Oracle中如何从BasicFile迁移到SecureFile

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
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