Server Change Data Capture
Jul 28, 2015
When using Change Data Capture on SQL Server 2012 I have researched that you cannot truncate data in a table. Is this also true if one wanted to delete data from the table? Getting a little confused about what DDL statements can be ran against a table with CDC enabled. Does CDC have to be disabled before performing certain DDL statements against a table?
I would like to safeguard the truncation and dropping of certain tables within the dbo schema. Wondering if I could do this with one fail swoop with CDC enabled on those tables. The other option would be to use a DDL trigger to prevent certain DDL statements to be performed.
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Aug 12, 2015
I have a requirement to implement CDC for 50+ tables to implement incremental data changes warehouse/reporting rather than exporting the whole table data. The largest table is having more than half a billion records.
The warehouse use a daily copy of OLTP db (daily DB refresh). How can I accomplish this. Is there a downside in implementing CDC just for the sake of taking incremental changes on the tables?
Is there any performance impact if we enable CDC on OLTP db?
Can we make use of the CDC tables on the environment we do daily db refresh so that the queries don't hit OLTP database?
What is the best way to implement CDC to take incremental changes for reporting.
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Jan 28, 2015
I am trying to use change data capture to load the data into the secondtable from table 1 which is coming from UI.
What will be the minimum latency??? Can we use incase of latency less than 5 seconds.
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Dec 3, 2007
Hi All,
I am now working on the design phase of my project, we are looking to implement Change Data Capture (CDC) but i need some help if you guys has implemented before using the SSIS 2005 componets. I am trying to use the Following:
Source---------Derived Column---------Lookup---------------Conditional Split (to split New records and Updated Records)-----------Destination. Respectively.
Lets make it clear, my source holds (Old records and newly added or Updated records), the Derived Column is to Derive new columns called Insert_Date and Update_Date. The Lookup i am Using is to look the Fact_Table(the Old Records) as Reference, and then based on this lookup i will split the records on timely based using the Conditional Split. My question is
1. Am i using the right components?
2. what consideration should i have to see to make it true (some Logics on the conditional split)?
3. Any script which helps in this strategy?
4. If you have a better idea please try to help me, i need you help badly.
Thank you,
SamiDC
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Jan 13, 2013
Or can it record before and after column changes based on the LSN only?
An extract from a file based legacy accounting system is performed every night. The system does not have a primary key because transactions are managed through program code. (the more things change...). The extract is copied to text in Unix and FTP'd to Windows, where the file is loaded into SQL Server by kill & fill. Because of the expense of modifying the source system, there is enormous inertia/resistance to injecting a primary key at the source, so kill & fill it stays.
In reading about Change Data Capture, it seemed to me that column level insert update and delete are stored in tables that remember the before and after content of each column tracked. In my reading I have seen many references to the LSN to decide when and what to record as changed, but I have not seen any refereference to the necessity of a primary key for Change Data Capture to work. This is in contrast to replication, where the requirement for the existence of a primary key is made plain.
Is it possible to use Change Data Capture against a table without a primary key? How to use it to change the extract from kill and fill to incremental.
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Jan 13, 2006
Again, looking for the best way to do this with SSIS.
I have a source table and I'd like to load it to a database daily, capturing what changed.
This is not a dimentional table but a fact table.
So, what I;d need to do for each record is to see if the record already exists (using business key) and if it does - compare some of the data fields and of there are changes - register it somehow and if not changes ignore.
Right now, the only two ways I see to do it with SSIS:
- Use Slowly Chaging Dimentions transformation
- Use Lookup and customize SQL, adding something like: WHERE key = ? and (field1 <> ? or field2 <> ?...)
I was wondering of there an easy way.
Dima.
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Oct 17, 2007
Is there a built in functionality to do the CDS in SSIS 2005? if not, what is the best way to do this in ssis 2005?
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Apr 21, 2014
I am using SQL Server 2012 and to me a part of data captured by CDC is not making sense.
I have a table called 'Schema.Table1', and I enabled CDC on it by running 'sys.sp_cdc_enable_table'. I see that a table called 'cdc.Schema_Table1_CT' got created which now gets an entry when ever I Insert, Update or delete a record in the original table.
Till this point every thing works fine.
My original Table has a NOT NULL INT column called 'AuditTrackerUserID' with a default value of 1996. My application does not provides a value for this column, but because the column itself has a default value, records get inserted without error.
When I try to execute the following Query I see multiple records with __$operation of 3 and 1.
SELECT * from cdc.Schema_Table1_CT where AuditTrackerUserID IS NULL
My expectation is that I should not ever see any record returned by this query because AuditTrackerUserID is a not null column, but I do.
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Oct 29, 2015
We have enabled Change Data Capture for auditing our table changes in SQL Server 2008. There is a request to NULL out a few columns (for all rows) in a couple CDC tables, due to compliance with a certification. Is there a compelling reason not to modify these tables and to leave the audit trail as-is?
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Jul 14, 2015
SQL Server 2008R2: Enabling Change Data Capture on a replicated database or its tables will have any performance impact on existing transactional replication.Is it possible to use both of them con temporarily.
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Jun 9, 2015
I have 5 tables that are joined respectively,
Each one of the tables listed below has a “CreateDateTime” and “UpdateDateTime” fields, I need to get yesterday changes, I can get any record where either CreateDateTime or UpdateDateTime is greater than midnight yesterday butI need to watch dates on all of the tables so I need to do atleast 10 date checks.
If any table shows an updated or created record, I need to gather ALL of the information for that customer. So, if my name didn’t change (SCUS table), but my email does (SEML table), I have to pull out both the SCUS and SEML tables (and the others, of course). So It may not be simple WHERE clause, How can I achieve this:
SELECT
SCUS.CUSFULLNAME
,
SCUS.CUSMIDDLENM
,
SCUS.CUSLASTNM ,
[Code] ....
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Mar 23, 2015
I have located a bug in the functions cdc.fn_cdc_get_net_changes_<capture_instance> generated when you enable cdc on a table. This bug can be triggered if 2 rows are created in the _CT table having the same values for the __$start_lsn, __$seqval and the table's key column(s). From research on the internet I have found such rows can be created by a "deferred update": a single update statement in which a column that is part of a unique constraint is updated.
In order to report the bug with Microsoft I need to create a complete series of steps-to-reproduce. But even though the situation happens several times a day in our production environment, I have not yet been able to reproduce it in my test environment.I need a single update statement (plus maybe some steps in advance) that make that the log reader inserts 2 rows into the _CT table, one with __$operation = 1 (delete) and another with __$operation = 2 (insert) as opposed to the single row with __$operation = 4 that it inserts for a normal update. Below is the script I have so far to create a fresh database, enable cdc, create a test table, insert some data and update this data.
I would have liked the last update statement to be handled as a "deferred update". However in all of my tests the log reader just simply inserts a single row into the cdc.dbo_NETTEST_CT table.how to reproduce the situation where I get the 2 rows with __$operation 1 and 2 from a single update statement instead of the single row with __$operation = 4.
CREATE DATABASE [cdcnet]
CONTAINMENT = NONE
ON PRIMARY
( NAME = N'cdcnet', FILENAME = N'S:SQLDATAcdcnet.mdf' , SIZE = 4096KB , FILEGROWTH = 1024KB )
LOG ON
( NAME = N'cdcnet_log', FILENAME = N'T:SQLLOGcdcnet_log.ldf' , SIZE = 1024KB , FILEGROWTH = 10%)
[code]....
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Jul 8, 2015
I get the following error message when a job calls a Stored Procedure that TRUNCATES a Table:
Cannot truncate table 'CombinedSurveyData' because it is published for replication or enabled for Change Data Capture
Is my only option to change the TRUNCATE to DELETE?
[URL]
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Jan 22, 2015
I have a matrix table. These status can be changed by the user and I want to capture each change in database with out updating the earlier status
Pending
Activated
In PROGRESS
Submitted
Completed
Pending can be changed to submitted or completed. For one form there can be different status at different time. And each status must be saved in the database table. How can I design a table...
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May 21, 2015
I have a task where I'm dealing with Employee information. I load this data on a daily basis where I capture Name,Is_Active,Address information of the employee and I do truncate and load operation. Now I have a task to have a additional column called 'Statuschanged_dt' and have to capture the date when Is_Active changed from 'Yes' to 'No'. I know this can done in multiple ways like destination lookup, SCD and also CDC.
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Feb 1, 2012
I am task with identifying the source database name, id, and server name for each staging table that I create. I need to add this to a derived column on all staging tables created from merging same tables on different servers together.
When doing a Merge Join, there is no way to identify the source of data so I would like to see if data came from one database more than the other servers or if their are duplicates across servers.
The thing that bugs me about SSIS Data Flow task is there is no way to do an easy Execute SQL Task after I select my ADO.NET Source to get this information because my connection string is dynamic and there is no way of know which data source is being picked up at runtime.
For Example I have Products table on Server 1 and 2:
Server 2 has more Products and would like to join the two together to create a staging table.
I want see the following:
Product ID, Product Name, Qty, Src_DB_ID, Src_DB_Name, Src_Server_Name
1 IPAD 1000 2, MyDB1, Server1
100 ASUS Pad 40 1, YourDB, Server2
get database name and server name in DATA FLOW only (without using a for each in Control Flow)
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Mar 18, 2015
I setup data collection on a production server to capture growth rates.
When I run the dis usage report, it shows a daily growth rate of over 500 megs. This seems excessive to me.
As a troubleshooting step I then ran sp_space used and got these results:
database_namedatabase_sizeunallocated space
rgc_prod 273442.63 MB3648.48 MB
reserved data index_size unused
265345488 KB164385384 KB99826072 KB1134032 KB
What should my next steps be to try and determine why there is so much growth? And isn't the index size rather large?
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Sep 3, 2007
I have a table with a field "StartedAt". I wish to capture all the data in that table which has Yestarday's StartAt date.
My script below captures the data which has yestardays "StartedAt" info as well as today's date till now. How can i capture only yestardays info only.
SELECT StartedAt
FROM myTable
WHERE StartedAt >= DATEADD(day, DATEDIFF(day, 0, getdate()), -1)
please help.
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Jul 7, 1999
I want to tune the indexes on my database and I am trying to use the SQL Server Profiler to collect data for the Index tuning wizard to analyze. My question is what do I need to trace with the profiler so that the Index tuning wizard can work? I am looking at the trace properties in Profiler at the Events, Data Columns, and Filters tabs but I have no idea of what I need to capture.
Thanks in advance.
Mike
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Jul 24, 2015
I want to create a SSIS package as follows
Conditions
If there are about 100 records in text file, if there is an error at 43 and at 67 record respectively , it should capture 43 and 67 record in failure folder and remaining 98 records , should be processed
1) Successful record into table and move the success record from the folder
to new path say( Success folder) (98 records to table)
2) Unsuccessful records to new path (Failure folder) (2 lines )
3) Error message to capture the failed records and store them in another folder(Error log) (2 line failure information)
While writing the 3rd condition to error log table , it has to point out the record which is failed for what reason, say it may be due to invalid data type for column 10 for 43 record, and incorrect syntax error at 67 record.
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Sep 26, 2007
I have 2 tables, table one with 772 pieces of compliant data. Table 2 has 435 pieces of data that meet another criteria (all the columns are identical it was just passes through an additional filter). I need to capture the values that are excluded from table 2.
Example Table 1
ID some value
1 x
2 x
3 x
4 x
5 x
Table 2
ID some value
2 x
3 x
5 x
I need to capture the data from ID 1 and 4 and assign a new value to it, it is extra compliant data. Thanks!
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Jun 25, 2015
My objective is to extract the source table data from SQL/Oracle or CSV files and load into destination table using CDC mechansim. May I know the steps required to implement in production from development.
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Sep 18, 2007
Let me preface by saying I am not very familiar with SSIS.
Ideally, since the Transfer SQL Server Objects task can do all tables, I would like to use it to copy only data from one server to a new server that has the tables pre-created. When I encounter any kind of error, in addition to the error information provided by SSIS, I also need the actual row data.
If using the Transfer Object task can't do that, how would I loop through all the tables on an OLEDB source and capture the same error information on the destination? I figured out how to do the Data Flow a table with a redirect error output but that does not give me the actual row data.
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Oct 17, 2014
I want to change duplicate data in my sql server column.
the data= 'Barack Obama' , what I want
'Barack Obama 23453'
I have the following query:
UPDATE klant SET naamvoornaam=naamvoornaam + CAST(klantnummer AS VARCHAR)
WHERE naamvoornaam NOT IN (
SELECT(naamvoornaam)
FROM klant
GROUP BY naamvoornaam
HAVING ( COUNT(naamvoornaam) = 1 ))
Message from messages:
String or binary data would be truncated.
I think the max length exceeds the length of the destination column. I've tried:
Max(Len(naamvoornaam + CAST(klantnummer AS VARCHAR)))
message from messages:
An aggregate may not appear in the set list of an UPDATE statement.
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Jul 31, 2013
I am working on an HR project and I have one final component that I am stuck on.
I have an Excel File that is loaded into a folder every month.
I have built a package that captures the data from the excel file and loads it into a staging table (transforming a few bits of data).
I then combine it with another table in a view.
I have another package that loads that view into a Master table and I have added a Slowly Changing Dimension so that it only updates what has been changed. (it’s a table of all employees, positions, hire dates, term dates etc).
Our HR wants to have this data in a report (with charts and tables) and they wanted it to be in a familiar format. So I made a data connection with Excel loading the data into a series of pivot tables.
I have one final component that i cant seem to figure out. At the end of every year I need to capture a count of all Active Employees and all Termed employees for that year. Just a count.
So the data will look like this.
|Year|HistoricalHC|NumbTermedEmp|
|2010|447 |57 |
|2011|419 |67 |
|2012|420 |51 |
The data is in one table labeled [EEMaster]. To test the count I have the following.
SELECT COUNT([PersNo]) AS HistoricalHC
FROM [dbo].[EEMaster]
WHERE [ChangeStatus] = 'Current' AND [EmpStatusName] = 'Active'
this returns the HistoricalHC for 2013 as 418.
SELECT COUNT([PersNo]) AS NumbOfTermEE
FROM [dbo].[EEMaster]
WHERE [ChangeStatus] = 'Current' AND [EmpStatusName] = 'Withdrawn' AND [TermYear] = '2013'
This returns the Number of Termed employees for 2013 as 42.
I have created a table to report from called [dbo.TORateFY] that I have manually entered previous years data into.
|Year|HistoricalHC|NumbTermedEmp|
|2010|447 |57 |
|2011|419 |67 |
|2012|420 |51 |
I need a script (or possibly a couple of scripts) that will add the numbers every year with the year that the data came from.
(so on Dec 31st this package will run and add |2013|418|42| to the next row, and so on.
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May 6, 2015
I need reflecting changes of csv file in oracle DB. Suppose, I load single csv file in oracle DB which contains 10 rows. After some time, I have loaded another CSV file which has the modified row of the previously loaded csv file. So, how can I capture the CSV changes and how it is going to get reflected in oracle DB?There is no unique column in csv file to identify particular row.
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Mar 3, 2015
I am in process to develop TSql code to identify change in data.
I read about Binary_checksum and hashbyte. Some people say hashbyte is better than binay_checksum as chances of collision are less.
But if we may consider following, chances exist in hashbyte too. My question is what is the best way to compare data to identify change (I can't configure CDC) ?
select HASHBYTES('SHA','121'+'34'), HASHBYTES('SHA','12'+'134'),BINARY_CHECKSUM('121','34'),BINARY_CHECKSUM('12','134');
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Dec 29, 2006
Hi,
I had SQL Server 2000 installed like below:
Installation Directory = C:Program FilesMicrosoft SQL Server
Default data directory = D:
Default log directory = D:
I found out that the data is stored in D:Program FilesMicrosoft SQL ServerMSSQLdata and backup is done in D:Program FilesMicrosoft SQL ServerMSSQLackup
However, Microsoft says we should never put the ..ackup and ..data folders in the same partition.
My question is: How can I move the path of the backup directory?
I checked the registy but this is what I found:
HKEY_LOCAL_MACHINESOFTWAREMicrosoftMSSQLServerMSSQLServer
..BackupDirectory=C:Program FilesMicrosoft SQL ServerMSSQLackup (<-- note it is pointing to C: not D:)
..DefaultData=D:
Can somebody help please?
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Apr 18, 2007
I have connected to the SQL Server 2005 instance usign the SQL Server Management Studio; I have changed the default locations for the database and log files. I have also rebooted the machine. When I look in the SQL Server Configuration Manager in the properties for the SQL Server (MSSQLSERVER) I see that the data path is still set to the old value and this field is read-only. How can this can changed without going through the registry?
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Aug 29, 2014
I need to extract a price from a package solution table that was current on a certain date.
Columns are:
Product_Reference int,
Change_Date int, -- Note that this is in yyyymmdd format
Price decimal
So for one items you would get
Product_ReferenceChange_DatePrice
100014200401281.59
100014200605131.75
100014200802121.99
100014200906252.35
100014201002242.50
100014201107151.10
100014201205151.15
The challenge is to return the price of the item on 20070906. In this example 1.75.
I've tried joining it to itself
SELECT DISTINCT p1.[Product_Reference]
,p1.[Change_Date]
,p1.[Price]
FROM PHistory p1
INNER JOIN PHistory p2
ON p1.Product_Reference = p2.Product_Reference
WHERE p1.Product_Reference = 100014
AND p1.Change_Date >= 20070906
and p2.Change_Date < 20070906
But it returns the price above and below that date.
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Mar 21, 2015
I'm trying to quantify the number of times folks use SQL Server Management Studio to change client data in one of our production databases. Does SQL Server keep this statistic? How do I get to this data?
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Dec 17, 2007
Is there any data type in SQL Server 2005 which captures only the TIME in default DATETIME type?
For example, if the datatime field has a value 2007-12-11 12:31:00.000, i need a datatype which can capture 12:31:00.000 alone. The data type should be in a fashion so that i can find differences in time also...
Any ideas??
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Aug 14, 2015
Is it possible to capture the contents of THROW within a CATCH into a variable so that it can be written to a logging table?
I can capture ERROR_MESSAGE() to a variable but unfortunately it only writes the last error rather than the previous one that is informational.
I realize that THROW can be multiple lines so it may not be possible to do through TSQL but thought I should ask.
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