SQL Server34
General18
PostgreSQL17
MongoDB12
MySQL11
Oracle Database9
SQLite8
Redis7
Apache Hadoop5
Apache Cassandra3
Elasticsearch2
IBM Db22
Microsoft Access2
Apache CouchDB1
ClickHouse1
Cloud Firestore1
CockroachDB1
Couchbase1
DuckDB1
Google BigQuery1
InfluxDB1
Milvus1
Neo4j1
Qdrant1
ScyllaDB1
Snowflake1
Supabase1
TiDB1
TimescaleDB1Articles
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DuckDBIntermediateDuckDB can spill to disk, but memory_limit, temp_directory, insertion order and thread count decide whether it does. Settings and query patterns that prevent OOM errors.
#configuration#performance#troubleshooting
MongoDBIntermediateA catalogue of twelve MongoDB modeling patterns, each with a document shape, the query or update that uses it, and what it costs.
#data-modeling#nosql#schema-design
QdrantIntermediateFast until you add a filter? Create payload indexes before loading data so the filterable HNSW can use them, and set up multi-tenant collections the right way.
#indexing#performance#vector-search
MongoDBIntermediateHow to design a MongoDB schema from the workload, the hard limits that constrain it, and seven anti-patterns with a way to detect and fix each.
#data-modeling#nosql#performance
CockroachDBIntermediateSQLSTATE 40001 is how serializable isolation stays correct in a distributed database. Add client-side retries, cut contention, and know when READ COMMITTED fits.
#concurrency#transactions#troubleshooting
SQL ServerIntermediateA diagnostic catalogue of slow query causes in SQL Server: how to tell running from waiting, the plan or wait signature of each cause, and the fix.
#execution-plans#performance#troubleshooting
SnowflakeIntermediateYou pay for warehouse run time, not query work. Find where the credits go, fix auto-suspend and warehouse sizes, and add resource monitors before the next invoice.
#configuration#cost-optimization#performance
SQL ServerIntermediateA query-first method: find the expensive queries, read the plan for signs the missing index DMVs never report, build the index online safely, then verify and roll back.
#execution-plans#indexing#performance
Scan with a FilterExpression still reads and bills every item. Use GSIs, sparse indexes and composite sort keys instead, and know when to send queries elsewhere.
#data-modeling#indexing#nosql
SQL ServerIntermediateHow to measure SQL Server query performance with Query Store, DMVs and Extended Events, pick targets by total resource use, and check the settings that affect every query.
#configuration#db-administration#execution-plans
SupabaseBeginnerNo error, just []. It's almost always Row Level Security. How RLS policies work, how to write and test them, and why the service role key is never the fix.
#security#troubleshooting
SQL ServerIntermediateQuery sys.dm_db_missing_index_details and its companion DMVs, read the numbers critically, find the queries behind each suggestion and merge them into the few indexes worth creating.
#db-administration#execution-plans#indexing
