Attached Thank you On Thu, Jun 10, 2010 at 6:28 AM, Robert Haas <robertmhaas@xxxxxxxxx> wrote: > On Wed, Jun 9, 2010 at 11:17 PM, Anj Adu <fotographs@xxxxxxxxx> wrote: >> The plan is unaltered . There is a separate index on theDate as well >> as one on node_id >> >> I have not specifically disabled sequential scans. > > Please do "SHOW ALL" and attach the results as a text file. > >> This query performs much better on 8.1.9 on a similar sized >> table.(althought the random_page_cost=4 on 8.1.9 and 2 on 8.4.0 ) > > Well that could certainly matter... > > -- > Robert Haas > EnterpriseDB: http://www.enterprisedb.com > The Enterprise Postgres Company >
add_missing_from | off | Automatically adds missing table references to FROM clauses. allow_system_table_mods | off | Allows modifications of the structure of system tables. archive_command | (disabled) | Sets the shell command that will be called to archive a WAL file. archive_mode | off | Allows archiving of WAL files using archive_command. archive_timeout | 0 | Forces a switch to the next xlog file if a new file has not been started within N seconds. array_nulls | on | Enable input of NULL elements in arrays. authentication_timeout | 1min | Sets the maximum allowed time to complete client authentication. autovacuum | on | Starts the autovacuum subprocess. autovacuum_analyze_scale_factor | 0.1 | Number of tuple inserts, updates or deletes prior to analyze as a fraction of reltuples. autovacuum_analyze_threshold | 50 | Minimum number of tuple inserts, updates or deletes prior to analyze. autovacuum_freeze_max_age | 200000000 | Age at which to autovacuum a table to prevent transaction ID wraparound. autovacuum_max_workers | 3 | Sets the maximum number of simultaneously running autovacuum worker processes. autovacuum_naptime | 7d | Time to sleep between autovacuum runs. autovacuum_vacuum_cost_delay | 50ms | Vacuum cost delay in milliseconds, for autovacuum. autovacuum_vacuum_cost_limit | -1 | Vacuum cost amount available before napping, for autovacuum. autovacuum_vacuum_scale_factor | 0.2 | Number of tuple updates or deletes prior to vacuum as a fraction of reltuples. autovacuum_vacuum_threshold | 1000 | Minimum number of tuple updates or deletes prior to vacuum. backslash_quote | safe_encoding | Sets whether "\'" is allowed in string literals. bgwriter_delay | 200ms | Background writer sleep time between rounds. bgwriter_lru_maxpages | 100 | Background writer maximum number of LRU pages to flush per round. bgwriter_lru_multiplier | 2 | Multiple of the average buffer usage to free per round. block_size | 8192 | Shows the size of a disk block. bonjour_name | | Sets the Bonjour broadcast service name. check_function_bodies | on | Check function bodies during CREATE FUNCTION. checkpoint_completion_target | 0.5 | Time spent flushing dirty buffers during checkpoint, as fraction of checkpoint interval. checkpoint_segments | 128 | Sets the maximum distance in log segments between automatic WAL checkpoints. checkpoint_timeout | 5min | Sets the maximum time between automatic WAL checkpoints. checkpoint_warning | 30s | Enables warnings if checkpoint segments are filled more frequently than this. client_encoding | UTF8 | Sets the client's character set encoding. client_min_messages | notice | Sets the message levels that are sent to the client. commit_delay | 0 | Sets the delay in microseconds between transaction commit and flushing WAL to disk. commit_siblings | 5 | Sets the minimum concurrent open transactions before performing commit_delay. constraint_exclusion | partition | Enables the planner to use constraints to optimize queries. cpu_index_tuple_cost | 0.005 | Sets the planner's estimate of the cost of processing each index entry during an index scan. cpu_operator_cost | 0.0025 | Sets the planner's estimate of the cost of processing each operator or function call. cpu_tuple_cost | 0.01 | Sets the planner's estimate of the cost of processing each tuple (row). cursor_tuple_fraction | 0.1 | Sets the planner's estimate of the fraction of a cursor's rows that will be retrieved. custom_variable_classes | | Sets the list of known custom variable classes. DateStyle | ISO, MDY | Sets the display format for date and time values. db_user_namespace | off | Enables per-database user names. deadlock_timeout | 1s | Sets the time to wait on a lock before checking for deadlock. debug_assertions | off | Turns on various assertion checks. debug_pretty_print | on | Indents parse and plan tree displays. debug_print_parse | off | Logs each query's parse tree. debug_print_plan | off | Logs each query's execution plan. debug_print_rewritten | off | Logs each query's rewritten parse tree. default_statistics_target | 1000 | Sets the default statistics target. default_tablespace | | Sets the default tablespace to create tables and indexes in. default_text_search_config | pg_catalog.english | Sets default text search configuration. default_transaction_isolation | read committed | Sets the transaction isolation level of each new transaction. default_transaction_read_only | off | Sets the default read-only status of new transactions. default_with_oids | off | Create new tables with OIDs by default. effective_cache_size | 20GB | Sets the planner's assumption about the size of the disk cache. effective_io_concurrency | 1 | Number of simultaneous requests that can be handled efficiently by the disk subsystem. enable_bitmapscan | on | Enables the planner's use of bitmap-scan plans. enable_hashagg | on | Enables the planner's use of hashed aggregation plans. enable_hashjoin | on | Enables the planner's use of hash join plans. enable_indexscan | on | Enables the planner's use of index-scan plans. enable_mergejoin | on | Enables the planner's use of merge join plans. enable_nestloop | on | Enables the planner's use of nested-loop join plans. enable_seqscan | on | Enables the planner's use of sequential-scan plans. enable_sort | on | Enables the planner's use of explicit sort steps. enable_tidscan | on | Enables the planner's use of TID scan plans. escape_string_warning | on | Warn about backslash escapes in ordinary string literals. extra_float_digits | 0 | Sets the number of digits displayed for floating-point values. from_collapse_limit | 8 | Sets the FROM-list size beyond which subqueries are not collapsed. fsync | on | Forces synchronization of updates to disk. full_page_writes | on | Writes full pages to WAL when first modified after a checkpoint. geqo | on | Enables genetic query optimization. geqo_effort | 5 | GEQO: effort is used to set the default for other GEQO parameters. geqo_generations | 0 | GEQO: number of iterations of the algorithm. geqo_pool_size | 0 | GEQO: number of individuals in the population. geqo_selection_bias | 2 | GEQO: selective pressure within the population. geqo_threshold | 12 | Sets the threshold of FROM items beyond which GEQO is used. gin_fuzzy_search_limit | 0 | Sets the maximum allowed result for exact search by GIN. ignore_system_indexes | off | Disables reading from system indexes. integer_datetimes | on | Datetimes are integer based. IntervalStyle | postgres | Sets the display format for interval values. join_collapse_limit | 8 | Sets the FROM-list size beyond which JOIN constructs are not flattened. krb_caseins_users | off | Sets whether Kerberos and GSSAPI user names should be treated as case-insensitive. krb_srvname | postgres | Sets the name of the Kerberos service. lc_collate | en_US.UTF-8 | Shows the collation order locale. lc_ctype | en_US.UTF-8 | Shows the character classification and case conversion locale. lc_messages | en_US.UTF-8 | Sets the language in which messages are displayed. lc_monetary | en_US.UTF-8 | Sets the locale for formatting monetary amounts. lc_numeric | en_US.UTF-8 | Sets the locale for formatting numbers. lc_time | en_US.UTF-8 | Sets the locale for formatting date and time values. listen_addresses | * | Sets the host name or IP address(es) to listen to. local_preload_libraries | | Lists shared libraries to preload into each backend. log_autovacuum_min_duration | -1 | Sets the minimum execution time above which autovacuum actions will be logged. log_checkpoints | off | Logs each checkpoint. log_connections | off | Logs each successful connection. log_destination | stderr | Sets the destination for server log output. log_disconnections | off | Logs end of a session, including duration. log_duration | off | Logs the duration of each completed SQL statement. log_error_verbosity | default | Sets the verbosity of logged messages. log_executor_stats | off | Writes executor performance statistics to the server log. log_hostname | off | Logs the host name in the connection logs. log_line_prefix | | Controls information prefixed to each log line. log_lock_waits | off | Logs long lock waits. log_min_duration_statement | -1 | Sets the minimum execution time above which statements will be logged. log_min_error_statement | error | Causes all statements generating error at or above this level to be logged. log_min_messages | debug1 | Sets the message levels that are logged. log_parser_stats | off | Writes parser performance statistics to the server log. log_planner_stats | off | Writes planner performance statistics to the server log. log_rotation_age | 1d | Automatic log file rotation will occur after N minutes. log_rotation_size | 10MB | Automatic log file rotation will occur after N kilobytes. log_statement | none | Sets the type of statements logged. log_statement_stats | off | Writes cumulative performance statistics to the server log. log_temp_files | -1 | Log the use of temporary files larger than this number of kilobytes. log_timezone | GMT | Sets the time zone to use in log messages. log_truncate_on_rotation | on | Truncate existing log files of same name during log rotation. logging_collector | on | Start a subprocess to capture stderr output and/or csvlogs into log files. maintenance_work_mem | 400MB | Sets the maximum memory to be used for maintenance operations. max_connections | 1000 | Sets the maximum number of concurrent connections. max_files_per_process | 1000 | Sets the maximum number of simultaneously open files for each server process. max_function_args | 100 | Shows the maximum number of function arguments. max_identifier_length | 63 | Shows the maximum identifier length. max_index_keys | 32 | Shows the maximum number of index keys. max_locks_per_transaction | 64 | Sets the maximum number of locks per transaction. max_prepared_transactions | 0 | Sets the maximum number of simultaneously prepared transactions. max_stack_depth | 8MB | Sets the maximum stack depth, in kilobytes. password_encryption | on | Encrypt passwords. port | 5432 | Sets the TCP port the server listens on. post_auth_delay | 0 | Waits N seconds on connection startup after authentication. pre_auth_delay | 0 | Waits N seconds on connection startup before authentication. random_page_cost | 3 | Sets the planner's estimate of the cost of a nonsequentially fetched disk page. regex_flavor | advanced | Sets the regular expression "flavor". search_path | "$user",public | Sets the schema search order for names that are not schema-qualified. segment_size | 1GB | Shows the number of pages per disk file. seq_page_cost | 1 | Sets the planner's estimate of the cost of a sequentially fetched disk page. server_encoding | UTF8 | Sets the server (database) character set encoding. server_version | 8.4.0 | Shows the server version. server_version_num | 80400 | Shows the server version as an integer. session_replication_role | origin | Sets the session's behavior for triggers and rewrite rules. shared_buffers | 1600MB | Sets the number of shared memory buffers used by the server. silent_mode | off | Runs the server silently. sql_inheritance | on | Causes subtables to be included by default in various commands. ssl | off | Enables SSL connections. standard_conforming_strings | off | Causes '...' strings to treat backslashes literally. statement_timeout | 0 | Sets the maximum allowed duration of any statement. superuser_reserved_connections | 3 | Sets the number of connection slots reserved for superusers. synchronize_seqscans | on | Enable synchronized sequential scans. synchronous_commit | on | Sets immediate fsync at commit. syslog_facility | local0 | Sets the syslog "facility" to be used when syslog enabled. syslog_ident | postgres | Sets the program name used to identify PostgreSQL messages in syslog. tcp_keepalives_count | 0 | Maximum number of TCP keepalive retransmits. tcp_keepalives_idle | 0 | Time between issuing TCP keepalives. tcp_keepalives_interval | 0 | Time between TCP keepalive retransmits. temp_buffers | 51200 | Sets the maximum number of temporary buffers used by each session. temp_tablespaces | | Sets the tablespace(s) to use for temporary tables and sort files. TimeZone | GMT | Sets the time zone for displaying and interpreting time stamps. timezone_abbreviations | Default | Selects a file of time zone abbreviations. trace_notify | off | Generates debugging output for LISTEN and NOTIFY. trace_sort | off | Emit information about resource usage in sorting. track_activities | on | Collects information about executing commands. track_activity_query_size | 1024 | Sets the size reserved for pg_stat_activity.current_query, in bytes. track_counts | on | Collects statistics on database activity. track_functions | none | Collects function-level statistics on database activity. transaction_isolation | read committed | Sets the current transaction's isolation level. transaction_read_only | off | Sets the current transaction's read-only status. transform_null_equals | off | Treats "expr=NULL" as "expr IS NULL". unix_socket_group | | Sets the owning group of the Unix-domain socket. unix_socket_permissions | 511 | Sets the access permissions of the Unix-domain socket. update_process_title | on | Updates the process title to show the active SQL command. vacuum_cost_delay | 0 | Vacuum cost delay in milliseconds. vacuum_cost_limit | 200 | Vacuum cost amount available before napping. vacuum_cost_page_dirty | 20 | Vacuum cost for a page dirtied by vacuum. vacuum_cost_page_hit | 1 | Vacuum cost for a page found in the buffer cache. vacuum_cost_page_miss | 10 | Vacuum cost for a page not found in the buffer cache. vacuum_freeze_min_age | 50000000 | Minimum age at which VACUUM should freeze a table row. vacuum_freeze_table_age | 150000000 | Age at which VACUUM should scan whole table to freeze tuples. wal_block_size | 8192 | Shows the block size in the write ahead log. wal_buffers | 64kB | Sets the number of disk-page buffers in shared memory for WAL. wal_segment_size | 16MB | Shows the number of pages per write ahead log segment. wal_sync_method | fdatasync | Selects the method used for forcing WAL updates to disk. wal_writer_delay | 200ms | WAL writer sleep time between WAL flushes. work_mem | 600MB | Sets the maximum memory to be used for query workspaces. xmlbinary | base64 | Sets how binary values are to be encoded in XML. xmloption | content | Sets whether XML data in implicit parsing and serialization operations is to be considered as documents or content fragments. zero_damaged_pages | off | Continues processing past damaged page headers.
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