Thuật toán mặc định là BASIC .
COMPRESSION_ALGORITHM = [BASIC | LOW | MEDIUM | HIGH]
BASIC: Thuật toán này là sự kết hợp tốt giữa tỷ lệ nén và tốc độ.
LOW:- Thuật toán này phù hợp với môi trường mà tài nguyên CPU bị hạn chế và có ít tác động đến thông lượng xuất khẩu.
MEDIUM:- Đây là mức độ được khuyến nghị cho hầu hết các môi trường. Giống như BASIC, thuật toán này cũng cung cấp sự kết hợp tốt giữa tỷ lệ nén và tốc độ, nhưng nó sử dụng thuật toán khác với BASIC .
HIGH:- Thuật toán này phù hợp nhất với môi trường có tốc độ mạng là yếu tố hạn chế.
Hãy xem các ví dụ bên dưới với từng thuật toán.
Tôi đã tạo một bảng EMP trong lược đồ TEST.
SQL> select sum(bytes/1024) SIZE_KB from dba_segments where segment_name='EMP' and owner='TEST';
SIZE_KB
----------
64
#First take the export backup of the table without compression and see he size of the dump file.
C:\Windows\System32>expdp directory=DIR_TEST tables=test.emp dumpfile=table.dmp logfile=table.log
Export: Release 19.0.0.0.0 - Production on Wed Apr 17 15:43:11 2024
Version 19.16.0.0.0
Copyright (c) 1982, 2022, Oracle and/or its affiliates. All rights reserved.
Username: / as sysdba
Connected to: Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Starting "SYS"."SYS_EXPORT_TABLE_01": /******** AS SYSDBA directory=DIR_TEST tables=test.emp dumpfile=table.dmp logfile=table.log
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
Processing object type TABLE_EXPORT/TABLE/INDEX/STATISTICS/INDEX_STATISTICS
Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
Processing object type TABLE_EXPORT/TABLE/STATISTICS/MARKER
Processing object type TABLE_EXPORT/TABLE/TABLE
Processing object type TABLE_EXPORT/TABLE/CONSTRAINT/CONSTRAINT
. . exported "TEST"."EMP" 6.531 KB 5 rows
Master table "SYS"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded
******************************************************************************
Dump file set for SYS.SYS_EXPORT_TABLE_01 is:
C:\BACKUP\TABLE.DMP
Job "SYS"."SYS_EXPORT_TABLE_01" successfully completed at Wed Apr 17 15:43:26 2024 elapsed 0 00:00:13
#Export the table without compression algorithm, but with COMPRESSION=DATA_ONLY and see he size of the dump file.
C:\Windows\System32>expdp directory=DIR_TEST tables=test.emp dumpfile=table.dmp logfile=table.log COMPRESSION=DATA_ONLY
Export: Release 19.0.0.0.0 - Production on Wed Apr 17 15:41:32 2024
Version 19.16.0.0.0
Copyright (c) 1982, 2022, Oracle and/or its affiliates. All rights reserved.
Username: / as sysdba
Connected to: Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Starting "SYS"."SYS_EXPORT_TABLE_01": /******** AS SYSDBA directory=DIR_TEST tables=test.emp dumpfile=table.dmp logfile=table.log COMPRESSION=DATA_ONLY
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
Processing object type TABLE_EXPORT/TABLE/INDEX/STATISTICS/INDEX_STATISTICS
Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
Processing object type TABLE_EXPORT/TABLE/STATISTICS/MARKER
Processing object type TABLE_EXPORT/TABLE/TABLE
Processing object type TABLE_EXPORT/TABLE/CONSTRAINT/CONSTRAINT
. . exported "TEST"."EMP" 5.101 KB 5 rows
Master table "SYS"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded
******************************************************************************
Dump file set for SYS.SYS_EXPORT_TABLE_01 is:
C:\BACKUP\TABLE.DMP
Job "SYS"."SYS_EXPORT_TABLE_01" successfully completed at Wed Apr 17 15:41:50 2024 elapsed 0 00:00:13
#Export the table with default compression algorithm and see he size of the dump file.
C:\Windows\System32>expdp directory=DIR_TEST tables=test.emp dumpfile=table.dmp logfile=table.log COMPRESSION=DATA_ONLY COMPRESSION_ALGORITHM=BASIC
Export: Release 19.0.0.0.0 - Production on Wed Apr 17 15:44:19 2024
Version 19.16.0.0.0
Copyright (c) 1982, 2022, Oracle and/or its affiliates. All rights reserved.
Username: / as sysdba
Connected to: Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Starting "SYS"."SYS_EXPORT_TABLE_01": /******** AS SYSDBA directory=DIR_TEST tables=test.emp dumpfile=table.dmp logfile=table.log COMPRESSION=DATA_ONLY COMPRESSION_ALGORITHM=BASIC
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
Processing object type TABLE_EXPORT/TABLE/INDEX/STATISTICS/INDEX_STATISTICS
Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
Processing object type TABLE_EXPORT/TABLE/STATISTICS/MARKER
Processing object type TABLE_EXPORT/TABLE/TABLE
Processing object type TABLE_EXPORT/TABLE/CONSTRAINT/CONSTRAINT
. . exported "TEST"."EMP" 5.101 KB 5 rows
Master table "SYS"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded
******************************************************************************
Dump file set for SYS.SYS_EXPORT_TABLE_01 is:
C:\BACKUP\TABLE.DMP
Job "SYS"."SYS_EXPORT_TABLE_01" successfully completed at Wed Apr 17 15:44:37 2024 elapsed 0 00:00:13
#Export the table with compression algorithm as LOW and see he size of the dump file.
C:\Windows\System32>expdp directory=DIR_TEST tables=test.emp dumpfile=table.dmp logfile=table.log COMPRESSION=DATA_ONLY COMPRESSION_ALGORITHM=LOW
Export: Release 19.0.0.0.0 - Production on Wed Apr 17 15:45:45 2024
Version 19.16.0.0.0
Copyright (c) 1982, 2022, Oracle and/or its affiliates. All rights reserved.
Username: / as sysdba
Connected to: Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Starting "SYS"."SYS_EXPORT_TABLE_01": /******** AS SYSDBA directory=DIR_TEST tables=test.emp dumpfile=table.dmp logfile=table.log COMPRESSION=DATA_ONLY COMPRESSION_ALGORITHM=LOW
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
Processing object type TABLE_EXPORT/TABLE/INDEX/STATISTICS/INDEX_STATISTICS
Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
Processing object type TABLE_EXPORT/TABLE/STATISTICS/MARKER
Processing object type TABLE_EXPORT/TABLE/TABLE
Processing object type TABLE_EXPORT/TABLE/CONSTRAINT/CONSTRAINT
. . exported "TEST"."EMP" 4.796 KB 5 rows
Master table "SYS"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded
******************************************************************************
Dump file set for SYS.SYS_EXPORT_TABLE_01 is:
C:\BACKUP\TABLE.DMP
Job "SYS"."SYS_EXPORT_TABLE_01" successfully completed at Wed Apr 17 15:46:01 2024 elapsed 0 00:00:13
#Export the table with compression algorithm as MEDIUM and see he size of the dump file.
C:\Windows\System32>expdp directory=DIR_TEST tables=test.emp dumpfile=table.dmp logfile=table.log COMPRESSION=DATA_ONLY COMPRESSION_ALGORITHM=MEDIUM
Export: Release 19.0.0.0.0 - Production on Wed Apr 17 15:46:56 2024
Version 19.16.0.0.0
Copyright (c) 1982, 2022, Oracle and/or its affiliates. All rights reserved.
Username: / as sysdba
Connected to: Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Starting "SYS"."SYS_EXPORT_TABLE_01": /******** AS SYSDBA directory=DIR_TEST tables=test.emp dumpfile=table.dmp logfile=table.log COMPRESSION=DATA_ONLY COMPRESSION_ALGORITHM=MEDIUM
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
Processing object type TABLE_EXPORT/TABLE/INDEX/STATISTICS/INDEX_STATISTICS
Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
Processing object type TABLE_EXPORT/TABLE/STATISTICS/MARKER
Processing object type TABLE_EXPORT/TABLE/TABLE
Processing object type TABLE_EXPORT/TABLE/CONSTRAINT/CONSTRAINT
. . exported "TEST"."EMP" 4.742 KB 5 rows
Master table "SYS"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded
******************************************************************************
Dump file set for SYS.SYS_EXPORT_TABLE_01 is:
C:\BACKUP\TABLE.DMP
Job "SYS"."SYS_EXPORT_TABLE_01" successfully completed at Wed Apr 17 15:47:12 2024 elapsed 0 00:00:14
#Export the table with compression algorithm as HIGH and see he size of the dump file.
C:\Windows\System32>expdp directory=DIR_TEST tables=test.emp dumpfile=table.dmp logfile=table.log COMPRESSION=DATA_ONLY COMPRESSION_ALGORITHM=HIGH
Export: Release 19.0.0.0.0 - Production on Wed Apr 17 15:48:06 2024
Version 19.16.0.0.0
Copyright (c) 1982, 2022, Oracle and/or its affiliates. All rights reserved.
Username: / as sysdba
Connected to: Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Starting "SYS"."SYS_EXPORT_TABLE_01": /******** AS SYSDBA directory=DIR_TEST tables=test.emp dumpfile=table.dmp logfile=table.log COMPRESSION=DATA_ONLY COMPRESSION_ALGORITHM=HIGH
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
Processing object type TABLE_EXPORT/TABLE/INDEX/STATISTICS/INDEX_STATISTICS
Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
Processing object type TABLE_EXPORT/TABLE/STATISTICS/MARKER
Processing object type TABLE_EXPORT/TABLE/TABLE
Processing object type TABLE_EXPORT/TABLE/CONSTRAINT/CONSTRAINT
. . exported "TEST"."EMP" 4.695 KB 5 rows
Master table "SYS"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded
******************************************************************************
Dump file set for SYS.SYS_EXPORT_TABLE_01 is:
C:\BACKUP\TABLE.DMP
Job "SYS"."SYS_EXPORT_TABLE_01" successfully completed at Wed Apr 17 15:48:22 2024 elapsed 0 00:00:13
See the dump file size differences with different compression algorithms.
Sr. No. | Table Name | Table Size (KB) | Compression | Algorithm | Dump File Size(KB) |
EMP | 64 | METADATA_ONLY | Without Algorithm | 192 | |
EMP | 64 | DATA_ONLY | Without Algorithm | 76 | |
EMP | 64 | DATA_ONLY | BASIC | 76 | |
EMP | 64 | DATA_ONLY | LOW | 80 | |
EMP | 64 | DATA_ONLY | MEDIUM | 72 | |
EMP | 64 | DATA_ONLY | HIGH | 68 |
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