Content Check
Content CheckContent check is a way to check the presence of specific info on the page.
Content Check Content check is a way to check the presence of specific info on the page.

Content check is a way to check the presence/absence of specific info on the page. It helps to check not just the page itself for accessibility, but the performance of the site too. It is useful for sites with complicated structure - which contain many scripts and data that is stored in database or other off-site storages. In this case, there is possible cases when the page itself is working fine while some of the linked resources are not available - thus, some info on the page is missed.

HostTracker provides tools to solve this problem. You may create ContentCheck task and provide specific keywords for monitoring:

There are several important things on that screen:

Content Check - set of comma-separated keywords to look for.
Advanced Content Check option - useful for immediate detection of the reasons of a problem. In case of appearance of the keyword, the phrase, previous to the keyword, is sent you as the result of the check. For example, you enter keyword exception and select this option. Somehow, on the page appears the statement: Wrong SQL statement on the line 123 exception. In this case, you get an alert saying Wrong SQL statement on the line 123.
Conditions Field - allows to specify conditions for set of keywords. You may set to detect an error in case of presence/absence of all entered keywords, or just any of them.

For monitoring the presence of images, videos, execution scripts - you may choose a keyword from their description, or add a special short script which will return Error or other keyword if something is missed.

Restrictions:
Only first 10 Kb of page are analysed
Only first 120 characters of each line are analysed

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- Del.
Database Monitoring with HostTracker

We’re happy to introduce our newest monitoring feature - Database Check – that is easy to use, crystal-clear to understand and designed to get you through your website ‘critical hours’ as smoothly as possible.

We’re happy to introduce our newest monitoring feature - Database Check – that is easy to use, crystal-clear to understand and designed to get you through your website ‘critical hours’ as smoothly as possible.

There is a wealth of different collector services for gathering and analyzing performance information from, for example, the number of visitors, disk usage to the duration of a database session and geographical distribution of the audience that visits the website. In the real world, it is very common to find two or more of these metrics presented together. Anyway, the problem is that you should not only assess these numbers but also somehow examine and compare them.

All that made HostTracker team eventually develop a Database Check – a perfect tool for deep database monitoring and successful troubleshooting database performance problems.

Task Configuration Concepts

Generally speaking, adding a new Database Check won't take long to set up. Once it is enabled, you’ll get the chance to adjust the check to suit your overall strategy. Now let’s look at some of the available options to better understand how they can be effectively applied.

First and foremost, this feature has an option to include a specific database query every time you run the check, whilst still having the opportunity to manage the processing data. If you don’t want to specify any query – the service will verify the ability to connect to the database. In addition, the Database Check tool supports a deferred execution option, which allows you to specify the point of query declaration and track its results.

Besides that, you can use any command - from a simple Select statement to a more complex procedure, - as a database query. However, the specified request should be executed in 30 seconds or less, otherwise, the error message will be generated. Basically, you’ll get the 408 Request Timeout or related error.

Please note: When enabling a new DB monitoring check, there are a couple of things to consider. Use an SQL statement that returns a single value. Furthermore, this value should be returned in the first column of the first row. This step is vital for further performance analysis of the monitored system.  

At the same time, in case of using a DML command as a statement, you’ll also get the total number of rows being affected.

The following example shows the graphical interpretation of the results from executing DELETE statement, according to the specified condition:

For the record, the collected results are not only displayed in a real-time graph, but also stored for later analysis. Besides, such a solution can really help to get valuable insights into how to optimize your database performance.

Moreover, at this stage, you can specify the type of selection criteria. You can choose from no, equal/not equal, greater/less than, in/out of range.

Once the system finds some deviation in records from the expected results - you will receive a notification. To boot, you can control which events you want to receive alerts for and which ways (Skype, Viber, Telegram, Slack etc.).

First Steps In Starting Successful Performance Troubleshooting

This example shows how to create a check for both tracking the growth of all the database log and data files and getting alerts when critical database size is reached. It implies, the following example contains information about the file data/log file size, the total space used, free space details etc. So what you need to do:

  1. Create a new query that displays how much free space you have in your tablespace.

          SELECT
          convert(DECIMAL(12,2),round(sysfile.size/128.000,2)) AS 'FileSize/mb'
          , convert(DECIMAL(12,2),round(fileproperty(sysfile.name,'SpaceUsed')/128.000,2))
          AS 'Used/mb'
          , convert(DECIMAL(12,2),round((sysfile.size-fileproperty(sysfile.name,'SpaceUsed'))/128.000,2))
          AS 'Free/mb'
          , filegroup.groupname AS 'File-group'
          , sysfile.[name],sysfile.[filename]
          FROM dbo.sysfiles sysfile (NOLOCK)
          inner join dbo.sysfilegroups filegroup (NOLOCK) ON filegroup.groupid =
          sysfile.groupid
          UNION ALL 
          SELECT
          convert(DECIMAL(12,2),round(sysfile.size/128.000,2)) AS 'FileSize/mb'
          , convert(DECIMAL(12,2),round(fileproperty(sysfile.name,'SpaceUsed')/128.000,2))
          AS 'Used/mb'
          , convert(DECIMAL(12,2),round((sysfile.size-fileproperty(sysfile.name,'SpaceUsed'))/128.000,2))
         AS 'Free/mb'
         , (CASE WHEN sysfile.groupid = 0 THEN 'Log' END) AS 'File-group'
         , sysfile.[name],sysfile.[filename]
         FROM dbo.sysfiles sysfile (NOLOCK) WHERE groupid = 0
         ORDER BY [File-group],sysfile.[name]         

      2.  After execution, you should get the following results:

     3.  Add a condition of selection:

  • Query result - select "value in the first column of the first row (mainly for SELECT)".
  • Result verification - choose "less than" and add "1000"  as the max value.

Finally, you’ll get the following result once all the previous stages have been successfully completed: if the log file size exceeds 1 GB, you’ll receive a notification.

Please keep in mind all data collection history information is saved and always available to view. It means you can easily identify the cause of this or that problems, for instance, the reason for rapid tablespace growth.

Adding a New Database Monitoring Task

To activate a new Database Check you need:

      1.  Fill in the following fields:

  • Server – enter your server name;

  • Port -  add your port number;

  • Database – add your database name;

  • User ID- enter the login name under which the check should be executed;

  • Password – add the password that corresponds to your login.

For this task only, it is recommended to create a new user account with limited rights.

       2.  Provide access to your database. For this, add the IP addresses of the HostTracker agents to a Firewall Whitelist and your server list.

Note that, the IP addresses of our agents are permanent.

       3.  When ready, click on Save.

If you have any questions about this feature, well, just send us a message. We’re always ready to help!

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Home > Blog > dnsbl_check

We’re happy to announce that this tool has just got even more awesome! Now you can use our DNSBL check tool as a one-time job or on a regular basis. It means you can keep your IP address in a continuous check against dozens of the most popular blacklists. 

Previously, we have introduced one of the “Check site instantly ” board functions -  DNSBL - which helps you find out whether your server is blacklisted before it gets out of control.

We’re happy to announce that this tool has just got even more awesome! Now you can use our DNSBL check tool as a one-time job or on a regular basis. It means you can keep your IP address in a continuous check against dozens of popular blacklists. 

This can significantly ease your website’s life online, moreover, bring balance into it.

New options

With the new extension of the DNSBL check tool, it's become easier to test your website accessibility, as well as, server message deliverability.

For example, suppose your IP address is currently on the DNSBL monitoring. The moment your website is found blacklisted, our system will report back to you all the detailed information on the check results - the name of the blacklist (which one of the DNS-based anti-spam lists recognize you as a source of spam activity) and the reason for listing (this information is public and provided directly by DNSBL databases).

All this will allow you to quickly clean up “the mess”, speed up the process of domain removal (delisting), protect your business reputation and, by extension, prevent recurrence of such a problem in the future.

HostTracker, as a website monitoring service, always keeps moving forward - our list of DNSBL servers is constantly updated.

The whole setup process will take you only a few minutes to complete:

Some Secrets of Activating Blacklist Monitoring

The good news is that you’re opted to activate the DNSBL check for already existing monitoring tasks. All you need to do is to put a tick mark in the box next to “DNSBL check” field when editing or adding a check task.

Once enabled, HostTracker starts gathering information about your website availability and checking whether your IP is currently listed. A Contact Group for notifications will be automatically added to the current test task. If our system finds your server blacklisted, you’ll immediately receive a message with the relevant information.

We hope that with such a tool you’ll enjoy the convenience, simplicity and quality of our all-in-one monitoring service. If you have any questions or suggestions, feel free to contact us - we’re always looking for ways to improve! 

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