well my problem is, how could i copy a database with talend from postgresql to sap hana without needing to write a job for every table ?
The reason for this is, because it could take some long time to prepare all those jobs, while taking in consideration, having at least 200 tables, which at least have 30 columns.
I tried tTransferDatabase plugin, but i can't success to transfer it to sap hana, it gives me an error that it can't copy schema (while it successfully worked copying it to other database in postgresql), and i am sure that the schemas names are right.
here is the error:
Exception in component tTransferDatabase_1
java.lang.NullPointerException
at org.apache.ddlutils.PlatformFactory.createNewPlatformInstance(PlatformFactory.java:86)
at org.apache.ddlutils.PlatformFactory.createNewPlatformInstance(PlatformFactory.java:124)
at com.devjpcb.transferdatabase.TransferDatabase.getPlatformDestine(TransferDatabase.java:179)
at com.devjpcb.transferdatabase.TransferDatabase.copySchemaToDatabase(TransferDatabase.java:249)
at local_project.aaasa_0_1.aaasa.tTransferDatabase_1Process(aaasa.java:836)
at local_project.aaasa_0_1.aaasa.runJobInTOS(aaasa.java:1130)
at local_project.aaasa_0_1.aaasa.main(aaasa.java:951)
Is there maybe a chance to do sth like .. for each table in connection, table guess schema, copy columns from table to other side of tmap, run ?
Any advice would be helpful ;), Thank you !
With some work, you could use the example job created by rbaldwin on Talend Exchange; note that it starts with files, not a database. But you could easily create a job that loops through all your database tables and does an extract to file, to then use as the starting point.
Another option is Bekwam's solution
Related
I have been working on a reporting database in DB2 for a month or so, and I have it setup to a pretty decent degree of what I want. I am however noticing small inconsistencies that I have not been able to work out.
Less important, but still annoying:
1) Users claim it takes two login attempts to connect, first always fails, second is a success. (Is there a recommendation for what to check for this?)
More importantly:
2) Whenever I want to refresh the data (which will be nightly), I have a script that drops and then recreates all of the tables. There are 66 tables, each ranging from 10's of records to just under 100,000 records. The data is not massive and takes about 2 minutes to run all 66 tables.
The issue is that once it says it completed, there is usually at least 3-4 tables that did not load any data in them. So the table is deleted and then created, but is empty. The log shows that the command completed successfully and if I run them independently they populate just fine.
If it helps, 95% of the commands are just CAST functions.
While I am sure I am not doing it the recommended way, is there a reason why a number of my tables are not populating? Are the commands executing too fast? Should I lag the Create after the DROP?
(This is DB2 Express-C 11.1 on Windows 2012 R2, The source DB is remote)
Example of my SQL:
DROP TABLE TEST.TIMESHEET;
CREATE TABLE TEST.TIMESHEET AS (
SELECT NAME00, CAST(TIMESHEET_ID AS INTEGER(34))TIMESHEET_ID ....
.. (for 5-50 more columns)
FROM REMOTE_DB.TIMESHEET
)WITH DATA;
It is possible to configure DB2 to tolerate certain SQL errors in nested table expressions.
https://www.ibm.com/support/knowledgecenter/en/SSEPGG_11.5.0/com.ibm.data.fluidquery.doc/topics/iiyfqetnint.html
When the federated server encounters an allowable error, the server allows the error and continues processing the remainder of the query rather than returning an error for the entire query. The result set that the federated server returns can be a partial or an empty result.
However, I assume that your REMOTE_DB.TIMESHEET is simply a nickname, and not a view with nested table expressions, and so any errors when pulling data from the source should be surfaced by DB2. Taking a look at the db2diag.log is likely the way to go - you might even be hitting a Db2 issue.
It might be useful to change your script to TRUNCATE and INSERT into your local tables and see if that helps avoid the issue.
As you say you are maybe not doing things the most efficient way. You could consider using cache tables to take a periodic copy of your remote data https://www.ibm.com/support/knowledgecenter/en/SSEPGG_11.5.0/com.ibm.data.fluidquery.doc/topics/iiyvfed_tuning_cachetbls.html
I am new to talend and need guidance on below scenario:
We have set of 10 Json files with different structure/schema and needs to be loaded into 10 different tables in Redshift db.
Is there a way we can write generic script/job which can iterate through each file and load it into database?
For e.g.:
File Name: abc_< date >.json
Table Name: t_abc
File Name: xyz< date >.json
Table Name: t_xyz
and so on..
Thanks in advance
With Talend Enterprise version one can benefit of dynamic schema. However based on my experiences with json-s they are somewhat nested structures usually. So you'd have to figure out how to flatten them, once thats done it becomes a 1:1 load. However with open studio this will not work due to the missing dynamic schema.
Basically what you could do is: write some java code that transforms your JSON into CSV. Use either psql from commandline or if your Talend contains new enough PostgreSQL JDBC driver then invoke the client side \COPY from it to load the data. If your file and the database table column order matches it should work without needing to specify how many columns you have, so its dynamic, but the data newer "flows" through talend.
Really not cool but also theoretically possible solution: If Redshift supports JSON (Postgres does) then one can create a staging table, with 2 columns: filename, content. Once the whole content is in this staging table, INSERT-SELECT SQL could be created that transforms the JSON into tabular format that can be inserted into the final table.
However, with your toolset you probably have no other choice than to load these files with 1 job per file. And I'd suggest 1 dedicated job to each file. They would each look for their own files and triggered / scheduled individually or be part of a bigger job where you scan the folders and trigger the right job for the right file.
Not able to load multiple tables, getting error:
Exception in component tMysqlInput_1 (MYSQL_DynamicLoading)
java.sql.SQLException: Bad format for Timestamp 'GUINESS' in column 3
One table works fine. Basically after first iteration the second table trying to use the schema
of the first table. Please help, how to edit the component to make it
correct. Trying to load actor & country table from sakila DB mysql to
a another DB on the same server. Above image is for successful one table
dynamic loading.
you should not use tMysqlInput if output schemas differ. For this case there is no way around tJavaRow and custom code. I however cannot guess what happens in tMap, so you should provide some more details about what you want to achieve.
If all you need is to load data from one table to another without any transformations, you can do one of the following:
If your tables reside in 2 different databases on the same server, you can use a tMysqlRow and execute a query "INSERT INTO catalog.table SELECT * from catalog2.table2..". You can do some simple transformations in SQL if needed.
If your tables live in different servers, check the generic solution I suggested for a similar question here. It may need some tweaking depending on your use case, but the general idea is to replicate the functionality of INSERT INTO SELECT when the tables are not on the same server.
I am new to SSIS and am after some assistance in creating an SSIS package to do a specific task. My data is stored remotely within a MySQL Database and this is downloaded to a SQL Server 2014 Database. What I want to do is the following, create a package where I can enter 2 dates that can be compared against the create date/date modified per record on a number of tables to give me a snap shot and compare the MySQL Data to the SQL Data so that I can see if there are any rows that are missing from my local SQL Database or if any need to be updated. Some tables have no dates so I just want to see a record count on what is missing if anything between the 2. If this is better achieved through TSQL I am happy to hear about other suggestions or sites to look at where things have been done similar.
In relation to your query Tab :
"Hi Tab, What happens at the moment is our master data is stored in a MySQL Database, the data was then downloaded to a SQL Server Database as a one off. What happens at the moment is I have a SSIS package that uses the MAX ID which can be found on most of the tables to work out which records are new and just downloads them or updates them. What I want to do is run separate checks on the tables to make sure that during the download nothing has been missed and everything is within sync. In an ideal world I would like to pass in to a SSIS package or tsql stored procedure a date range, shall we say calender week, this would then check for any differences between the remote MySQL database tables and the local SQL tables. It does not currently have to do anything but identify issues, correcting them may come later or changes would need to be made to the existing sync package. Hope his makes more sense."
Thanks P
To do this, you need to implement a Type 1 Slowly Changing Dimension type data flow in SSIS. There are a number of ways to do this, including a built in transformation aptly called the Slowly Changing Dimension transformation. Whilst this is easy to set up, it is a pain to maintain and it runs horrendously slowly.
There are numerous ways to set this up using other transformations or even SQL merge statements which are detailed here: https://bennyaustin.wordpress.com/2010/05/29/alternatives-to-ssis-scd-wizard-component/
I would recommend that you use Lookup transformations as they perform better than the Slowly Changing Dimension transformation but offer better diagnostics and error handling than the better performing SQL merge statement.
Before you do this you will need to add a Checksum or Hashbytes column to your SQL data for ease of comparison with the incoming MySQL data.
In short, calculate some sort of repeatable checksum as the data is downloaded into your SQL Server, then use this in an SSIS Lookup, matching on the row key, to check for changes. Where the checksum value is different for the same row it needs updating and where there is no matching row key in your SQL Data you need to insert the new row.
We're considering using SSIS to maintain a PostgreSql data warehouse. I've used it before between SQL Servers with no problems, but am having a lot of difficulty getting it to play nicely with Postgres. I’m using the evaluation version of the OLEDB PGNP data provider (http://www.postgresql.org/about/news.1004).
I wanted to start with something simple like UPSERT on the fact table (10k-15k rows are updated/inserted daily), but this is proving very difficult (not to mention I’ll want to use surrogate keys in the future).
I’ve attempted (Link) and (http://consultingblogs.emc.com/jamiethomson/archive/2006/09/12/SSIS_3A00_-Checking-if-a-row-exists-and-if-it-does_2C00_-has-it-changed.aspx) which are effectively the same (except I don’t really understand the union all at the end when I’m trying to upsert) But I run into the same problem with parameters when doing the update using a OLEDb command – which I tried to overcome using (http://technet.microsoft.com/en-us/library/ms141773.aspx) but that just doesn’t seem to work, I get a validation error –
The external columns for complent.... are out of sync with the datasource columns... external column “Param_2” needs to be removed from the external columns.
(this error is repeated for the first two parameters as well – never came across this using the sql connection as it supports named parameters)
Has anyone come across this?
AND:
The fact that this simple task is apparently so difficult to do in SSIS suggests I’m using the wrong tool for the job - is there a better (and still flexible) way of doing this? Or would another ETL package be better for use between two Postgres database? -Other options include any listed on (http://en.wikipedia.org/wiki/Extract,_transform,_load#Open-source_ETL_frameworks). I could just go and write a load of SQL to do this for me, but I wanted a neat and easily maintainable solution.
I have used the Slowly Changing Dimension wizard for this with good success. It may give you what you are looking for especially with the Wizard
http://msdn.microsoft.com/en-us/library/ms141715.aspx
The External Columns Out Of Sync: SSIS is Case Sensitive - I encountered this issue multiple times and it makes me want to pull my hair out.
This simple task is going to take some work either way. SSIS is by no means an enterprise class ETL product yet, but it does give you some quick and easy functionality, and is sufficient for most ETL work. I guess it is also about your level of comfort with it as well.
SCD is way too slow for what I want. I need to use set based sql.
It turned out that a lot of my problems were with bugs in the provider.
I opened a forum topic (http://www.pgoledb.com/forum/viewtopic.php?f=4&t=49) and had a useful discussion with the moderator/support/developer person.
Also Postgres doesn't let you do cross db querys, so I solved the problem this way:
Data Source from Production DB to a temp Archive DB table
Run set based query between temp table and archive table
Truncate temp table
Note that the temp table is not atchally a temp table, but a copy of the archive table schema to temporarily stored data in.
Took a while, but I got there in the end.
This simple task is going to take some work either way. SSIS is by no means an enterprise class ETL product yet, but it does give you some quick and easy functionality, and is sufficient for most ETL work. I guess it is also about your level of comfort with it as well.
What enterprise ETL solution would you suggest?