Which index can you rebuild?

I recently wrote on table reorg and rebuild index

Rule number one : you cannot rebuild a partitioned index in whole. You need to rebuild each individual (sub-)partition

Rule number two : to rebuild an iot, move the table instead of trying to rebuild the underlying index

Rule number three : a LOB index is not really an index. Do not rebuild this

Rule number four : a NOSEGMENT index is not a supported type of index, but it may appear in your user_objects list. It is used internally by OEM and other tuning tools to do a what-if calculation on the explain plan. It is not listed in USER_INDEXES. Do not rebuild this

Test case :


SQL> CREATE CLUSTER c(x NUMBER);

Cluster created.

SQL> CREATE INDEX a01
  2    ON CLUSTER c;

Index created.

SQL> CREATE TABLE t
  2  (
  3    p     NUMBER PRIMARY KEY,
  4    a01   NUMBER,
  5    a02   NUMBER,
  6    a03   NUMBER,
  7    a04   NUMBER,
  8    a05   NUMBER,
  9    a06   NUMBER,
 10    a07   VARCHAR2 (40),
 11    a08   CLOB
 12  );

Table created.

SQL> CREATE INDEX a02
  2    ON t (a01);

Index created.

SQL> CREATE INDEX a03
  2    ON t (a02)
  3    REVERSE;

Index created.

SQL> CREATE INDEX a04
  2    ON t (SQRT (a01));

Index created.

SQL> CREATE INDEX a05
  2    ON t (COS (a01))
  3    REVERSE;

Index created.

SQL> CREATE BITMAP INDEX a06
  2    ON t (a03);

Index created.

SQL> CREATE BITMAP INDEX a07
  2    ON t (SIGN (a04));

Index created.

SQL> CREATE INDEX a08
  2    ON t (a07)
  3    INDEXTYPE IS ctxsys.context;

Index created.

SQL> CREATE INDEX a09
  2    ON t (a05)
  3    GLOBAL PARTITION BY HASH (a05)
  4       (PARTITION p);

Index created.

SQL> CREATE TABLE i (x NUMBER CONSTRAINT A10 PRIMARY KEY)
  2  ORGANIZATION INDEX;

Table created.

SQL> CREATE INDEX A11 on T(A06) NOSEGMENT;

Index created.

SQL>   SELECT index_name,
  2          index_type,
  3          partitioned,
  4          generated
  5     FROM user_indexes
  6  ORDER BY 1;

INDEX_NAME                     INDEX_TYPE                  PAR G
------------------------------ --------------------------- --- -
A01                            CLUSTER                     NO  N
A02                            NORMAL                      NO  N
A03                            NORMAL/REV                  NO  N
A04                            FUNCTION-BASED NORMAL       NO  N
A05                            FUNCTION-BASED NORMAL/REV   NO  N
A06                            BITMAP                      NO  N
A07                            FUNCTION-BASED BITMAP       NO  N
A08                            DOMAIN                      NO  N
A09                            NORMAL                      YES N
A10                            IOT - TOP                   NO  N
DR$A08$X                       NORMAL                      NO  N
SYS_C009276                    NORMAL                      NO  Y
SYS_IL0000028076C00009$$       LOB                         NO  Y
SYS_IL0000028087C00006$$       LOB                         NO  Y
SYS_IL0000028092C00002$$       LOB                         NO  Y
SYS_IOT_TOP_28090              IOT - TOP                   NO  Y
SYS_IOT_TOP_28095              IOT - TOP                   NO  Y

SQL> ALTER INDEX a01 REBUILD;

Index altered.

SQL> ALTER INDEX a02 REBUILD;

Index altered.

SQL> ALTER INDEX a03 REBUILD;

Index altered.

SQL> ALTER INDEX a04 REBUILD;

Index altered.

SQL> ALTER INDEX a05 REBUILD;

Index altered.

SQL> ALTER INDEX a06 REBUILD;

Index altered.

SQL> ALTER INDEX a07 REBUILD;

Index altered.

SQL> ALTER INDEX a08 REBUILD;

Index altered.

SQL> ALTER INDEX a09 REBUILD;
ALTER INDEX a09 REBUILD
            *
ERROR at line 1:
ORA-14086: a partitioned index may not be rebuilt as a whole

SQL> ALTER INDEX a09 REBUILD PARTITION P;

Index altered.

SQL> ALTER INDEX a10 REBUILD;
ALTER INDEX a10 REBUILD
*
ERROR at line 1:
ORA-28650: Primary index on an IOT cannot be rebuilt

SQL> ALTER TABLE i MOVE;

Table altered.

SQL> ALTER INDEX A11 REBUILD;
ALTER INDEX A11 REBUILD
*
ERROR at line 1:
ORA-08114: can not alter a fake index

SQL> ALTER INDEX SYS_IL0000028076C00009$$ REBUILD;
ALTER INDEX SYS_IL0000028076C00009$$ REBUILD
*
ERROR at line 1:
ORA-02327: cannot create index on expression with datatype LOB

A function-based domain index should be rebuildable too, I have not tested this for you

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