postgresql - pgloader - PostgreSQL 的快速数据加载

Question

我想加速将数据加载到 PostgreSQL。我开始使用 pgloader https://github.com/dimitri/pgloader并想利用并行加载。我正在修改不同的参数，但我无法在我的机器上激活两个以上的内核(其中有 32 个)。我找到了文档 https://github.com/dimitri/pgloader/blob/master/pgloader.1.md并尝试设置那里描述的批处理选项。目前，我有这些设置:

 LOAD CSV
      FROM '/home/data1_1.csv'
      --FROM 'data/data.csv'            
      INTO postgresql://:postgres@localhost:5432/test?test

      WITH truncate,  
           skip header = 0,  
           fields optionally enclosed by '"',  
           fields escaped by double-quote,  
           fields terminated by ',',
           batch rows = 100,
           batch size = 1MB,     
           batch concurrency = 64

       SET client_encoding to 'utf-8',  
           work_mem to '10000MB',  
           maintenance_work_mem to '20000 MB'

Answer 1

我也遇到了这个问题，pgloader 似乎还不支持使用您提到的 batch 选项进行并行加载。这有点令人困惑，但是official documentation解释这些设置是关于内存管理的，而不是并行性:

batch concurrency
Takes a numeric value as argument, defaults to 10. That's the number of batches that pgloader is allows to build in memory, even when only a single batch at a time might be sent to PostgreSQL.

Supporting more than a single batch being sent at a time is on the TODO list of pgloader, but is not implemented yet. This option is about controlling the memory needs of pgloader as a trade-off to the performances characteristics, and not about parallel activity of pgloader.