https://escalopa.com/en/tags/databases/Recent content in Databases on EscalopaHugo -- gohugo.ioenahmed.helaly.dev@google.com (Ahmed Helaly)ahmed.helaly.dev@google.com (Ahmed Helaly)© 2026 Ahmed HelalyFri, 10 Jul 2026 00:00:00 +0000https://escalopa.com/en/posts/postgresql-indexes-from-query-shape/Tue, 25 Mar 2025 00:00:00 +0000ahmed.helaly.dev@google.com (Ahmed Helaly)https://escalopa.com/en/posts/postgresql-indexes-from-query-shape/Design indexes from predicates, join keys, ordering, selectivity, and write cost together.https://escalopa.com/en/posts/reading-explain-analyze-without-guessing/Wed, 20 May 2026 00:00:00 +0000ahmed.helaly.dev@google.com (Ahmed Helaly)https://escalopa.com/en/posts/reading-explain-analyze-without-guessing/Compare estimated and actual rows first, then find where time, loops, or memory multiply.https://escalopa.com/en/posts/transaction-isolation-through-anomalies/Wed, 19 Feb 2025 00:00:00 +0000ahmed.helaly.dev@google.com (Ahmed Helaly)https://escalopa.com/en/posts/transaction-isolation-through-anomalies/Choose isolation by naming the anomaly that would violate a business invariant.https://escalopa.com/en/posts/the-lost-update-and-how-to-prevent-it/Sat, 12 Apr 2025 00:00:00 +0000ahmed.helaly.dev@google.com (Ahmed Helaly)https://escalopa.com/en/posts/the-lost-update-and-how-to-prevent-it/Atomic updates, locks, or optimistic versions must protect read-modify-write as one decision.https://escalopa.com/en/posts/keyset-pagination-in-postgresql/Thu, 29 Aug 2024 00:00:00 +0000ahmed.helaly.dev@google.com (Ahmed Helaly)https://escalopa.com/en/posts/keyset-pagination-in-postgresql/Seek from the last ordered key to keep page cost stable and results coherent.https://escalopa.com/en/posts/zero-downtime-schema-migrations/Fri, 09 May 2025 00:00:00 +0000ahmed.helaly.dev@google.com (Ahmed Helaly)https://escalopa.com/en/posts/zero-downtime-schema-migrations/Expand, migrate, verify, switch, and contract across independently deployed application versions.https://escalopa.com/en/posts/redis-caching-without-stale-data-surprises/Wed, 16 Oct 2024 00:00:00 +0000ahmed.helaly.dev@google.com (Ahmed Helaly)https://escalopa.com/en/posts/redis-caching-without-stale-data-surprises/Define ownership, expiry, invalidation, stampede control, and degraded behavior before adding cache code.https://escalopa.com/en/posts/cache-stampede-protection/Fri, 10 Jul 2026 00:00:00 +0000ahmed.helaly.dev@google.com (Ahmed Helaly)https://escalopa.com/en/posts/cache-stampede-protection/Request coalescing, early refresh, and jitter keep one expiry from becoming a dependency spike.https://escalopa.com/en/posts/kafka-partitioning-and-consumer-parallelism/Sun, 02 Mar 2025 00:00:00 +0000ahmed.helaly.dev@google.com (Ahmed Helaly)https://escalopa.com/en/posts/kafka-partitioning-and-consumer-parallelism/The key determines ordering and skew; partition count sets the ceiling for group parallelism.https://escalopa.com/en/posts/kafka-delivery-semantics-in-practice/Thu, 18 Sep 2025 00:00:00 +0000ahmed.helaly.dev@google.com (Ahmed Helaly)https://escalopa.com/en/posts/kafka-delivery-semantics-in-practice/Offsets and side effects must share a recoverable protocol to survive crashes between them.https://escalopa.com/en/posts/clickhouse-table-design-for-event-analytics/Sat, 03 Aug 2024 00:00:00 +0000ahmed.helaly.dev@google.com (Ahmed Helaly)https://escalopa.com/en/posts/clickhouse-table-design-for-event-analytics/Partition for lifecycle, order for filtering locality, and measure cardinality before choosing codecs.https://escalopa.com/en/posts/etcd-transactions-for-coordination/Tue, 04 Mar 2025 00:00:00 +0000ahmed.helaly.dev@google.com (Ahmed Helaly)https://escalopa.com/en/posts/etcd-transactions-for-coordination/Compare-and-swap plus leases can encode ownership, but clients must handle revision and expiry races.https://escalopa.com/en/posts/postgis-nearest-neighbor-queries/Tue, 11 Nov 2025 00:00:00 +0000ahmed.helaly.dev@google.com (Ahmed Helaly)https://escalopa.com/en/posts/postgis-nearest-neighbor-queries/Use spatial indexes and distance operators that preserve indexability before calculating exact distance.https://escalopa.com/en/posts/connection-pools-are-capacity-limits/Mon, 18 Nov 2024 00:00:00 +0000ahmed.helaly.dev@google.com (Ahmed Helaly)https://escalopa.com/en/posts/connection-pools-are-capacity-limits/Pool size must reflect database concurrency, transaction duration, and queueing—not application goroutine count.https://escalopa.com/en/posts/choosing-between-redis-and-memcached/Wed, 19 Nov 2025 00:00:00 +0000ahmed.helaly.dev@google.com (Ahmed Helaly)https://escalopa.com/en/posts/choosing-between-redis-and-memcached/Choose from data model, persistence, operations, clustering, and failure behavior rather than benchmark headlines.