I want export data something like this.
exp xxx/xxx file=d:\xxx.dmp owner=xxx query=\"where rownum < 1000\"
But I get an error "QUERY parameter is only use in table mode"
Oracle version 10g
As #Thilo says, with exp you can only user the query parameter in table mode. If you're able to use the newer data pump functionality, via the expdp command, you can apply a similar query parameter to the whole export.
#Thilo is right, you can export a single table or a SUBSET of a single table
I also recommend reading Tom's advice in regards to using parfile
Related
I need to mask first and last name. Our requirement is to use the first name only. How can I access the FIRST_NM field when masking the LAST_NM?
LAST_NM=substr(FIRST_NM,1,4)||'LAST'
select T.EE_FIRST_NM, T.EE_LAST_NM from MY_TABLE
Original:
Lakshmanan Ramaswamy
Expected Result:
LaksFIRST LaksLAST
Looks like REMAP_DATA is available from Oracle 11g on. The issue is the REMAP_DATA parameter takes one column as input and a PL/SQL package/function to process that data; so you wouldn't really be able to figure out what first name goes with what last name. There is a good DataPump REMAP_DATA PDF on a sample package & function would work; but it won't solve your problem.
What you could do, depending on your Oracle version, is define a virtual column named LAST_NAME_MASKED on your MY_TABLE that contains a function to do your substr, and then exclude the LAST_NM column from the DataPump export.
I have created a temporary table in oracle sql developer but I forgot to save it and now I want to reuse the query but I don't remember the code used then. Is there a process to get query used creation of temp table?
You can use dbms_metadata.get_ddl()
select dbms_metadata.get_ddl('TABLE', 'YOUR_TABLE_NAME_HERE')
from dual;
The result is a CLOB with the complete DDL. You might need to adjust the display in SQL Developer to make the content of that value fully visible (I don't use SQL Developer, so I don't know if that is necessary and if so, what you would need to do)
Edit:
It seems SQL Developer can't display the result of this query properly unless you use the "Run Script" option. And with that you need to use a SET LONG 60000 (or some other big number) before you run it, to see the complete source code:
I have written a program using pyspark to connect to oracle database and fetch data. Below command works fine and returns the contents of the table:
sqlContext.read.format("jdbc")
.option("url","jdbc:oracle:thin:user/password#dbserver:port/dbname")
.option("dbtable","SCHEMA.TABLE")
.option("driver","oracle.jdbc.driver.OracleDriver")
.load().show()
Now I do not want to load the entire table data. I want to load selected records. Can I specify select query as part of this command? If yes how?
Note: I can use dataframe and execute select query on the top of it but I do not want to do it. Please help!!
You can use subquery in dbtable option
.option("dbtable", "(SELECT * FROM tableName) AS tmp where x = 1")
Here is similar question, but about MySQL
In general, the optimizer SHOULD be able to push down any relevant select and where elements so if you now do df.select("a","b","c").where("d<10") then in general this should be pushed down to oracle. You can check it by doing df.explain(true) on the final dataframe.
I am using Oracle 11g and Toad for Oracle. How can I display execution plan for queries?
In Sql server management studio execution plan can be displayed as graphical format. Is there any functionality/tool like that on Toad for oracle?
CTRL-E
Make sure you've ended the query with a semi-colon (and the query above)
Edit:
You need to set-up the TOAD plan table for use. If you think it's already setup on your DB then you may just need to be granted access. Alternatively in my slightly older version of TOAD it's under:
Database --> Administer --> Server Side Objects Wizard. From here you can create the plan table(s) in a schema that you choose.
You should create the PLAN_TABLE using a script provided by Oracle
which is named UTLXPLAN.SQL and is located in one of the installation folders
on the database server.
Then, you should use the EXPLAIN PLAN statement for generating a plan for a SQL statement, like this:
EXPLAIN PLAN SET STATEMENT_ID = 'your_identifier_for_this_plan'
FOR
... your statement ... ;
Then, you can use either a select from PLAN_TABLE (usually using a hierarchical query) or the DBMS_XPLAN.DISPLAY_PLAN procedure to display the plan.
In the same folder where the UTLXPLAN.SQL file is located, there usually exist
examples of using this procedure.
Also, in SQL*PLUS you can use the SET AUTOTRACE feature.
For TOAD FOR ORACLE
this helped me How do I view the Explain Plan in Oracle Sql developer?, I just write what they did in sql developer and wrote in the toad editor and then execute.
Example
explain plan for select field1, field2 from TABLE_NAME;
SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY);
Check that all queries end with a semicolon, put the cursor on the query you want to analyze and hit CTRL-E.
The first time you could get a popup that asks for the name of the plan table, it suggests TOAD_PLAN_TABLE but it's better to use the standard Oracle table PLAN_TABLE that should be already available. So enter PLAN_TABLE in place of TOAD_PLAN_TABLE (do not specify a schema) and hit OK. You should get a message saying that the object already exists: hit OK again to acknowledge it. Now try CTRL-E again and you'll get the explain plan.
To view/change the currently configured plan table name go to menu "View / Toad Options / Oracle General".
I have an entire DB to be imported as a dump into my own. I want to exclude data out of certain tables(mostly because they are huge in size and not useful). I cannot entirely exclude those tables since I need the table object per se(minus the data) and will have to re create them in my schema if I do so. Also in the absence of those table objects , various other foreign constraints defined on other tables will also fail to be imported and will need to be redefined.So I need to exclude just the data from certain tables.I want data from all other tables though.
Is there a set of parameters for impdp that can help me do so?
I would make two runs at it: The first I would import metadata only:
impdp ... CONTENT=METADATA_ONLY
The second would include the data only for the tables I was interested in:
impdp ... CONTENT=DATA_ONLY TABLES=table1,table2...
Definitely make 2 runs. One to create all the table objects, but instead of using tables in the second impdp run, use the exclude
impdp ... Content=data_only exclude=TABLE:"IN ('table1', 'table2')"
The other way works, but this way you only have to list the tables you don't want versus all that you want.
If the size of the table is big for export import the you can use "SAMPLE" parameter in expdp command to take export of table for what ever percentage you want ....
$ expdp tables=T100test DIRECTORY=expimp1 DUMPFILE=test12.dmp SAMPLE = 10;
This command will export only 10% data of the T100test table's data.
Syntax:
EXCLUDE=[object_type]:[name_clause],[object_type]:[name_clause]
INCLUDE=[object_type]:[name_clause],[object_type]:[name_clause]
Examples of operator-usage:
EXCLUDE=SEQUENCE
or EXCLUDE=TABLE:"IN ('EMP','DEPT')"
or EXCLUDE=INDEX:"= 'MY_INDX'"
or INCLUDE=PROCEDURE:"LIKE 'MY_PROC_%'"
or INCLUDE=TABLE:"> 'E'"
The parameter can also be stored in a parameter file, for example: exp.par
DIRECTORY = my_dir
DUMPFILE = exp_tab.dmp
LOGFILE = exp_tab.log
SCHEMAS = scott
INCLUDE = TABLE:"IN ('EMP', 'DEPT')"
It seems you can exclude directly when importing using impdp query parameter
impdp [...] QUERY='TABLE_NAME:"WHERE rownum = 0"'
cf : community.oracle.com