dbms_space.unused_space 过程与DBA_TABLES显示信息不一样？
我有一个表xs1，我用以下命令分析它：
analyze table tsjb.xs1 compute statistics for all columns for table;
然后显示它的资料：
[php]
SELECT num_rows, blocks, empty_blocks as empty,
avg_space, chain_cnt, avg_row_len
FROM dba_tables WHERE owner = 'TSJB' AND table_name ='XS1';
NUM_ROWS BLOCKS EMPTY AVG_SPACE CHAIN_CNT AVG_ROW_LEN
---------- ---------- ---------- ---------- ---------- -----------
22 5 3 7932 0 30
[/php]
然后，又用 dbms_space.unused_space 显示：
[php]
Total blocks allocated to table =8
Total bytes allocated to table = 65536
Unused blocks(above HWM) = 0
Unused bytes(above HWM) = 0
Last extent used file id = 5
Last extent used begining block id = 8
Last used block in last extent = 8
[/php]
两次结果为什么不一样啊，dba_tables 中显示已使用块：5，高水标记以上块（BLOCKS列）为：3。
但dbms_space.unused_space 显示 总块为：8。高水标记以上块：0
我该谁的？
相关文章