Oracle impdp通過network_link不落地方式匯入資料

由於磁碟空間的客觀原因，不能採用rman和expdp方式產生落地檔案進行恢複或匯入操作，所以最終還是決定採用impdp採用network_link方式進行資料匯入，這個方式真的非常不錯，並且由於impdp可以直接在伺服器端後台運行，所以可以無人值守，第二天只需要檢查logfile即可

此處略去建立dblink這個步驟。

Oracle$ impdp system/oracle network_link=expdp logfile=impdpXZBLOB20120331.log directory=expdp schemas=XZBLOB parallel=8

Import: Release 10.2.0.5.0 - 64bit Production on 星期六, 31 3月, 2012 16:26:55

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 "SYSTEM"."SYS_IMPORT_SCHEMA_02":  system/******** network_link=expdp logfile=impdpXZBLOB20120331.log directory=expdp schemas=XZBLOB parallel=8
Estimate in progress using BLOCKS method...
Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 232.3 GB
Processing object type SCHEMA_EXPORT/USER
Processing object type SCHEMA_EXPORT/SYSTEM_GRANT
Processing object type SCHEMA_EXPORT/ROLE_GRANT
Processing object type SCHEMA_EXPORT/DEFAULT_ROLE
Processing object type SCHEMA_EXPORT/PRE_SCHEMA/PROCACT_SCHEMA
Processing object type SCHEMA_EXPORT/TABLE/TABLE
. . imported "XZBLOB"."ACF_SYS_BULEX_ACFFILE"              1477 rows
. . imported "XZBLOB"."AQSIQ_WS_FILE"                      1235 rows
. . imported "XZBLOB"."ACF_SYS_OPINION_ATTACH"             1844 rows
. . imported "XZBLOB"."BJYC_ISO_ATTACH"                     269 rows
. . imported "XZBLOB"."YKT_FILE"                            138 rows
. . imported "XZBLOB"."ISO_IMAGE_FILE"                      577 rows
. . imported "XZBLOB"."AQSIQ_HUIYI_FILE"                    364 rows
. . imported "XZBLOB"."XZXK_ATTACH_FILE"                     14 rows
. . imported "XZBLOB"."XZ_BG_XX_XXATTACH"                    13 rows
. . imported "XZBLOB"."ISO_GRAPH_FILE"                      544 rows
. . imported "XZBLOB"."MAMMOTH_FS_ACFFILE"                   10 rows
. . imported "XZBLOB"."ISO_CELL_FILE"                       544 rows
. . imported "XZBLOB"."ITSS_HYGL"                             3 rows
. . imported "XZBLOB"."MAMMOTH_PM_ACFFILE"                    4 rows
. . imported "XZBLOB"."ACF_SYS_USER_SIGN_PIC_FILE"            3 rows
. . imported "XZBLOB"."ISO_FILE"                           5133 rows
. . imported "XZBLOB"."ACF_SYS_TEMP_FILE"                 17174 rows
. . imported "XZBLOB"."ACF_APP_BOARDFILE_UPLOADED"        19434 rows
. . imported "XZBLOB"."ACF_SYS_GWATTACH"                  74986 rows
. . imported "XZBLOB"."ACF_FWGL_ZWHISTORY"               294319 rows
. . imported "XZBLOB"."ACF_SYS_SWATTACH"                 180418 rows
. . imported "XZBLOB"."ARCHIVE_ATTACHMENT"               224383 rows
. . imported "XZBLOB"."ACF_APP_BAATTACH"                      0 rows
. . imported "XZBLOB"."ACF_APP_BOARD"                         0 rows
. . imported "XZBLOB"."ACF_APP_DZWDATTACH"                    0 rows
. . imported "XZBLOB"."ACF_APP_FILE_UPLOADED"                 0 rows
. . imported "XZBLOB"."ACF_APP_HELPER_UPLOADED"               0 rows
. . imported "XZBLOB"."ACF_APP_HQGDZCATTACH"                  0 rows
. . imported "XZBLOB"."ACF_APP_HQGDZCIMGATTACH"               0 rows
. . imported "XZBLOB"."ACF_APP_QBATTACH"                      0 rows
. . imported "XZBLOB"."ACF_APP_WORKFILE_UPLOADED"             0 rows
. . imported "XZBLOB"."ACF_APP_XFATTACH"                      0 rows
. . imported "XZBLOB"."ACF_SYS_DE_ENTITY"                     0 rows
. . imported "XZBLOB"."ACF_SYS_REPORT_ATTACH"                 0 rows
. . imported "XZBLOB"."EXCHANGE_EDI_RECEIVE"                  0 rows
. . imported "XZBLOB"."EXCHANGE_EDI_SEND"                     0 rows
. . imported "XZBLOB"."WAISHI_FILE"                           0 rows
. . imported "XZBLOB"."XZ_BG_LDJC_ATTACH"                     0 rows
. . imported "XZBLOB"."XZ_FGZD_DOC"                           0 rows
. . imported "XZBLOB"."XZ_HQ_JJ_FILE"                         0 rows
. . imported "XZBLOB"."XZ_RS_DOC"                             0 rows
. . imported "XZBLOB"."XZ_RS_XML"                             0 rows
Processing object type SCHEMA_EXPORT/TABLE/INDEX/INDEX
Processing object type SCHEMA_EXPORT/TABLE/CONSTRAINT/CONSTRAINT
Processing object type SCHEMA_EXPORT/TABLE/INDEX/STATISTICS/INDEX_STATISTICS
Processing object type SCHEMA_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
Job "SYSTEM"."SYS_IMPORT_SCHEMA_02" successfully completed at 23:38:4

如上大約7個小時12分鐘匯入232.3GB資料，速度雖然比較慢，但是好歹夜間也不用值守，但是有一點需要注意，network是不支援long欄位的遷移的，所以需要單獨對long欄位的表進行遷移，目前使用者由於不存在long欄位的表，所以沒有報錯，其中是有使用者存在long欄位的，由於資料量小，後來直接通過schema方式對該使用者單獨expdp/impdp操作，總體來說，對於沒有足夠的中轉空間，並且能夠容忍資料丟失的應用場合還是相當不錯的選擇。

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