fix

Author: digoal

202406/20240621_01.md

@@ -207,6 +207,34 @@ lsof -p 7,$(pgrep -P 7 | tr '\n' ',')
 最后, D-Smart也提供了工具清理孤儿文件, 参考:    
 - https://www.modb.pro/db/1737302971619303424    
 
+以及pg_orphaned插件, 也支持清理孤儿文件:   
+- https://github.com/bdrouvot/pg_orphaned  
+  
+这个插件支持事务中的文件不会被查出来当成孤儿文件, 例如:
+```
+Session 1:
+
+postgres=# begin;
+BEGIN
+postgres=*# create table bdtinpgro (a int);
+CREATE TABLE
+
+Session 2 would report a false orphaned file if using a query like:
+
+postgres=# select * from pg_ls_dir ( '/home/postgres/pgorph/pg_installed/data/base/13580' ) as file where file ~ '^[0-9]*$' and file::text not in (select oid::text from pg_class );
+ file
+-------
+ 16408
+(1 row)
+
+while the extension would not report this false positive:
+
+postgres=# select * from pg_list_orphaned();
+ dbname | path | name | size | mod_time | relfilenode | reloid
+--------+------+------+------+----------+-------------+--------
+(0 rows)
+```
+    
 再次提醒: 删除数据文件一定要谨慎.     
 
 本文实验可以在我提供的两个docker image中完成: