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Oracle中如何从BasicFile迁移到SecureFile

作者：开心果
运维 数据库运维 Oracle
Oracle 11g新的SecureFile存储特性扩展了大对象(LOB)的灵活性和容量，本文研究如何有效地从BasicFile迁移到SecureFile存储，如何测量SecureFile vs BasicFile LOB的效率，以及如何为SecureFile LOB使用不同的压缩和重复数据删除选项。

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_pending
   VALUES ('PENDING')
       ,PARTITION sts_closed
   VALUES ('CLOSED')
       ,PARTITION sts_other
   VALUES (DEFAULT)
    )
;


--注释
COMMENT ON TABLE trbtkt.tickets
    IS 'Contains Trouble Ticket transaction data';
COMMENT ON COLUMN trbtkt.tickets.tkt_id
    IS 'Unique identifier for a Trouble Ticket';
COMMENT ON COLUMN trbtkt.tickets.description
    IS 'Trouble Ticket Description';
COMMENT ON COLUMN trbtkt.tickets.submit_dtm
    IS 'Trouble Ticket Submission Time Stamp';
COMMENT ON COLUMN trbtkt.tickets.status
    IS 'Trouble Ticket Status';
COMMENT ON COLUMN trbtkt.tickets.document
    IS 'Large Object (LOB) that contains a Microsoft Word document that provides detailed information about a Trouble Ticket';
COMMENT ON COLUMN trbtkt.tickets.scrnimg
    IS 'Large Object (LOB) that contains a screen print or other image that helps a problem solver identify how to act on a Trouble Ticket';


-- 创建索引和约束
CREATE UNIQUE INDEX trbtkt.tickets_pk_idx
    ON trbtkt.tickets(tkt_id)
    TABLESPACE users;


ALTER TABLE trbtkt.tickets
    ADD CONSTRAINT tickets_pk
    PRIMARY KEY (tkt_id);

--- 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 securefiles
   DISABLE STORAGE IN ROW
   CACHE
        )
   ,LOB(scrnimg)    
        STORE AS SECUREFILE (
   TABLESPACE securefiles
   DISABLE STORAGE IN ROW
   CACHE READS
        )
    PARTITION BY LIST (status) (
        PARTITION sts_open 
   VALUES ('OPEN')
       LOB (document) STORE AS SECUREFILE (KEEP_DUPLICATES NOCOMPRESS)
      ,LOB (scrnimg)  STORE AS SECUREFILE (KEEP_DUPLICATES COMPRESS)
       ,PARTITION sts_pending
   VALUES ('PENDING')
       LOB (document) STORE AS SECUREFILE (KEEP_DUPLICATES NOCOMPRESS)
      ,LOB (scrnimg)  STORE AS SECUREFILE (DEDUPLICATE COMPRESS)
       ,PARTITION sts_closed
   VALUES ('CLOSED')
       LOB (document) STORE AS SECUREFILE (DEDUPLICATE COMPRESS)
      ,LOB (scrnimg)  STORE AS SECUREFILE (DEDUPLICATE COMPRESS HIGH)
       ,PARTITION sts_other
   VALUES (DEFAULT)
       LOB (document) STORE AS SECUREFILE (DEDUPLICATE COMPRESS HIGH)
      ,LOB (scrnimg)  STORE AS SECUREFILE (DEDUPLICATE COMPRESS HIGH)
    )
;


--注释
COMMENT ON TABLE trbtkt.secure_tickets
    IS 'Contains Trouble Ticket transaction data';
COMMENT ON COLUMN trbtkt.secure_tickets.tkt_id
    IS 'Unique identifier for a Trouble Ticket';
COMMENT ON COLUMN trbtkt.secure_tickets.description
    IS 'Trouble Ticket Description';
COMMENT ON COLUMN trbtkt.secure_tickets.submit_dtm
    IS 'Trouble Ticket Submission Time Stamp';
COMMENT ON COLUMN trbtkt.secure_tickets.status
    IS 'Trouble Ticket Status';
COMMENT ON COLUMN trbtkt.secure_tickets.document
    IS 'Large Object (LOB) that contains a Microsoft Word document that provides detailed information about a Trouble Ticket';
COMMENT ON COLUMN trbtkt.secure_tickets.scrnimg
    IS 'Large Object (LOB) that contains a screen print or other image that helps a problem solver identify how to act on a Trouble Ticket';

清单2 使用附加数据重新载入表TRBTKT.TICKETS 

SET SERVEROUTPUT ON
TRUNCATE TABLE trbtkt.tickets;


BEGIN


    trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 101
        ,description => 'Trouble Ticket 101'
        ,submit_dts => '2008-12-31 23:45:00'
        ,status => 'OPEN'
        ,docFileName => 'New_101.doc'
        ,imgFileName => 'DBRIssues.jpg'
    );


    trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 102
        ,description => 'Trouble Ticket 102'
        ,submit_dts => '2009-01-04 00:00:00'
        ,status => 'OPEN'
        ,docFileName => 'New_102.doc'
        ,imgFileName => 'Unresolved.jpg'
    );


    trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 103
        ,description => 'Trouble Ticket 103'
        ,submit_dts => '2009-01-02 00:00:00'
        ,status => 'OPEN'
        ,docFileName => 'New_103.doc'
        ,imgFileName => 'Unresolved.jpg'
     );


    trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 104
        ,description => 'Trouble Ticket 104'
        ,submit_dts => '2009-01-14 12:30:00'
        ,status => 'OPEN'
        ,docFileName => 'New_104.doc'
        ,imgFileName => 'DBRIssues.jpg'
   );


    trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 105
        ,description => 'Trouble Ticket 105'
        ,submit_dts => '2009-01-09 00:00:00'
        ,status => 'OPEN'
        ,docFileName => 'New_105.doc'
        ,imgFileName => 'Unresolved.jpg'
    );


    trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 106
        ,description => 'Trouble Ticket 106'
        ,submit_dts => '2009-01-11 00:00:00'
        ,status => 'OPEN'
        ,docFileName => 'New_106.doc'
        ,imgFileName => 'Unresolved.jpg'
    );
    
    trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 107
        ,description => 'Trouble Ticket 107'
        ,submit_dts => '2009-01-16 00:00:00'
        ,status => 'OPEN'
        ,docFileName => 'New_107.doc'
        ,imgFileName => 'DBRIssues.jpg'
    );
    
    trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 108
        ,description => 'Trouble Ticket 108'
        ,submit_dts => '2009-01-12 00:00:00'
        ,status => 'OPEN'
        ,docFileName => 'New_108.doc'
        ,imgFileName => 'Unresolved.jpg'
    );
    
    trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 109
        ,description => 'Trouble Ticket 109'
        ,submit_dts => '2009-01-02 00:00:00'
        ,status => 'OPEN'
        ,docFileName => 'New_109.doc'
        ,imgFileName => 'Unresolved.jpg'
     );


    trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 110
        ,description => 'Trouble Ticket 110'
        ,submit_dts => '2009-01-14 12:45:00'
        ,status => 'OPEN'
        ,docFileName => 'New_110.doc'
        ,imgFileName => 'DBRIssues.jpg'
   );


    trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 201
        ,description => 'Trouble Ticket 201'
        ,submit_dts => '2008-12-31 23:45:00'
        ,status => 'PENDING'
        ,docFileName => 'New_101.doc'
        ,imgFileName => 'DBRIssues.jpg'
    );


    trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 202
        ,description => 'Trouble Ticket 202'
        ,submit_dts => '2009-01-04 00:00:00'
        ,status => 'OPEN'
        ,docFileName => 'New_102.doc'
        ,imgFileName => 'Unresolved.jpg'
    );


    trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 203
        ,description => 'Trouble Ticket 203'
        ,submit_dts => '2009-01-02 00:00:00'
        ,status => 'CLOSED'
        ,docFileName => 'New_103.doc'
        ,imgFileName => 'Unresolved.jpg'
     );


    trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 204
        ,description => 'Trouble Ticket 204'
        ,submit_dts => '2009-01-14 12:30:00'
        ,status => 'OPEN'
        ,docFileName => 'New_104.doc'
        ,imgFileName => 'DBRIssues.jpg'
   );


    trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 205
        ,description => 'Trouble Ticket 205'
        ,submit_dts => '2009-01-09 00:00:00'
        ,status => 'OPEN'
        ,docFileName => 'New_105.doc'
        ,imgFileName => 'Unresolved.jpg'
    );


    trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 206
        ,description => 'Trouble Ticket 206'
        ,submit_dts => '2009-01-11 00:00:00'
        ,status => 'PENDING'
        ,docFileName => 'New_106.doc'
        ,imgFileName => 'Unresolved.jpg'
    );
    
    trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 207
        ,description => 'Trouble Ticket 207'
        ,submit_dts => '2009-01-16 00:00:00'
        ,status => 'OPEN'
        ,docFileName => 'New_107.doc'
        ,imgFileName => 'DBRIssues.jpg'
    );
    
    trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 208
        ,description => 'Trouble Ticket 208'
        ,submit_dts => '2009-01-12 00:00:00'
        ,status => 'OPEN'
        ,docFileName => 'New_108.doc'
        ,imgFileName => 'Unresolved.jpg'
    );
    
    trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 209
        ,description => 'Trouble Ticket 209'
        ,submit_dts => '2009-01-02 00:00:00'
        ,status => 'PENDING'
        ,docFileName => 'New_109.doc'
        ,imgFileName => 'Unresolved.jpg'
     );


    trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 210
        ,description => 'Trouble Ticket 210'
        ,submit_dts => '2009-01-14 12:45:00'
        ,status => 'OPEN'
        ,docFileName => 'New_110.doc'
        ,imgFileName => 'DBRIssues.jpg'
   );


    trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 301
        ,description => 'Trouble Ticket 301'
        ,submit_dts => '2008-12-31 23:45:00'
        ,status => 'CLOSED'
        ,docFileName => 'New_101.doc'
        ,imgFileName => 'DBRIssues.jpg'
    );


    trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 302
        ,description => 'Trouble Ticket 302'
        ,submit_dts => '2009-01-04 00:00:00'
        ,status => 'OPEN'
        ,docFileName => 'New_102.doc'
        ,imgFileName => 'Unresolved.jpg'
    );


    trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 303
        ,description => 'Trouble Ticket 303'
        ,submit_dts => '2009-01-02 00:00:00'
        ,status => 'OPEN'
        ,docFileName => 'New_103.doc'
        ,imgFileName => 'Unresolved.jpg'
     );


    trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 304
        ,description => 'Trouble Ticket 304'
        ,submit_dts => '2009-01-14 12:30:00'
        ,status => 'CLOSED'
        ,docFileName => 'New_104.doc'
        ,imgFileName => 'DBRIssues.jpg'
   );


    trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 305
        ,description => 'Trouble Ticket 305'
        ,submit_dts => '2009-01-09 00:00:00'
        ,status => 'PENDING'
        ,docFileName => 'New_105.doc'
        ,imgFileName => 'Unresolved.jpg'
    );


    trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 306
        ,description => 'Trouble Ticket 306'
        ,submit_dts => '2009-01-11 00:00:00'
        ,status => 'CLOSED'
        ,docFileName => 'New_106.doc'
        ,imgFileName => 'Unresolved.jpg'
    );
    
    trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 307
        ,description => 'Trouble Ticket 307'
        ,submit_dts => '2009-01-16 00:00:00'
        ,status => 'OPEN'
        ,docFileName => 'New_107.doc'
        ,imgFileName => 'DBRIssues.jpg'
    );
    
    trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 308
        ,description => 'Trouble Ticket 308'
        ,submit_dts => '2009-01-12 00:00:00'
        ,status => 'OPEN'
        ,docFileName => 'New_108.doc'
        ,imgFileName => 'Unresolved.jpg'
    );
    
    trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 309
        ,description => 'Trouble Ticket 309'
        ,submit_dts => '2009-01-02 00:00:00'
        ,status => 'CLOSED'
        ,docFileName => 'New_109.doc'
        ,imgFileName => 'Unresolved.jpg'
     );


    trbtkt.pkg_securefiles.AddTroubleTicket (
tkt_id => 310
        ,description => 'Trouble Ticket 310'
        ,submit_dts => '2009-01-14 12:45:00'
        ,status => 'CLOSED'
        ,docFileName => 'New_110.doc'
        ,imgFileName => 'DBRIssues.jpg'
   );


    COMMIT;
   
END;
/
-- 收集优化器统计信息
BEGIN
    DBMS_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 1000
SET 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_name
  FROM dba_segments
WHERE 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'
SELECT
    table_name
   ,column_name
   ,segment_name
   ,tablespace_name
   ,logging
   ,cache
   ,in_row
   ,encrypt
   ,compression
   ,deduplication
   ,securefile
   ,partitioned
  FROM dba_lobs
WHERE owner = 'TRBTKT'
ORDER BY table_name, column_name
;
TTITLE OFF
--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'
SELECT
    table_name
   ,column_name
   ,def_cache
   ,def_tablespace_name
   ,def_securefile
   ,def_compress
   ,def_deduplicate
   ,def_encrypt
  FROM dba_part_lobs
WHERE table_owner = 'TRBTKT'
ORDER BY table_name, column_name
;
TTITLE OFF
--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?'
SELECT
    table_name
   ,column_name
   ,partition_name
   ,cache
   ,in_row
   ,encrypt
   ,compression
   ,deduplication
   ,securefile
  FROM dba_lob_partitions
WHERE table_owner = 'TRBTKT'
ORDER BY table_name, column_name
;
TTITLE OFF
报告1 从BasicFIle和SecureFile LOB元数据报告返回的结果


SET PAGESIZE 1000
SET 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_name
  FROM dba_segments
WHERE 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'
SELECT
    table_name
   ,column_name
   ,segment_name
   ,tablespace_name
   ,logging
   ,cache
   ,in_row
   ,encrypt
   ,compression
   ,deduplication
   ,securefile
   ,partitioned
  FROM dba_lobs
WHERE owner = 'TRBTKT'
ORDER BY table_name, column_name
;
TTITLE OFF
--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'
SELECT
    table_name
   ,column_name
   ,def_cache
   ,def_tablespace_name
   ,def_securefile
   ,def_compress
   ,def_deduplicate
   ,def_encrypt
  FROM dba_part_lobs
WHERE table_owner = 'TRBTKT'
ORDER BY table_name, column_name
;
TTITLE OFF
--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?'
SELECT
    table_name
   ,column_name
   ,partition_name
   ,cache
   ,in_row
   ,encrypt
   ,compression
   ,deduplication
   ,securefile
  FROM dba_lob_partitions
WHERE table_owner = 'TRBTKT'
ORDER BY table_name, column_name
;
TTITLE OFF
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:
BEGIN
    trbtkt.pkg_securefiles.calc_space_basicfiles (
ownname => 'TRBTKT'
        ,tabname => 'SECURE_TICKETS'
        ,colname => 'DOCUMENT'
        ,partname => 'STS_OPEN'
    );
    trbtkt.pkg_securefiles.calc_space_basicfiles (
ownname => 'TRBTKT'
        ,tabname => 'SECURE_TICKETS'
        ,colname => 'DOCUMENT'
        ,partname => 'STS_PENDING'
    );
    trbtkt.pkg_securefiles.calc_space_basicfiles (
ownname => 'TRBTKT'
        ,tabname => 'SECURE_TICKETS'
        ,colname => 'DOCUMENT'
        ,partname => 'STS_CLOSED'
    );
    trbtkt.pkg_securefiles.calc_space_basicfiles (
ownname => 'TRBTKT'
        ,tabname => 'SECURE_TICKETS'
        ,colname => 'DOCUMENT'
        ,partname => 'STS_OTHER'
    );
    trbtkt.pkg_securefiles.calc_space_basicfiles (
ownname => 'TRBTKT'
        ,tabname => 'SECURE_TICKETS'
        ,colname => 'SCRNIMG'
        ,partname => 'STS_OPEN'
    );
    trbtkt.pkg_securefiles.calc_space_basicfiles (
ownname => 'TRBTKT'
        ,tabname => 'SECURE_TICKETS'
        ,colname => 'SCRNIMG'
        ,partname => 'STS_PENDING'
    );
    trbtkt.pkg_securefiles.calc_space_basicfiles (
ownname => 'TRBTKT'
        ,tabname => 'SECURE_TICKETS'
        ,colname => 'SCRNIMG'
        ,partname => 'STS_CLOSED'
    );
    trbtkt.pkg_securefiles.calc_space_basicfiles (
ownname => 'TRBTKT'
        ,tabname => 'SECURE_TICKETS'
        ,colname => 'SCRNIMG'
        ,partname => 'STS_OTHER'
    );
END;
/
============================================================
Space Usage for BasicFile LOB TRBTKT.SECURE_TICKETS.DOCUMENT
Partition Name: STS_OPEN
------------------------------------------------------------
Full Blocks: 123 KB: .96
Unformatted Blocks: 379 KB: 2.96 
Total Blocks: 123 Total KB: .96  
============================================================
============================================================
Space Usage for BasicFile LOB TRBTKT.SECURE_TICKETS.DOCUMENT
Partition Name: STS_PENDING      
------------------------------------------------------------
Full Blocks: 20 KB: .16 
Unformatted Blocks: 482 KB: 3.77 
Total Blocks: 20 Total KB: .16   
============================================================
============================================================
Space Usage for BasicFile LOB TRBTKT.SECURE_TICKETS.DOCUMENT
Partition Name: STS_CLOSED       
------------------------------------------------------------
Full Blocks: 37 KB: .29 
Unformatted Blocks: 465 KB: 3.63 
Total Blocks: 37 Total KB: .29   
============================================================
============================================================
Space Usage for BasicFile LOB TRBTKT.SECURE_TICKETS.DOCUMENT
Partition Name: STS_OTHER        
------------------------------------------------------------
Full Blocks: 0 KB: 0    
Unformatted Blocks: 0 KB: 0      
Total Blocks: 0 Total KB: 0      
============================================================
============================================================
Space Usage for BasicFile LOB TRBTKT.SECURE_TICKETS.SCRNIMG 
Partition Name: STS_OPEN
------------------------------------------------------------
Full Blocks: 420 KB: 3.28        
Unformatted Blocks: 82 KB: .64   
Total Blocks: 420 Total KB: 3.28 
============================================================
============================================================
Space Usage for BasicFile LOB TRBTKT.SECURE_TICKETS.SCRNIMG 
Partition Name: STS_PENDING      
------------------------------------------------------------
Full Blocks: 66 KB: .52 
Unformatted Blocks: 436 KB: 3.41 
Total Blocks: 66 Total KB: .52   
============================================================
============================================================
Space Usage for BasicFile LOB TRBTKT.SECURE_TICKETS.SCRNIMG 
Partition Name: STS_CLOSED       
------------------------------------------------------------
Full Blocks: 144 KB: 1.13        
Unformatted Blocks: 358 KB: 2.8  
Total Blocks: 144 Total KB: 1.13 
============================================================
============================================================
Space Usage for BasicFile LOB TRBTKT.SECURE_TICKETS.SCRNIMG 
Partition Name: STS_OTHER        
------------------------------------------------------------
Full Blocks: 0 KB: 0    
Unformatted Blocks: 0 KB: 0      
Total Blocks: 0 Total KB: 0      
============================================================
-- SecureFile存储利用率:
BEGIN
    trbtkt.pkg_securefiles.calc_space_securefiles (
ownname => 'TRBTKT'
        ,tabname => 'TICKETS'
        ,colname => 'DOCUMENT'
        ,partname => 'STS_OPEN'
    );
    trbtkt.pkg_securefiles.calc_space_securefiles (
ownname => 'TRBTKT'
        ,tabname => 'TICKETS'
        ,colname => 'DOCUMENT'
        ,partname => 'STS_PENDING'
    );
    trbtkt.pkg_securefiles.calc_space_securefiles (
ownname => 'TRBTKT'
        ,tabname => 'TICKETS'
        ,colname => 'DOCUMENT'
        ,partname => 'STS_CLOSED'
    );
    trbtkt.pkg_securefiles.calc_space_securefiles (
ownname => 'TRBTKT'
        ,tabname => 'TICKETS'
        ,colname => 'DOCUMENT'
        ,partname => 'STS_OTHER'
    );
    trbtkt.pkg_securefiles.calc_space_securefiles (
ownname => 'TRBTKT'
        ,tabname => 'TICKETS'
        ,colname => 'SCRNIMG'
        ,partname => 'STS_OPEN'
    );
    trbtkt.pkg_securefiles.calc_space_securefiles (
ownname => 'TRBTKT'
        ,tabname => 'TICKETS'
        ,colname => 'SCRNIMG'
        ,partname => 'STS_PENDING'
    );
    trbtkt.pkg_securefiles.calc_space_securefiles (
ownname => 'TRBTKT'
        ,tabname => 'TICKETS'
        ,colname => 'SCRNIMG'
        ,partname => 'STS_CLOSED'
    );
    trbtkt.pkg_securefiles.calc_space_securefiles (
ownname => 'TRBTKT'
        ,tabname => 'TICKETS'
        ,colname => 'SCRNIMG'
        ,partname => 'STS_OTHER'
    );
END;
/


============================================================
Space Usage for SecureFile LOB TRBTKT.TICKETS.DOCUMENT      
Partition Name: STS_OPEN
------------------------------------------------------------
Segment Blocks: 1024 KB: 8192    
Used Blocks: 124 KB: 992
Expired Blocks: 882 KB: 7056     
Unexpired Blocks: 0 KB: 0        
============================================================
============================================================
Space Usage for SecureFile LOB TRBTKT.TICKETS.DOCUMENT      
Partition Name: STS_PENDING      
------------------------------------------------------------
Segment Blocks: 1024 KB: 8192    
Used Blocks: 21 KB: 168 
Expired Blocks: 985 KB: 7880     
Unexpired Blocks: 0 KB: 0        
============================================================
============================================================
Space Usage for SecureFile LOB TRBTKT.TICKETS.DOCUMENT      
Partition Name: STS_CLOSED       
------------------------------------------------------------
Segment Blocks: 1024 KB: 8192    
Used Blocks: 13 KB: 104 
Expired Blocks: 993 KB: 7944     
Unexpired Blocks: 0 KB: 0        
============================================================
============================================================
Space Usage for SecureFile LOB TRBTKT.TICKETS.DOCUMENT      
Partition Name: STS_OTHER        
------------------------------------------------------------
Segment Blocks: 512 KB: 4096     
Used Blocks: 501 KB: 4008        
Expired Blocks: 0 KB: 0 
Unexpired Blocks: 0 KB: 0        
============================================================
============================================================
Space Usage for SecureFile LOB TRBTKT.TICKETS.SCRNIMG       
Partition Name: STS_OPEN
------------------------------------------------------------
Segment Blocks: 2560 KB: 20480   
Used Blocks: 405 KB: 3240        
Expired Blocks: 2134 KB: 17072   
Unexpired Blocks: 0 KB: 0        
============================================================
============================================================
Space Usage for SecureFile LOB TRBTKT.TICKETS.SCRNIMG       
Partition Name: STS_PENDING      
------------------------------------------------------------
Segment Blocks: 1024 KB: 8192    
Used Blocks: 62 KB: 496 
Expired Blocks: 944 KB: 7552     
Unexpired Blocks: 0 KB: 0        
============================================================
============================================================
Space Usage for SecureFile LOB TRBTKT.TICKETS.SCRNIMG       
Partition Name: STS_CLOSED       
------------------------------------------------------------
Segment Blocks: 1024 KB: 8192    
Used Blocks: 142 KB: 1136        
Expired Blocks: 864 KB: 6912     
Unexpired Blocks: 0 KB: 0        
============================================================
============================================================
Space Usage for SecureFile LOB TRBTKT.TICKETS.SCRNIMG       
Partition Name: STS_OTHER        
------------------------------------------------------------
Segment Blocks: 512 KB: 4096     
Used Blocks: 501 KB: 4008        
Expired Blocks: 0 KB: 0 
Unexpired Blocks: 0 KB: 0        
============================================================

SET SERVEROUTPUT ON修改SecureFile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.TICKETS
SQL>     MODIFY LOB(DOCUMENT) (NOCOMPRESS);


Table altered.



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


Table altered.


SQL> ALTER TABLE TRBTKT.TICKETS
SQL>     MODIFY PARTITION STS_PENDING LOB(SCRNIMG) (COMPRESS HIGH);
       
Table altered.
       
SQL> ALTER TABLE TRBTKT.TICKETS
SQL>     MODIFY PARTITION STS_PENDING LOB(DOCUMENT) (DEDUPLICATE);
       
Table altered.
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       NO
SECURE_TICKETS   DOCUMENT     STS_CLOSED   NOYES        NONE       NONE       NONE       NO
SECURE_TICKETS   DOCUMENT     STS_OPEN     NOYES        NONE       NONE       NONE       NO
SECURE_TICKETS   DOCUMENT     STS_PENDING  NOYES        NONE       NONE       NONE       NO
SECURE_TICKETS   SCRNIMG      STS_OTHER    NOYES        NONE       NONE       NONE       NO
SECURE_TICKETS   SCRNIMG      STS_CLOSED   NOYES        NONE       NONE       NONE       NO
SECURE_TICKETS   SCRNIMG      STS_PENDING  NOYES        NONE       NONE       NONE       NO
SECURE_TICKETS   SCRNIMG      STS_OPEN     NOYES        NONE       NONE       NONE       NO
TICKETS DOCUMENT     STS_OTHER    YES        NONONOLOB        YES
TICKETS DOCUMENT     STS_PENDING  YES        NONONOLOB        YES
TICKETS DOCUMENT     STS_CLOSED   YES        NONONOLOB        YES
TICKETS DOCUMENT     STS_OPEN     YES        NONONONOYES
TICKETS SCRNIMG      STS_PENDING  CACHEREADS NONOHIGH       NOYES
TICKETS SCRNIMG      STS_OPEN     CACHEREADS NONOMEDIUM     NOYES
TICKETS SCRNIMG      STS_CLOSED   CACHEREADS NONOHIGH       NOYES
TICKETS SCRNIMG      STS_OTHER    CACHEREADS NONOHIGH       NOYES

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。

【编辑推荐】

  1. Oracle数据库开发经验浅谈
  2. Oracle存储过程开发实例
  3. Oracle数据库设计提升性能的五条法则

【责任编辑：彭凡 TEL：（010）68476606】

责任编辑：彭凡 来源： ITPUB
OracleBasicFileSecureFile
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本文会介绍作者在迁移数据库的过程中遇到的一些问题，并为各位读者提供需要停机迁移数据库的可行方案，如果需要不停机迁移数据库还是需要别的方案来解决，在这里提供的方案用于百万数据量的MongoDB，预计的停机时间在两小时左右，如果数据量在千万级别以上，过长的停机时间可能是无法接受的，应该设计不停机的迁移方案。

2017-10-20 08:45:15

数据库MongoDBMySQL
实战：从Unix迁移到Linux
从Unix向Linux迁移所要做的第一个步骤就是准备好一个测试环境。你的团队可能缺乏Linux的相关经验，有一个测试环境用来学习是非常必要的（不用担心误操作破坏任何东西）。

2012-05-21 10:23:36

从MySQL迁移到MariaDB(CentOS)
MariaDB是一个采用Maria存储引擎的MySQL分支版本，是由原来MySQL的作者MichaelWidenius创办的公司开发的免费开源的数据库服务器。RedHat企业发行版RHEL7将用MariaDB替代MySQL，一旦RHEL完成切换，基于RHEL的社区版CentOS将会紧跟着作出改变。所以呢，使用CentOS系统的这个VPS或迟或早都是要切换到MariaDB的，大势所趋啊。

2013-06-21 13:49:08

MariaDB
如何从复杂单体应用快速迁移到微服务？
想必你已知道了微服务及其工作原理，现在是时候探讨如向微服务转变这个关键话题了。

2019-01-07 08:10:54

微服务单体 Web
一篇学会如何从Webpack迁移到Vite
如果你迁移的是一个较小或中等规模的项目，Vite确实能提供一些便利。无论是服务器启动还是热模块替换，它的速度都能显著提高开发效率。其配置的简洁性也是一个受欢迎的优势，而且它在设计时考虑到了原生ES模块和现代框架的兼容性，这为它的未来发展奠定了良好的基础。

2023-12-07 07:14:36

WebpackVite
OpenJDK 项目从 Mercurial 迁移到 GitHub
OpenJDK项目正从Mercurial迁移到GitHub，切换到Git源代码控制系统，预计迁移将在2020年9月完成。

2020-07-27 11:35:26

GitHub代码开发者
我们从 UmiJS 迁移到了 Vite
我们从UmiJS迁移到Vite已经上线半年多了。目前很多人对Vite跃跃欲试，Vite开发体验到底怎么样，今天来叙叙迁移到Vite的亲身经历。

2021-11-29 09:44:03

UmiJSVite前端
从 Windows 迁移到 Ubuntu 终极指南
在本教程中，我将引导您完成在UbuntuServer22.04上安装Caddy的步骤，以及如何创建一个简单的静态站点。

2022-06-06 07:24:09

Caddy开源Ubuntu
从Unix迁移到Linux是否可行？
从高端Unix系统迁移到x86Linux平台似乎成为一种很流行的观点，至少在理论上非常流行,但事实证明并非每个人都认为完全依靠Linux是最好的解决办法.

2009-02-06 10:32:00

UnixLinux服务器
Twitter从Rails迁移到了Java
本文是从TwittermovesfromRailstoJava这篇文章翻译而来。

2011-04-25 09:35:31

TwitterJava
Linux下从MySQL迁移到MariaDB
ArchLinux昨天宣布将使用MariaDB作为MySQL的默认提供包，openSUSE已经在新近发布的12.3版中默认使用MariaDB,连Fedora也正在考虑更换为MariaDB.

2013-05-03 09:49:38

MySQLMariaDB
你应该从SVN迁移到Git吗？
最近整个技术社区都在讨论Git。很多人都推崇Git，说它是多么多么的牛逼，如果你还不从SVN或者CVS迁移到就会被淘汰云云。我并不同意这个观点。我承认Git的设计比SVN要好，但是真的好到让你马上不顾一切的迁移所有的SVN代码库到Git吗？我看来看去，Git真的比SVN强的地方就两点。

2012-02-24 09:34:48

SVNGit
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