Foglight for SQL Server (Cartridge) 6.3.0


	NOTE: Foglight 6.3.0 introduces alarm templates to gather alarm rules into a domain-specific template that is easily modified and applied to targets. Avoid editing Foglight for SQL Server rules in the Administration > Rules & Notifications > Rule Management dashboard. Default rules may be modified during regular software updates and your edits will be lost. Always use the Alarm Templates dashboard.

In the Rules Management dashboard, all Foglight for SQL Server rules are displayed in the list. You can restrict the list to show only the rules installed with a cartridge. You can also search the list for a single rule or a group of rules.

To review rules:

In the navigation panel, under Homes, click Administration.

In the Administration dashboard, click Rules.

The Rule Management dashboard opens.

To show only Foglight for SQL Server rules, in the Search box, type the prefix: DBSS.


	TIP: Alternatively, you can select DB_SQL_Server_UI from the Cartridge list.

From here, you can perform the following tasks:

•

Review a short description of the rule.

•

Associate actions with rules.


	NOTE: By default, predefined Foglight for SQL Server rules do not trigger any actions.

•

Create user-defined rules.


	NOTE: User-defined rules are always managed from the Rule Management dashboard; these rules are not displayed in the Foglight Administration — Rules Management Dashboard.

For help with these tasks, open the online help from the Rules Management dashboard.

Collections and Metrics

The Foglight for SQL Server’s agent collects and stores data at all times, even when the browser window that displays the data is not active. The Collection Frequencies view in the Databases Administration dashboard includes a number of predefined collections that are sampled and stored, as well as the data collection values when sampling is carried out in online, offline, and real-time frequency modes.

For more information about working with collections, see the Foglight Administration and Configuration Guide.


	NOTE: All of the information collected according to the definitions described in this section is displayed on Foglight for SQL Server. For details, see the Foglight for SQL Server User Guide.


	NOTE: Several collections contain metrics whose name ends with Rate (for example: Physical Writes Rate and Physical Disks Rate). Such metrics, which are not documented in this guide, are used for plotting the original metric (usually called by the same name without the “Rate” suffix) on a graph for the selected time range.

SQL Server Agent's Default Collections

SQL Server Agent’s Default Collections


Column	Description
Collection Name	The collection name, as retrieved by the agent.
Display Name	The collection name, as displayed in the application’s sections to which the collection retrieves information.
Description	The name of the collection. This list is sorted in alphabetical order.
Offline Frequency	Allows defining the collection interval, in seconds, in low frequency mode (for example: 300). Low frequency mode refers to the frequency at which the agent collects data when no user is currently connected to the monitored instance.
Online Frequency	Allows defining the collection interval, in seconds, in high frequency mode (for example: 60). High frequency mode refers to the frequency at which the agent collects data when none of the currently logged-on users are in focus on a screen, which displays any of the metrics sampled by this collection.
Real-time Frequency	Allows defining the collection interval, in seconds, in real-time frequency mode (for example: 20). Fast frequency mode refers to the frequency at which the agent collects data when one or more of the currently logged-on users are in focus on a screen, which displays any of the metrics sampled by this collection.

Access Methods

Purpose

This collection provides the methods used for accessing and updating logical data within an instance.

Type


Frequency Mode	Collection Interval (In Seconds)
Real-time	20
Online	60
Offline	300

Collection Metrics


Display Name	Description
Forwarded Records	The total number of records that were retrieved by SQL Server during the specified time range. When a row in a table that does not have a clustering index is updated, and if the modified row no longer fits on the old page, SQL Server moves the row to a new page and leaves a forwarding pointer in the old page. As a result, the non-clustered indexes do not have to be modified to reflect the new row location, but will cause subsequent retrieval of this row, by means of non-clustered indexes to require an extra I/O. A high Forwarded Records rate can indicate a need for reorganizing tables (unloading/reloading) or defining clustered indexes.
Free Space Scans	The number of scans initiated to search for free space to insert a new record.
Full Scans	The number of unrestricted full scans per second (either base-table or full-index scans).
Index Searches	The number of index searches per second. These searches are used to start a range scan, reposition a range scan, revalidate a scan point, fetch a single index record, and search down the index to locate where to insert a new row.
Page Allocations	The total number of pages that were allocated to tables or indexes during the specified time range. This metric indicates how fast tables are expanding.
Page Allocations Rate	The rate per second at which pages are allocated to tables or indexes.
Page Deallocations	The total number of pages that were deallocated from tables or indexes during the specified time range. This metric indicates how fast tables are shrinking.
Page Deallocations Rate	The rate per second at which pages are deallocated from tables or indexes.
Page Splits	The number of page splits that took place within the defined time range. Page splitting occurs when an index or data page becomes full and then is split between the existing page and a newly allocated page. Excess page splitting can lead to I/O performance issues. High and increasing values may indicate that either the indexes needs to be rebuilt and / or the indexes fill factor should be increased.
Page Splits vs Page Writes	The ratio of page splits per writes. When an index or data page becomes full during an insert operation, data is split between the current page and a newly allocated page. Excessive page splitting can result in excessive disk I/O, thereby contributing to performance degradation. Higher values of this metric indicate that page splitting affects the monitored application's I/O performance. To resolve this issue, check your database file configuration, the selected index fill factor, and the rate at which your transactions are committed.
Probe Scans	The number of probe scans. A probe scan is used to directly look up rows in an index or base table.
Range Scans	The number of qualified range scans through indexes.
Skipped Ghosted Records	The total number of ghosted records that were encountered by SQL Server during scans over the specified time range. When a record is deleted from a table, SQL Server improves concurrency by not physically removing the row from index leaf levels, but marking it instead as deleted (ghosted). At some later point, a housekeeping process asynchronously removes these rows from the leaf level. Until the records are removed, SQL Server must skip the ghosted records during leaf-level scans.
Skipped Ghosted Records Rate	The rate per second at which SQL Server encounters ghosted records during scans.
Table Lock Escalations	The number of times a lock on a table has been escalated during the specified time range. Lock escalation is not necessarily a problem by itself; however, it can cause concurrency issues and lock conflicts, and can be a major contributor to blocking problems and deadlocks.

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