plsql如何查看表空間使用情況

在PL/SQL中查看表空間使用情況，可以通過以下步驟進(jìn)行：

1. 使用以下查詢語句查看數(shù)據(jù)庫中所有表空間的使用情況：

SELECT tablespace_name, 
       SUM(bytes) / 1024 / 1024 AS total_size_mb, 
       SUM(bytes - NVL(free_bytes, 0)) / 1024 / 1024 AS used_size_mb, 
       NVL(free_bytes, 0) / 1024 / 1024 AS free_size_mb, 
       round((SUM(bytes - NVL(free_bytes, 0)) / SUM(bytes)) * 100, 2) AS used_pct
FROM (SELECT tablespace_name, sum(bytes) AS bytes
      FROM dba_data_files
      GROUP BY tablespace_name
      UNION ALL
      SELECT tablespace_name, sum(bytes) AS bytes
      FROM dba_temp_files
      GROUP BY tablespace_name
      UNION ALL
      SELECT tablespace_name, sum(bytes) AS free_bytes
      FROM dba_free_space
      GROUP BY tablespace_name)
GROUP BY tablespace_name, free_bytes
ORDER BY tablespace_name;

2. 運(yùn)行上述查詢語句，將輸出顯示數(shù)據(jù)庫中所有表空間的名稱、總大小、使用大小、剩余空間大小以及使用百分比。

通過以上查詢語句，您可以方便地查看數(shù)據(jù)庫中所有表空間的使用情況，幫助您管理和優(yōu)化表空間的存儲(chǔ)空間。