_pool_size = 0 # selects default based on effort #geqo_generations = 0 # selects default based on effort #geqo_selection_bias = 2.0 # range 1.5-2.0 #geqo_seed = 0.0 # range 0.0-1.0 # - Other Planner Options - #default_statistics_target = 100 # range 1-10000 #constraint_exclusion = partition # on, off, or partition #cursor_tuple_fraction = 0.1 # range 0.0-1.0 #from_collapse_limit = 8 #join_collapse_limit = 8 # 1 disables collapsing of explicit # JOIN clauses #------------------------------------------------------------------------------ # ERROR REPORTING AND LOGGING #------------------------------------------------------------------------------ # - Where to Log - #log_destination = 'stderr' # Valid values are combinations of # stderr, csvlog, syslog, and eventlog, # depending on platform. csvlog # requires logging_collector to be on. # This is used when logging to stderr: logging_collector = on # Enable capturing of stderr and csvlog # into log files. Required to be on for # csvlogs. # (change requires restart) # These are only used if logging_collector is on: #log_directory = 'pg_log' # directory where log files are written, # can be absolute or relative to PGDATA #log_filename = 'postgresql-%Y-%m-%d_%H%M%S.log' # log file name pattern, # can include strftime() escapes #log_file_mode = 0600 # creation mode for log files, # begin with 0 to use octal notation #log_truncate_on_rotation = off # If on, an existing log file with the # same name as the new log file will be # truncated rather than appended to. # But such truncation only occurs on # time-driven rotation, not on restarts # or size-driven rotation. Default is # off, meaning append to existing files # in all cases. #log_rotation_age = 1d # Automatic rotation of logfiles will # happen after that time. 0 disables. #log_rotation_size = 10MB # Automatic rotation of logfiles will # happen after that much log output. # 0 disables. # These are relevant when logging to syslog: #syslog_facility = 'LOCAL0' #syslog_ident = 'postgres' #silent_mode = off # Run server silently. # DO NOT USE without syslog or # logging_collector # (change requires restart) # - When to Log - #client_min_messages = notice # values in order of decreasing detail: # debug5 # debug4 # debug3 # debug2 # debug1 # log # notice # warning # error #log_min_messages = warning # values in order of decreasing detail: # debug5 # debug4 # debug3 # debug2 # debug1 # info # notice # warning # error # log # fatal # panic #log_min_error_statement = error # values in order of decreasing detail: # debug5 # debug4 # debug3 # debug2 # debug1 # info # notice # warning # error # log # fatal # panic (effectively off) #log_min_duration_statement = -1 # -1 is disabled, 0 logs all statements # and their durations, > 0 logs only # statements running at least this number # of milliseconds # - What to Log - #debug_print_parse = off #debug_print_rewritten = off #debug_print_plan = off #debug_pretty_print = on log_checkpoints = on #log_connections = off #log_disconnections = off #log_duration = off #log_error_verbosity = default # terse, default, or verbose messages #log_hostname = off log_line_prefix = '%m - %p ' # special values: # %a = application name # %u = user name # %d = database name # %r = remote host and port # %h = remote host # %p = process ID # %t = timestamp without milliseconds # %m = timestamp with milliseconds # %i = command tag # %e = SQL state # %c = session ID # %l = session line number # %s = session start timestamp # %v = virtual transaction ID # %x = transaction ID (0 if none) # %q = stop here in non-session # processes # %% = '%' # e.g. '<%u%%%d> ' log_lock_waits = off # log lock waits >= deadlock_timeout #log_statement = 'none' # none, ddl, mod, all #log_temp_files = -1 # log temporary files equal or larger # than the specified size in kilobytes; # -1 disables, 0 logs all temp files #log_timezone = '(defaults to server environment setting)' #------------------------------------------------------------------------------ # RUNTIME STATISTICS #------------------------------------------------------------------------------ # - Query/Index Statistics Collector - #track_activities = on #track_counts = on #track_functions = none # none, pl, all #track_activity_query_size = 1024 # (change requires restart) #update_process_title = on #stats_temp_directory = 'pg_stat_tmp' # - Statistics Monitoring - #log_parser_stats = off #log_planner_stats = off #log_executor_stats = off #log_statement_stats = off #------------------------------------------------------------------------------ # AUTOVACUUM PARAMETERS #------------------------------------------------------------------------------ #autovacuum = on # Enable autovacuum subprocess? 'on' # requires track_counts to also be on. #log_autovacuum_min_duration = -1 # -1 disables, 0 logs all actions and # their durations, > 0 logs only # actions running at least this number # of milliseconds. #autovacuum_max_workers = 3 # max number of autovacuum subprocesses # (change requires restart) #autovacuum_naptime = 1min # time between autovacuum runs #autovacuum_vacuum_threshold = 50 # min number of row updates before # vacuum #autovacuum_analyze_threshold = 50 # min number of row updates before # analyze #autovacuum_vacuum_scale_factor = 0.2 # fraction of table size before vacuum #autovacuum_analyze_scale_factor = 0.1 # fraction of table size before analyze #autovacuum_freeze_max_age = 200000000 # maximum XID age before forced vacuum # (change requires restart) #autovacuum_vacuum_cost_delay = 20ms # default vacuum cost delay for # autovacuum, in milliseconds; # -1 means use vacuum_cost_delay #autovacuum_vacuum_cost_limit = -1 # default vacuum cost limit for # autovacuum, -1 means use # vacuum_cost_limit #------------------------------------------------------------------------------ # CLIENT CONNECTION DEFAULTS #------------------------------------------------------------------------------ # - Statement Behavior - #search_path = '"$user",public' # schema names #default_tablespace = '' # a tablespace name, '' uses the default #temp_tablespaces = '' # a list of tablespace names, '' uses # only default tablespace #check_function_bodies = on #default_transaction_isolation = 'read committed' #default_transaction_read_only = off #default_transaction_deferrable = off #session_replication_role = 'origin' #statement_timeout = 0 # in milliseconds, 0 is disabled #vacuum_freeze_min_age = 50000000 #vacuum_freeze_table_age = 150000000 #bytea_output = 'hex' # hex, escape #xmlbinary = 'base64' #xmloption = 'content' # - Locale and Formatting - datestyle = 'iso, mdy' #intervalstyle = 'postgres' timezone = 'GMT' #(defaults to server environment setting)' #timezone_abbreviations = 'Default' # Select the set of available time zone # abbreviations. Currently, there are # Default # Australia # India # You can create your own file in # share/timezonesets/. #extra_float_digits = 0 # min -15, max 3 #client_encoding = sql_ascii # actually, defaults to database # encoding # These settings are initialized by initdb, but they can be changed. lc_messages = 'English_United States.1252' # locale for system error message # strings lc_monetary = 'English_United States.1252' # locale for monetary formatting lc_numeric = 'English_United States.1252' # locale for number formatting lc_time = 'English_United States.1252' # locale for time formatting # default configuration for text search default_text_search_config = 'pg_catalog.english' # - Other Defaults - #dynamic_library_path = '$libdir' #local_preload_libraries = '' #------------------------------------------------------------------------------ # LOCK MANAGEMENT #------------------------------------------------------------------------------ deadlock_timeout = 600s #max_locks_per_transaction = 64 # min 10 # (change requires restart) # Note: Each lock table slot uses ~270 bytes of shared memory, and there are # max_locks_per_transaction * (max_connections + max_prepared_transactions) # lock table slots. #max_pred_locks_per_transaction = 64 # min 10 # (change requires restart) #------------------------------------------------------------------------------ # VERSION/PLATFORM COMPATIBILITY #------------------------------------------------------------------------------ # - Previous PostgreSQL Versions - #array_nulls = on #backslash_quote = safe_encoding # on, off, or safe_encoding #default_with_oids = off escape_string_warning = off #lo_compat_privileges = off #quote_all_identifiers = off #sql_inheritance = on #standard_conforming_strings = on #synchronize_seqscans = on # - Other Platforms and Clients - #transform_null_equals = off #------------------------------------------------------------------------------ # ERROR HANDLING #------------------------------------------------------------------------------ #exit_on_error = off # terminate session on any error? #restart_after_crash = on # reinitialize after backend crash? #------------------------------------------------------------------------------ # CUSTOMIZED OPTIONS #------------------------------------------------------------------------------ #custom_variable_classes = '' # list of custom variable class names
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