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Oracle中如何從BasicFile遷移到SecureFile

編輯：Oracle數據庫基礎

我創建了一個新表TRBTKT.SECURE_TICKETS重新定義了原始表TRBTKT.TICKETS的結構，將原始的BasicFile LOB映射到對應的SecureFile LOB，然後執行了一條INSERT INTO … SELECT FROM DML語句將原始表中的內容傳輸到新表中。

在一個相對簡單的應用程序環境中，這種載入方式足以應付，但目前在數據倉庫和商業智能應用程序中廣泛地使用了LOB，特別是存儲那些包含了復雜商務交易的XML文檔和醫院信息系統捕獲到的醫療影像數據。

為了便於說明，我使用清單1中的代碼重新創建了這兩個表，我使用了列表分區對這兩個表進行了分區，在清單2中，我使用更大的數據重新載入TRBTKT.TICKETS表。

清單1 使用列表分區重新創建這兩個表以模擬數據倉庫環境

-- 重新創建表TRBTKT.TICKETS，這次包括了一個STATUS列

CREATE TABLE trbtkt.tickets (
tkt_idNUMBER
,description    VARCHAR2(30)
,submit_dtm     TIMESTAMP
,statusVARCHAR2(8)
,document       BLOB
,scrnimg        BLOB
)
LOB(document)   
STORE AS BASICFILE (TABLESPACE basicfiles)
,LOB(scrnimg)    
STORE AS BASICFILE (TABLESPACE basicfiles)
PARTITION BY LIST (status) (
PARTITION sts_open 
VALUES ('OPEN')
,PARTITION sts_pending
VALUES ('PENDING')
,PARTITION sts_closed
VALUES ('CLOSED')
,PARTITION sts_other
VALUES (DEFAULT)
)
;
--注釋
COMMENT ON TABLE trbtkt.tickets
IS 'Contains Trouble Ticket transaction data';
COMMENT ON COLUMN trbtkt.tickets.tkt_id
IS 'Unique identifIEr for a Trouble Ticket';
COMMENT ON COLUMN trbtkt.tickets.description
IS 'Trouble Ticket Description';
COMMENT ON COLUMN trbtkt.tickets.submit_dtm
IS 'Trouble Ticket Submission Time Stamp';
COMMENT ON COLUMN trbtkt.tickets.status
IS 'Trouble Ticket Status';
COMMENT ON COLUMN trbtkt.tickets.document
IS 'Large Object (LOB) that contains a Microsoft Word document that provides detailed information about a Trouble Ticket';
COMMENT ON COLUMN trbtkt.tickets.scrnimg
IS 'Large Object (LOB) that contains a screen print or other image that helps a problem solver identify how to act on a Trouble Ticket';
-- 創建索引和約束
CREATE UNIQUE INDEX trbtkt.tickets_pk_idx
ON trbtkt.tickets(tkt_id)
TABLESPACE users;
ALTER TABLE trbtkt.tickets
ADD CONSTRAINT tickets_pk
PRIMARY KEY (tkt_id);

--- 創建表TRBTKT.SECURE_TICKETS的一個改良版本，使用分區劃分SecureFile LOB的存儲，基於STATUS 的值設置合適的保留周期

DROP TABLE trbtkt.secure_tickets PURGE;
CREATE TABLE trbtkt.secure_tickets (
tkt_idNUMBER
,description    VARCHAR2(30)
,submit_dtm     TIMESTAMP
,statusVARCHAR2(8)
,document       BLOB
,scrnimg        BLOB
)
LOB(document)   
STORE AS SECUREFILE (
TABLESPACE securefiles
DISABLE STORAGE IN ROW
CACHE
)
,LOB(scrnimg)    
STORE AS SECUREFILE (
TABLESPACE securefiles
DISABLE STORAGE IN ROW
CACHE READS
)
PARTITION BY LIST (status) (
PARTITION sts_open 
VALUES ('OPEN')
LOB (document) STORE AS SECUREFILE (KEEP_DUPLICATES NOCOMPRESS)
,LOB (scrnimg)  STORE AS SECUREFILE (KEEP_DUPLICATES COMPRESS)
,PARTITION sts_pending
VALUES ('PENDING')
LOB (document) STORE AS SECUREFILE (KEEP_DUPLICATES NOCOMPRESS)
,LOB (scrnimg)  STORE AS SECUREFILE (DEDUPLICATE COMPRESS)
,PARTITION sts_closed
VALUES ('CLOSED')
LOB (document) STORE AS SECUREFILE (DEDUPLICATE COMPRESS)
,LOB (scrnimg)  STORE AS SECUREFILE (DEDUPLICATE COMPRESS HIGH)
,PARTITION sts_other
VALUES (DEFAULT)
LOB (document) STORE AS SECUREFILE (DEDUPLICATE COMPRESS HIGH)
,LOB (scrnimg)  STORE AS SECUREFILE (DEDUPLICATE COMPRESS HIGH)
)
;
--注釋
COMMENT ON TABLE trbtkt.secure_tickets
IS 'Contains Trouble Ticket transaction data';
COMMENT ON COLUMN trbtkt.secure_tickets.tkt_id
IS 'Unique identifIEr for a Trouble Ticket';
COMMENT ON COLUMN trbtkt.secure_tickets.description
IS 'Trouble Ticket Description';
COMMENT ON COLUMN trbtkt.secure_tickets.submit_dtm
IS 'Trouble Ticket Submission Time Stamp';
COMMENT ON COLUMN trbtkt.secure_tickets.status
IS 'Trouble Ticket Status';
COMMENT ON COLUMN trbtkt.secure_tickets.document
IS 'Large Object (LOB) that contains a Microsoft Word document that provides detailed information about a Trouble Ticket';
COMMENT ON COLUMN trbtkt.secure_tickets.scrnimg
IS 'Large Object (LOB) that contains a screen print or other image that helps a problem solver identify how to act on a Trouble Ticket';

清單2 使用附加數據重新載入表TRBTKT.TICKETS

SET SERVEROUTPUT ON
TRUNCATE TABLE trbtkt.tickets;
BEGIN
trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 101
,description => 'Trouble Ticket 101'
,submit_dts => '2008-12-31 23:45:00'
,status => 'OPEN'
,docFileName => 'New_101.doc'
,imgFileName => 'DBRIssues.jpg'
);
trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 102
,description => 'Trouble Ticket 102'
,submit_dts => '2009-01-04 00:00:00'
,status => 'OPEN'
,docFileName => 'New_102.doc'
,imgFileName => 'Unresolved.jpg'
);
trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 103
,description => 'Trouble Ticket 103'
,submit_dts => '2009-01-02 00:00:00'
,status => 'OPEN'
,docFileName => 'New_103.doc'
,imgFileName => 'Unresolved.jpg'
);
trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 104
,description => 'Trouble Ticket 104'
,submit_dts => '2009-01-14 12:30:00'
,status => 'OPEN'
,docFileName => 'New_104.doc'
,imgFileName => 'DBRIssues.jpg'
);
trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 105
,description => 'Trouble Ticket 105'
,submit_dts => '2009-01-09 00:00:00'
,status => 'OPEN'
,docFileName => 'New_105.doc'
,imgFileName => 'Unresolved.jpg'
);
trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 106
,description => 'Trouble Ticket 106'
,submit_dts => '2009-01-11 00:00:00'
,status => 'OPEN'
,docFileName => 'New_106.doc'
,imgFileName => 'Unresolved.jpg'
);
trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 107
,description => 'Trouble Ticket 107'
,submit_dts => '2009-01-16 00:00:00'
,status => 'OPEN'
,docFileName => 'New_107.doc'
,imgFileName => 'DBRIssues.jpg'
);
trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 108
,description => 'Trouble Ticket 108'
,submit_dts => '2009-01-12 00:00:00'
,status => 'OPEN'
,docFileName => 'New_108.doc'
,imgFileName => 'Unresolved.jpg'
);
trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 109
,description => 'Trouble Ticket 109'
,submit_dts => '2009-01-02 00:00:00'
,status => 'OPEN'
,docFileName => 'New_109.doc'
,imgFileName => 'Unresolved.jpg'
);
trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 110
,description => 'Trouble Ticket 110'
,submit_dts => '2009-01-14 12:45:00'
,status => 'OPEN'
,docFileName => 'New_110.doc'
,imgFileName => 'DBRIssues.jpg'
);
trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 201
,description => 'Trouble Ticket 201'
,submit_dts => '2008-12-31 23:45:00'
,status => 'PENDING'
,docFileName => 'New_101.doc'
,imgFileName => 'DBRIssues.jpg'
);
trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 202
,description => 'Trouble Ticket 202'
,submit_dts => '2009-01-04 00:00:00'
,status => 'OPEN'
,docFileName => 'New_102.doc'
,imgFileName => 'Unresolved.jpg'
);
trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 203
,description => 'Trouble Ticket 203'
,submit_dts => '2009-01-02 00:00:00'
,status => 'CLOSED'
,docFileName => 'New_103.doc'
,imgFileName => 'Unresolved.jpg'
);
trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 204
,description => 'Trouble Ticket 204'
,submit_dts => '2009-01-14 12:30:00'
,status => 'OPEN'
,docFileName => 'New_104.doc'
,imgFileName => 'DBRIssues.jpg'
);
trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 205
,description => 'Trouble Ticket 205'
,submit_dts => '2009-01-09 00:00:00'
,status => 'OPEN'
,docFileName => 'New_105.doc'
,imgFileName => 'Unresolved.jpg'
);
trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 206
,description => 'Trouble Ticket 206'
,submit_dts => '2009-01-11 00:00:00'
,status => 'PENDING'
,docFileName => 'New_106.doc'
,imgFileName => 'Unresolved.jpg'
);
trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 207
,description => 'Trouble Ticket 207'
,submit_dts => '2009-01-16 00:00:00'
,status => 'OPEN'
,docFileName => 'New_107.doc'
,imgFileName => 'DBRIssues.jpg'
);
trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 208
,description => 'Trouble Ticket 208'
,submit_dts => '2009-01-12 00:00:00'
,status => 'OPEN'
,docFileName => 'New_108.doc'
,imgFileName => 'Unresolved.jpg'
);
trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 209
,description => 'Trouble Ticket 209'
,submit_dts => '2009-01-02 00:00:00'
,status => 'PENDING'
,docFileName => 'New_109.doc'
,imgFileName => 'Unresolved.jpg'
);
trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 210
,description => 'Trouble Ticket 210'
,submit_dts => '2009-01-14 12:45:00'
,status => 'OPEN'
,docFileName => 'New_110.doc'
,imgFileName => 'DBRIssues.jpg'
);
trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 301
,description => 'Trouble Ticket 301'
,submit_dts => '2008-12-31 23:45:00'
,status => 'CLOSED'
,docFileName => 'New_101.doc'
,imgFileName => 'DBRIssues.jpg'
);
trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 302
,description => 'Trouble Ticket 302'
,submit_dts => '2009-01-04 00:00:00'
,status => 'OPEN'
,docFileName => 'New_102.doc'
,imgFileName => 'Unresolved.jpg'
);
trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 303
,description => 'Trouble Ticket 303'
,submit_dts => '2009-01-02 00:00:00'
,status => 'OPEN'
,docFileName => 'New_103.doc'
,imgFileName => 'Unresolved.jpg'
);
trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 304
,description => 'Trouble Ticket 304'
,submit_dts => '2009-01-14 12:30:00'
,status => 'CLOSED'
,docFileName => 'New_104.doc'
,imgFileName => 'DBRIssues.jpg'
);
trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 305
,description => 'Trouble Ticket 305'
,submit_dts => '2009-01-09 00:00:00'
,status => 'PENDING'
,docFileName => 'New_105.doc'
,imgFileName => 'Unresolved.jpg'
);
trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 306
,description => 'Trouble Ticket 306'
,submit_dts => '2009-01-11 00:00:00'
,status => 'CLOSED'
,docFileName => 'New_106.doc'
,imgFileName => 'Unresolved.jpg'
);
trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 307
,description => 'Trouble Ticket 307'
,submit_dts => '2009-01-16 00:00:00'
,status => 'OPEN'
,docFileName => 'New_107.doc'
,imgFileName => 'DBRIssues.jpg'
);
trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 308
,description => 'Trouble Ticket 308'
,submit_dts => '2009-01-12 00:00:00'
,status => 'OPEN'
,docFileName => 'New_108.doc'
,imgFileName => 'Unresolved.jpg'
);
trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 309
,description => 'Trouble Ticket 309'
,submit_dts => '2009-01-02 00:00:00'
,status => 'CLOSED'
,docFileName => 'New_109.doc'
,imgFileName => 'Unresolved.jpg'
);
trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 310
,description => 'Trouble Ticket 310'
,submit_dts => '2009-01-14 12:45:00'
,status => 'CLOSED'
,docFileName => 'New_110.doc'
,imgFileName => 'DBRIssues.jpg'
);
COMMIT;
END;
/
-- 收集優化器統計信息
BEGIN
DBMS_STATS.GATHER_SCHEMA_STATS(ownname => 'TRBTKT', CASCADE => TRUE);
END;
/
有效地從BasicFile移植到SecureFile

現在已經將這些表進行了分區，以便在數據倉庫環境更有效地使用，我也已經考慮過如何將LOB從BasicFile格式快速有效地轉換成對應的SecureFile格式，幸運的是，Oracle 11g提供了兩個方法：分區交換和在線重定義。

1、分區交換

分區交換載入(Partition Exchange Load，即PDL)有時也叫做分區轉動，包含創建一個非分區表，它的格式和內容完全匹配目標分區表想要的分區，一旦原始表創建好了，就可以開始可已經分區的表的目標分區進行交換了，這個方法確實提供了許多好處，換句話說，原始表的本地索引在交換期間得到維護，它可以並行執行，這個方法可以重復多次以填充每個分區，它的主要缺點是接收數據的分區在進行交換時必須離線。

2、在線重定義

Oracle推薦使用DBMS_REDEFINITION包對源表和目標表執行在線重定義，因為它實現了分區交換方法相同的目標。但它不需要在重定義過程中將目標離線。在線重定義可以在表級也可以在分區級執行，它也可以同時並行為多個分區執行，我喜歡在線重定義的特性是在這個過程成功執行完畢後，源和目標對象將對真正地在數據庫數據目錄中轉換定義，這意味著任何引用了新對象名的PL/SQL對象都不需要進行任何修改。清單3顯示了如何使用TRBTKT.TICKETS表作為源對象，使用TRBTKT.SECURE_TICKETS表作為目標對象進行在線重定義的。從BasicFile LOB轉換到SecureFile LOB最後一個注意事項是：一旦轉換完成，LOB就不能再降級回到BasicFile LOB了。

管理SecureFile元數據

這些新的SecureFile特性無疑擴展了LOB的能力，對於DBA而言，也需要注意幾個在傳統的BasicFile LOB上增加的額外屬性，幸運的是，Oracle 11g提供了多個方法跟蹤BasicFile和SecureFile LOB的元數據。

1、數據字典視圖

Oracle 11g也更新了多個關於SecureFile信息的數據字典視圖，下面列出這些做了變動的視圖。

清單4顯示了多條SQL*Plus查詢，它們使用了這些數據字典視圖返回關於SecureFile元數據的信息，報告1顯示了從這些查詢返回的結果。

清單4 查詢BasicFile和SecureFile LOB的元數據

SET PAGESIZE 1000
SET LINESIZE 140
-- 視圖: DBA_SEGMENTS
--顯示關於BasicFile 和SecureFile 段的元數據
TTITLE 'LOB Segment Information|(from DBA_SEGMENTS)'
COL segment_name FORMAT A30 HEADING 'Segment Name'
COL segment_type FORMAT A20 HEADING 'Segment|Type'
COL segment_subtype FORMAT A20 HEADING 'Segment|SubType'
COL partition_name FORMAT A12 HEADING 'Partition|Name'
COL tablespace_name FORMAT A12 HEADING 'Tablespace'
SELECT
segment_name
,segment_type
,segment_subtype
,partition_name
,tablespace_name
FROM dba_segments
WHERE owner = 'TRBTKT'
ORDER BY segment_name
;
TTITLE OFF
-- 視圖: DBA_LOBS
--顯示關於BasicFile和SecureFile LOB的元數據
TTITLE 'BasicFile and SecureFile LOBs Metadata|(from DBA_LOBS)'
COL table_name FORMAT A14 HEADING 'Table'
COL segment_name FORMAT A26 HEADING 'Segment'
COL column_name FORMAT A10 HEADING 'Column'
COL tablespace_name FORMAT A12 HEADING 'Tablespace'
COL loggingFORMAT A08 HEADING 'Logging'
COL cache FORMAT A10 HEADING 'Cacheing'
COL in_row FORMAT A07 HEADING 'Stored|In Row'
COL encryptFORMAT A07 HEADING 'Encryp-|tion'
COL compression FORMAT A07 HEADING 'Compre-|ssion'
COL deduplication FORMAT A08 HEADING 'DeDupli-|cation'
COL securefile FORMAT A07 HEADING 'Secure|File?'
COL partitioned FORMAT A07 HEADING 'Parti-|tioned'
SELECT
table_name
,column_name
,segment_name
,tablespace_name
,logging
,cache
,in_row
,encrypt
,compression
,deduplication
,securefile
,partitioned
FROM dba_lobs
WHERE owner = 'TRBTKT'
ORDER BY table_name, column_name
;
TTITLE OFF
--視圖: DBA_PART_LOBS
--顯示BasicFile和SecureFile LOB的默認值
TTITLE 'BasicFile and SecureFile Partitioned LOB Default Settings|(from DBA_PART_LOBS)'
COL table_name FORMAT A20 HEADING 'Table'
COL column_nameFORMAT A12 HEADING 'Column'
COL def_cache FORMAT A12 HEADING 'Cached'
COL def_tablespace_name FORMAT A12 HEADING 'Tablespace'
COL def_securefile FORMAT A12 HEADING 'SecureFile'
COL def_encryptFORMAT A12 HEADING 'Encrypted'
COL def_compress FORMAT A12 HEADING 'Compressed'
COL def_deduplicate FORMAT A12 HEADING 'DeDuplicated'
SELECT
table_name
,column_name
,def_cache
,def_tablespace_name
,def_securefile
,def_compress
,def_deduplicate
,def_encrypt
FROM dba_part_lobs
WHERE table_owner = 'TRBTKT'
ORDER BY table_name, column_name
;
TTITLE OFF
--視圖: DBA_LOB_PARTITIONS
--在獨立的LOB級描述BasicFile和SecureFile設置
TTITLE 'BasicFile and SecureFile LOB Partitions|(from DBA_LOB_PARTITIONS)'
COL table_name FORMAT A16 HEADING 'Table'
COL column_name FORMAT A12 HEADING 'Column'
COL partition_name FORMAT A12 HEADING 'Stored in|Partition'
COL cache FORMAT A10 HEADING 'Cacheing'
COL in_row FORMAT A10 HEADING 'Stored|In Row'
COL encryptFORMAT A10 HEADING 'Encrypted'
COL compression FORMAT A10 HEADING 'Compressed'
COL deduplication FORMAT A10 HEADING 'DeDupli-|cated'
COL securefile FORMAT A10 HEADING 'SecureFile?'
SELECT
table_name
,column_name
,partition_name
,cache
,in_row
,encrypt
,compression
,deduplication
,securefile
FROM dba_lob_partitions
WHERE table_owner = 'TRBTKT'
ORDER BY table_name, column_name
;
TTITLE OFF
報告1 從BasicFIle和SecureFile LOB元數據報告返回的結果

Segment Segment Partition
Segment Name Type SubType NameTablespace
------------------------- -------------------- -------------------- ------------ ------------
SECURE_TICKETS TABLE PARTITION ASSM STS_PENDING USERS
SECURE_TICKETS TABLE PARTITION ASSM STS_CLOSED USERS
SECURE_TICKETS TABLE PARTITION ASSM STS_OPEN USERS
SECURE_TICKETS TABLE PARTITION ASSM STS_OTHER USERS
SYS_IL0000072118C00005$$ INDEX PARTITION ASSM SYS_IL_P180 BASICFILES
SYS_IL0000072118C00005$$ INDEX PARTITION ASSM SYS_IL_P179 BASICFILES
SYS_IL0000072118C00005$$ INDEX PARTITION ASSM SYS_IL_P178 BASICFILES
SYS_IL0000072118C00005$$ INDEX PARTITION ASSM SYS_IL_P177 BASICFILES
SYS_IL0000072118C00006$$ INDEX PARTITION ASSM SYS_IL_P185 BASICFILES
SYS_IL0000072118C00006$$ INDEX PARTITION ASSM SYS_IL_P188 BASICFILES
SYS_IL0000072118C00006$$ INDEX PARTITION ASSM SYS_IL_P187 BASICFILES
SYS_IL0000072118C00006$$ INDEX PARTITION ASSM SYS_IL_P186 BASICFILES
SYS_IL0000072144C00005$$ INDEX PARTITION ASSM SYS_IL_P194 SECUREFILES
SYS_IL0000072144C00005$$ INDEX PARTITION ASSM SYS_IL_P193 SECUREFILES
SYS_IL0000072144C00005$$ INDEX PARTITION ASSM SYS_IL_P195 SECUREFILES
SYS_IL0000072144C00005$$ INDEX PARTITION ASSM SYS_IL_P196 SECUREFILES
SYS_IL0000072144C00006$$ INDEX PARTITION ASSM SYS_IL_P204 SECUREFILES
SYS_IL0000072144C00006$$ INDEX PARTITION ASSM SYS_IL_P203 SECUREFILES
SYS_IL0000072144C00006$$ INDEX PARTITION ASSM SYS_IL_P202 SECUREFILES
SYS_IL0000072144C00006$$ INDEX PARTITION ASSM SYS_IL_P201 SECUREFILES
SYS_LOB0000072118C00005$$ LOB PARTITION ASSM SYS_LOB_P173 BASICFILES
SYS_LOB0000072118C00005$$ LOB PARTITION ASSM SYS_LOB_P176 BASICFILES
SYS_LOB0000072118C00005$$ LOB PARTITION ASSM SYS_LOB_P175 BASICFILES
SYS_LOB0000072118C00005$$ LOB PARTITION ASSM SYS_LOB_P174 BASICFILES
SYS_LOB0000072118C00006$$ LOB PARTITION ASSM SYS_LOB_P184 BASICFILES
SYS_LOB0000072118C00006$$ LOB PARTITION ASSM SYS_LOB_P183 BASICFILES
SYS_LOB0000072118C00006$$ LOB PARTITION ASSM SYS_LOB_P181 BASICFILES
SYS_LOB0000072118C00006$$ LOB PARTITION ASSM SYS_LOB_P182 BASICFILES
SYS_LOB0000072144C00005$$ LOB PARTITION SECUREFILE SYS_LOB_P191 SECUREFILES
SYS_LOB0000072144C00005$$ LOB PARTITION SECUREFILE SYS_LOB_P192 SECUREFILES
SYS_LOB0000072144C00005$$ LOB PARTITION SECUREFILE SYS_LOB_P189 SECUREFILES
SYS_LOB0000072144C00005$$ LOB PARTITION SECUREFILE SYS_LOB_P190 SECUREFILES
SYS_LOB0000072144C00006$$ LOB PARTITION SECUREFILE SYS_LOB_P198 SECUREFILES
SYS_LOB0000072144C00006$$ LOB PARTITION SECUREFILE SYS_LOB_P199 SECUREFILES
SYS_LOB0000072144C00006$$ LOB PARTITION SECUREFILE SYS_LOB_P197 SECUREFILES
SYS_LOB0000072144C00006$$ LOB PARTITION SECUREFILE SYS_LOB_P200 SECUREFILES
TICKETS TABLE PARTITION ASSM STS_PENDING USERS
TICKETS TABLE PARTITION ASSM STS_OTHER USERS
TICKETS TABLE PARTITION ASSM STS_OPEN USERS
TICKETS TABLE PARTITION ASSM STS_CLOSED USERS
TICKETS_PK_IDX INDEX ASSM USERS

BasicFile和SecureFile LOB元數據
(來自DBA_LOBS)

Stored Encryp- Compre- DeDupli- Secure Parti-
Table Column Segment Tablespace Logging Cacheing In Row tion ssion cation File? tioned
-------------- ---------- -------------------------- ------------ -------- ---------- ------- ------- ------- -------- ------- -------
SECURE_TICKETS DOCUMENT SYS_LOB0000072118C00005$$ BASICFILES NONE NOYES NONE NONE NONE NO YES
SECURE_TICKETS SCRNIMG SYS_LOB0000072118C00006$$ BASICFILES NONE NOYES NONE NONE NONE NO YES
TICKETS DOCUMENT SYS_LOB0000072144C00005$$ SECUREFILES NONE YES NO NO NO NO YES YES
TICKETS SCRNIMG SYS_LOB0000072144C00006$$ SECUREFILES NONE CACHEREADS NO NO NO NO YES YES

BasicFile和SecureFile分區LOB默認設置
(來自DBA_PART_LOBS)

Table Column Cached Tablespace SecureFile Compressed DeDuplicated Encrypted
----- ------------ ------------ ------------ ------------ ------------ ------------ ------------
SECURE_TICKETS DOCUMENT NO BASICFILES NO NONENONENONE
SECURE_TICKETS SCRNIMG NO BASICFILES NO NONENONENONE
TICKETS DOCUMENT YES SECUREFILES YES NO NO NO
TICKETS SCRNIMG CACHEREADS SECUREFILES YES NO NO NO

BasicFile和SecureFile LOB分區
(來自DBA_LOB_PARTITIONS)

Stored in StoredDeDupli-
Table Column Partition Cacheing In Row Encrypted Compressed cated SecureFile
---- ------------ ------------ ---------- ---------- ---------- ---------- ---------- ----------
SECURE_TICKETS DOCUMENT STS_OTHER NOYES NONE NONE NONE NO
SECURE_TICKETS DOCUMENT STS_CLOSED NOYES NONE NONE NONE NO
SECURE_TICKETS DOCUMENT STS_OPEN NOYES NONE NONE NONE NO
SECURE_TICKETS DOCUMENT STS_PENDING NOYES NONE NONE NONE NO
SECURE_TICKETS SCRNIMG STS_OTHER NOYES NONE NONE NONE NO
SECURE_TICKETS SCRNIMG STS_CLOSED NOYES NONE NONE NONE NO
SECURE_TICKETS SCRNIMG STS_PENDING NOYES NONE NONE NONE NO
SECURE_TICKETS SCRNIMG STS_OPEN NOYES NONE NONE NONE NO
TICKETS DOCUMENT STS_OTHER YES NONOHIGH LOB YES
TICKETS DOCUMENT STS_PENDING YES NONONONOYES
TICKETS DOCUMENT STS_CLOSED YES NONOMEDIUM LOB YES
TICKETS DOCUMENT STS_OPEN YES NONONONOYES
TICKETS SCRNIMG STS_PENDING CACHEREADS NONOMEDIUM LOB YES
TICKETS SCRNIMG STS_OPEN CACHEREADS NONOMEDIUM NOYES
TICKETS SCRNIMG STS_CLOSED CACHEREADS NONOHIGH LOB YES
TICKETS SCRNIMG STS_OTHER CACHEREADS NONOHIGH LOB YES2、DBMS_SPACE

這是另一個Oracle古老支持包，它的SPACE_USAGE存儲過程提供關於BasicFile和SecureFile LOB的空間利用率，我在TRBTKT.PKG_SECUREFILES包中引入了兩個存儲過程：CALC_SPACE_BASICFILES和CALC_SPACE_SECUREFILES。但遺憾的是，這個功能只能在啟用了自動段空間管理(ASSM)的表空間上使用，而且，它也不會考慮任何BasicFile LOB塊的空間利用率，在清單5中，我對表TRBTKT.TICKETS和TRBTKT.SECURE_TICKETS分別調用了這些存儲過程，並返回了相應的輸出。

清單5 確定BasicFile和SecureFile LOB的空間利用率
SET SERVEROUTPUT ON
-- BasicFile存儲利用率:
BEGIN
trbtkt.pkg_securefiles.calc_space_basicfiles (
ownname => 'TRBTKT'
,tabname => 'SECURE_TICKETS'
,colname => 'DOCUMENT'
,partname => 'STS_OPEN'
);
trbtkt.pkg_securefiles.calc_space_basicfiles (
ownname => 'TRBTKT'
,tabname => 'SECURE_TICKETS'
,colname => 'DOCUMENT'
,partname => 'STS_PENDING'
);
trbtkt.pkg_securefiles.calc_space_basicfiles (
ownname => 'TRBTKT'
,tabname => 'SECURE_TICKETS'
,colname => 'DOCUMENT'
,partname => 'STS_CLOSED'
);
trbtkt.pkg_securefiles.calc_space_basicfiles (
ownname => 'TRBTKT'
,tabname => 'SECURE_TICKETS'
,colname => 'DOCUMENT'
,partname => 'STS_OTHER'
);
trbtkt.pkg_securefiles.calc_space_basicfiles (
ownname => 'TRBTKT'
,tabname => 'SECURE_TICKETS'
,colname => 'SCRNIMG'
,partname => 'STS_OPEN'
);
trbtkt.pkg_securefiles.calc_space_basicfiles (
ownname => 'TRBTKT'
,tabname => 'SECURE_TICKETS'
,colname => 'SCRNIMG'
,partname => 'STS_PENDING'
);
trbtkt.pkg_securefiles.calc_space_basicfiles (
ownname => 'TRBTKT'
,tabname => 'SECURE_TICKETS'
,colname => 'SCRNIMG'
,partname => 'STS_CLOSED'
);
trbtkt.pkg_securefiles.calc_space_basicfiles (
ownname => 'TRBTKT'
,tabname => 'SECURE_TICKETS'
,colname => 'SCRNIMG'
,partname => 'STS_OTHER'
);
END;
/
============================================================
Space Usage for BasicFile LOB TRBTKT.SECURE_TICKETS.DOCUMENT
Partition Name: STS_OPEN
------------------------------------------------------------
Full Blocks: 123 KB: .96
Unformatted Blocks: 379 KB: 2.96 
Total Blocks: 123 Total KB: .96  
============================================================
============================================================
Space Usage for BasicFile LOB TRBTKT.SECURE_TICKETS.DOCUMENT
Partition Name: STS_PENDING      
------------------------------------------------------------
Full Blocks: 20 KB: .16 
Unformatted Blocks: 482 KB: 3.77 
Total Blocks: 20 Total KB: .16   
============================================================
============================================================
Space Usage for BasicFile LOB TRBTKT.SECURE_TICKETS.DOCUMENT
Partition Name: STS_CLOSED       
------------------------------------------------------------
Full Blocks: 37 KB: .29 
Unformatted Blocks: 465 KB: 3.63 
Total Blocks: 37 Total KB: .29   
============================================================
============================================================
Space Usage for BasicFile LOB TRBTKT.SECURE_TICKETS.DOCUMENT
Partition Name: STS_OTHER        
------------------------------------------------------------
Full Blocks: 0 KB: 0    
Unformatted Blocks: 0 KB: 0      
Total Blocks: 0 Total KB: 0      
============================================================
============================================================
Space Usage for BasicFile LOB TRBTKT.SECURE_TICKETS.SCRNIMG 
Partition Name: STS_OPEN
------------------------------------------------------------
Full Blocks: 420 KB: 3.28        
Unformatted Blocks: 82 KB: .64   
Total Blocks: 420 Total KB: 3.28 
============================================================
============================================================
Space Usage for BasicFile LOB TRBTKT.SECURE_TICKETS.SCRNIMG 
Partition Name: STS_PENDING      
------------------------------------------------------------
Full Blocks: 66 KB: .52 
Unformatted Blocks: 436 KB: 3.41 
Total Blocks: 66 Total KB: .52   
============================================================
============================================================
Space Usage for BasicFile LOB TRBTKT.SECURE_TICKETS.SCRNIMG 
Partition Name: STS_CLOSED       
------------------------------------------------------------
Full Blocks: 144 KB: 1.13        
Unformatted Blocks: 358 KB: 2.8  
Total Blocks: 144 Total KB: 1.13 
============================================================
============================================================
Space Usage for BasicFile LOB TRBTKT.SECURE_TICKETS.SCRNIMG 
Partition Name: STS_OTHER        
------------------------------------------------------------
Full Blocks: 0 KB: 0    
Unformatted Blocks: 0 KB: 0      
Total Blocks: 0 Total KB: 0      
============================================================
-- SecureFile存儲利用率:
BEGIN
trbtkt.pkg_securefiles.calc_space_securefiles (
ownname => 'TRBTKT'
,tabname => 'TICKETS'
,colname => 'DOCUMENT'
,partname => 'STS_OPEN'
);
trbtkt.pkg_securefiles.calc_space_securefiles (
ownname => 'TRBTKT'
,tabname => 'TICKETS'
,colname => 'DOCUMENT'
,partname => 'STS_PENDING'
);
trbtkt.pkg_securefiles.calc_space_securefiles (
ownname => 'TRBTKT'
,tabname => 'TICKETS'
,colname => 'DOCUMENT'
,partname => 'STS_CLOSED'
);
trbtkt.pkg_securefiles.calc_space_securefiles (
ownname => 'TRBTKT'
,tabname => 'TICKETS'
,colname => 'DOCUMENT'
,partname => 'STS_OTHER'
);
trbtkt.pkg_securefiles.calc_space_securefiles (
ownname => 'TRBTKT'
,tabname => 'TICKETS'
,colname => 'SCRNIMG'
,partname => 'STS_OPEN'
);
trbtkt.pkg_securefiles.calc_space_securefiles (
ownname => 'TRBTKT'
,tabname => 'TICKETS'
,colname => 'SCRNIMG'
,partname => 'STS_PENDING'
);
trbtkt.pkg_securefiles.calc_space_securefiles (
ownname => 'TRBTKT'
,tabname => 'TICKETS'
,colname => 'SCRNIMG'
,partname => 'STS_CLOSED'
);
trbtkt.pkg_securefiles.calc_space_securefiles (
ownname => 'TRBTKT'
,tabname => 'TICKETS'
,colname => 'SCRNIMG'
,partname => 'STS_OTHER'
);
END;
/
============================================================
Space Usage for SecureFile LOB TRBTKT.TICKETS.DOCUMENT      
Partition Name: STS_OPEN
------------------------------------------------------------
Segment Blocks: 1024 KB: 8192    
Used Blocks: 124 KB: 992
Expired Blocks: 882 KB: 7056     
Unexpired Blocks: 0 KB: 0        
============================================================
============================================================
Space Usage for SecureFile LOB TRBTKT.TICKETS.DOCUMENT      
Partition Name: STS_PENDING      
------------------------------------------------------------
Segment Blocks: 1024 KB: 8192    
Used Blocks: 21 KB: 168 
Expired Blocks: 985 KB: 7880     
Unexpired Blocks: 0 KB: 0        
============================================================
============================================================
Space Usage for SecureFile LOB TRBTKT.TICKETS.DOCUMENT      
Partition Name: STS_CLOSED       
------------------------------------------------------------
Segment Blocks: 1024 KB: 8192    
Used Blocks: 13 KB: 104 
Expired Blocks: 993 KB: 7944     
Unexpired Blocks: 0 KB: 0        
============================================================
============================================================
Space Usage for SecureFile LOB TRBTKT.TICKETS.DOCUMENT      
Partition Name: STS_OTHER        
------------------------------------------------------------
Segment Blocks: 512 KB: 4096     
Used Blocks: 501 KB: 4008        
Expired Blocks: 0 KB: 0 
Unexpired Blocks: 0 KB: 0        
============================================================
============================================================
Space Usage for SecureFile LOB TRBTKT.TICKETS.SCRNIMG       
Partition Name: STS_OPEN
------------------------------------------------------------
Segment Blocks: 2560 KB: 20480   
Used Blocks: 405 KB: 3240        
Expired Blocks: 2134 KB: 17072   
Unexpired Blocks: 0 KB: 0        
============================================================
============================================================
Space Usage for SecureFile LOB TRBTKT.TICKETS.SCRNIMG       
Partition Name: STS_PENDING      
------------------------------------------------------------
Segment Blocks: 1024 KB: 8192    
Used Blocks: 62 KB: 496 
Expired Blocks: 944 KB: 7552     
Unexpired Blocks: 0 KB: 0        
============================================================
============================================================
Space Usage for SecureFile LOB TRBTKT.TICKETS.SCRNIMG       
Partition Name: STS_CLOSED       
------------------------------------------------------------
Segment Blocks: 1024 KB: 8192    
Used Blocks: 142 KB: 1136        
Expired Blocks: 864 KB: 6912     
Unexpired Blocks: 0 KB: 0        
============================================================
============================================================
Space Usage for SecureFile LOB TRBTKT.TICKETS.SCRNIMG       
Partition Name: STS_OTHER        
------------------------------------------------------------
Segment Blocks: 512 KB: 4096     
Used Blocks: 501 KB: 4008        
Expired Blocks: 0 KB: 0 
Unexpired Blocks: 0 KB: 0        
============================================================

SET SERVEROUTPUT ON修改SecureFile屬性

當我創建TRBTKT.SECURE_TICKETS表時，你可能注意到我為每個LOB列在它們對應的分區中執行壓縮和重復刪除，重要的是我還使用了ALTER TABLE語句進行修正，另外，如果需要的話，我還可以在每個LOB獨立的分區上應用改變到SecureFile LOB。清單6中的代碼顯示了4個修改TRBTKT.TICKETS表的SecureFile LOB屬性的例子，注意這個表現在已經用清單3中的代碼和TRBTKT.SECURE_TICKETS表執行了交換，我也從DBA_PART_LOBS創建了一個報告顯示在修改這些LOB屬性前後的狀態，結果輸出如報告2所示。

清單6 管理SecureFile LOB屬性

SQL> ALTER TABLE TRBTKT.TICKETS
SQL> MODIFY LOB(DOCUMENT) (NOCOMPRESS);

Table altered.

SQL> ALTER TABLE TRBTKT.TICKETS
SQL> MODIFY LOB(SCRNIMG) (KEEP_DUPLICATES);

Table altered.

SQL> ALTER TABLE TRBTKT.TICKETS
SQL> MODIFY PARTITION STS_PENDING LOB(SCRNIMG) (COMPRESS HIGH);
Table altered.
SQL> ALTER TABLE TRBTKT.TICKETS
SQL> MODIFY PARTITION STS_PENDING LOB(DOCUMENT) (DEDUPLICATE);
Table altered.
報告2 修改許多SecureFile LOB後查詢DBA_LOB_PARTITIONS返回的結果

BasicFile and SecureFile LOB Partitions
(from DBA_LOB_PARTITIONS)
Stored in StoredDeDupli-
Table Column Partition Cacheing In Row Encrypted Compressed cated SecureFile
---------------- ------------ ------------ ---------- ---------- ---------- ---------- --------
SECURE_TICKETS DOCUMENT STS_OTHER NOYES NONE NONE NONE NO
SECURE_TICKETS DOCUMENT STS_CLOSED NOYES NONE NONE NONE NO
SECURE_TICKETS DOCUMENT STS_OPEN NOYES NONE NONE NONE NO
SECURE_TICKETS DOCUMENT STS_PENDING NOYES NONE NONE NONE NO
SECURE_TICKETS SCRNIMG STS_OTHER NOYES NONE NONE NONE NO
SECURE_TICKETS SCRNIMG STS_CLOSED NOYES NONE NONE NONE NO
SECURE_TICKETS SCRNIMG STS_PENDING NOYES NONE NONE NONE NO
SECURE_TICKETS SCRNIMG STS_OPEN NOYES NONE NONE NONE NO
TICKETS DOCUMENT STS_OTHER YES NONONOLOB YES
TICKETS DOCUMENT STS_PENDING YES NONONOLOB YES
TICKETS DOCUMENT STS_CLOSED YES NONONOLOB YES
TICKETS DOCUMENT STS_OPEN YES NONONONOYES
TICKETS SCRNIMG STS_PENDING CACHEREADS NONOHIGH NOYES
TICKETS SCRNIMG STS_OPEN CACHEREADS NONOMEDIUM NOYES
TICKETS SCRNIMG STS_CLOSED CACHEREADS NONOHIGH NOYES
TICKETS SCRNIMG STS_OTHER CACHEREADS NONOHIGH NOYES