r - 如何将 application_name 发送到 RPostgreSQL 连接

Question

我知道 PostgreSQL 数据库允许跟踪每个连接的应用程序名称，并且看起来 application_name 变量应该与 RPostgreSQL 一起使用，但我应该怎么做呢？将变量 application_name = "test" 添加到 dbConnect 不起作用。

Answer 1

I'm not sure you can pass application_name='test' as an argument to dbConnect in RPostgreSQL (there is an optional options argument, but I couldn't figure out what kind of data it expects).

An alternative would be to run the following SQL query immediately after opening the connection:

SET application_name='test'

and it should work until you close the connection.

Answer 2

它没有很好的记录，但类似这样的工作：

drv <- dbDriver("PostgreSQL")
con <- dbConnect(drv, 
           dbname  = "<my_db>",
           host = "<my_host>", 
           [...], 
           options = "-c application_name=my_app_name"
       )

它也适用于dbPool（包'pool'）：

pool <- dbPool(
            drv = dbDriver("PostgreSQL"),
            dbname = "<my_db>",
            host = "<my_host>",
            [...]
            minSize = 0,
            maxSize = 3,
            options = "-c application_name=my_app_name"
        )

检查与pg_stat_activity

mydb=> SELECT state, usename, application_name FROM pg_stat_activity WHERE datname = 'mydb';
 state  | usename  | application_name
--------+----------+------------------
 active | postgres | psql
 idle   | myuser    | my_app_name