article/postgresql_and_edb/edb表空间查询.md

SELECT nspname || '.' || relname AS "relation",
               pg_size_pretty(pg_total_relation_size(C.oid)) AS "total_size"
        FROM pg_class C
        LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
        WHERE nspname NOT IN ('pg_catalog', 'information_schema')
        AND C.relkind = 'r'
        ORDER BY pg_total_relation_size(C.oid) DESC;

 SELECT schemaname || '.' || relname AS "relation",
               pg_size_pretty(pg_total_relation_size(relid)) AS "total_size",
               pg_size_pretty(pg_table_size(relid) - pg_indexes_size(relid)) AS "table_size",
               pg_size_pretty(pg_indexes_size(relid)) AS "index_size",
               n_dead_tup
        FROM pg_stat_user_tables
        WHERE n_dead_tup > 0
        ORDER BY n_dead_tup DESC;
        

SELECT
  table_schema || '.' || table_name AS 完整表名,
  table_type AS 表类型,
  table_catalog AS 数据库名,
  -- 使用 format() 函数正确引用表名
  pg_size_pretty(pg_relation_size(format('%I.%I', table_schema, table_name))) AS 数据大小,
  pg_size_pretty(pg_indexes_size(format('%I.%I', table_schema, table_name))) AS 索引大小,
  pg_size_pretty(pg_total_relation_size(format('%I.%I', table_schema, table_name))) AS 总大小,
  pg_total_relation_size(format('%I.%I', table_schema, table_name)) AS 总字节数
FROM
  information_schema.tables
WHERE
  table_type IN ('BASE TABLE', 'PARTITIONED TABLE')
  AND table_schema NOT IN ('pg_catalog', 'information_schema', 'edb_sys')
ORDER BY
  总字节数 DESC;

SELECT
  pid,
  relid::regclass AS table_name,
  phase,
  heap_blks_total,
  heap_blks_scanned,
  heap_blks_scanned/heap_blks_total rate,
  heap_blks_vacuumed,
  index_vacuum_count,
  max_dead_tuples,
  num_dead_tuples
FROM
  pg_stat_progress_vacuum;

SELECT
  pid,
  usename,
  datname,
  query,
  state,
  query_start,
  now() - query_start AS running_time
FROM
  pg_stat_activity
WHERE
  query ILIKE '%VACUUM%'
ORDER BY
  query_start;


SELECT
  schemaname,
  relname,
  n_live_tup AS 活元组数量,
  n_dead_tup AS 死元组数量,
  round(100 * n_dead_tup / (n_live_tup + 1), 2) AS 死元组占比
FROM pg_stat_user_tables
WHERE n_live_tup > 0
  AND round(100 * n_dead_tup / (n_live_tup + 1), 2) > 20  -- 死元组占比超20%
ORDER BY 死元组占比 DESC;



SELECT
  schemaname,
  relname AS 索引名,
  pg_size_pretty(pg_relation_size(relid)) AS 索引大小,
  idx_scan AS 扫描次数,  -- EDB 中直接通过 pg_stat_user_indexes 的 idx_scan 字段获取扫描次数
  -- 索引膨胀率（索引实际大小 / 有效数据大小，>1.5 表示碎片严重）
  round(
    pg_relation_size(relid)::numeric /
    pg_indexes_size(relid::regclass)::numeric,  -- 修正类型转换，去掉多余的 text 转换
    2
  ) AS 膨胀率
FROM pg_stat_user_indexes
WHERE
  pg_indexes_size(relid::regclass) > 0  -- 排除无效索引
  AND round(
    pg_relation_size(relid)::numeric /
    pg_indexes_size(relid::regclass)::numeric,
    2
  ) > 1.5  -- 筛选膨胀率 >1.5 的索引
ORDER BY 膨胀率 DESC;