我有一个通过powershell进行SQL Server数据库备份的进程，该进程在迭代数据库时会记录到单个文本文件中。当我们收到错误时，我想将它们记录到表中，但是本机T-SQL会阻止在Try-Catch块中获取备份错误消息，所以我想从文本文件中提取这些信息。
我只想从最新的数据库中获取消息。因此，我的问题。
鉴于以下文字样本：
12:31:32.310 #############
12:31:32.326 # Database1 #
12:31:32.326 #############
DBCC execution completed. If DBCC printed error messages, contact your system administrator.
Msg 5901, Level 16, State 1, Server Server1, Line 1
One or more recovery units belonging to database 'Database1' failed to generate a checkpoint. This is typically caused by lack of system resources such as disk or memory, or in some cases due to database corruption. Examine previous entries in the error log for more detailed information on this failure.
Msg 9002, Level 17, State 4, Server Server1, Line 1
The transaction log for database 'Database1' is full due to 'ACTIVE_TRANSACTION'.
Msg 3013, Level 16, State 1, Server Server1, Line 1
BACKUP DATABASE is terminating abnormally.
Msg 3201, Level 16, State 2, Server Server1, Line 4
Cannot open backup device 'D:\Backups\Database1\Database1_201408260031_backup_Native_DIFF.bak'. Operating system error 2(The system cannot find the file specified.).
Msg 3013, Level 16, State 1, Server Server1, Line 4
VERIFY DATABASE is terminating abnormally.
12:31:31.435 #############
12:31:31.435 # Database2 #
12:31:31.435 #############
DBCC execution completed. If DBCC printed error messages, contact your system administrator.
BACKUP DATABASE [Database2] TO DISK = N'D:\Backups\Database2\Database2_backup_Native_FULL.bak' WITH STATS=10,INIT,COMPRESSION;
43 percent processed.
86 percent processed.
99 percent processed.
Processed 296 pages for database 'Database2', file 'Database2' on file 1.
100 percent processed.
Processed 2 pages for database 'Database2', file 'Database2_log' on file 1.
BACKUP DATABASE successfully processed 298 pages in 0.180 seconds (12.893 MB/sec).
The backup set on file 1 is valid.
12:31:32.310 #############
12:31:32.326 # Database3 #
12:31:32.326 #############
DBCC execution completed. If DBCC printed error messages, contact your system administrator.
Msg 5901, Level 16, State 1, Server Server1, Line 1
One or more recovery units belonging to database 'Database3' failed to generate a checkpoint. This is typically caused by lack of system resources such as disk or memory, or in some cases due to database corruption. Examine previous entries in the error log for more detailed information on this failure.
Msg 9002, Level 17, State 4, Server Server1, Line 1
The transaction log for database 'Database3' is full due to 'ACTIVE_TRANSACTION'.
Msg 3013, Level 16, State 1, Server Server1, Line 1
BACKUP DATABASE is terminating abnormally.
Msg 3201, Level 16, State 2, Server Server1, Line 4
Cannot open backup device 'D:\Backups\Database3\Database3_201408260031_backup_Native_DIFF.bak'. Operating system error 2(The system cannot find the file specified.).
Msg 3013, Level 16, State 1, Server Server1, Line 4
VERIFY DATABASE is terminating abnormally.
我只想要数据库3的以下输出：
One or more recovery units belonging to database 'Database3' failed to generate a checkpoint. This is typically caused by lack of system resources such as disk or memory, or in some cases due to database corruption. Examine previous entries in the error log for more detailed information on this failure.
The transaction log for database 'Database3' is full due to 'ACTIVE_TRANSACTION'.
BACKUP DATABASE is terminating abnormally.
Cannot open backup device 'D:\Backups\Database3\Database3_201408260031_backup_Native_DIFF.bak'. Operating system error 2(The system cannot find the file specified.).
VERIFY DATABASE is terminating abnormally.
我已经做到这一点，但需要过滤掉Database3以上的任何错误。
Get-Content ("C:\SampleError.txt") | Select-String -SimpleMatch "Msg" -Context 0, 1 | %{ ($_.Context.PostContext); }
我基本上只需要在最后一个块（＃Database3＃）上过滤Get-Content，但是我找不到正确的方法（LastIndexOf？）。我想出于支持性原因而避免使用正则表达式，但我愿意接受建议。谢谢你的帮助！
答案 0 :(得分：2)
好的，让我们这样做。找到＆＃39; s 12:34:56.789 #############的最后一行，然后找到Get-Content file.txt | select -skip然后很多行，减去3.我也抓住时间和数据库名称，并创建一个自定义对象数组，看起来干净。显然，如果你不想这样做，你可以跳过第2行和第3行的ForEach。
$LinesToSkip = select-string -Path C:\temp\input.txt -Pattern "(\d{2}:\d{2}:\d{2}\.\d{3}\s+?\#+)"|select -last 1 -ExpandProperty linenumber
$Failure = GC C:\temp\input.txt | Where{$_ -Match "(\d{2}:\d{2}:\d{2}\.\d{3})\s+?\#\s+?([^#]+)\s"}|Select -Last 1 |ForEach{$Matches}
$Log = Get-Content C:\temp\input.txt | Select -skip ($LinesToSkip - 3) | Select-String -SimpleMatch "Msg" -Context 0, 1 | Select -ExpandProperty Context | Select -ExpandProperty PostContext | ForEach{[PSCustomObject][Ordered]@{'Database'=$Failure[2];'Failure Time'=$Failure[1];'Message'=$_}}
$Log|FT -AutoSize
$Log|Export-Csv c:\output.csv -NoTypeInformation
输出将转到CSV文件，屏幕上显示如下：
Database Failure Time Message
-------- ------------ -------
Database3 12:31:32.326 One or more recovery units belonging to database 'Database3' failed to gen...
Database3 12:31:32.326 The transaction log for database 'Database3' is full due to 'ACTIVE_TRANSA...
Database3 12:31:32.326 BACKUP DATABASE is terminating abnormally.
Database3 12:31:32.326 Cannot open backup device 'D:\Backups\Database3\Database3_201408260031_bac...
Database3 12:31:32.326 VERIFY DATABASE is terminating abnormally.
答案 1 :(得分：0)
您是否可以使用RegEx过滤＆＃34; Database3＆＃34;？这就是我通常做的事情。
这里是一个链接，其脚本完全符合您的要求 - ＆＃34; ...如果您将-ShowMatchedLines开关与脚本一起使用，则摘要将不会显示，但是，日志中与至少一个模式匹配的每一行都将被输出......＆＃34;：http://cyber-defense.sans.org/blog/2009/06/23/powershell-script-to-search-logs-with-regular-expressions