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，然后執行了一條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。

為了便于說明，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_pendingVALUES ('PENDING'),PARTITION sts_closedVALUES ('CLOSED'),PARTITION sts_otherVALUES (DEFAULT)); --注釋COMMENT ON table trbtkt.ticketsIS 'Contains Trouble Ticket transaction data';COMMENT ON COLUMN trbtkt.tickets.tkt_idIS 'Unique identifier for a Trouble Ticket';COMMENT ON COLUMN trbtkt.tickets.descriptionIS 'Trouble Ticket Description';COMMENT ON COLUMN trbtkt.tickets.submit_dtmIS 'Trouble Ticket Submission Time Stamp';COMMENT ON COLUMN trbtkt.tickets.statusIS 'Trouble Ticket Status';COMMENT ON COLUMN trbtkt.tickets.documentIS 'Large Object (LOB) that contains a microsoft Word document that provides detailed information about a Trouble Ticket';COMMENT ON COLUMN trbtkt.tickets.scrnimgIS '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_idxON trbtkt.tickets(tkt_id)TABLESPACE users;ALTER table trbtkt.ticketsADD CONSTRAINT tickets_pkPRIMARY 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，基于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 securefilesDISABLE STORAGE IN ROWCACHE),LOB(scrnimg);STORE AS SECUREFILE (TABLESPACE securefilesDISABLE STORAGE IN ROWCACHE 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_pendingVALUES ('PENDING')LOB (document) STORE AS SECUREFILE (KEEP_DUPLICATES NOCOMPRESS),LOB (scrnimg); STORE AS SECUREFILE (DEDUPLICATE COMPRESS),PARTITION sts_closedVALUES ('CLOSED')LOB (document) STORE AS SECUREFILE (DEDUPLICATE COMPRESS),LOB (scrnimg); STORE AS SECUREFILE (DEDUPLICATE COMPRESS HIGH),PARTITION sts_otherVALUES (DEFAULT)LOB (document) STORE AS SECUREFILE (DEDUPLICATE COMPRESS HIGH),LOB (scrnimg); STORE AS SECUREFILE (DEDUPLICATE COMPRESS HIGH)); --注釋COMMENT ON table trbtkt.secure_ticketsIS 'Contains Trouble Ticket transaction data';COMMENT ON COLUMN trbtkt.secure_tickets.tkt_idIS 'Unique identifier for a Trouble Ticket';COMMENT ON COLUMN trbtkt.secure_tickets.descriptionIS 'Trouble Ticket Description';COMMENT ON COLUMN trbtkt.secure_tickets.submit_dtmIS 'Trouble Ticket Submission Time Stamp';COMMENT ON COLUMN trbtkt.secure_tickets.statusIS 'Trouble Ticket Status';COMMENT ON COLUMN trbtkt.secure_tickets.documentIS 'Large Object (LOB) that contains a microsoft Word document that provides detailed information about a Trouble Ticket';COMMENT ON COLUMN trbtkt.secure_tickets.scrnimgIS '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 ONTRUNCATE table trbtkt.tickets; BEGINtrbtkt.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BEGINDBMS_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，它可以并行執行，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，它也可以同時并行為多個分區執行，我喜歡在線重定義的特性是在這個過程成功執行完畢后，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最后一個注意事項是：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，對于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也更新了多個關于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于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 1000SET LINESIZE 140 -- 視圖: DBA_SEGMENTS--顯示關于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_nameFROM dba_segmentsWHERE owner = 'TRBTKT'ORDER BY segment_name;TTITLE OFF-- 視圖: DBA_LOBS--顯示關于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 deduplicationFORMAT A08;;;HEADING 'DeDupli-|cation'COL securefile;;;FORMAT A07;;;HEADING 'Secure|File?'COL partitioned;;FORMAT A07;;;HEADING 'Parti-|tioned'SELECTtable_name,column_name,segment_name,tablespace_name,logging,cache,in_row,encrypt,compression,deduplication,securefile,partitionedFROM dba_lobsWHERE 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'SELECTtable_name,column_name,def_cache,def_tablespace_name,def_securefile,def_compress,def_deduplicate,def_encryptFROM dba_part_lobsWHERE 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 deduplicationFORMAT A10;;;HEADING 'DeDupli-|cated'COL securefile;;;FORMAT A10;;;HEADING 'SecureFile?'SELECTtable_name,column_name,partition_name,cache,in_row,encrypt,compression,deduplication,securefileFROM dba_lob_partitionsWHERE 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 SET PAGESIZE 1000SET LINESIZE 140 -- 視圖: DBA_SEGMENTS--顯示關于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_nameFROM dba_segmentsWHERE owner = 'TRBTKT'ORDER BY segment_name;TTITLE OFF-- 視圖: DBA_LOBS--顯示關于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 deduplicationFORMAT A08;;;HEADING 'DeDupli-|cation'COL securefile;;;FORMAT A07;;;HEADING 'Secure|File?'COL partitioned;;FORMAT A07;;;HEADING 'Parti-|tioned'SELECTtable_name,column_name,segment_name,tablespace_name,logging,cache,in_row,encrypt,compression,deduplication,securefile,partitionedFROM dba_lobsWHERE 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'SELECTtable_name,column_name,def_cache,def_tablespace_name,def_securefile,def_compress,def_deduplicate,def_encryptFROM dba_part_lobsWHERE 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 deduplicationFORMAT A10;;;HEADING 'DeDupli-|cated'COL securefile;;;FORMAT A10;;;HEADING 'SecureFile?'SELECTtable_name,column_name,partition_name,cache,in_row,encrypt,compression,deduplication,securefileFROM dba_lob_partitionsWHERE 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LOB段信息(來自DBA_SEGMENTS)Segment;;Segment;;Partition;Segment Name Type;;;;;SubType;;NameTablespace;;;;;------------------------- -------------------- -------------------- ------------ ------------;;;SECURE_TICKETS;;;;;table PARTITION;;;ASSM;;;;;STS_PENDING; USERS;SECURE_TICKETS;;;;;table PARTITION;;;ASSM;;;;;STS_CLOSEDUSERS;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_CLOSEDUSERS;TICKETS_PK_IDX;;;;;INDEX;;;;ASSMUSERS;BasicFile和SecureFile LOB元數據(來自DBA_LOBS)Stored; Encryp- Compre- DeDupli- Secure; Parti-;;;;table Column;;Segment; TablespaceLogging; CacheingIn Row; tion;ssioncationFile?tioned;;;;-------------- ---------- -------------------------- ------------ -------- ---------- ------- ------- ------- -------- ------- -------;;;SECURE_TICKETS DOCUMENTSYS_LOB0000072118C00005$$; BASICFILESNONE;;NOYES;;NONE;NONE;NONE;;NO;;;YES SECURE_TICKETS SCRNIMG;SYS_LOB0000072118C00006$$; BASICFILESNONE;;NOYES;;NONE;NONE;NONE;;NO;;;YES TICKETS;;;;;DOCUMENTSYS_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;;;;TablespaceSecureFileCompressedDeDuplicated Encrypted;;----- ------------ ------------ ------------ ------------ ------------ ------------ ------------; SECURE_TICKETS;;DOCUMENT;;NO; BASICFILESNO; NONENONENONE SECURE_TICKETS;;SCRNIMG;;;NO; BASICFILESNO; NONENONENONE TICKETS;;DOCUMENT;;YES SECUREFILES; YES NO; NO; NOTICKETS;;SCRNIMG;;;CACHEREADSSECUREFILES; YES NO; NO; NOBasicFile和SecureFile LOB分區(來自DBA_LOB_PARTITIONS)Stored in;;;StoredDeDupli-table;Column;;Partition;CacheingIn Row;;Encrypted; Compressed cated;;;SecureFile;;---- ------------ ------------ ---------- ---------- ---------- ---------- ---------- ----------;;SECURE_TICKETSDOCUMENT;;STS_OTHER;NOYES;;;;;NONE;;;;NONE;;;;NONE;;;;NO;SECURE_TICKETSDOCUMENT;;STS_CLOSEDNOYES;;;;;NONE;;;;NONE;;;;NONE;;;;NO;SECURE_TICKETSDOCUMENT;;STS_OPEN;;NOYES;;;;;NONE;;;;NONE;;;;NONE;;;;NO;SECURE_TICKETSDOCUMENT;;STS_PENDING; NOYES;;;;;NONE;;;;NONE;;;;NONE;;;;NO;SECURE_TICKETSSCRNIMG;;;STS_OTHER;NOYES;;;;;NONE;;;;NONE;;;;NONE;;;;NO;SECURE_TICKETSSCRNIMG;;;STS_CLOSEDNOYES;;;;;NONE;;;;NONE;;;;NONE;;;;NO;SECURE_TICKETSSCRNIMG;;;STS_PENDING; NOYES;;;;;NONE;;;;NONE;;;;NONE;;;;NO;SECURE_TICKETSSCRNIMG;;;STS_OPEN;;NOYES;;;;;NONE;;;;NONE;;;;NONE;;;;NO;TICKETS DOCUMENT;;STS_OTHER;YES;;;;;NONOHIGH;;;;LOB;;;;;YESTICKETS DOCUMENT;;STS_PENDING; YES;;;;;NONONONOYESTICKETS DOCUMENT;;STS_CLOSEDYES;;;;;NONOMEDIUM;;LOB;;;;;YESTICKETS DOCUMENT;;STS_OPEN;;YES;;;;;NONONONOYESTICKETS SCRNIMG;;;STS_PENDING; CACHEREADS NONOMEDIUM;;LOB;;;;;YESTICKETS SCRNIMG;;;STS_OPEN;;CACHEREADS NONOMEDIUM;;NOYESTICKETS SCRNIMG;;;STS_CLOSEDCACHEREADS NONOHIGH;;;;LOB;;;;;YESTICKETS SCRNIMG;;;STS_OTHER;CACHEREADS NONOHIGH;;;;LOB;;;;;YES2、DBMS_SPACE

這是另一個Oracle古老支持包，它的SPACE_USAGE存儲過程提供關于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，并返回了相應的輸出。

清單5 確定BasicFile和SecureFile LOB的空間利用率 SET SERVEROUTPUT ON-- BasicFile存儲利用率:BEGINtrbtkt.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.DOCUMENTPartition Name: STS_OPEN------------------------------------------------------------Full Blocks: 123 KB: .96Unformatted Blocks: 379 KB: 2.96 Total Blocks: 123 Total KB: .96; ========================================================================================================================Space Usage for BasicFile LOB TRBTKT.SECURE_TICKETS.DOCUMENTPartition 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.DOCUMENTPartition 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.DOCUMENTPartition 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: .64Total 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:BEGINtrbtkt.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: 992Expired 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: 20480Used Blocks: 405 KB: 3240;;;;;Expired Blocks: 2134 KB: 17072Unexpired 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屬性前后的狀態，結果輸出如報告2所示。

清單6 管理SecureFile LOB屬性

sql> ALTER table TRBTKT.TICKETSsql>;;MODIFY LOB(DOCUMENT) (NOCOMPRESS); table altered.sql> ALTER table TRBTKT.TICKETSsql>;;MODIFY LOB(SCRNIMG) (KEEP_DUPLICATES);table altered.sql> ALTER table TRBTKT.TICKETSsql>;;MODIFY PARTITION STS_PENDING LOB(SCRNIMG) (COMPRESS HIGH);table altered.sql> ALTER table TRBTKT.TICKETSsql>;;MODIFY PARTITION STS_PENDING LOB(DOCUMENT) (DEDUPLICATE);table altered.報告2 修改許多SecureFile LOB后查詢DBA_LOB_PARTITIONS返回的結果BasicFile and SecureFile LOB Partitions(from DBA_LOB_PARTITIONS)Stored in;;;StoredDeDupli-tableColumn;;;;Partition;CacheingIn Row;;Encrypted; Compressed cated;;;SecureFile---------------- ------------ ------------ ---------- ---------- ---------- ---------- --------SECURE_TICKETSDOCUMENT;;STS_OTHER;NOYES;;;;;NONE;;;;NONE;;;;NONE;;;;NOSECURE_TICKETSDOCUMENT;;STS_CLOSEDNOYES;;;;;NONE;;;;NONE;;;;NONE;;;;NOSECURE_TICKETSDOCUMENT;;STS_OPEN;;NOYES;;;;;NONE;;;;NONE;;;;NONE;;;;NOSECURE_TICKETSDOCUMENT;;STS_PENDING; NOYES;;;;;NONE;;;;NONE;;;;NONE;;;;NOSECURE_TICKETSSCRNIMG;;;STS_OTHER;NOYES;;;;;NONE;;;;NONE;;;;NONE;;;;NOSECURE_TICKETSSCRNIMG;;;STS_CLOSEDNOYES;;;;;NONE;;;;NONE;;;;NONE;;;;NOSECURE_TICKETSSCRNIMG;;;STS_PENDING; NOYES;;;;;NONE;;;;NONE;;;;NONE;;;;NOSECURE_TICKETSSCRNIMG;;;STS_OPEN;;NOYES;;;;;NONE;;;;NONE;;;;NONE;;;;NOTICKETS DOCUMENT;;STS_OTHER;YES;;;;;NONONOLOB;;;;;YESTICKETS DOCUMENT;;STS_PENDING; YES;;;;;NONONOLOB;;;;;YESTICKETS DOCUMENT;;STS_CLOSEDYES;;;;;NONONOLOB;;;;;YESTICKETS DOCUMENT;;STS_OPEN;;YES;;;;;NONONONOYESTICKETS SCRNIMG;;;STS_PENDING; CACHEREADS NONOHIGH;;;;NOYESTICKETS SCRNIMG;;;STS_OPEN;;CACHEREADS NONOMEDIUM;;NOYESTICKETS SCRNIMG;;;STS_CLOSEDCACHEREADS NONOHIGH;;;;NOYESTICKETS SCRNIMG;;;STS_OTHER;CACHEREADS NONOHIGH;;;;NOYES

最后，請記住任何對LOB屬性進行修改都只會影響到新創建的LOB或新修改的LOB，例如，將列TRBTKT.SECURE_TICKETS.SCRNIMG的壓縮方法從COMPRESS修改為NOCOMPRESS不會影響到現有的LOB條目。