The VACUUM command in PostgreSQL is used to reclaim storage occupied by dead tuples and update table statistics. Dead tuples are created due to updates and deletions but are not immediately removed to maintain
psql# 一个基于命令行的PostgreSQL交互式客户端程序createdb# 创建一个新的PostgreSQL的数据库(和SQL语句:CREATE DATABASE 相同)createuser# 创建一个新的PostgreSQL的用户(和SQL语句:CREATE USER 相同)dropdb# 删除数据库dropuser# 删除用户pg_dump# 将PostgreSQL数据库导出到一个脚本文件pg_dumpall# 将所有的PostgreS...
Three of these will be introduced in this article: VACUUM, ANALYZE, and REINDEX. To avoid conflicting database updates or corrupted data, it is recommended to run these commands during a maintenance window and with the application stopped. In the default PostgreSQL configuration, the ...
#vacuum_buffer_usage_limit = 256kB # 清理和分析缓冲区访问策略环的大小; # 0 表示禁用清理缓冲区访问策略; 磁盘 #temp_file_limit = -1 # 每个进程临时文件空间限制,单位为千字节,-1 表示无限制基于成本的清理延迟 #vacuum_cost_delay = 0 # 超过成本限制时进程将休眠的时间量,单位为毫秒(0 表示禁用...
Big Data Analytics && BI Windows Linux Contact Us About UsHome/PostgreSQL PostgreSQLPostgreSQL Vacuum Faruk Erdem March 31, 2025 PostgreSQL 0 In today’s article, we will provide important insights on dead rows, vacuum operations, FSM, and VM in PostgreSQL. When performing UPDATE or DELETE oper...
...尽管用户可以将这个值设置为从 0 到10 亿,VACUUM会悄悄地将有效值设置为autovacuum_multixact_freeze_max_age值的一半,这样在强制执行的自动清理之间不会有过短的时间间隔...只有特别为与PostgreSQL一起使用设计的共享库才能以这种方式载入。每一个PostgreSQL支持 的库都有一个“魔法块”,它会被检查以保证兼...
Thus, a single query could use multiple work_mem in total, for example, in a nested string of hash joins. maintenance_work_mem This determines the maximum amount of memory used for maintenance operations like VACUUM, CREATE INDEX, ALTER TABLE ADD FOREIGN KEY, and data-loading operations. ...
Example: -bash-4.1$ initdb -D ~/test -W The files belonging to this database system will be owned by user"postgres". This user must also own the server process. The database cluster will be initialized with locale en_US.UTF-8. ...
vacuum full形式：通过把dead tuple空间之外的内容写成一个完整的新版本表来主动紧缩表，这会最小化表的...
PostgreSQL Vacuum Faruk Erdem March 31, 2025 PostgreSQL 0 In today’s article, we will provide important insights on dead rows, vacuum operations, FSM, and VM in PostgreSQL. When performing UPDATE or DELETE operations on … Read More » How to List Open Files in Linux Onur ARDAHANLI March...