PostgreSQL DBA之数据库指标监控
-- 创建一个视图,提供有关PostgreSQL数据库大小的信息
CREATE OR REPLACE VIEW view_database_size AS
SELECT pg_database.datname as "Database",
pg_size_pretty(pg_database_size(pg_database.datname)) as "Size"
FROM pg_database;
-- 创建一个视图,提供有关数据库中每个表的大小信息
CREATE OR REPLACE VIEW view_table_size AS
SELECT
table_schema || '.' || table_name as "Table",
pg_size_pretty(pg_total_relation_size(table_schema || '.' || table_name)) as "Size"
FROM
information_schema.tables
ORDER BY
pg_total_relation_size(table_schema || '.' || table_name) DESC;
-- 创建一个函数,返回数据库的Bloat Factor
CREATE OR REPLACE FUNCTION get_bloat_factor(database_name text) RETURNS numeric AS $$
DECLARE
bloat_ratio numeric;
BEGIN
EXECUTE 'SELECT n_dead_tup / n_live_tup INTO ' || bloat_ratio || ' FROM pg_stat_user_tables WHERE n_live_tup + n_dead_tup <> 0';
RETURN bloat_ratio;
END;
$$ LANGUAGE plpgsql;
这个代码实例提供了创建视图和函数的基本模板,用于监控PostgreSQL数据库的大小和表的碎片程度。在实际使用时,需要根据具体的监控需求进行调整和扩展。
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