I have 2 Oracle databases v 11.2.0.4.0 (Prod and Test) with the same schema.
Using Oracle SQLDeveloper v.20.2.0.175, 'Tools -> Database Export ...' (Add Force to Views, Grants, Pretty Print, Show Schema, Terminator), no data export, 'Proceed to summary' checked.
The operation gets completed successfully in both cases.
But one database export is a kind of truncated: if I compare diffs, I obviously see that one database export is stopped at views DDLs, while the other ("healthy") export file additionally includes: Synonyms, top-level Functions, Procedures, Packages, Constraints and Indexes.
What can be the reason one database export is incomplete? Several months ago I did same dumps and output files were complete for both databases.
UPD: While making many attempts, I noticed there is always a reconnect
happening approximately after
select i.index_name from all_indexes ...
Statements logging tab shows this query takes tens of seconds on 'Elapsed' column. If I execute this query manually, it takes 2-3 seconds. I think this is directly related to truncated output.
Looks like the problem was caused by reconnect happening all the time at a query looking for indexes. I just used SQL Developer on another Windows machine and the export was successful and complete.
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 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.
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
I'm trying to migrate our database engine from MsSql to PostgreSQL. In our automated test, we restore the database back to "clean" state at the start of every test. We do this by comparing the "diff" between the working copy of the database with the clean copy (table by table). Then copying over any records that have changed. Or deleting any records that have been added. So far this strategy seems to be the best way to go about for us because per test, not a lot of data is changed, and the size of the database is not very big.
Now I'm looking for a way to essentially do the same thing but with PostgreSQL. I'm considering doing the exact same thing with PostgreSQL. But before doing so, I was wondering if anyone else has done something similar and what method you used to restore data in your automated tests.
On a side note - I considered using MsSql's snapshot or backup/restore strategy. The main problem with these methods is that I have to re-establish the db connection from the app after every test, which is not possible at the moment.
If you're okay with some extra storage, and if you (like me) are particularly not interested in re-inventing the wheel in terms of checking for diffs via your own code, you should try creating a new DB (per run) via templates feature of createdb command (or CREATE DATABASE statement) in PostgreSQL.
So for e.g.
(from bash) createdb todayDB -T snapshotDB
or
(from psql) CREATE DATABASE todayDB TEMPLATE snaptshotDB;
Pros:
In theory, always exact same DB by design (no custom logic)
Replication is a file-transfer (not DB restore). So far less time taken (i.e. doesn't run SQL again, doesn't recreate indexes / restore tables etc.)
Cons:
Takes 2x the disk space (although template could be on a low performance NFS etc)
For my specific situation. I decided to go back to the original solution. Which is to compare the "working" copy of the database with "clean" copy of the database.
There are 3 types of changes.
For INSERT records - find max(id) from clean table and delete any record on working table that has higher ID
For UPDATE or DELETE records - find all records in clean table EXCEPT records found in working table. Then UPSERT those records into working table.
How to delete all redundant stored procedures in T-SQL? By saying "redundant", I am talking about SPs that may have different names, but work the same way -- same input, same output. The approaches can be different.
Here is the situation: 20-30 databases with hundreds of tables each, thousands of stored procedures which keeps growing everyday, no version control on stored procedures, and everything we did is on the production databases, no test databases.
Profiler and hard work are the answer. Set profiler to monitor the RPC:Completed event. Remove all possible columns and add the "Text Data" column. The output could be saved then parsed to find stored procedures which have the same paramertes and produce the same output. Check Stored procedure output parameters in SQL Server Profiler for more information on the results of the RPC:Completed event.