# query cache is possible. # If off, SQL comments effectively prevent the judgment # (pre 3.4 behavior). disable_load_balance_on_write = 'transaction' # Load balance behavior when write query is issued # in an explicit transaction. # # Valid values: # # 'transaction' (default): # if ...
relcache_query_target = primary memory_cache_enabled = off memqcache_method = 'shmem' memqcache_memcached_host = 'localhost' memqcache_memcached_port = 11211 memqcache_total_size = 64MB memqcache_max_num_cache = 1000000 memqcache_expire = 0 memqcache_auto_cache_invalidation = on memqcache_m...
在PostgreSQL的实现中,会记录下已被删除的无效元组,并通过SI Message方式(即共享消息队列方式)在进程之间传递这一消息。收到无效消息的进程将同步地把无效元组(或RelationData结构)从自己的Cache中删除。 为了实现SI Message这一功能,PostgreSQL在共享内存中开辟了shmInvalBuffer记录系统中所发出的所有无效消息以及所有进程...
Buffer cache hit ratio Easily get insights into your buffer cache hit ratio for each query, over time. Secure Postgres monitoring Learn more about secure database monitoring with pganalyze → Running on-premise pganalyze can be run on-premise inside a Docker container behind your firewall, on ...
This article explores PostgreSQL's buffer cache hit ratio (BCHR), a metric tracked by Redgate Monitor to help you assess the health and performance of your databases. By correctly interpreting this ratio and using it with other relevant memory and IO metrics, you can identify potential b...
它底层执行了一个rep; nop指令,其实也就是pause指令,这个指令核心目的在前面提到的官方文档中也有描述,因为我们实现的是忙等,在一个循环中,这个过程 lock变量的数据被放在了 cpu-cache 中, 访问较为高效。但是,其他cpu 释放锁并修改了这个 lock变量的值,由于cpu cache一致性,发现本地cpu这个变量的值和内存中的...
gitlab-postgresql-12.3 一、简介 1、gitlab 仅支持postgresql数据库管理系统,因此,数据库服务器有两个选项可用于linux软件包安装: 使用Linux软件包安装附带的打包PostgreSQL服务器(不需要配置,推荐) 使用外部postgresql服务器,(需要配
When set to "cache," an object's first access to its statistics is stored there until the transaction is complete, unless pg_stat_clear_snapshot() is performed. This is the default option. PostgreSQL会在事务开始时缓存统计信息,并在整个事务期间返回该缓存的数据。这可以确保在事务期间检索到的数据...
的全局执行计划缓存(Global Plan Cache)功能。 背景信息 在之前的PolarDB中,执行计划缓存(Plan Cache)是和Prepared Statement进行绑定的,这种做法存在以下两个问题: 每个连接的Plan Cache是独立的,无法共享。 每个连接都会缓存一份Plan Cache,导致内存占用较多。 PolarDB PostgreSQL版引入了全局执行计划缓存(简称GPC)功能...
connection_cache = on reset_query_list = 'ABORT; DISCARD ALL' replication_mode = off replicate_select = off insert_lock = on lobj_lock_table = '' replication_stop_on_mismatch = off failover_if_affected_tuples_mismatch = off load_balance_mode = on ...