walreceiver启动后通过recovery.conf文件中的primary_conninfo参数信息连向主库,主库通过连接参数replication=true启动walsender进程。 walreceiver执行identify_system命令,获取主库systemid/timeline/xlogpos等信息,执行TIMELINE_HISTORY命令拉取history文件。 执行wal_startstreaming开始启动流复制,通过walrcv_receive获取WAL日志...
walreceiver启动后通过recovery.conf文件中的primary_conninfo参数信息连向主库,主库通过连接参数replication=true启动walsender进程; walreceiver执行identify_system命令,获取主库systemid/timeline/xlogpos等信息,执行TIMELINE_HISTORY命令拉取history文件; 执行wal_startstreaming开始启动流复制,通过walrcv_receive获取WAL日志,...
同一个系统表的元组可能同时被多个进程的Cache所缓存,当其中某个Cache中的一个元组被删除或更新时 ,需要通知其他进程对其Cache进行同步。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...
pg_ident.conf: new ways to identify users in PostgreSQL Query jumbling for DDL and utility statements New function: bt_multi_page_stats New function: pg_split_walfile_name pg_walinspect, pg_waldump: collecting page images from WALDecember 31, 2022 • PostgreSQL PostgreSQL 16: part 3 or...
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There are a number of ways to identify the database servicecredentials. For example thecredentialsobject is available inVCAP_SERVICESof an application. The following steps provide another way of inspecting the credentials. Find an existing service key. ...
The pgpro_pwr module, designed to identify the most resource-intensive operations in the database, has been updated to version 4.7 and received additional features - a mechanism of intermediate samples for collecting relatively rapidly changing data, new report tables, in particular related to sessio...
To understand the nature of the deadlock we needed to identify the two competing processes. The first step was to pull out our Runbook for debugging lock timeouts in Postgres. 📖Read more about Runbooks in Incident Management To diagnose the issue we needed two key pieces of information: ...
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