创建informix数据库表索引的时候报——'The total size of the index is too large or too many parts in index'
语句如下

CREATE INDEX index_alt ON yzym_e_alt(etpsid,uniscid,ALTDATE,ALTAF,ALTBE,ALTITEM,REGNO,s_ext_timestamp)

etpsid,uniscid,ALTDATE,ALTAF,ALTBE,ALTITEM,REGNO,s_ext_timestamp 是表yzym_e_alt中字段，其中ALTAF，和ALTBE字段是lvarchar(3000)

请问如何解决，创建索引？