# This is only relevant when logging to eventlog (win32): #event_source = 'PostgreSQL' # 当启用了向事件日志记录时,这个参数决定用来标识日志中PostgreSQL消息的程序名。默认值是PostgreSQL。 # - When to Log - # #client_min_messages = notice # 控制被发送给客户端的消息级别。 # 有效值是DEBUG5...
Planning times become longer and memory consumption becomes higher when more partitions remain after the planner performs partition pruning. Another reason to be concerned about having a large number of partitions is that the server’s memory consumption may grow significantly over time, especially if ...
#syslog_split_messages = on # 当启用把日志记录到syslog时,这个参数决定消息如何送达 syslog。 # This is only relevant when logging to eventlog (win32): #event_source = 'PostgreSQL' # 当启用了向事件日志记录时,这个参数决定用来标识日志中PostgreSQL消息的程序名。默认值是PostgreSQL。 # - When to L...
Provide an integer number of kilobytes to thegin_pending_list_limitparameter to tune the maximum size of the GIN pending list which is used whenfastupdateis enabled. GistIndex¶ classGistIndex(*expressions,buffering=None,fillfactor=None,**options)¶ ...
}reln->smgr_targblock=InvalidBlockNumber;}/** smgrreleaserellocator() -- Release resources for given RelFileLocator, if* it's open.** This has the same effects as smgrrelease(smgropen(rlocator)), but avoids* uselessly creating a hashtable entry only to drop it again when no* such ...
aof-use-rdb-preamble yes lua-time-limit 5000 slowlog-log-slower-than 10000 slowlog-max-len 128 latency-monitor-threshold 0 notify-keyspace-events""hash-max-ziplist-entries 512 hash-max-ziplist-value 64 list-max-ziplist-size-2 list-compress-depth0set-max-intset-entries 512 ...
aligputf8-#WHENpp.parkind ='h'::"char"THEN'hash'::text aligputf8-#WHENpp.parkind ='r'::"char"THEN'range'::text aligputf8-#WHENpp.parkind ='l'::"char"THEN'list'::text aligputf8-#ELSENULL::text aligputf8-#ENDASpartitiontype, ...
# relation_regex is a regex rule, only takes effect when relation_name is not set. # schemas used for filtering, ignore this field when it is empty # relkind can be a list of the following options: # r(ordinary table), i(index), S(sequence), t(TOAST table), p(partitioned table...
Although indexes are intended to enhance a database's performance, there are times when they should be avoided. The following guidelines indicate when the use of an index should be reconsidered −Indexes should not be used on small tables. Tables that have frequent, large batch update or ...
use tempdb#切换到tempdb表 top n#查询前n条记录 limit 2,3#查询第2条开始的3条数据,也就是2,3,4 selectsubstring('string',2,1) #截取给定字符串的索引为2的1个字符 selectascii('a') #查询给定字符串的ascii值 selectlen('string') #查询给定字符串的长度 ...