Export DataPump with the query option
Hi allMy environment is IBM AIX, Oracle 10.2.0.4.0 database.
I need a few sets of records using a query in export production. Request is attached to several tables. Since we have the BLOB data type, we export using datapump.
We have weaker environments, but have not the same set of data and tables, and therefore not able to simulate the same query in lower environment. But created a small table and faked the query.
My order is
expdp system / < pwd > @orcl tables = dump.dump1 query = dump.dump1:' ' where num < 3 ' ' directory = DATA_PUMP_DIR dumpfile = exp_dp.dmp logfile = exp_dp.log
Query in the command pulls two records directly. By running the command above, I see the size 80KO dump file,
In the export log file.
I see Total estimation using BLOCKS method: 64 KB.
export Dump.Dump1 = 4,921 KB 2 rows.
My doubts are,
(1) is the correct command that I am running.
(2) estimate said 64 k, considering that it says also exported 4,921 KB. But the dump file created is 80KO. It is exported correctly?
(3) given that I run with the use of the system, apart from 2 rows, export all data. We must send the dump file to the other Department. We should not export all of the data other than the query output.
(4) in the order if I am not using "tables = dump.dump1), the export file big mess." Don't know which is the right.
Your answers will be more useful.
The short answer is 'YES', he did the right thing.
The long answer is:
Query in the command pulls two records directly. By running the command above, I see the size 80KO dump file,
In the export log file.I see Total estimation using BLOCKS method: 64 KB.
export Dump.Dump1 = 4,921 KB 2 rows.My doubts are,
(1) is the correct command that I am running.
Yes. As long as you query is correct. DataPump will export on the lines that match this query.
(2) estimate said 64 k, considering that it says also exported 4,921 KB. But the dump file created is 80KO. It is exported correctly?
Estimate is made using the full picture. Since you specify, he used the method of estimation of block. Basically, how many blocks have been attributed to this table. In your case, I guess it was 80KB.
(3) given that I run with the use of the system, apart from 2 rows, export all data. We need to send the dump file to other > Department. We should not export all of the data other than the query output.
I will export all the data, but going to export metadata. It exports the table definition, all indexes on it, all the statistics on tables or indexes, etc. This is why the dump file could be bigger. There is also a 'main' table that describes the export job who gets exproted. This is used by export and import to find what is in the dumpfile, and where in the dumpfile these things are. It is not user data. This table needs to be exported and will take place in the dumpfile.
(4) in the order if I am not using "tables = dump.dump1), the export file big mess." Don't know which is the right.
If you only want this table, then you order export is right. If you want to export more, then you need to change your export command. From what you say, it seems that you order is correct.
If you do not want any expoirted metadata, you can add:
content = data_only
at the command line. This will only export the data and when the dumpfile is imported, it must have the table already created.
Dean
Tags: Database
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