120 lines
3.0 KiB
Markdown
120 lines
3.0 KiB
Markdown
```sql
|
|
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;
|
|
```
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
```sql
|
|
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;
|
|
|
|
```
|
|
|
|
|
|
|
|
```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;
|
|
|
|
``` |