---
title: Manage InfluxDB internal systems
description: Manage the internal systems of InfluxDB such as the Time Series Index (TSI), the time-structured merge tree (TSM) storage engine, and the write-ahead log (WAL).
url: https://docs.influxdata.com/influxdb/v2/admin/internals/
estimated_tokens: 402
product: InfluxDB OSS v2
version: v2
---

# Manage InfluxDB internal systems

This page documents an earlier version of InfluxDB OSS. [InfluxDB 3 Core](/influxdb3/core/) is the latest stable version.

#### API token hashing is enabled by default in InfluxDB OSS 2.9.0

Stronger token security: tokens are stored as hashes on disk, so a copy of the database file doesn’t expose usable tokens. Existing tokens are hashed on first startup and the original strings can’t be recovered afterward — **capture any plaintext tokens you still need before you upgrade**.

For more information, see [Token hashing](/influxdb/v2/admin/tokens/#token-hashing).

Manage InfluxDB internal systems, including the time series index (TSI), time-structured merge tree (TSM) storage engine, and write-ahead log (WAL).

### [Manage the InfluxDB time series index (TSI)](/influxdb/v2/admin/internals/tsi/)

The InfluxDB [time series index (TSI)](/influxdb/v2/reference/internals/storage-engine/#time-series-index-tsi) indexes or caches measurement and tag data to ensure queries are performant. Use the `influxd inspect` command to manage the TSI index.

[storage](/influxdb/v2/tags/storage/) [internals](/influxdb/v2/tags/internals/)