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Article0 replies1,330 followingPosted 29 Dec 2025, 00:22 UTC40.3K views867 votes

ClickHouse TTL: Merge-Driven Retention, Not a Cron Job

TTL in ClickHouse is evaluated per-part during background merges, not by a cron job. Learn how to compile a 30-day drop policy, verify with system.ttl, and avoid common pitfalls.

Community & Careers · Blog

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Tasadduq Burneyowner

Started29 Dec 2025, 00:22 UTC

Level 38Owner34,775 rep points

Community & Careers

Article0 replies4,843 followingPosted 06 Jan 2026, 19:51 UTC78.9K views3,221 votes

Designing a Kafka Topic with Log Compaction: Requirements, Minimal Setup, Boundaries, Checks, and Failure Modes

Learn how to size partitions, set compaction triggers, and monitor lag so that Kafka log compaction retains only the latest value per key without unexpected latency or storage spikes.

Community & Careers · Guide

apachekafka data-retention streaming

Community & Careers

Article0 replies3,248 followingPosted 08 Oct 2025, 19:26 UTC54.4K views1,479 votes

Automating Elasticsearch Index Management with ILM: Rollover, Shrink, and Delete

Learn how to configure Elasticsearch Index Lifecycle Management to automate rollover, shrink, and deletion of indices. Follow a step‑by‑step guide, verify with APIs, and recover if something goes wrong.

Community & Careers · Guide

data-retention

elasticsearch ilm

Community & Careers

Article0 replies2,656 followingPosted 21 Feb 2026, 23:05 UTC79.3K views3,585 votes

MongoDB TTL Indexes: Let the Database Delete Your Expired Data (With Caveats)

MongoDB TTL indexes delete expired documents for you — no cron job required. Here's how they work, a working configuration, and the operational caveats that matter before you rely on them.

Community & Careers · Blog

data-retention database-design

mongodb

Community & Careers

Article0 replies3,489 followingPosted 07 Jun 2026, 11:10 UTC51.8K views1,562 votes

Managing Storage Costs with InfluxDB Retention Policies

Learn how to implement and manage InfluxDB Retention Policies to automate data expiration, control disk usage, and balance historical data needs against storage costs.

Community & Careers · Guide

time-series data-retention storage-optimization

Community & Careers

Article0 replies1,148 followingPosted 05 Jul 2026, 07:25 UTC141.1K views1,828 votes

Let MongoDB Delete Your Expired Data: TTL Indexes as an Engineering Decision

MongoDB TTL indexes delete expired sessions, tokens, and logs for you — no cron job required. Here's how they work, where they fall short, and how to verify them.

Community & Careers · Blog

data-retention

mongodb ttl-index

Community & Careers

Article0 replies2,356 followingPosted 17 May 2026, 07:49 UTC45.6K views2,438 votes

Setting Up ClickHouse TTL Policies to Expire Old Data Automatically

How to configure ClickHouse TTL expressions on MergeTree tables to delete or relocate aged data, verify expiration through system tables, and recover from a misfiring policy.

Community & Careers · Guide

data-retention ttl

clickhouse

Community & Careers

Article0 replies4,720 followingPosted 10 Oct 2025, 01:13 UTC107.8K views2,305 votes

Architecting Long-Term Retention with Apache Pulsar Tiered Storage

Learn how to implement Apache Pulsar Tiered Storage to decouple data retention from compute costs while maintaining transparent data access via object stores.

Community & Careers · Guide

cloud-architecture data-retention apache-pulsar

Oracle Cloud

Question0 answers3,189 followingPosted 22 Jun 2025, 01:07 UTC70.1K views4,062 votes

Flashback Data Archive: History Tablespace Quota and Retention Enforcement

Flashback Data Archive Storage Constraints Oracle Flashback Data Archive (FDA) utilizes a dedicated history tablespace to store row versions for long-term tracking. While the RETENTION parameter defines the logical window for historical queries, the physical availability of space is governed by the archive tablespace quota. Storage Exhaustion vs. Retention P

Oracle Cloud · Editorial question

oracle-database data-retention flashback-data-archive