# Performance Testing
The **Log query time** option can be enabled for any [Separation Rule](https://docs.yansalabs.com/simple-data-separation/technical-docs/separation-rules) in order to access detailed execution time & triage performance issues.
{% hint style="info" %}
Log query timing is for testing only and should be disabled after use & in production environments.
{% endhint %}
Log query time on Separation Rule
When enabled, any execution of the Separation Rule (by accessing data on the associated table) will trigger an output of detailed execution timing to the **System Log**.
Query Time Log
The query time log is split into sections:
* **Test Details**: Separation Rule name, table, and initiating user
* **Query Time**: DB query time both before & after data separation parameters have been added. *Note: Query time is non-inclusive of function time.*
* **Function Time**: Time required for each function called during construction of the data separation query. *Note: Function time is non-inclusive of query time. Only those functions used will be shown.*
* *getApproverTasks*: Gather all 'approval needed' records for **Approver overrides**.
* *hasVisibilityGroups*: Assess whether user is member of a **Visibility group**.
* *setValidAccessRequestRecords*: Gather active, approved **Access Request** records.
* *getUserAudience*: Assess user membership for any standard **Separator field** (group, department, company, location, etc). *This can be called multiple times within a single query - timing is provided cumulatively and per-instance.*
* *getDefinedRelationship*: Evaluate a **Defined Relationship**. *This can be called multiple times within a single query - timing is provided cumulatively and per-instance.*
* **Caching**: Details of enablement & usage of cached data
* *Query cache*: Query cache is enabled per [Separation Rule](https://docs.yansalabs.com/simple-data-separation/technical-docs/separation-rules) & caches the results of the query script. Query caching improves overall query generation speed before the query is sent to the database.
* *Session cache*: Session cache is enabled in Simple Data Separation [General Settings](https://docs.yansalabs.com/simple-data-separation/technical-docs/general-settings). Session caching improves performance in many areas of Separation Rule function timing.
