Oracle 索引的失效和重建

Posted 2020-06-10

查询指定表的索引

SELECT T1.TABLE_NAME,
T1.INDEX_NAME,
T1.INDEX_TYPE,
T1.UNIQUENESS,
T1.TABLE_OWNER,
T1.STATUS,
T1.FUNCIDX_STATUS
FROM ALL_INDEXES T1
WHERE T1.TABLE_OWNER = UPPER(‘&Owner‘)
AND T1.TABLE_NAME = UPPER(‘&Table_Name‘)
ORDER BY T1.STATUS DESC;

 

普通索引失效,主键和唯一性索引除外(为保障数据的规范性)

SELECT ‘ALTER INDEX ‘ || TABLE_OWNER || ‘.‘ || INDEX_NAME || ‘ UNUSABLE;‘ UNUSABLE_INDEX
FROM ALL_INDEXES
WHERE TABLE_OWNER = UPPER(‘&Owner‘)
AND TABLE_NAME = UPPER(‘&Table_Name‘)
AND INDEX_TYPE = ‘NORMAL‘
AND UNIQUENESS <> ‘UNIQUE‘;

 

并行(PARALLEL)重建索引，提升重建速度(在服务器空闲时执行)

SELECT ‘ALTER INDEX ‘ || TABLE_OWNER || ‘.‘ || INDEX_NAME ||
‘ REBUILD PARALLEL;‘
FROM ALL_INDEXES
WHERE TABLE_OWNER = UPPER(‘&Owner‘)
AND TABLE_NAME = UPPER(‘&Table_Name‘)
AND INDEX_TYPE = ‘NORMAL‘
AND UNIQUENESS <> ‘UNIQUE‘
AND STATUS = ‘UNUSABLE‘;

 

查询索引的状态和DEGREE并行度
注意：并行度默认设置为1，如果显示为default，表示数据库分配的cpu核心*2,重建完索引后并行度都改成1

SELECT ROWNUM,
S.INDEX_NAME,
S.INDEX_TYPE,
S.TABLE_OWNER,
S.TABLE_NAME,
S.UNIQUENESS,
S.STATUS,
S.DEGREE,
S.TABLESPACE_NAME
FROM ALL_INDEXES S
WHERE TABLE_OWNER = UPPER(‘&Owner‘)
AND TABLE_NAME = UPPER(‘&Table_Name‘);

 

将索引并行度不是1的还原回1

SELECT ‘ALTER INDEX ‘ || S.TABLE_OWNER || ‘.‘ || S.INDEX_NAME ||
‘ NOPARALLEL;‘
FROM ALL_INDEXES S
WHERE TABLE_OWNER = UPPER(‘&Owner‘)
AND TABLE_NAME = UPPER(‘&Table_Name‘)
AND S.DEGREE <> 1;