oracle全文索引之datastore_3_FILE_DATASTORE

DATASTORE是FILE_DATASTORE的测试
[oracle@rhel140 ~]$ cat OUTPUT.TXT
ORACLE
oracle
[oracle@rhel140 LOG]$ cat EMPXT_000_2012_2680.LOG
SOURCE
ABC
SQL> conn myuser/myuser
Connected.
SQL> CREATE TABLE T (ID NUMBER, DOCS VARCHAR2(1000));
Table created.
SQL> INSERT INTO T VALUES (1, 'OUTPUT.TXT');
1 row created.
SQL> commit;
Commit complete.
SQL> BEGIN
2 CTX_DDL.CREATE_PREFERENCE('TEST_FILE', 'FILE_DATASTORE');
3 CTX_DDL.SET_ATTRIBUTE('TEST_FILE', 'PATH', '/home/oracle');
4 END;
5 /
PL/SQL procedure successfully completed.
SQL> CREATE INDEX IND_T_DOCS ON T (DOCS) INDEXTYPE IS CTXSYS.CONTEXT
PARAMETERS ('DATASTORE TEST_FILE'); 2
Index created.
SQL> SELECT * from T WHERE CONTAINS(DOCS, 'ORACLE') > 0;
ID DOCS
---- --------------------
1 OUTPUT.TXT
需要注意的是在建立PREFERENCE的PATH属性时不能用客户端的目录和文件，一定是服务器端的目录和文件，
我用WINDOWS的目录时，在dr$index_error中就会出现下面的错误
SQL> select * from ctxsys.dr$index_error;
ERR_IDX_ID ERR_TIMES ERR_TEXTKEY
---------- --------- ------------------
ERR_TEXT
--------------------------------------------------------------------------------
1181 13-MAY-09 AAAM52AAEAAAAGkAAA
DRG-11513: unable to open or write to file /home/oracle/OUTPUT.TXT
SQL> INSERT INTO T VALUES (2, 'LOG/EMPXT_000_2012_2680.LOG');
1 row created.
SQL> commit;
Commit complete.
SQL> exec CTX_DDL.SYNC_INDEX('IND_T_DOCS');
PL/SQL procedure successfully completed.
SQL> SELECT * from T WHERE CONTAINS(DOCS, 'SOURCE') > 0;
no rows selected
Oracle似乎只支持在FILE_DATASTORE中设置的路径中进行搜索，即使像上面这个例子中第2条记录，文档存储在
指定路径下的子目录中，这种情况也是没有办法进行索引的。
如果将文件位置从/home/oracle/LOG挪到/home/oracle目录下，则可以进行索引：
SQL> host mv /home/oracle/LOG/EMPXT_000_2012_2680.LOG /home/oracle
SQL> UPDATE T SET DOCS = 'EMPXT_000_2012_2680.LOG' WHERE ID = 2;
1 row updated.
SQL> COMMIT;
Commit complete.
SQL&g