Naveen Gangam created HIVE-21336:
------------------------------------
Summary: HMS Index PCS_STATS_IDX too long for Oracle when
NLS_LENGTH_SEMANTICS=char
Key: HIVE-21336
URL: https://issues.apache.org/jira/browse/HIVE-21336
Project: Hive
Issue Type: Improvement
Components: Metastore
Affects Versions: 3.0.0
Reporter: Naveen Gangam
Assignee: Naveen Gangam
CREATE INDEX PCS_STATS_IDX ON PAR T_COL_STATS
(DB_NAME,TABLE_NAME,COLUMN_NAME,PARTITION_NAME)
Error: ORA-01450: maximum key length (6398) exceeded (state=72000,code=1450)
Customer tried the same DDL in SQLDevloper, and got the same error. This could
be a result of combination of DB level settings like the db_block_size,
limiting the maximum key length, as per below doc:
http://www.dba-oracle.com/t_ora_01450_maximum_key_length_exceeded.htm
Also {{NLS_LENGTH_SEMANTICS}} is by default BYTE, but users can set this at the
session level to CHAR, thus reducing the max size of the index length. We have
increased the size of the COLUMN_NAME from 128 to 767 (used to be at 1000) and
TABLE_NAME from 128 to 256. This by setting
{code}
CREATE TABLE PART_COL_STATS (
CS_ID NUMBER NOT NULL,
DB_NAME VARCHAR2(128) NOT NULL,
TABLE_NAME VARCHAR2(256) NOT NULL,
PARTITION_NAME VARCHAR2(767) NOT NULL,
COLUMN_NAME VARCHAR2(767) NOT NULL, ....
CREATE INDEX PCS_STATS_IDX ON PART_COL_STATS
(DB_NAME,TABLE_NAME,COLUMN_NAME,PARTITION_NAME);
{code}
Reproducer:
{code}
SQL*Plus: Release 11.2.0.2.0 Production on Wed Feb 27 11:02:16 2019 Copyright
(c) 1982, 2011, Oracle. All rights reserved.
Connected to: Oracle Database 11g Express Edition Release 11.2.0.2.0 - 64bit
Production
SQL> select * from v$nls_parameters where parameter = 'NLS_LENGTH_SEMANTICS';
PARAMETER
----------------------------------------------------------------
VALUE
----------------------------------------------------------------
NLS_LENGTH_SEMANTICS
BYTE
SQL> alter session set NLS_LENGTH_SEMANTICS=CHAR; Session altered.
SQL> commit; Commit complete.
SQL> select * from v$nls_parameters where parameter = 'NLS_LENGTH_SEMANTICS';
PARAMETER
----------------------------------------------------------------
VALUE
----------------------------------------------------------------
NLS_LENGTH_SEMANTICS
CHAR
SQL> CREATE TABLE PART_COL_STATS (CS_ID NUMBER NOT NULL, DB_NAME VARCHAR2(128)
NOT NULL, TABLE_NAME VARCHAR2(256) NOT NULL, PARTITION_NAME VARCHAR2(767) NOT
NULL, COLUMN_NAME VARCHAR2(767) NOT NULL);
Table created.
SQL> CREATE INDEX PCS_STATS_IDX ON PART_COL_STATS
(DB_NAME,TABLE_NAME,COLUMN_NAME,PARTITION_NAME);
CREATE INDEX PCS_STATS_IDX ON PART_COL_STATS
(DB_NAME,TABLE_NAME,COLUMN_NAME,PARTITION_NAME)
* ERROR at line 1: ORA-01450: maximum key length (6398) exceeded
SQL> alter session set NLS_LENGTH_SEMANTICS=BYTE;
Session altered.
SQL> commit;
Commit complete.
SQL> drop table PART_COL_STATS;
Table dropped.
SQL> commit;
Commit complete.
SQL> CREATE TABLE PART_COL_STATS (CS_ID NUMBER NOT NULL, DB_NAME VARCHAR2(128)
NOT NULL, TABLE_NAME VARCHAR2(256) NOT NULL, PARTITION_NAME VARCHAR2(767) NOT
NULL, COLUMN_NAME VARCHAR2(767) NOT NULL);
Table created.
SQL> CREATE INDEX PCS_STATS_IDX ON PART_COL_STATS
(DB_NAME,TABLE_NAME,COLUMN_NAME,PARTITION_NAME);
Index created.
SQL> commit;
Commit complete.
SQL>
{code}
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
