Introduction
Sometimes you face interesting challenges with unusual environment. One of my customer needed a automated and flexible backup solution. Said like that nothing very complex you will say. But if I mention that some databases were 60TB big with more than 30 filegroups and around 600 database data files each and moreover synchronized in an AlwayOn availability group, it is not the same story and you can easily imagine that working with standard backup strategy will not be viable. Therefore I was working on implementing solution using partial full, partial differential and read-only filegroups backups to minimize the time needed.
Well this post is not explaining the whole solution, but only a way to collect the last backup information of my databases, especially for the ones being in an AlwaysOn availability group and which filegroup states changed.
If you already worked with partial backups and read-only filegroups backups you know that the backup sequence is very important, but if you don’t you will quickly notice it if you need to restore, and you can easily understand why this last backup information is crucial. As the backups always have to run on the primary replica, you have to collect the information on all replicas if failover occurred and the primary changed to ensure that you execute the right backups at the right moment and not make unnecessary backups (remember the data volumes).
Explanation of the solution and code
Another thing to mentioned, because of security policies, it was forbidden to use linked server, but hopefully xp_CmdShell was possible. I wanted each replica to work independently, and needed a way to query the remote replicas to collect the last backup information on each SQL Server instances involved. Because backup history might be cleans, I need to store this information in local tables. I created 2 tables, one to stored last database backups information and the other to store last read-only filegroup backups information. Additionally I created 2 tables to collect temporarily the information coming from all replicas.
Creation of the last backup information tables:
--########################################################
--###Backup generator - backup last date info temporary table
--########################################################
USE [<YourDatabaseName>]
GO
/*
if OBJECT_ID('[dbo].[bakgen_backuplastdt_databases_temp]') is not null
drop table [dbo].[bakgen_backuplastdt_databases_temp]
*/
create table [dbo].[bakgen_backuplastdt_databases_temp] (
ServerName sysname not null,
SqlInstanceName sysname not null,
SqlServerName sysname not null,
DatabaseCreationDate datetime not null,
DatabaseName sysname not null,
BackupType char(1) not null,
LastBackupDate datetime not null,
LastBackupSize numeric(20,0) not null,
is_primary bit null,
insertdate datetime not null
)
GO
create unique clustered index idx_bakgen_backuplastdt_databases_temp on [dbo].[bakgen_backuplastdt_databases_temp](DatabaseCreationDate,DatabaseName,BackupType,ServerName,SqlInstanceName)
--########################################################
--###Backup generator - backup last date info
--########################################################
USE [<YourDatabaseName>]
GO
/*
if OBJECT_ID('[dbo].[bakgen_backuplastdt_databases]') is not null
drop table [dbo].[bakgen_backuplastdt_databases]
*/
create table [dbo].[bakgen_backuplastdt_databases] (
ServerName sysname not null,
SqlInstanceName sysname not null,
SqlServerName sysname not null,
DatabaseCreationDate datetime not null,
DatabaseName sysname not null,
BackupType char(1) not null,
LastBackupDate datetime not null,
LastBackupSize numeric(20,0) not null,
is_primary bit null,
insertdate datetime not null
)
GO
create unique clustered index idx_bakgen_backuplastdt_databases on [dbo].[bakgen_backuplastdt_databases](DatabaseCreationDate,DatabaseName,BackupType,ServerName,SqlInstanceName)
I finally decided to work with a stored procedure calling a PowerShell scripts to remotely execute the queries on the replicas.
The stored procedure lists the existing replicas and collects the last database backup information, then the read-only filegroup backup information creating 2 different queries to execute locally on the server and store the data in the temp tables first. It will create similar queries, excluding the databases not involved in availability groups and execute them on the remote replicas using xp_CmdShell running PowerShell scripts. The PowerShell scripts are dynamically created using the TSQL queries generated. They used one function of the well-known DBATools. So you will have to install it first.
You will notice that in order to log the scripts generated are nicely formatted in order to read and debug them easier. But before executing you PowerShell script through xp_CmdShell you need to apply some string formatting like the 2 lines I added to avoid the execution to fail:
set @PSCmd = replace(replace(@PSCmd, nchar(13), N”), nchar(10), N’ ‘)
set @PSCmd = replace(@PSCmd, ‘>’, N’^>’)
Do not forget to escape some characters, otherwise the execution will fails, in my case omitting to escape the ‘>’ sign raise an “Access is denied” message in the output of the xp_CmdShell execution.
After that the code is comparing what has been collected in the temp tables with the final information and update information if needed.
Here is the complete code of the stored procedure:
use [<YourDatabaseName>]
if OBJECT_ID('dbo.bakgen_p_getbakinfo') is not null
drop procedure dbo.bakgen_p_getbakinfo
go
CREATE PROCEDURE dbo.bakgen_p_getbakinfo
AS
/************************************
* dbi-services SA, Switzerland *
* http://www.dbi-services.com *
*************************************
Group/Privileges..: DBA
Script Name......: bakgen_p_getbakinfo.sql
Author...........: Christophe Cosme
Date.............: 2019-09-20
Version..........: SQL Server 2016 / 2017
Description......: Get the backup information locally but also on the replica involved
Input parameters.:
Output parameter:
************************************************************************************************
Historical
Date Version Who Whats Comments
---------- ------- --- -------- -----------------------------------------------------
2019-09-30 1.0 CHC Creation
************************************************************************************************/
BEGIN
BEGIN TRY
set nocount on
declare
@ErrorMessage NVARCHAR(4000),
@ErrorSeverity INT,
@ErrorState INT;
declare @ModuleName sysname,
@ProcName sysname,
@InfoLog nvarchar(max),
@Execute char(1)
set @ModuleName = 'BakGen'
set @ProcName = OBJECT_NAME(@@PROCID)
set @Execute = 'A'
set @InfoLog = 'Retrieve backup information'
execute dbo.bakgen_p_log
@ModuleName = @ModuleName,
@ProcedureName = @ProcName,
@ExecuteMode = @Execute,
@LogType = 'INFO',
@DatabaseName = null,
@Information = @InfoLog,
@Script = null
--###variable to store error message
declare @errmsg varchar(4000)
--###variable with the current datetime
declare @cdt datetime = getdate()
--###variabler to store the sql and powershell commands to execute
declare @sqllocalDB nvarchar(4000),
@sqllocalFG nvarchar(4000),
@sqlremoteDB nvarchar(4000),
@sqlremoteFG nvarchar(4000),
@PSCmd nvarchar(4000)
--###variable to store the local SQL server name
declare @LocalSqlServerName sysname
--###variable to store the list of replicas
declare @TAgReplica table (AgReplicaName sysname)
--###variable for the cursors
declare @AgReplicaName sysname
--###set the local SQL Server name
set @LocalSqlServerName = lower(convert(sysname,serverproperty('ServerName')))
--############################################################################
--### check if tables exist
--############################################################################
if object_id('[dbo].[bakgen_backuplastdt_databases_temp]') is null
begin
set @errmsg = 'Get Backup info : table not found'
set @errmsg += ' table name = [dbo].[bakgen_backuplastdt_databases_temp]'
raiserror (@errmsg,11,1);
end
if object_id('[dbo].[bakgen_backuplastdt_fgreadonly_temp]') is null
begin
set @errmsg = 'Get Backup info : table not found'
set @errmsg += ' table name = [dbo].[bakgen_backuplastdt_fgreadonly_temp]'
raiserror (@errmsg,11,1);
end
if object_id('[dbo].[bakgen_backuplastdt_databases]') is null
begin
set @errmsg = 'Get Backup info : table not found'
set @errmsg += ' table name = [dbo].[bakgen_backuplastdt_databases]'
raiserror (@errmsg,11,1);
end
if object_id('[dbo].[bakgen_backuplastdt_fgreadonly]') is null
begin
set @errmsg = 'Get Backup info : table not found'
set @errmsg += ' table name = [dbo].[bakgen_backuplastdt_fgreadonly]'
raiserror (@errmsg,11,1);
end
--############################################################################
--### select the replicas involved adding first the local server
--############################################################################
insert into @TAgReplica (AgReplicaName ) select @LocalSqlServerName
--###check if alwayson feature is activated
if (serverproperty('IsHadrEnabled') = 1)
begin
insert into @TAgReplica (AgReplicaName )
select lower(agr.replica_server_name) from sys.availability_replicas agr
where agr.replica_server_name <> @LocalSqlServerName
end
--############################################################################
--### construct the SQL command to execute on the local SQL Server
--############################################################################
set @sqllocalDB = ''
set @sqllocalDB +='
declare @Tbi table (
ServerName sysname,
SqlInstanceName sysname,
SqlServerName sysname,
DatabaseCreationDate datetime,
DatabaseName sysname,
BackupType char(1),
LastBackupDate datetime,
is_primary bit null,
insertdate datetime
)
insert into @Tbi (
[ServerName],
[SqlInstanceName],
[SqlServerName],
[DatabaseCreationDate],
[DatabaseName],
[BackupType],
[LastBackupDate],
[is_primary],
[insertdate])
select
lower(convert(sysname,serverproperty(''machinename''))) as ServerName,
lower(convert(sysname,serverproperty(''InstanceName''))) as SqlInstanceName,
lower(convert(sysname,serverproperty(''ServerName''))) as SqlServerName,
db.create_date as DatabaseCreationDate,
bs.database_name as DatabaseName,
bs.type as BackupType,
max(bs.backup_finish_date) as LastBackupDate,
sys.fn_hadr_is_primary_replica(bs.database_name) as is_primary,
''' + convert(varchar,@cdt,120) + '''
from msdb.dbo.backupset bs
inner join sys.databases db on db.name = bs.database_name
where bs.type in (''D'',''I'',''P'',''Q'')
and bs.is_copy_only = 0
and coalesce(sys.fn_hadr_is_primary_replica(bs.database_name),-1) in (-1,0,1)
group by
db.create_date,
bs.database_name,
bs.type,
sys.fn_hadr_is_primary_replica(bs.database_name)
insert into [dbo].[bakgen_backuplastdt_databases_temp] (
[ServerName],
[SqlInstanceName],
[SqlServerName],
[DatabaseCreationDate],
[DatabaseName],
[BackupType],
[LastBackupDate],
[LastBackupSize],
[is_primary],
[insertdate])
select
t.[ServerName],
t.[SqlInstanceName],
t.[SqlServerName],
t.[DatabaseCreationDate],
t.[DatabaseName],
t.[BackupType],
t.[LastBackupDate],
bs.[backup_size],
t.[is_primary],
t.[insertdate]
from @Tbi t
inner join msdb.dbo.backupset bs on
bs.backup_finish_date = t.LastBackupDate
and bs.database_name collate database_default = t.DatabaseName collate database_default
and bs.type collate database_default = t.BackupType collate database_default
'
set @sqllocalFG = ''
set @sqllocalFG +='
insert into [dbo].[bakgen_backuplastdt_fgreadonly_temp]
([ServerName],
[SqlInstanceName],
[SqlServerName],
[DatabaseCreationDate],
[DatabaseName],
[BackupType],
[filegroup_name],
[file_logicalname],
[filegroup_guid],
[file_guid],
[LastBackupDate],
[LastBackupReadOnlyLsn],
[is_primary],
[insertdate])
select
lower(convert(sysname,serverproperty(''machinename''))) as ServerName,
lower(convert(sysname,serverproperty(''InstanceName''))) as SqlInstanceName,
lower(convert(sysname,serverproperty(''ServerName''))) as SqlServerName,
db.create_date as DatabaseCreationDate,
bs.database_name as DatabaseName,
bs.type as BackupType,
bf.filegroup_name,
bf.logical_name as file_logicalname,
bf.filegroup_guid,
bf.file_guid,
max(bs.backup_finish_date) as LastBackupDate,
max(bf.read_only_lsn) as LastBackupReadOnlyLsn,
sys.fn_hadr_is_primary_replica(bs.database_name) as is_primary,
''' + convert(varchar,@cdt,120) + '''
from msdb.dbo.backupset bs
inner join msdb.dbo.backupfile bf on bf.backup_set_id = bs.backup_set_id
inner join sys.databases db on db.name = bs.database_name
where
bs.backup_finish_date >= db.create_date
and bs.type in (''F'')
and bs.is_copy_only = 0
and coalesce(sys.fn_hadr_is_primary_replica(bs.database_name),-1) in (-1,0,1)
and bf.is_present = 1
and bf.is_readonly = 1
and bf.file_type = ''D''
group by
db.create_date,
bs.database_name,
bs.type,
bf.filegroup_name,
bf.logical_name,
bf.filegroup_guid,
bf.file_guid,
sys.fn_hadr_is_primary_replica(bs.database_name)
'
--############################################################################
--### construct the SQL command to execute on the remote SQL Server
--############################################################################
set @sqlremoteDB = ''
set @sqlremoteDB +='
declare @Tbi table (
ServerName sysname,
SqlInstanceName sysname,
SqlServerName sysname,
DatabaseCreationDate datetime,
DatabaseName sysname,
BackupType char(1),
LastBackupDate datetime,
is_primary bit null,
insertdate datetime
)
insert into @Tbi (
[ServerName],
[SqlInstanceName],
[SqlServerName],
[DatabaseCreationDate],
[DatabaseName],
[BackupType],
[LastBackupDate],
[is_primary],
[insertdate])
select
lower(convert(sysname,serverproperty(''machinename''))) as ServerName,
lower(convert(sysname,serverproperty(''InstanceName''))) as SqlInstanceName,
lower(convert(sysname,serverproperty(''ServerName''))) as SqlServerName,
db.create_date as DatabaseCreationDate,
bs.database_name as DatabaseName,
bs.type as BackupType,
max(bs.backup_finish_date) as LastBackupDate,
sys.fn_hadr_is_primary_replica(bs.database_name) as is_primary,
''' + convert(varchar,@cdt,120) + '''
from msdb.dbo.backupset bs
inner join sys.databases db on db.name = bs.database_name
where bs.type in (''D'',''I'',''P'',''Q'')
and bs.is_copy_only = 0
and coalesce(sys.fn_hadr_is_primary_replica(bs.database_name),-1) in (0,1)
group by
db.create_date,
bs.database_name,
bs.type,
sys.fn_hadr_is_primary_replica(bs.database_name)
select
t.[ServerName],
t.[SqlInstanceName],
t.[SqlServerName],
t.[DatabaseCreationDate],
t.[DatabaseName],
t.[BackupType],
t.[LastBackupDate],
bs.[backup_size],
t.[is_primary],
t.[insertdate]
from @Tbi t
inner join msdb.dbo.backupset bs on
bs.backup_finish_date = t.LastBackupDate
and bs.database_name collate database_default = t.DatabaseName collate database_default
and bs.type collate database_default = t.BackupType collate database_default
'
set @sqlremoteFG = ''
set @sqlremoteFG +='
select
lower(convert(sysname,serverproperty(''machinename''))) as ServerName,
lower(convert(sysname,serverproperty(''InstanceName''))) as SqlInstanceName,
lower(convert(sysname,serverproperty(''ServerName''))) as SqlServerName,
db.create_date as DatabaseCreationDate,
bs.database_name as DatabaseName,
bs.type as BackupType,
bf.filegroup_name,
bf.logical_name as file_logicalname,
bf.filegroup_guid,
bf.file_guid,
max(bs.backup_finish_date) as LastBackupDate,
max(bf.read_only_lsn) as LastReadOnlyLsn,
sys.fn_hadr_is_primary_replica(bs.database_name) as is_primary,
''' + convert(varchar,@cdt,120) + '''
from msdb.dbo.backupset bs
inner join msdb.dbo.backupfile bf on bf.backup_set_id = bs.backup_set_id
inner join sys.databases db on db.name = bs.database_name
where
bs.backup_finish_date >= db.create_date
and bs.type in (''F'')
and bs.is_copy_only = 0
and coalesce(sys.fn_hadr_is_primary_replica(bs.database_name),-1) in (0,1)
and bf.is_present = 1
and bf.is_readonly = 1
and bf.file_type = ''D''
group by
db.create_date,
bs.database_name,
bs.type,
bf.filegroup_name,
bf.logical_name,
bf.filegroup_guid,
bf.file_guid,
sys.fn_hadr_is_primary_replica(bs.database_name)
'
--############################################################################
--### delete all records in the backup info tables
--############################################################################
delete from [dbo].[bakgen_backuplastdt_databases_temp]
delete from [dbo].[bakgen_backuplastdt_fgreadonly_temp]
--############################################################################
--### loop for all replicas involved
--############################################################################
declare cur_replica cursor
static local forward_only
for
select AgReplicaName
from @TAgReplica
open cur_replica
fetch next from cur_replica into
@AgReplicaName
while @@fetch_status = 0
begin
if @LocalSqlServerName = @AgReplicaName
begin
set @InfoLog = 'Get database backup information on local SQL Server instance ' + QUOTENAME(@AgReplicaName)
execute dbo.bakgen_p_log
@ModuleName = @ModuleName,
@ProcedureName = @ProcName,
@ExecuteMode = @Execute,
@LogType = 'INFO',
@DatabaseName = null,
@Information = @InfoLog,
@Script = @sqllocalDB
execute sp_executesql @sqllocalDB
set @InfoLog = 'Get read-only filegroup backup information on local SQL Server instance ' + QUOTENAME(@AgReplicaName)
execute dbo.bakgen_p_log
@ModuleName = @ModuleName,
@ProcedureName = @ProcName,
@ExecuteMode = @Execute,
@LogType = 'INFO',
@DatabaseName = null,
@Information = @InfoLog,
@Script = @sqllocalFG
execute sp_executesql @sqllocalFG
end
else
begin
--############################################################################
--### construct the PowerShell command to execute on the remote SQL Server
--############################################################################
set @PSCmd = ''
set @PSCmd += 'PowerShell.exe '
set @PSCmd += '-Command "'
set @PSCmd += '$qrydb = \"' + @sqlremoteDB + '\"; '
set @PSCmd += '$qryfg = \"' + @sqlremoteFG + '\"; '
set @PSCmd += '$rdb = Invoke-DbaQuery -SqlInstance ' + @AgReplicaName + ' -Query $qrydb; '
set @PSCmd += '$rfg = Invoke-DbaQuery -SqlInstance ' + @AgReplicaName + ' -Query $qryfg; '
set @PSCmd += 'if ($rdb -ne $null) { '
set @PSCmd += 'Write-DbaDbTableData -SqlInstance ' + @LocalSqlServerName + ' -Database ' + db_name() + ' -Schema dbo -Table bakgen_backuplastdt_databases_temp -InputObject $rdb;'
set @PSCmd += '} '
set @PSCmd += 'if ($rfg -ne $null) { '
set @PSCmd += 'Write-DbaDbTableData -SqlInstance ' + @LocalSqlServerName + ' -Database ' + db_name() + ' -Schema dbo -Table bakgen_backuplastdt_fgreadonly_temp -InputObject $rfg;'
set @PSCmd += '} '
set @PSCmd += '"'
set @InfoLog = 'Get backup information on replica SQL Server instance ' + QUOTENAME(@AgReplicaName) + ' executing master..xp_cmdshell PowerShell script'
execute dbo.bakgen_p_log
@ModuleName = @ModuleName,
@ProcedureName = @ProcName,
@ExecuteMode = @Execute,
@LogType = 'INFO',
@DatabaseName = null,
@Information = @InfoLog,
@Script = @PSCmd
--###remove CRLF for xp_cmdshell and PowerShell
set @PSCmd = replace(replace(@PSCmd, nchar(13), N''), nchar(10), N' ')
set @PSCmd = replace(@PSCmd, '>', N'^>')
--###Execute the powershell command on the replica and store the result in the temporary tables
exec master..xp_cmdshell @PSCmd
end
fetch next from cur_replica into
@AgReplicaName
end
close cur_replica
deallocate cur_replica
--############################################################################
--### Update and insert backup information in final tables
--############################################################################
BEGIN TRY
begin transaction
delete f
from [dbo].[bakgen_backuplastdt_databases_temp] t
inner join [dbo].[bakgen_backuplastdt_databases] f
on f.DatabaseCreationDate = t.DatabaseCreationDate
and f.DatabaseName = t.DatabaseName
and f.BackupType = t.BackupType
and f.ServerName = t.ServerName
and t.SqlInstanceName = f.SqlInstanceName
where f.LastBackupDate < t.LastBackupDate
Insert into [dbo].[bakgen_backuplastdt_databases] (
ServerName,
SqlInstanceName,
SqlServerName,
DatabaseCreationDate,
DatabaseName,
BackupType,
LastBackupDate,
LastBackupSize,
is_primary,
insertdate
)
select
t.ServerName,
t.SqlInstanceName,
t.SqlServerName,
t.DatabaseCreationDate,
t.DatabaseName,
t.BackupType,
t.LastBackupDate,
t.LastBackupSize,
t.is_primary,
t.insertdate
from [dbo].[bakgen_backuplastdt_databases_temp] t
where not exists (select 1 from [dbo].[bakgen_backuplastdt_databases] f
where f.DatabaseName = t.DatabaseName
and f.BackupType = t.BackupType
and f.ServerName = t.ServerName
and t.SqlInstanceName = f.SqlInstanceName)
commit
begin transaction
delete f
from [dbo].[bakgen_backuplastdt_fgreadonly_temp] t
inner join [dbo].[bakgen_backuplastdt_fgreadonly] f
on f.DatabaseName = t.DatabaseName
and f.BackupType = t.BackupType
and f.filegroup_name = t.filegroup_name
and f.ServerName = t.ServerName
and f.SqlInstanceName = t.SqlInstanceName
where f.LastBackupDate < t.LastBackupDate
Insert into [dbo].[bakgen_backuplastdt_fgreadonly] (
ServerName,
SqlInstanceName,
SqlServerName,
DatabaseCreationDate,
DatabaseName,
BackupType,
filegroup_name,
file_logicalname,
filegroup_guid,
file_guid,
LastBackupDate,
LastBackupReadOnlyLsn,
is_primary,
insertdate
)
select
t.ServerName,
t.SqlInstanceName,
t.SqlServerName,
t.DatabaseCreationDate,
t.DatabaseName,
t.BackupType,
t.filegroup_name,
t.file_logicalname,
t.filegroup_guid,
t.file_guid,
t.LastBackupDate,
t.LastBackupReadOnlyLsn,
t.is_primary,
t.insertdate
from [dbo].[bakgen_backuplastdt_fgreadonly_temp] t
where not exists (
select 1 from [dbo].[bakgen_backuplastdt_fgreadonly] f
where f.DatabaseName = t.DatabaseName
and f.BackupType = t.BackupType
and f.filegroup_name = t.filegroup_name
and f.ServerName = t.ServerName
and t.SqlInstanceName = f.SqlInstanceName)
commit
END TRY
BEGIN CATCH
SELECT
@ErrorMessage = ERROR_MESSAGE(),
@ErrorSeverity = ERROR_SEVERITY(),
@ErrorState = ERROR_STATE();
IF @@TRANCOUNT > 0
ROLLBACK
raiserror(@ErrorMessage, @ErrorSeverity, @ErrorState);
END CATCH
RETURN;
END TRY
BEGIN CATCH
SELECT
@ErrorMessage = ERROR_MESSAGE(),
@ErrorSeverity = ERROR_SEVERITY(),
@ErrorState = ERROR_STATE();
set @InfoLog = '@ErrorState = ' + convert(nvarchar, @ErrorState) + '/@ErrorSeverity = ' + convert(nvarchar, @ErrorSeverity) + '/@ErrorMessage = ' + @ErrorMessage
execute dbo.bakgen_p_log
@ModuleName = @ModuleName,
@ProcedureName = @ProcName,
@ExecuteMode = @Execute,
@LogType = 'ERROR',
@DatabaseName = null,
@Information = @InfoLog,
@Script = null
raiserror(@ErrorMessage, @ErrorSeverity, @ErrorState);
END CATCH;
RETURN
END
Other Objects needed
As mentioned above I used the DBATools Write-DbaDbTableData function, so need to install it before being able to run the above stored procedure.
I share also the 2 other objects used in the above stored procedure, but of course you can adapt the code to your needs
Creation of the log table:
--########################################################
--###Backup generator - logs
--########################################################
USE [<YourDatabaseName>]
GO
/*
if OBJECT_ID('[dbo].[bakgen_logs]') is not null
drop table [dbo].[bakgen_logs]
*/
create table [dbo].[bakgen_logs] (
id bigint identity(1,1) not null,
LogDate datetime,
SqlServerName sysname,
ModuleName sysname,
ProcedureName sysname,
ExecuteMode char(1),
LogType nvarchar(50),
DatabaseName sysname null,
Information nvarchar(max) null,
Scripts nvarchar(max) null,
CONSTRAINT [PK_bakgen_logs] PRIMARY KEY CLUSTERED
(
[id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
)
GO
Creation of the stored procedure to write the logs:
use [<YourDatabaseName>]
if OBJECT_ID('dbo.bakgen_p_log') is not null
drop procedure dbo.bakgen_p_log
go
CREATE PROCEDURE dbo.bakgen_p_log
(
@ModuleName sysname,
@ProcedureName sysname,
@ExecuteMode char(1),
@LogType nvarchar(50),
@DatabaseName sysname = null,
@Information nvarchar(max) = null,
@Script nvarchar(max) = null
)
AS
/************************************
* dbi-services SA, Switzerland *
* http://www.dbi-services.com *
*************************************
Group/Privileges..: DBA
Script Name......: bakgen_p_log.sql
Author...........: Christophe Cosme
Date.............: 2019-09-20
Version..........: SQL Server 2016 / 2017
Description......: write information to the log table to keep trace of the step executed
Input parameters.:
Output parameter:
************************************************************************************************
Historical
Date Version Who Whats Comments
---------- ------- --- -------- -----------------------------------------------------
2019-10-14 1.0 CHC Creation
************************************************************************************************/
BEGIN
BEGIN TRY
--###variable to store error message
declare @errmsg varchar(4000)
if OBJECT_ID('[dbo].[bakgen_logs]') is null
begin
set @errmsg = 'bakgen_p_log : table not found - be sure the table exists'
set @errmsg += ' table name = [dbo].[bakgen_logs]'
raiserror (@errmsg,11,1);
end
insert into [dbo].[bakgen_logs] (
LogDate,
SqlServerName,
ModuleName,
ProcedureName,
ExecuteMode,
LogType,
DatabaseName,
Information,
Scripts
)
values(
getdate(),
convert(sysname,SERVERPROPERTY('servername')),
@ModuleName,
@ProcedureName,
@ExecuteMode,
@LogType,
@DatabaseName,
@Information,
@Script
)
RETURN;
END TRY
BEGIN CATCH
declare
@ErrorMessage NVARCHAR(4000),
@ErrorSeverity INT,
@ErrorState INT;
SELECT
@ErrorMessage = ERROR_MESSAGE(),
@ErrorSeverity = ERROR_SEVERITY(),
@ErrorState = ERROR_STATE();
-- return the error inside the CATCH block
raiserror(@ErrorMessage, @ErrorSeverity, @ErrorState);
END CATCH;
RETURN
END
Conclusion
Triggering PowerShell from a stored procedure did the trick for my special case and is very practical. But to find the right syntax to make the script running through xp_CmdShell was not so trivial. I admit to spend sometimes to figure out what was causing the issue.
But I definitely enjoyed the solution for retrieving information outside the local SQL Server instance.
Cet article SQL Server – Collecting last backup information in an AlwaysOn environment est apparu en premier sur Blog dbi services.