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 deduplication FORMAT 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 deduplication FORMAT 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 deduplication FORMAT 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 deduplication FORMAT 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_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元数据(来自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分区LOB默认设置(来自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分区(来自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
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: .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: 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-Table Column Partition Cacheing In Row Encrypted Compressed cated SecureFile---------------- ------------ ------------ ---------- ---------- ---------- ---------- --------SECURE_TICKETS DOCUMENT STS_OTHER NOYES NONE NONE NONE NOSECURE_TICKETS DOCUMENT STS_CLOSED NOYES NONE NONE NONE NOSECURE_TICKETS DOCUMENT STS_OPEN NOYES NONE NONE NONE NOSECURE_TICKETS DOCUMENT STS_PENDING NOYES NONE NONE NONE NOSECURE_TICKETS SCRNIMG STS_OTHER NOYES NONE NONE NONE NOSECURE_TICKETS SCRNIMG STS_CLOSED NOYES NONE NONE NONE NOSECURE_TICKETS SCRNIMG STS_PENDING NOYES NONE NONE NONE NOSECURE_TICKETS SCRNIMG STS_OPEN NOYES NONE NONE NONE NOTICKETS DOCUMENT STS_OTHER YES NONONOLOB YESTICKETS DOCUMENT STS_PENDING YES NONONOLOB YESTICKETS DOCUMENT STS_CLOSED YES NONONOLOB YESTICKETS DOCUMENT STS_OPEN YES NONONONOYESTICKETS SCRNIMG STS_PENDING CACHEREADS NONOHIGH NOYESTICKETS SCRNIMG STS_OPEN CACHEREADS NONOMEDIUM NOYESTICKETS SCRNIMG STS_CLOSED CACHEREADS 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