Question

我必须对数据库进行分区以提高性能。但是插入速度减慢了2-3倍。

我们在一个查询中插入了大量数据，并且我读取了触发器的内容是为每一行运行的，但规则只在每个查询中运行。这是我怀疑的问题。

我甚至不确定这是否可以在规则中做到。所以我需要帮助优化此触发器或将其转换为规则。

CREATE OR REPLACE FUNCTION create_partition_and_insert() RETURNS trigger AS
    $BODY$
      DECLARE
        partition_date TEXT;
        partition TEXT;

      BEGIN
        partition_date := to_char((SELECT time from timestamps where ID=NEW.timestamp_id),'YYYY_MM_DD');
        partition := TG_RELNAME || '_' || partition_date;
        IF to_regclass(partition) IS NULL THEN
          RAISE NOTICE 'A partition has been created %',partition;
          EXECUTE 'CREATE TABLE ' || partition ||'(
            timestamp_id integer references timestamps(id),
            channel_id integer references channels(id)
          ) INHERITS (' || TG_RELNAME || ');';
          EXECUTE 'CREATE INDEX ' || partition ||'_timestamp_id_index ON ' || partition || ' (timestamp_id);';
          EXECUTE 'CREATE INDEX ' || partition ||'_channel_id_index ON ' || partition || ' (channel_id);';
        END IF;
        EXECUTE 'INSERT INTO ' || partition || ' SELECT ($1).*;' USING NEW;

        RETURN NULL;
      END;
    $BODY$
  LANGUAGE plpgsql VOLATILE
  COST 100;
  "

Postgres将触发器转换为规则/帮助优化触发器

0 个答案: