Identifying Object Name for CREATE and ALTER Using fn_dblog()

August 9, 2016 Leave a comment

Last week, Jes Borland (b|t) asked me a question about the transaction log. Those of you who have read my blog or seen me present know that this is my favorite SQL Server topic. Jes’s question was: “For a transaction with a Transaction Name of CREATE/ALTER VIEW, can the name of the view affected by the CREATE or ALTER statement be identified from the log.”

To check, I ran a transaction log backup on a test database on my system to minimize the number of active transaction log records. I created a view in my test database and ran:

SELECT * FROM fn_dblog(NULL,NULL)

fn_dblog() is a table-based function that returns the active transaction records for the database it is executed against. The two NULL parameters are a Start and End LSN number. Looking at the results, the Transaction Name of CREATE/ALTER VIEW showed up on the LOP_BEGIN_XACT log record.

CreateAlterView

The next log record for Transaction ID 0000:000007e6 contains an OBJECT_ID in the result set, highlighted below. In the string 9:98099390:0, 9 is the database id of the object’s database and 98099390 is the object id.

LockInformationView

 

This is the object id of the view that was created.  So, Jes’s question was answered.  But this led me to one of my other favorite SQL Server topics: string manipulation.  The following script will identify all transactions for a particular Transaction Name and return the object name affected.  The comments provide additional information about the functionality.

USE YourDatabase;

/* Declare local variables and drop temp table if it exists. */

IF CHARINDEX('2016',@@VERSION) > 0
BEGIN

	DROP TABLE IF EXISTS #logrecords;

END
ELSE
BEGIN

	IF OBJECT_ID('tempdb..#logrecords') IS NOT NULL
	BEGIN

		DROP TABLE #logrecords;

	END
END

/* Declare local variables */
DECLARE @tranname NVARCHAR(66);
DECLARE @tranid NVARCHAR(28);
DECLARE @loopcount INT = 1;
DECLARE @looplimit INT;

/* Set @tranname to the value you are looking for
   This works for CREATE/ALTER VIEW, CREATE TABLE, and ALTER TABLE
   Currently researching other possibilities */
SELECT @tranname = 'ALTER TABLE';

/* Get all log records associated with the transaction name specified
   The results contain a row number per transaction, so all occurrences
   of the transaction name will be found */
SELECT  ROW_NUMBER() OVER(PARTITION BY [Transaction ID] ORDER BY [Current LSN]) AS Row,
    [Current LSN], [Transaction ID], [Transaction Name], operation, Context, AllocUnitName, AllocUnitId, PartitionId, [Lock Information]
INTO #logrecords
FROM fn_dblog(NULL,NULL)
WHERE [Transaction ID] IN
	(SELECT [Transaction ID]
	FROM fn_dblog(NULL,NULL)
	WHERE [Transaction Name] = @tranname);

SELECT @looplimit = COUNT(*) FROM #logrecords
WHERE [Transaction Name] = @tranname;

/* The object id for the object affected is contained in the [Lock Information] column of the second log record of the transaction
   This WHILE loop finds the second row for each transaction and does lots of string manipulation magic to return the object id
   from a string like this:
   HoBt 0:ACQUIRE_LOCK_SCH_M OBJECT: 9:146099561:0
   Once it finds it, it returns the object name */
WHILE @loopcount <= @looplimit
BEGIN

	SELECT TOP 1 @tranid = [Transaction ID]
	FROM #logrecords

	DECLARE @lockinfo NVARCHAR(300);
	DECLARE @startingposition INT;
	DECLARE @endingposition INT;
	SELECT @lockinfo = REVERSE([Lock Information]), @startingposition = (CHARINDEX(':',REVERSE([Lock Information])) + 1), @endingposition = CHARINDEX(':',REVERSE([Lock Information]),(CHARINDEX(':',REVERSE([Lock Information])) + 1))
	FROM #logrecords
	WHERE Row = 2
	AND [Transaction ID] = @tranid;	

	SELECT OBJECT_NAME(REVERSE(SUBSTRING(@lockinfo,(@startingposition),(@endingposition - @startingposition)))) AS ObjectName;

	DELETE FROM #logrecords
	WHERE [Transaction ID] = @tranid;

	SELECT @loopcount += 1;

END

So far, I’ve tested the script for the following Transaction Names:

CREATE TABLE
ALTER TABLE
CREATE/ALTER VIEW

It does not work for a DROP, because the object id returned for the Lock Information column no longer exists after the DROP.

Please let me know if you have any comments or questions about the script.

NOTE: The tests that I ran selected from a transaction log containing several hundred records.  In the wild, transaction logs can contain millions of records.  This code will search the entire transaction log and find every occurrence of the Transaction Name you are looking for.  Use caution when running against a production database with a large log.

 

Identifying In-Memory Objects When Querying the Transaction Log

July 18, 2016 Leave a comment

Continuing on the theme of SQL Server 2016, my boss sent me a copy of Kalen Delaney’s (b|tSQL Server 2016 In-Memory Internals white paper.  I delved into in-memory internals when SQL Server 2014 released, but then other projects got in the way of my delving time.

I created an in-memory table to explore the contents of the in-memory log records.  To do this, I used the table-based function fn_dblog_xtp. If you are familar with fn_dblog, fn_dblog_xtp contains the same column list, with 12 new columns added. A sample SELECT statement is shown below, with the new columns highlighted:

USE yourdatabase;

SELECT
f.[Current LSN],
f.Operation,
f.Context,
f.[Transaction ID],
f.operation_desc,
f.tx_end_timestamp,
f.total_size,
f.xtp_object_id
f.newrow_identity,
f.newrow_data,
f.newrow_datasize,
f.oldrow_begin_timestamp,
f.oldrow_identity,
f.oldrow_key_data,
f.oldrow_key_datasize,
f.xtp_description,
f.[Log Record Fixed Length],
f.[Log Record Length],
f.[Flag Bits],
f.[Log Reserve],
f.[Log Record]
FROM fn_dblog_xtp(NULL,NULL)
WHERE Operation LIKE '%HK%';

The two NULL parameters being passed are the start and end Log Sequence Numbers (LSN). Passing NULLs will return all log records. The WHERE Operation LIKE ‘%HK%’ will return only log records related to in-memory tables.

Transactions against an in-memory table will return a single row in the result set from fn_dblog, while the result set from fn_dblog_xtp will contain a row for all activity. For example, if you insert 100 rows into an in-memory table, fn_dblog will contain 3 records: a BEGIN TRANSACTION, a single row for the INSERT, and a COMMIT TRANSACTION. fn_dblog_xtp will contain 102 records: a BEGIN TRANSACTION, and a row for each row inserted, and a COMMIT TRANSACTION.

One of the new columns in fn_dblog_xtp is xtp_object_id. I tried to join this to the sys.objects table to return the object name, but the values didn’t match. After banging my head against my monitor for a while, I posed the question to #sqlhelp on Twitter. Andreas Wolter (b|t) responded that a correlation can be made using DMV sys.memory_optimized_tables_internal_attributes.  Excited, I tried to join fn_dblog_xtp to the DMV, but was disappointed.

On further examiniation, I determined the xtp_object_id from fn_dblog_xtp was a very large positive number while xtp_object_id from the DMV was a very large negative number. I looked closer and found that the first in-memory object created in a database will receives two xtp_object_id values, 2147483648 and -2147483648. Both of these values are increment for additional in-memory objects. So your second in-memory object will receive values of 2147483649 and -2147483647.

So, to bring a very long story to a close, you can join fn_dblog_xtp to the DMV using the following query:

SELECT 
f.[Current LSN],
f.Operation,
f.Context,
f.[Transaction ID],
f.operation_desc,
f.tx_end_timestamp,
f.total_size,
OBJECT_NAME(m.object_id) AS ObjectName,
f.newrow_identity,
f.newrow_data,
f.newrow_datasize,
f.oldrow_begin_timestamp,
f.oldrow_identity,
f.oldrow_key_data,
f.oldrow_key_datasize,
f.xtp_description,
f.[Log Record Fixed Length],
f.[Log Record Length],
f.[Flag Bits],
f.[Log Reserve],
f.[Log Record]
FROM fn_dblog_xtp(NULL,NULL) AS f
INNER JOIN sys.memory_optimized_tables_internal_attributes m
ON (f.xtp_object_id - 2147483648) = (m.xtp_object_id + 2147483648) 
WHERE Operation LIKE '%HK%'

Once again, I hope this saves some folks frustration interrogating the transaction log for in-memory objects.

Categories: Uncategorized

Fun With READ_ONLY_ROUTING_LIST Syntax

July 13, 2016 Leave a comment

I finally am getting to work with SQL Server 2016 and spent the past two days building out an Availability Group to test the new read-only replica functionality.  This allows connections with an ApplicationIntent of ReadOnly to round-robin between all instances in the READ_ONLY_ROUTING_LIST, load balancing the read-only activity.

For my test, I built out three replicas and set all three to be readable secondaries.  Using Microsoft’s documentation on configuring read-only routing, I coded the following:

ALTER AVAILABILITY GROUP SKREEBYHA
MODIFY REPLICA ON 'AGNODE1\SKREEBYAG'
WITH
(
PRIMARY_ROLE
(
READ_ONLY_ROUTING_LIST=('AGNODE2\SKREEBYAG','AGNODE3\SKREEBYAG')
)
);

To test the new setup, I used the SQLCMD examples from Eric Russo’s blog post on Load Balancing 101.  Running the following command:

SQLCMD -S SKREEBYLIST -K ReadOnly -d testdb -Q "SELECT @@SERVERNAME"

returned AGNODE2\SKREEBYAG in each case. I could not figure out what I was doing wrong. After much frustration, I noticed the routing check query at the bottom of Eric’s post:

SELECT ar_Primary.replica_server_name 'Primary',
ar_secondary.replica_server_name 'Route_to',
ror.routing_priority 'Priority'
FROM sys.availability_read_only_routing_lists ror
INNER JOIN sys.availability_replicas ar_Primary
ON ror.replica_id = ar_Primary.replica_id
INNER JOIN sys.availability_replicas ar_secondary
ON ror.read_only_replica_id = ar_secondary.replica_id
INNER JOIN sys.availability_groups ag
ON ag.group_id = ar_Primary.group_id
WHERE ag.name = 'SKREEBYHA'
ORDER BY 1,3

Running it returned the following results:

RoutingListResults

So, in technical terms, something was screwy.  Looking at Eric’s post again, I noticed his third example for setting a routing list:

ALTER AVAILABILITY GROUP SQL2016AG
MODIFY REPLICA ON 'MyNode3'
WITH
(
PRIMARY_ROLE
(
READ_ONLY_ROUTING_LIST= (('MyNode4','MyNode1','MyNode2'))
)
)

Notice the second set of parentheses around the READ_ONLY_ROUTING_LIST value. Based on this, I changed my code to:

ALTER AVAILABILITY GROUP SKREEBYHA
MODIFY REPLICA ON 'AGNODE1\SKREEBYAG'
WITH
(
PRIMARY_ROLE
(
READ_ONLY_ROUTING_LIST=(('AGNODE2\SKREEBYAG','AGNODE3\SKREEBYAG'))
)
);

and, voila, the routing list check query returned the following:

RoutingListResultsFixed

Rerunning the SQLCMD test, the read-only connections round-robined between AGNODE2 and AGNODE3.

Many thanks to Eric Russo (b|t) for a great blog post.  I hope this saves you some frustration when working with read-only routing.

 

 

SQL Saturday Columbus

It’s been a while since my last blog post.  Since then, I’ve been to PASS Summit, which was the best one yet.  I’ve presented at SQL Saturdays in Portland, Cleveland, and Iowa City. And, most excitingly, started a new job with BlueMetal.  I am in the middle of week 3 and am really excited about the new challenge.

I’ll be presenting on Using PowerShell to Automate Your Restore Strategy at SQL Saturday Columbus on July 16th.  It will be my first time in Columbus, Ohio and I am looking forward to seeing old friends, making new ones, and teaching and learning.  You can register and find more information at the link above.  If you are in the area, don’t miss the opportunity to get a free day of training while networking with your peers in the SQL Server community.

Joining sys.dm_exec_requests to sp_whoisactive results

October 28, 2015 1 comment

Previously, I’ve blogged about returning formatted estimated_completion_time values from sys.dm_exec_requests and getting sortable output from sp_whoisactive. In this post I combine the two, joining the two result sets together. In my environment, we use Ola Hallengren’s Maintenance Solution to run our backups. Because the backup job defaults to run backups for all user databases, it can be difficult to tell which database is currently being backed up.

USE [master]
GO
 
--Drop procedure if it exists
IF  EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[sp_join_whoisactive_execrequests]') AND type in (N'P', N'PC'))
DROP PROCEDURE [dbo].sp_join_whoisactive_execrequests
GO
 
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
/* =============================================
-- Author:      Frank Gill
-- Create date: 2015-10-27
-- Description: This procedure executes Adam Machanic's sp_whoisactive, dumps the results to a temp table, and then joins those results to 
-- sys.dm_exec_requests.  This will return estimated completion time for the following commands along with the statement being executed
-- in a single pass:
-- ALTER INDEX REORGANIZE
-- AUTO_SHRINK option with ALTER DATABASE
-- BACKUP DATABASE
-- DBCC CHECKDB
-- DBCC CHECKFILEGROUP
-- DBCC CHECKTABLE
-- DBCC INDEXDEFRAG
-- DBCC SHRINKDATABASE
-- DBCC SHRINKFILE
-- RECOVERY
-- RESTORE DATABASE,
-- ROLLBACK
-- TDE ENCRYPTION
-- ============================================= */
CREATE PROCEDURE sp_join_whoisactive_execrequests
AS
BEGIN
 
	IF OBJECT_ID('tempdb..#WhoIsActive') IS NOT NULL 
	BEGIN
		SELECT 'Dropping'
		DROP TABLE #WhoIsActive
	END
 
	CREATE TABLE #WhoIsActive
	([dd hh:mm:ss.mss] VARCHAR(20)
	,[dd hh:mm:ss.mss (avg)] VARCHAR(20)
	,[session_id] SMALLINT
	,[sql_text] XML
	,[sql_command] XML
	,[login_name] SYSNAME
	,[wait_info] NVARCHAR(4000)
	,[tran_log_writes] NVARCHAR(4000)
	,[CPU] VARCHAR(30)
	,[tempdb_allocations] VARCHAR(30)
	,[tempdb_current] VARCHAR(30)
	,[blocking_session_id] SMALLINT
	,[blocked_session_count] VARCHAR(30)
	,[reads] VARCHAR(30)
	,[writes] VARCHAR(30)
	,[physical_reads] VARCHAR(30)
	,[query_plan] XML
	,[used_memory] VARCHAR(30)
	,[status] VARCHAR(30)
	,[tran_start_time] DATETIME
	,[open_tran_count] VARCHAR(30)
	,[percent_complete] VARCHAR(30)
	,[host_name] SYSNAME
	,[database_name] SYSNAME
	,[program_name] SYSNAME
	,[start_time] DATETIME
	,[login_time] DATETIME
	,[request_id] INT
	,[collection_time] DATETIME)

	/* Execute sp_whoisactive and write the result set to the temp table created above */
	EXEC master.dbo.sp_WhoIsActive
	@get_plans = 2, 
	@get_outer_command = 1, 
	@get_transaction_info = 1, 
	@get_avg_time = 1, 
	@find_block_leaders = 1,
	@destination_table = #WhoIsActive

	/* Join the #whoisactive temp table to sys.dm_exec_requests to get estimated completion time and query information in one pass */ 
	SELECT CASE WHEN ((r.estimated_completion_time/1000)%3600/60) < 10 THEN '0' +
	CONVERT(VARCHAR(10),(r.estimated_completion_time/1000)%3600/60) 
	ELSE CONVERT(VARCHAR(10),(r.estimated_completion_time/1000)%3600/60)
	END  + ':' + 
	CASE WHEN ((r.estimated_completion_time/1000)%60) < 10 THEN '0' +
	CONVERT(VARCHAR(10),(r.estimated_completion_time/1000)%60)
	ELSE CONVERT(VARCHAR(10),(r.estimated_completion_time/1000)%60)
	END
	AS [Time Remaining],
	r.percent_complete,
	r.session_id,
	w.login_name,
	w.[host_name],
	w.sql_command,
	w.sql_text 
	FROM #WhoIsActive w
	RIGHT OUTER JOIN sys.dm_exec_requests r
	ON r.session_id = w.session_id
	WHERE r.percent_complete > 0;
 
END

This procedure takes the output from sp_whoisactive and joins it to sys.dm_exec_requests on session_id, returning the estimated completion time and current backup statement in a single pass. Here is a sample result set from the procedure (Click to Enlarge):

SpWhoIsActiveExecRequestsResults

The sql_command column contains the full command being run, in this example Ola Hallengren’s DatabaseBackup procedure. The sql_text column contains the actual SQL statement being run, BACKUP DATABASE [AdventureWorks2012] TO DISK…. The DatabaseBackup procedure runs database backups in alphabetical order based on the database name, so this allows tracking a job progress.

Many thanks to Adam Machanic (b|t) for sp_whoisactive, Ola Hallengren (b|t) for his Maintenance Solution, and Aaron Bertrand (b|t) for his advice on formatting the estimated completion time more elegantly. I finally had an opportunity to use it.

I hope you can put this procedure to good use. Let me know if you have any questions.

SQL Saturday #394 – Iowa City

SQL Saturday Iowa City is coming up Saturday, May 30th.  I will be there presenting How to Identify What Data is Corrupt at 1pm.  It will be my third year in Iowa City and it is always a wonderful time.  You can find more information and register for the event here.  If you’ve never been to a SQL Saturday, it is a wonderful opportunity to get a free days of training and network with your fellow SQL Server professionals.

Categories: Uncategorized

Generate ALTER Statements for Database Moves

October 13, 2014 1 comment

Last week, I posted Identifying Corrupt Rows USING DBCC CHECKDB and DBCC PAGE. I wrote the scripts in that post to identify corrupt rows in a client’s database. As we continued to investigate, things got strange. Repeated runs of DBCC CHECKDB were generating different results. Each one showed serious corruption, but on different pages with each run. In an effort to remove the storage system from the list of potential causes, I needed to move to data and log files for the database to a a different storage array. This post from TechNet gave me the steps I needed to run.

In this case, only one database had to be moved. To move more than one database, I wrote the following script to generate the statements specified in the TechNet article. In addition to the ALTER DATABASE statements, the script checks to see if the database is part of an availability group. If it is, a statement is generated to remove it. As adding a database to an availability group is far more complicated than removing it, I will leave that to the user.

As usual, I hope you find this useful. And remember, executing code you find on the internet against your production instance always has the potential to become a resume updating event. Use caution and test.

/*---------------------------------------------------------------
Created By - Frank Gill
Created On - 2014-10-13
 
Script to generate ALTER DATABASE statement to move a database to
a different storage location
---------------------------------------------------------------*/

USE master;

SET NOCOUNT ON;

/* Drop temp table if it exists */

IF OBJECT_ID('tempdb..#dbfiles') IS NOT NULL
BEGIN

	DROP TABLE #dbfiles;

END

/* Declare local variables and create temp table */
DECLARE @dbname SYSNAME;
DECLARE @agname SYSNAME;
DECLARE @sqlstr NVARCHAR(4000);
DECLARE @physicalname NVARCHAR(260);
DECLARE @logicalname SYSNAME;
DECLARE @filetype TINYINT;
DECLARE @datapath NVARCHAR(1000);
DECLARE @logpath NVARCHAR(1000);
DECLARE @agdb BIT = 0;
DECLARE @loopcount INT = 1;
DECLARE @looplimit INT;

CREATE TABLE #dbfiles
(logicalname SYSNAME
,physicalname NVARCHAR(260)
,filetype TINYINT)

/* Initialize variables */
SET @dbname = 'Your_Database';
SET @datapath = 'Your_Data_Path';
SET @logpath = 'Your_Log_Path';

/* If the database is part of an availability group, generate a statement to remove it prior to taking the database offline */
IF(SELECT replica_ID FROM sys.databases WHERE name = @dbname) IS NOT NULL
BEGIN

	PRINT '/* This database is part of an availability group and must be removed prior to taking the database offline
   You will need to add the database back to the availability group after the database files are moved */'

	SELECT @agname = g.name FROM sys.databases d
	INNER JOIN sys.availability_replicas r
	ON d.replica_id = r.replica_id
	INNER JOIN sys.availability_groups g
	ON g.group_id = r.group_id
	WHERE d.name = @dbname;

	SET @sqlstr = 'ALTER AVAILABILITY GROUP [' + @agname + ']
REMOVE DATABASE [' + @dbname + '];';

	PRINT @sqlstr;
	
	SET @agdb = 1;

END

/* Generate a statement to set the database offline */
SET @sqlstr = 'ALTER DATABASE ' + @dbname + '
SET OFFLINE WITH ROLLBACK IMMEDIATE';

PRINT @sqlstr;

/* Get a list of database files for your database and insert them into the temp table for use in the loop */
SET @sqlstr = 'INSERT INTO #dbfiles
SELECT name, physical_name, type FROM ' + @dbname + '.sys.database_files;'

EXEC sp_executesql @sqlstr;

/* Set the loop limit to the number of files returned from the insert statement */
SET @looplimit = @@ROWCOUNT;

WHILE @loopcount &lt;= @looplimit
BEGIN

	/* Get the first set of physical and logical file name and generate an ALTER DATABASE statement using the file type to determine the new physical location */

	SELECT TOP 1 @logicalname = logicalname, @physicalname =  REVERSE(SUBSTRING(REVERSE(physicalname),1,(CHARINDEX('\',REVERSE(physicalname))-1))), @filetype = filetype FROM #dbfiles;

	IF @filetype = 0
	BEGIN

 SET @sqlstr = 'ALTER DATABASE ' + @dbname + '
MODIFY FILE 
(NAME = ' + @logicalname + ' 
,FILENAME = ''' + @datapath + @physicalname + '''' + ');';
 
 END
 ELSE IF @filetype = 1
 BEGIN

 SET @sqlstr = 'ALTER DATABASE ' + @dbname + '
MODIFY FILE 
(NAME = ' + @logicalname + ' 
,FILENAME = ''' + @logpath + @physicalname + '''' + ');';
 END

	PRINT @sqlstr;

	SET @loopcount += 1;

	DELETE TOP (1) FROM #dbfiles 

END

/* Generate a statement to bring the database back online */
SET @sqlstr = 'ALTER DATABASE ' + @dbname + '
SET ONLINE';

PRINT @sqlstr;


IF @agdb = 1
BEGIN

	PRINT '/* Reminder!  ' + @dbname + 'is part of an availability group 
You will need to add the database back to the availability group if necessary */'

END