Oracle中如何从BasicFile迁移到SecureFile

dn001 2009-05-30 18:01:09

我创建了一个新表TRBTKT.SECURE_TICKETS重新定义了原始表TRBTKT.TICKETS的结构，将原始的BasicFile LOB映射到对应的SecureFile LOB，然后执行了一条INSERT INTO … SELECT FROM DML语句将原始表中的内容传输到新表中。
在一个相对简单的应用程序环境中，这种载入方式足以应付，但目前在数据仓库和商业智能应用程序中广泛地使用了LOB，特别是存储那些包含了复杂商务交易的XML文档和医院信息系统捕获到的医疗影像数据。

为了便于说明，我使用清单1中的代码重新创建了这两个表，我使用了列表分区对这两个表进行了分区，在清单2中，我使用更大的数据重新载入TRBTKT.TICKETS表。

清单1 使用列表分区重新创建这两个表以模拟数据仓库环境

-- 重新创建表TRBTKT.TICKETS，这次包括了一个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));
--注释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';
-- 创建索引和约束CREATE UNIQUE INDEX trbtkt.tickets_pk_idxON trbtkt.tickets(tkt_id)TABLESPACE users;
ALTER table trbtkt.ticketsADD CONSTRAINT tickets_pkPRIMARY KEY (tkt_id);

--- 创建表TRBTKT.SECURE_TICKETS的一个改良版本，使用分区划分SecureFile LOB的存储，基于STATUS 的值设置合适的保留周期

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));
--注释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';

清单2 使用附加数据重新载入表TRBTKT.TICKETS

SET SERVEROUTPUT ONTRUNCATE 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;/-- 收集优化器统计信息BEGINDBMS_STATS.GATHER_SCHEMA_STATS(ownname => 'TRBTKT', CASCADE => TRUE);END;/有效地从BasicFile移植到SecureFile

现在已经将这些表进行了分区，以便在数据仓库环境更有效地使用，我也已经考虑过如何将LOB从BasicFile格式快速有效地转换成对应的SecureFile格式，幸运的是，Oracle 11g提供了两个方法：分区交换和在线重定义。

1、分区交换

分区交换载入(Partition exchange Load，即PDL)有时也叫做分区转动，包含创建一个非分区表，它的格式和内容完全匹配目标分区表想要的分区，一旦原始表创建好了，就可以开始可已经分区的表的目标分区进行交换了，这个方法确实提供了许多好处，换句话说，原始表的本地索引在交换期间得到维护，它可以并行执行，这个方法可以重复多次以填充每个分区，它的主要缺点是接收数据的分区在进行交换时必须离线。

2、在线重定义

Oracle推荐使用DBMS_REDEFINITION包对源表和目标表执行在线重定义，因为它实现了分区交换方法相同的目标。但它不需要在重定义过程中将目标离线。在线重定义可以在表级也可以在分区级执行，它也可以同时并行为多个分区执行，我喜欢在线重定义的特性是在这个过程成功执行完毕后，源和目标对象将对真正地在数据库数据目录中转换定义，这意味着任何引用了新对象名的PL/SQL对象都不需要进行任何修改。清单3显示了如何使用TRBTKT.TICKETS表作为源对象，使用TRBTKT.SECURE_TICKETS表作为目标对象进行在线重定义的。从BasicFile LOB转换到SecureFile LOB最后一个注意事项是：一旦转换完成，LOB就不能再降级回到BasicFile LOB了。

管理SecureFile元数据

这些新的SecureFile特性无疑扩展了LOB的能力，对于DBA而言，也需要注意几个在传统的BasicFile LOB上增加的额外属性，幸运的是，Oracle 11g提供了多个方法跟踪BasicFile和SecureFile LOB的元数据。

1、数据字典视图

oracle 11g也更新了多个关于SecureFile信息的数据字典视图，下面列出这些做了变动的视图。

清单4显示了多条SQL*Plus查询，它们使用了这些数据字典视图返回关于SecureFile元数据的信息，报告1显示了从这些查询返回的结果。

清单4 查询BasicFile和SecureFile LOB的元数据

SET PAGESIZE 1000SET LINESIZE 140 -- 视图: DBA_SEGMENTS--显示关于BasicFile 和SecureFile 段的元数据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-- 视图: DBA_LOBS--显示关于BasicFile和SecureFile LOB的元数据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--视图: DBA_PART_LOBS--显示BasicFile和SecureFile LOB的默认值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--视图: DBA_LOB_PARTITIONS--在独立的LOB级描述BasicFile和SecureFile设置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报告1 从BasicFIle和SecureFile LOB元数据报告返回的结果
SET PAGESIZE 1000SET LINESIZE 140 -- 视图: DBA_SEGMENTS--显示关于BasicFile 和SecureFile 段的元数据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-- 视图: DBA_LOBS--显示关于BasicFile和SecureFile LOB的元数据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--视图: DBA_PART_LOBS--显示BasicFile和SecureFile LOB的默认值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--视图: DBA_LOB_PARTITIONS--在独立的LOB级描述BasicFile和SecureFile设置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报告1 从BasicFIle和SecureFile LOB元数据报告返回的结果LOB段信息(来自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元数据(来自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分区LOB默认设置(来自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; NO
BasicFile和SecureFile LOB分区(来自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

这是另一个Oracle古老支持包，它的SPACE_USAGE存储过程提供关于BasicFile和SecureFile LOB的空间利用率，我在TRBTKT.PKG_SECUREFILES包中引入了两个存储过程：CALC_SPACE_BASICFILES和CALC_SPACE_SECUREFILES。但遗憾的是，这个功能只能在启用了自动段空间管理(ASSM)的表空间上使用，而且，它也不会考虑任何BasicFile LOB块的空间利用率，在清单5中，我对表TRBTKT.TICKETS和TRBTKT.SECURE_TICKETS分别调用了这些存储过程，并返回了相应的输出。

清单5 确定BasicFile和SecureFile LOB的空间利用率
SET SERVEROUTPUT ON-- BasicFile存储利用率: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存储利用率: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属性

当我创建TRBTKT.SECURE_TICKETS表时，你可能注意到我为每个LOB列在它们对应的分区中执行压缩和重复删除，重要的是我还使用了ALTER TABLE语句进行修正，另外，如果需要的话，我还可以在每个LOB独立的分区上应用改变到SecureFile LOB。清单6中的代码显示了4个修改TRBTKT.TICKETS表的SecureFile LOB属性的例子，注意这个表现在已经用清单3中的代码和TRBTKT.SECURE_TICKETS表执行了交换，我也从DBA_PART_LOBS创建了一个报告显示在修改这些LOB属性前后的状态，结果输出如报告2所示。

清单6 管理SecureFile LOB属性

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.报告2 修改许多SecureFile LOB后查询DBA_LOB_PARTITIONS返回的结果
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，请记住任何对LOB属性进行修改都只会影响到新创建的LOB或新修改的LOB，例如，将列TRBTKT.SECURE_TICKETS.SCRNIMG的压缩方法从COMPRESS修改为NOCOMPRESS不会影响到现有的LOB条目。