update

postgresql_and_edb/edb表空间查询.md

@@ -23,5 +23,98 @@ SELECT nspname || '.' || relname AS "relation",
         FROM pg_stat_user_tables
         WHERE n_dead_tup > 0
         ORDER BY n_dead_tup DESC;
+        
 ```
 
+
+
+```sql
+
+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;
+
+```
+
+
+
+```sql
+
+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;
+
+```