ORA-01502: Index or Partition is in unusable status. while truncating table

Question

Hi All,
One of our Devlopers compalined that he is getting ORA-01502 : Index or partition is unusable status while truncating the a table in our Dataware house production database. He is using the following commands.
Alter index <index_name> unusable;
Truncate table <table_name> ;
He is running a scripts to truncate each table and ecah time he is passing the table name as an input parameter to script. He is using same method to truncate four tables each having a BITMAP and a REGULAR index. For two tables every thing is working fine, but for other two tables the he is getting ORA-01502 for BITMAP indexes. It a weekly process and every week he is getting the same issue. I checkd the Index status, they are in valid status only.
For a work around I have created a table with BITMAP and regular index in our dev database. made the indexes unusable, checked their status. I truncated the table. Importent thing here is the Indexes are becoming vaild when I truncate the table.
I suspect that my devloper's Indexes were already in unusable status (before he use the command ALTER INDEX), when he truncated the table, oracle trying to validate the index and throwing the error ORA-01502 because the Indexes are in unusabel statsu for a while.
I tried searching for the mechanism of truncate table command and its effect on Indexes. But I did not find any luck, no one is speaking about index when truncating the table. Can any one please help me????
Sorry for lengthy post. Any help is greatly appriciated and I thank every one in advance.

Answer 1

DDL for Indexes getting ORA-01502 error
CREATE BITMAP INDEX DWHMGR.ACT_TXN_LN_STG_01_XN3 ON DWHMGR.ACCT_TXN_LINE_TERM_BAL_STG_01 (TERM_BAL_CD ASC) TABLESPACE "BALFD_INX_04" NOLOGGING PCTFREE 1 INITRANS 2 MAXTRANS 255 STORAGE
( INITIAL 8M NEXT 8M MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 BUFFER_POOL DEFAULT );
CREATE BITMAP INDEX DWHMGR.ACCT_TERM_BAL_STG_01_XN3 ON DWHMGR.ACCT_TERM_BAL_STG_01 TERM_BAL_CD ASC) TABLESPACE "BALFD_INX_04" NOLOGGING PCTFREE 1 INITRANS 2 MAXTRANS 255 STORAGE
( INITIAL 8M NEXT 8M MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 BUFFER_POOL DEFAULT );
Indexes that have no issues.
CREATE INDEX DWHMGR.ACCT_TERM_BAL_STG_01_XN2 ON DWHMGR.ACCT_TERM_BAL_STG_01 (ACCT_REF_NB ASC) TABLESPACE "BALFD_INX_04" NOLOGGING PCTFREE 1 INITRANS 2 MAXTRANS 255 STORAGE (INITIAL 8M
NEXT 8M MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 BUFFER_POOL DEFAULT );
CREATE BITMAP INDEX DWHMGR.ACCT_PRC_STG_01_XN1 ON DWHMGR.ACCT_PRC_STG_01 (ACCT_ORG_CD ASC) TABLESPACE "BALFD_INX_04" NOLOGGING PCTFREE 1 INITRANS 2 MAXTRANS 255 STORAGE ( INITIAL 8M
NEXT 8M MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 BUFFER_POOL DEFAULT );
Please look at the DDL of the indexes and let me know if you need any other information.