I have a Oracle server which is very highly loaded. I want to Select big table with several millions rows of data and download the data using SQL Developer. How I can do this with little performance impact of the production database?
use oracle's export tool for most efficient dump of data from a table.
example
exp user/password tables=mytable query="optional where clause here"
Note you have to have oracle client installed to use it.
Related
I've got to update the data of an Oracle DB but I'm not the owner and ain't got any Oracle License.
The goal is to explain to my interlocutor how to create a dump from his Oracle DB, to find out how to restore this dump in a DB (a free version of Oracle or something else), update some data in some tables, and then make another dump to send it back to my interlocutor.
So the differents questions I have are:
1- Is it possible to create a dump (maybe in SQL format) without any specifics dependencies to Oracle ?
2- Is there a way to restore this dump in a free lightweight Oracle, or another kind of DB like Postgresql ?
3- Does Oracle, is able to handle any kind of dump et restore it in an Oracle DB or is there any constraints to respect ?
I am very new to Oracle and ain't got, on my personal computer, any possibility to try out the dump/restore by myself; that's why, any help will be appreciated !
1- Is it possible to create a dump (maybe in SQL format) without any specifics dependencies to Oracle ?
Oracle offers Data Pump utilities (export and import) for such purposes. You'd export table (or schema) - result is a ".dmp" file, readable by import utility. You'd then move that file to your own server (see #2 for the rest)
2- Is there a way to restore this dump in a free lightweight Oracle, or another kind of DB like Postgresql ?
On your own server (which could be a laptop; no problem), you'd install a free Oracle Express Edition (XE) database. Currently, the last version is 21c, but some others should still be available in Oracle Technology Network's Download section.
3- Does Oracle, is able to handle any kind of dump et restore it in an Oracle DB or is there any constraints to respect ?
XE database has its limits - from your point of view, the most important is that it can handle up to 12GB of user data. Therefore, if the .dmp file doesn't contain more data than that, you should be able to import it.
Another constraint is the compatibility. Not all exports can be imported into all databases. There's a matrix which shows which versions match; it is available on My Oracle Support site (but you have to have access to it, which you - as you said - don't. Though, generally speaking, "close" Oracle database versions can interchange .dmp files. It would be best if these two database versions match, of course.
Data was sent to our company with PostgreSQL, but we are prohibited to use the tools of PostgreSQL , permitted the use of only Oracle.
How to migrate data from PostgreSQL to Oracle without using a third party application(they are also prohibited)? You can only use the tools of Oracle.
I found this article https://support.oracle.com/knowledge/Oracle%20Database%20Products/2220826_1.html but we don't have Support Identifier
We have one .sql file. It weighs 8 Gigabytes.
It looks like you have so many impediments in your company. Regarding Oracle's SQL Developer Migration Workbench, unfortunately it does not support the migration of PostgreSQL databases. However, the following 3rd-party software tools are available and may assist in migration, but I am afraid you cannot use them as you said that those products are forbidden:
http://www.easyfrom.net/download/?gclid=CNPntY36vsQCFUoqjgodHnsA0w#.VRBHKGPVuRQ
http://www.sqlines.com/postgresql-to-oracle
Other options will only move the data from your Postgresql database to Oracle database, it means that you must have the DDLs of the tables before to run the import:
To move data only, you can generate a flat file of the the
PostgreSQL data and use Oracle SQL*Loader.
Another option to migrate data only is to use Oracle Database
Gateway for ODBC which requires an ODBC driver to connect to the
PostreSQL database, and copy each table over the network using
sqlplus "COPY" or "CREATE TABLE AS SELECT" commands via oracle
database link.
Also, Oracle has discussion forum for migrating non-oracle databases to Oracle.
http://www.oracle.com/technetwork/database/migration/third-party-093040.html
But, if you have only a sql file, you should look at it to see whether you have both DDLs ( create tables and indexes, etc ) and the data itself as insert statements. If so, you need to split it and treat the DDLs to convert the original data types to Oracle datatypes.
How can I create a script of inserts for my sybase to oracle Migration? The Migration wizard only gives me the option to migrate procedures and triggers and such. But there is no select for just tables. When I try to migrate tables offline and move data. the datamove/ folder is empty. I would also want to only migrate specific tables (ones with long identifiers) because i was able to migrate the rest with Copy to Oracle.
I must also note that i do not want to upgrade to an new version of oracle. Currently on ~12.1 so i need to limit the identifiers.
How can I get the offline scripts for table inserts?
You (probably!) don't want INSERTs for offline migration scripts. If you're just running INSERTs, then the online method would probably suffice.
The point of the Offline strategy is to take the data from your Sybase instance to flat, delimited text files (using BCP), which we can THEN use to load back into an Oracle Database using SQLLDR or External Tables which will be EXPONENTIALLY faster than using INSERT scripts.
Take a look at this whitepaper where I go into offline Sybase migrations in detail.
You can consider DCO-based Sybase-to-Oracle replication via the Sybase Rep Server. This way, not only will you have all data moved, but you will also be able to have DML updates propagated online, which will make your system switchable live.
We have two divisions in our company, one uses E1 on Oracle 11g the other uses SAP on Oracle 11g.
We also have a SQL Server system we use to data warehouse information once a night from both system to run our report server against.
The question I have is for pooled tables in SAP, such as A016, how would I get that information out of SAP?
Currently we have SSIS's setup with a linked server to the two Oracle servers which pull the data we need I just don't have the knowledge of SAP to find the Pooled tables.
if I can't pull the pooled tables because they don't physically exist is there a tool I can use in SAP to find out what tables the pooled table is getting it's information from? This way I can rebuild that table in SQL using a open query and some fun Joins.
Thanks
You have to access those tables using the application server. They can't be accessed directly from the database.
You'll probably want to write an ABAP program to extract the data you need go from there.
I have an Oracle view containing very large amount of data in it and I want to migrate this data in a table in Greenplum database. Is there any way I can write any query in Postgresql to fetch that Oracle view's data?
If not possible by query in Postgresql, kindly suggest me some way to access Oracle view from Linux server, so that I can create data file from that Oracle view to my Linux server and load that file via gpfdist to a Greenplum table.
NOTE: an Oracle view is from third party, I only have an access to view that data (I have all the connection info) I can access that view via SQL Developer
NOTE: Exporting data from SQL Developer to my local machine is not feasible here as the data is very large
Thanks,
Sunny
The last time I used Greenplum (3 years ago) I don't think there were any untrusted languages like plperlu, so fetching directly from Oracle from within Greenplum might not be possible. If the data has a primary key, are you able to fetch in batches, compress it, then ship it to Greenplum?
Do you have a Greenplum support contract? If so, you could also try them if you haven't already: https://sso.emc.com/sso/login.htm
I recall that gpfdist can be configured to fetch from remote servers with a bit of fiddling, so if you are able to copy out the Oracle data to disk, you could fetch it using gpfdist without any intermediary steps.