问Postgres max_wal_size和wal_keep_size参数ENwal全称是write ahead log，是postgresql中的online redo ...
max_wal_size是PostgreSQL数据库中用于配置WAL(Write-Ahead Logging)的参数之一,用于控制WAL文件的最大大小。WAL是一种日志记录机制,用于持久化数据的变化操作,保证数据库的事务持久性和可恢复性。 该参数的单位是字节,表示WAL文件的最大大小。当WAL文件大小达到max_wal_size指定的值时,PostgreSQL会自动触发...
在编译安装的时候可以指定--with-wal-segsize=size修改默认的预写日志文件大小。 wal_level=replica fsync=on max_wal_size = 1GB min_wal_size = 80MB wal_level=replica 三个级别。 minimal 不能通过基础备份和预写日志恢复数据库。 replica 该级别支持预写日志的归档和复制。 logical 在replica级别的基础智...
logging_collector: "on" max_connections: 2000 max_replication_slots: 10 max_wal_senders: 10 max_wal_size: 5GB max_worker_processes: 40 min_wal_size: 1GB wal_level: "replica" password_encryption: scram-sha-256 superuser_reserved_connections: 200 create_replica_methods: - pgbackrest pgbackres...
其中的max_wal_size和min_wal_size官方含义如下所示。 max_wal_size (integer): Maximum size to let the WAL grow to between automatic WAL checkpoints. This is a soft limit; WAL size can exceed max_wal_size under special circumstances, like under heavy load, a failing archive_command, or a...
#wal_buffers = -1 # min 32kB, -1 sets based on shared_buffers # (change requires restart) #wal_writer_delay = 200ms # 1-10000 milliseconds #checkpoint_timeout = 5min # range 30s-1d max_wal_size = 1GB min_wal_size = 80MB ...
PostgreSQL依赖WAL日志进行崩溃恢复,手动删除可能导致数据丢失或恢复失败。 自动管理机制: PostgreSQL通过checkpoint机制自动维护WAL日志的数量。min_wal_size和max_wal_size参数软限制WAL日志在pg_wal目录的大小。 当WAL段文件被写满、调用pg_switch_wal()函数或超过archive_timeout配置的超时时间时,WAL段会进行切换。
checkpoint_timeout:两个自动WAL检查点之间的最长时间(默认为5分钟)。增加此参数可能会增加崩溃恢复所需的时间。2.max_wal_size: 两个自动WAL检查点之间的WAL日志的最大大小。默认值为1 GB。增大此参数可能会增加崩溃恢复所需的时间。如果我们同时设置了这两个参数,则检查点将以先到者为准。并不是说满max_wal...
max_wal_size=32GB min_wal_size=16GB archive_mode=on max_wal_senders=64 wal_keep_segments=15 wal_sender_timeout=60s max_replication_slots=64 hot_standby_feedback=off #log optimization log_destination='csvlog' logging_collector=on log_directory='/pg12.4/logs'# 日志存放路径,提前规划在系统上...
In today’s episode 10, we'll take a look at max_wal_size, full-page writes and why you might want to choose BIGINT instead of a UUID for your primary key column. Share this episode: Click here to post to twitter, or sign up for our newsletter and check out the newsletter archive...