此时我们可以发现freelists只是记录了这个segment中空闲块的第一个块地址和最后一个块地址,在第一个空闲块的块头处(block header)记录了它之后的下一个空闲块的地址,而下一个空闲块又记录了再下一个空闲块的地址,由此依次记录,一直到最后一个空闲块。Oracle通过这种链表的方式实现了freelists对于空闲块的管理。 注...
所以,在仍然存在有大量Oracle8i数据库和非自动段空间管理表空间的现在,对于freelists的研究仍然具有很实际的意义,而由于默认的freelists和freelist groups又都只有1,所以又恰恰是高负载的应用中最需要调整(Tuning)的部分之一。 三.freelists存储在哪儿 freelists存储在每个segment的header block中,我们可以通过dump来得到...
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freelists存储在每个segment的header block中,我们可以通过dump来得到更清楚的认识。dump在研究oracle的内部机制时通常都扮演着很重要的角色。 假设我们创建一个表空间TS_TEST,此表空间是非自动段空间管理的,然后在该表空间中创建T_MANUAL,T_MANUAL_FREE2,T_MANUAL_FREEGROUP2三张表。这三张表的freelists和freelist...
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SQL> create table t1(a char(1000)) storage( freelists 3); 表已建立。 SQL> set serveroutput on; SQL> exec show_space('T1'); Free Blocks...0 <==Number of blocks on freelist Total Blocks...5 <==Total data blocks in segment Total Bytes...20480 <==Total bytes in segment Unused ...
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《关于Freelists和Freelist Groups的研究(修订版) freelists存储在哪儿数据库教程》(https://www.unjs.com)。 SQL> alter system dump datafile 7 block 9; System altered 查看user_dump_dest目录中的相应trace文件,我们可以看到包含如下几行:frmt: 0x02 chkval: 0x0000 type: 0x10=DATA SEGMENT HEADER –...