---
cuppy_hub: azure
cuppy_path: reference/monitor/log-analytics-workspaces.md
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cuppy_updated: 2026-10-23T16:16:52.575Z
cuppy_canonical: https://cuppy.io/azure/docs/reference/monitor/log-analytics-workspaces
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---


# Log Analytics workspaces

## Design

**Start with one workspace** (per Entra tenant); data volume doesn't slow queries. Split only for a real reason: data residency per region, egress cost, separate billing or commitment tiers, or resilience (ingest into workspaces in two regions). Workspace-based Application Insights, diagnostic settings and agents all write into it.

## Table plans and retention

| Plan | For | Trade-offs |
|---|---|---|
| **Analytics** | Monitoring, alerts, latency-sensitive queries | Full features; highest ingestion cost |
| **Basic** | Troubleshooting data | Queries billed; **30 days** of query access; summary rules and resource-context queries limited |
| **Auxiliary / Lake** | High-volume, verbose data kept cheaply | **Alerts stop working** on the table; queries billed |

- Tables keep data **30 days** by default (some built-in tables 90). Analytics retention extends to **two years**; total retention (including low-cost long-term retention, reached through **search jobs**) to **12 years**.
- Shortening total retention waits 30 days before deleting, so a mistake can be reverted; lengthening applies to data not yet removed.

## Access

- **Access control mode** (`features.enableLogAccessUsingOnlyResourcePermissions`): *Use resource or workspace permissions* (true; the default since March 2019) lets anyone with `read` on a resource query that resource's logs in **resource context**; *Require workspace permissions* (false) needs a workspace or table role.
- Roles: **Log Analytics Reader** (read data and monitoring settings), **Log Analytics Contributor** (also configure), **Log Analytics Data Reader** (minimum query rights; for granular, condition-based RBAC). Querying needs `Microsoft.OperationalInsights/workspaces/query/read`; resource-context needs `Microsoft.Insights/logs/<table>/read`.
- Resource context works only for records with `_ResourceId`, only on Analytics tables, and for Application Insights only when it's workspace-based.
- `features.disableLocalAuth` turns off the workspace's shared-key authentication.

## Daily cap

A daily cap **stops collecting billable data** in Analytics and Basic tables until the workspace's reset hour (fixed per workspace, not configurable); some data beyond the cap still lands. It's a budget guard, not a cost-saving tool: alert on it, because monitoring and alerts go blind once it's reached.

## Querying from TypeScript

```ts
import { DefaultAzureCredential } from "@azure/identity";
import { LogsQueryClient, LogsQueryResultStatus, Durations } from "@azure/monitor-query-logs";

const credential = new DefaultAzureCredential();

// Query: needs Log Analytics Reader (or table/resource-level read) on the workspace.
export async function failedRequests(workspaceId: string): Promise<void> {
  const logs = new LogsQueryClient(credential);
  const kql = "AppRequests | where Success == false | summarize failures = count() by bin(TimeGenerated, 5m) | order by TimeGenerated desc";
  const result = await logs.queryWorkspace(workspaceId, kql, { duration: Durations.oneHour }, { serverTimeoutInSeconds: 120 });
  if (result.status === LogsQueryResultStatus.Success) {
    for (const row of result.tables[0]?.rows ?? []) console.log(row);
  } else {
    // PartialFailure: some data came back (limits, timeouts); don't treat it as complete. Full failures throw.
    console.warn(result.partialError.code, result.partialError.message);
  }
}
```

`workspaceId` is the workspace's **customer ID** (a GUID), not its resource ID; use `queryResource` with a resource ID for resource-context queries.

| Limit or error | Detail |
|---|---|
| Concurrency | 5 concurrent Analytics queries per user (2 for Basic/Auxiliary); more wait in a FIFO queue |
| **429** | Queued over 3 minutes, more than 200 queued, or over **200 queries per 30 seconds** per user |
| Timeout | 3 minutes by default, up to 10 (`serverTimeoutInSeconds`) |
| Partial results | A non-fatal error during execution: HTTP 200 with tables plus an `error` of code `PartialError`; the SDK returns `PartialFailure` |
| Cross-resource | At most 100 workspaces and Application Insights resources in one query |


---
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