EXPDP:使用ESTIMATE_ONLY参数评估ESTIMATE性能
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在使用Expdp进行导出时,Expdp需要计算导出数据大小容量,Oracle可以通过两种方式进行容量估算,一种是通过数据块数量、一种是通过统计信息中记录的内容估算。两者在不同版本中,可能有巨大的性能差异,尤其是在Oracle 10g的早期版本中,一些Bug严重影响了性能。
我们可以通过expdp的参数ESTIMATE_ONLY和ESTIMATE来评估导出的性能,ESTIMATE_ONLY仅作评估不会导出数据,通过ESTIMATE参数指定statistics和blocks参数来测试两者的差异。
以下是Oracle 10.2.0.5中的测试数据输出,在这一版本中,并无明显的性能差异,评估时间在5~6秒左右.
测试主要的两条命令如下:
expdp \\\'/ as sysdba\\\' ESTIMATE_ONLY=y schemas=EYGLE ESTIMATE=statistics
expdp \\\'/ as sysdba\\\' ESTIMATE_ONLY=y schemas=EYGLE ESTIMATE=blocks
测试数出如下:
[oracle@oracle ~]$ expdp \\\'/ as sysdba\\\' ESTIMATE_ONLY=y schemas=EYGLE ESTIMATE=statistics
Export: Release 10.2.0.5.0 - 64bit Production on Wednesday, 29 December, 2010 12:29:14
Copyright (c) 2003, 2007, Oracle. All rights reserved.
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
With the Partitioning, Real Application Clusters, Data Mining and Real Application Testing options
Starting "SYS"."SYS_EXPORT_SCHEMA_01": "/******** AS SYSDBA" ESTIMATE_ONLY=y schemas=EYGLE ESTIMATE=statistics
Estimate in progress using STATISTICS method...
Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
. estimated "EYGLE"."EYGLEE_ISMG_CURRENT" 3.504 GB
. estimated "EYGLE"."EYGLEE_ISMG":"M07" 1.702 GB
. estimated "EYGLE"."EYGLEE_ISMG":"M06" 1.491 GB
. estimated "EYGLE"."EYGLEE_ISMG":"M03" 1.377 GB
. estimated "EYGLE"."EYGLEE_ISMG":"M05" 1.306 GB
. estimated "EYGLE"."EYGLEE_ISMG":"M12" 1.296 GB
. estimated "EYGLE"."EYGLEE_ISMG":"M08" 1.292 GB
. estimated "EYGLE"."EYGLEE_ISMG":"M04" 1.290 GB
. estimated "EYGLE"."EYGLEE_ISMG":"M01" 1.200 GB
. estimated "EYGLE"."EYGLEE_ISMG":"M02" 1.187 GB
. estimated "EYGLE"."EYGLEE_ISMG":"M11" 1.147 GB
. estimated "EYGLE"."EYGLEE_ISMG":"M09" 1.132 GB
. estimated "EYGLE"."EYGLEE_ISMG":"M10" 1.086 GB
. estimated "EYGLE"."MONTH_BILLS" 162.1 MB
. estimated "EYGLE"."EYGLEE_ISMG2":"M07" 158.9 MB
. estimated "EYGLE"."SMS_FROM_ISMG":"M09" 138.6 MB
. estimated "EYGLE"."SMS_FROM_ISMG":"M10" 92.45 MB
. estimated "EYGLE"."SMS_FROM_ISMG":"M12" 88.28 MB
. estimated "EYGLE"."SMS_FROM_ISMG":"M01" 87.56 MB
. estimated "EYGLE"."SMS_FROM_ISMG":"M03" 83.47 MB
. estimated "EYGLE"."SMS_FROM_ISMG":"M11" 83.26 MB
. estimated "EYGLE"."SMS_FROM_ISMG":"M02" 83.14 MB
. estimated "EYGLE"."SMS_FROM_ISMG":"M08" 77.55 MB
. estimated "EYGLE"."SMS_FROM_ISMG":"M04" 75.46 MB
. estimated "EYGLE"."SMS_FROM_ISMG":"M07" 72.32 MB
. estimated "EYGLE"."SMS_FROM_ISMG":"M06" 71.94 MB
. estimated "EYGLE"."SMS_FROM_ISMG":"M05" 67.50 MB
. estimated "EYGLE"."EYGLEE_ISMG2":"M06" 26.27 MB
. estimated "EYGLE"."SERVICE_USERS" 15.97 MB
. estimated "EYGLE"."BLACK_MDNS" 11.19 MB
. estimated "EYGLE"."SERVICE_USER_ACTIONS" 10.13 MB
. estimated "EYGLE"."MDNSEGMENTS" 1.766 MB
. estimated "EYGLE"."MDNNEW" 1.384 MB
. estimated "EYGLE"."MDNSEGINFO" 1.075 MB
. estimated "EYGLE"."THREE_PHASE_BILLS" 1019. KB
. estimated "EYGLE"."BILL_BLOCK_MDNS" 202.5 KB
. estimated "EYGLE"."TMPSX" 34.12 KB
. estimated "EYGLE"."TMPGX" 21.30 KB
. estimated "EYGLE"."SERVICES" 19.17 KB
. estimated "EYGLE"."QTTMP" 12.57 KB
. estimated "EYGLE"."SERVICE_PROVIDERS" 9.048 KB
. estimated "EYGLE"."ISMG_PROFILES" 8.504 KB
. estimated "EYGLE"."ADMIN_USERS" 0 KB
. estimated "EYGLE"."ALLOWED_IPS" 0 KB
. estimated "EYGLE"."BILL_BLOCK_MDN_SEGMENTS" 0 KB
. estimated "EYGLE"."REPORT_FROM_ISMG" 0 KB
. estimated "EYGLE"."SMS_FROM_ISMG":"M13" 0 KB
. estimated "EYGLE"."SMS_FROM_SERVICE" 0 KB
. estimated "EYGLE"."EYGLEE_ISMG":"M13" 0 KB
. estimated "EYGLE"."EYGLEE_ISMG2":"M01" 0 KB
. estimated "EYGLE"."EYGLEE_ISMG2":"M02" 0 KB
. estimated "EYGLE"."EYGLEE_ISMG2":"M03" 0 KB
. estimated "EYGLE"."EYGLEE_ISMG2":"M04" 0 KB
. estimated "EYGLE"."EYGLEE_ISMG2":"M05" 0 KB
. estimated "EYGLE"."EYGLEE_ISMG2":"M08" 0 KB
. estimated "EYGLE"."EYGLEE_ISMG2":"M09" 0 KB
. estimated "EYGLE"."EYGLEE_ISMG2":"M10" 0 KB
. estimated "EYGLE"."EYGLEE_ISMG2":"M11" 0 KB
. estimated "EYGLE"."EYGLEE_ISMG2":"M12" 0 KB
. estimated "EYGLE"."EYGLEE_ISMG2":"M13" 0 KB
Total estimation using STATISTICS method: 20.39 GB
Job "SYS"."SYS_EXPORT_SCHEMA_01" successfully completed at 12:29:19
[oracle@oracle ~]$ expdp \\\'/ as sysdba\\\' ESTIMATE_ONLY=y schemas=EYGLE ESTIMATE=blocks
Export: Release 10.2.0.5.0 - 64bit Production on Wednesday, 29 December, 2010 12:29:29
Copyright (c) 2003, 2007, Oracle. All rights reserved.
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
With the Partitioning, Real Application Clusters, Data Mining and Real Application Testing options
Starting "SYS"."SYS_EXPORT_SCHEMA_01": "/******** AS SYSDBA" ESTIMATE_ONLY=y schemas=EYGLE ESTIMATE=blocks
Estimate in progress using BLOCKS method...
Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
. estimated "EYGLE"."EYGLEE_ISMG_CURRENT" 4.187 GB
. estimated "EYGLE"."EYGLEE_ISMG":"M07" 2 GB
. estimated "EYGLE"."EYGLEE_ISMG":"M06" 1.75 GB
. estimated "EYGLE"."EYGLEE_ISMG":"M03" 1.625 GB
. estimated "EYGLE"."EYGLEE_ISMG":"M04" 1.562 GB
. estimated "EYGLE"."EYGLEE_ISMG":"M05" 1.562 GB
. estimated "EYGLE"."EYGLEE_ISMG":"M08" 1.562 GB
. estimated "EYGLE"."EYGLEE_ISMG":"M12" 1.5 GB
. estimated "EYGLE"."EYGLEE_ISMG":"M02" 1.437 GB
. estimated "EYGLE"."EYGLEE_ISMG":"M01" 1.375 GB
. estimated "EYGLE"."EYGLEE_ISMG":"M09" 1.375 GB
. estimated "EYGLE"."EYGLEE_ISMG":"M10" 1.312 GB
. estimated "EYGLE"."EYGLEE_ISMG":"M11" 1.312 GB
. estimated "EYGLE"."MONTH_BILLS" 232 MB
. estimated "EYGLE"."SMS_FROM_ISMG":"M09" 168 MB
. estimated "EYGLE"."SMS_FROM_ISMG":"M12" 168 MB
. estimated "EYGLE"."EYGLEE_ISMG2":"M07" 168 MB
. estimated "EYGLE"."SMS_FROM_ISMG":"M01" 112 MB
. estimated "EYGLE"."SMS_FROM_ISMG":"M10" 112 MB
. estimated "EYGLE"."SMS_FROM_ISMG":"M02" 104 MB
. estimated "EYGLE"."SMS_FROM_ISMG":"M03" 104 MB
. estimated "EYGLE"."SMS_FROM_ISMG":"M11" 104 MB
. estimated "EYGLE"."SMS_FROM_ISMG":"M08" 96 MB
. estimated "EYGLE"."SMS_FROM_ISMG":"M04" 88 MB
. estimated "EYGLE"."SMS_FROM_ISMG":"M06" 88 MB
. estimated "EYGLE"."SMS_FROM_ISMG":"M07" 88 MB
. estimated "EYGLE"."SMS_FROM_ISMG":"M05" 80 MB
. estimated "EYGLE"."EYGLEE_ISMG2":"M06" 28 MB
. estimated "EYGLE"."SERVICE_USERS" 26 MB
. estimated "EYGLE"."BLACK_MDNS" 22 MB
. estimated "EYGLE"."SERVICE_USER_ACTIONS" 14 MB
. estimated "EYGLE"."MDNSEGMENTS" 3 MB
. estimated "EYGLE"."QTTMP" 3 MB
. estimated "EYGLE"."THREE_PHASE_BILLS" 3 MB
. estimated "EYGLE"."MDNNEW" 2 MB
. estimated "EYGLE"."MDNSEGINFO" 2 MB
. estimated "EYGLE"."BILL_BLOCK_MDNS" 384 KB
. estimated "EYGLE"."ISMG_PROFILES" 128 KB
. estimated "EYGLE"."SERVICES" 128 KB
. estimated "EYGLE"."SERVICE_PROVIDERS" 128 KB
. estimated "EYGLE"."TMPGX" 128 KB
. estimated "EYGLE"."TMPSX" 128 KB
. estimated "EYGLE"."ADMIN_USERS" 0 KB
. estimated "EYGLE"."ALLOWED_IPS" 0 KB
. estimated "EYGLE"."BILL_BLOCK_MDN_SEGMENTS" 0 KB
. estimated "EYGLE"."REPORT_FROM_ISMG" 0 KB
. estimated "EYGLE"."SMS_FROM_ISMG":"M13" 0 KB
. estimated "EYGLE"."SMS_FROM_SERVICE" 0 KB
. estimated "EYGLE"."EYGLEE_ISMG":"M13" 0 KB
. estimated "EYGLE"."EYGLEE_ISMG2":"M01" 0 KB
. estimated "EYGLE"."EYGLEE_ISMG2":"M02" 0 KB
. estimated "EYGLE"."EYGLEE_ISMG2":"M03" 0 KB
. estimated "EYGLE"."EYGLEE_ISMG2":"M04" 0 KB
. estimated "EYGLE"."EYGLEE_ISMG2":"M05" 0 KB
. estimated "EYGLE"."EYGLEE_ISMG2":"M08" 0 KB
. estimated "EYGLE"."EYGLEE_ISMG2":"M09" 0 KB
. estimated "EYGLE"."EYGLEE_ISMG2":"M10" 0 KB
. estimated "EYGLE"."EYGLEE_ISMG2":"M11" 0 KB
. estimated "EYGLE"."EYGLEE_ISMG2":"M12" 0 KB
. estimated "EYGLE"."EYGLEE_ISMG2":"M13" 0 KB
Total estimation using BLOCKS method: 24.33 GB
Job "SYS"."SYS_EXPORT_SCHEMA_01" successfully completed at 12:29:35
测试数据,仅供参考!
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文章信息
- 作者:eygle@eygle.com(eygle) 来源: Oracle Life
- 标签: ESTIMATE ESTIMATE_ONLY EXPDP
- 发布时间:2010-12-29 21:42:21
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