9 CLIENT CONNECTION DEFAULTS

9.1 Statement Behavior

9.1.1 search_path

字元型
預設：search_path = '"$user", public'
當以使用者登入資料庫時,預設先查詢哪些資料庫。
"$user"表示同用戶名

9.1.2 default_tablespace

字元型
預設：default_tablespace = ''
預設tablespace, ''使用系統預設值

9.1.3 temp_tablespaces

字元型
預設：temp_tablespaces = ''
臨時tablespaces列表，''表示使用系統預設值
a list of tablespace names, '' uses only default tablespace
 

9.1.4 defaulttransactionisolation

字元型
預設：default_transaction_isolation = 'read committed'
資料庫的隔離級別有四種，分別是 Read uncommitte、Read committed、Repeatable read、Serializable。

9.1.5 其他

check_function_bodies = on
default_transaction_read_only = off
default_transaction_deferrable = off
session_replication_role = 'origin'
statement_timeout = 0                  # in milliseconds, 0 is disabled
lock_timeout = 0                       # in milliseconds, 0 is disabled
idle_in_transaction_session_timeout = 0        # in milliseconds, 0 is disabled
vacuum_freeze_min_age = 50000000
vacuum_freeze_table_age = 150000000
vacuum_multixact_freeze_min_age = 5000000
vacuum_multixact_freeze_table_age = 150000000
bytea_output = 'hex'                   # hex, escape
xmlbinary = 'base64'
xmloption = 'content'
gin_fuzzy_search_limit = 0
gin_pending_list_limit = 4MB
 

9.2 Locale and Formatting

datestyle = 'iso, mdy'
intervalstyle = 'postgres'
timezone = 'PRC'
timezone_abbreviations = 'Default'     # Select the set of available time zone abbreviations.  Currently, there are Default、Australia (historical usage)、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 = 'en_US.UTF-8'                     # locale for system error message strings
lc_monetary = 'en_US.UTF-8'                     # locale for monetary formatting
lc_numeric = 'en_US.UTF-8'                      # locale for number formatting
lc_time = 'en_US.UTF-8'                         # locale for time formatting

# default configuration for text search
default_text_search_config = 'pg_catalog.english'

3、Other Defaults
dynamic_library_path = '$libdir'
local_preload_libraries = ''
session_preload_libraries = ''
 

10 LOCK MANAGEMENT

10.1 deadlock_timeout

數字型
預設： deadlock_timeout = 1s
在檢查死鎖前，等待鎖的時間
deadlock檢查機制執行的代價比較高，因此在符合較重、locK動作較多的系統裡，可以適當地增大deadlock_timeout

10.2 其他

max_locks_per_transaction = 64         # min 10 (change requires restart)
max_pred_locks_per_transaction = 64    # min 10 (change requires restart)
max_pred_locks_per_relation = -2       # negative values mean (max_pred_locks_per_transaction  / -max_pred_locks_per_relation) - 1
max_pred_locks_per_page = 2            # min 0

11 版本/平臺相容性 VERSION/PLATFORM COMPATIBILITY

11.1 以前的PostgreSQL版本 Previous PostgreSQL Versions

array_nulls = on
backslash_quote = safe_encoding        # on, off, or safe_encoding
default_with_oids = off
escape_string_warning = on
lo_compat_privileges = off
operator_precedence_warning = off
quote_all_identifiers = off
standard_conforming_strings = on
synchronize_seqscans = on

11.2 Other Platforms and Clients

transform_null_equals = off

12 ERROR HANDLING

exit_on_error = off                    # terminate session on any error?
restart_after_crash = on               # reinitialize after backend crash?

13 CONFIG FILE INCLUDES

include_dir = 'conf.d'                 # include files ending in '.conf' from directory 'conf.d'
include_if_exists = 'exists.conf'      # include file only if it exists
include = 'special.conf'               # include file