ORACLE 日常查询

一. 查询索引相关

1. 查询索引所在的表空间，单个索引的大小

SELECT ui.table_name, us.segment_name AS index_name, us.tablespace_name,
       ROUND(SUM(us.bytes) / 1024 / 1024 / 1024, 2) AS total_size_GB
FROM dba_indexes ui
JOIN dba_segments us ON ui.index_name = us.segment_name
WHERE ui.owner = '用户'  -- 替换为实际使用用户（需大写）
GROUP BY ui.table_name, us.segment_name, us.tablespace_name
ORDER BY total_size_GB DESC;

2.查询索引所使用的表空间的大小

SELECT us.tablespace_name,
       ROUND(SUM(us.bytes) / 1024 / 1024 / 1024, 2) AS total_size_GB
FROM dba_indexes ui
JOIN dba_segments us ON ui.index_name = us.segment_name
WHERE ui.owner = '用户'  -- 替换为实际使用用户（需大写）
GROUP BY  us.tablespace_name
ORDER BY total_size_GB DESC;