索引是一般索引还是分区索引，可以看dba_indexes的partitioned字段。
如果partitioned字段是YES，说明是分区索引，那么，这个索引是global还是local，可以看dba_part_indexes的LOCALITY字段。
另外，我们还可以看ALIGNMENT字段，看这个索引是基于前导列（prefixed）还是非前导列。(注：global肯定是基于前导列，因为不能建基于非前导列的global索引。而local索引可以基于前导列和非前导列)
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SQL> drop table invoices; Table dropped. --创建分区表，是range分区： SQL> CREATE TABLE invoices 2 (invoice_no NUMBER NOT NULL, 3 invoice_date DATE NOT NULL, 4 invoice_area varchar2(200), 5 invoice_serial number, 6 comments VARCHAR2(500), 7 invoice_name varchar2(20) 8 ) 9 PARTITION BY RANGE (invoice_date) 10 (PARTITION invoices_q1 VALUES LESS THAN (TO_DATE('01/04/2001', 'DD/MM/YYYY')) TABLESPACE users, 11 PARTITION invoices_q2 VALUES LESS THAN (TO_DATE('01/07/2001', 'DD/MM/YYYY')) TABLESPACE users, 12 PARTITION invoices_q3 VALUES LESS THAN (TO_DATE('01/09/2001', 'DD/MM/YYYY')) TABLESPACE users, 13 PARTITION invoices_q4 VALUES LESS THAN (TO_DATE('01/01/2002', 'DD/MM/YYYY')) TABLESPACE users); Table created. SQL> SQL> --创建global分区索引，分区类型可以和表一样，也可以不一样。这个索引是和表分区类型一样，但是value less值不一样。 SQL> CREATE INDEX idx_glob_inv_ser ON invoices (invoice_serial,comments) GLOBAL 2 PARTITION BY range (invoice_serial) 3 (PARTITION invoices_q1 VALUES LESS THAN (10) TABLESPACE users, 4 PARTITION invoices_q2 VALUES LESS THAN (20) TABLESPACE users, 5 PARTITION invoices_q3 VALUES LESS THAN (30) TABLESPACE users, 6 PARTITION invoices_q4 VALUES LESS THAN (40) TABLESPACE users, 7 PARTITION invoices_qmax VALUES LESS THAN (MAXVALUE) TABLESPACE users); Index created. SQL> SQL> --注意global分区索引，必须使用前导列，及如果索引列是 (comments,invoice_serial)， SQL> --但partition by xx(invoice_serial)用了非前导列，是会报错，不能创建成功的。 SQL> CREATE INDEX idx_glob_inv_date ON invoices (comments,invoice_serial) GLOBAL 2 PARTITION BY hash (invoice_serial) partitions 16; PARTITION BY hash (invoice_serial) partitions 16 * ERROR at line 2: ORA-14038: GLOBAL partitioned index must be prefixed SQL> SQL> SQL> --创建另一个global分区索引，这个索引的分区类型是和表分区类型不一样的。用了hash分区。但是prefix前导列的原理也是一样的，需要使用前导列。 SQL> CREATE INDEX idx_glob_inv_date ON invoices (comments,invoice_serial) GLOBAL 2 PARTITION BY hash (comments) partitions 16; Index created. SQL> SQL> SQL> --创建local索引，注意不能指定partition by的类型的，local索引的分区类型和分区数量必须和table一致，但是可以指定不同的表空间。这个local使用了前导列。 SQL> CREATE INDEX idx_glo_inv_dt ON invoices (invoice_date,invoice_serial) LOCAL 2 (PARTITION invoices_q1 TABLESPACE users, 3 PARTITION invoices_q2 TABLESPACE users, 4 PARTITION invoices_q3 TABLESPACE users, 5 PARTITION invoices_q4 TABLESPACE users); Index created. SQL> SQL> --如果分区数量必须和table不一致，会报错： SQL> CREATE INDEX idx_glo_inv_dt ON invoices (invoice_date,invoice_serial) LOCAL 2 (PARTITION invoices_q1 TABLESPACE users, 3 PARTITION invoices_q2 TABLESPACE users, 4 PARTITION invoices_q3 TABLESPACE users, 5 PARTITION invoices_q4 TABLESPACE users, 6 PARTITION invoices_q5 TABLESPACE users); CREATE INDEX idx_glo_inv_dt ON invoices (invoice_date,invoice_serial) LOCAL * ERROR at line 1: ORA-14024: number of partitions of LOCAL index must equal that of the underlying table SQL> --创建local索引，注，local索引可以使用非前导列。而global索引只能使用前导列，不能使用非前导列。 SQL> CREATE INDEX idx_glo_inv_serl ON invoices (invoice_serial,invoice_date) LOCAL 2 (PARTITION invoices_q1 TABLESPACE users, 3 PARTITION invoices_q2 TABLESPACE users, 4 PARTITION invoices_q3 TABLESPACE users, 5 PARTITION invoices_q4 TABLESPACE users); Index created. SQL> SQL> --如果分区数量必须和table不一致，会报错： SQL> CREATE INDEX idx_glo_inv_serl ON invoices (invoice_serial,invoice_date) LOCAL 2 (PARTITION invoices_q1 TABLESPACE users, 3 PARTITION invoices_q2 TABLESPACE users, 4 PARTITION invoices_q3 TABLESPACE users, 5 PARTITION invoices_q4 TABLESPACE users 6 PARTITION invoices_q5 TABLESPACE users, 7 PARTITION invoices_q6 TABLESPACE users); PARTITION invoices_q5 TABLESPACE users, * ERROR at line 6: ORA-14010: this physical attribute may not be specified for an index partition SQL> SQL> --创建一般索引（即非分区索引）： SQL> create index idx_glo_inv_comm on invoices (comments); Index created. SQL> SQL> SQL> SQL> SQL> select index_name,PARTITIONED from dba_indexes where table_name='INVOICES'; INDEX_NAME PARTIT -------------------- ------ IDX_GLOB_INV_SER YES IDX_GLOB_INV_DATE YES IDX_GLO_INV_DT YES IDX_GLO_INV_SERL YES IDX_GLO_INV_COMM NO SQL> SQL> select INDEX_NAME,PARTITIONING_TYPE,LOCALITY,ALIGNMENT from dba_part_indexes where table_name='INVOICES'; INDEX_NAME PARTITIONING_TYPE LOCALITY ALIGNMENT -------------------- ------------------ ------------ ------------------------ IDX_GLOB_INV_SER RANGE GLOBAL PREFIXED IDX_GLOB_INV_DATE HASH GLOBAL PREFIXED IDX_GLO_INV_DT RANGE LOCAL PREFIXED IDX_GLO_INV_SERL RANGE LOCAL NON_PREFIXED SQL> |