直接创建一张带有LOB字段的表
SQL> create table TEST
(
   N_MESSAGE_ID         NUMBER(10,0)         not null,
   N_EVENT_ID           NUMBER(10,0)         not null,
   C_EVENT_VALUE        CLOB,
   C_EVENT_TYPE         VARCHAR2(50),
   N_RECIPIENT_ID       NUMBER(5,0)          not null,
   N_IS_RESENT          NUMBER(1)            default 0,
   D_PROCESSING_END_DATE TIMESTAMP,
   N_EJB_VERSION_ID     NUMBER(10),
   D_TIMESTAMP          TIMESTAMP(9) WITH TIME ZONE
);

Table created.

查询创建后的表的LOB字段名称和LOB索引名称，发现数据库分配了SYS开头的名称
SQL> select owner,table_name,column_name,segment_name,tablespace_name,index_name from dba_lobs where table_name = 'TEST' and owner = 'SCOTT';

OWNER         TABLE_NAME       COLUMN_NAME           SEGMENT_NAME       TABLESPACE_NAME      INDEX_NAME
------------ -------------------- -------------------- ------------------------- -------------------- ---------------------------
SCOTT         TEST          C_EVENT_VALUE        SYS_LOB0000016805C00003$$ USER_OTA4G          SYS_IL0000016805C00003$$

从数据库规范的角度出发，使用下面的语法进行表的创建
SQL> create table TEST
(
   N_MESSAGE_ID         NUMBER(10,0)         not null,
   N_EVENT_ID           NUMBER(10,0)         not null,
   C_EVENT_VALUE        CLOB,
   C_EVENT_TYPE         VARCHAR2(50),
   N_RECIPIENT_ID       NUMBER(5,0)          not null,
   N_IS_RESENT          NUMBER(1)            default 0,
   D_PROCESSING_END_DATE TIMESTAMP,
   N_EJB_VERSION_ID     NUMBER(10),
   D_TIMESTAMP          TIMESTAMP(9) WITH TIME ZONE
)
tablespace "USERS"
lob
(C_EVENT_VALUE)               --LOB字段名称
    store as
         LOB_SEGMENT_TEST        --LOB段(LOB Segment)的名称，如果不指定则使用数据库分配的SYS_开头的名称
(tablespace "USERS" INDEX INDX_LOB_TEST (tablespace "USERS" ));     --INDEX_LOB_TEST是LOB索引的名称，如果不指定则使用数据库分配的SYS_开头的名称，两个表空间分别是LOB段表空间和索引表空间的名称

Table created.

SQL> select owner,table_name,column_name,segment_name,tablespace_name,index_name from dba_lobs where table_name = 'TEST' and owner = 'SCOTT';

OWNER         TABLE_NAME       COLUMN_NAME           SEGMENT_NAME       TABLESPACE_NAME      INDEX_NAME
------------ -------------------- -------------------- ------------------------- -------------------- ---------------------------
SCOTT         TEST          C_EVENT_VALUE        LOB_SEGMENT_TEST    USERS              INDX_LOB_TEST

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Oracle 建表时LOB字段语法

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