Data and storageCheaper fixes
Joins are slow, so copy the reviewer’s name onto every review?
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More questions.
Data and storageCounting rules
Why can’t any constraint stop the 21st Deluxe booking on its own?
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Data and storageHot parents
Why would 2,000 orders a second freeze one merchant’s row?
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Data and storageBoundaries
Why does ACID end the moment you call the bank’s API?
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Data and storageTrade-offs
Should every transaction just run at SERIALIZABLE?
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Data and storagePostgreSQL
Why does PostgreSQL quietly swap your READ UNCOMMITTED for something safer?
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Data and storageForm edits
Two agents edit one ticket. Why does the priority quietly revert?
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Data and storageSharding
Your bookings are sharded. Why do overlap checks stop working?
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Data and storageMigration
Moving from MySQL to PostgreSQL. Which habits quietly break?
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Data and storageSSI
How does PostgreSQL stop write skew without ever making a reader wait?
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Data and storageLong transactions
Why can one forgotten BEGIN bloat the whole database?
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Data and storageSKIP LOCKED
Ten workers, one jobs table. Why does only one job run at a time?
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Data and storageReplication slots
You retired a CDC pipeline. Why did the primary’s disk fill up?
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Data and storageThrottling
Why doesn’t adding autovacuum workers make vacuum any faster?
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Data and storageSelectivity
There’s an index on status. Why does the database still read everything?
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Data and storageSkip scan
Your index leads with the wrong column. How does PostgreSQL 18 still use it?
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Data and storageVisibility map
Why does an index-only scan read the table again after an hour of writes?
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Data and storagework_mem
How can a 256 MB memory setting add up to 250 GB?
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Data and storageDataLoader
How does GraphQL turn 50 brand lookups into one query?
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Data and storagePool exhaustion
Why did a 400 ms slowdown take every pod offline?
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Data and storageNot sharding
Why can’t partitioning rescue a database drowning in writes?
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Data and storageShard keys
Every timestamp is unique. So why is created_at a terrible shard key?
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Data and storageBackups
Your orders live on every replica. How does one DROP TABLE erase them all?
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Data and storageSloppy quorums
2 + 2 > 3, yet your read misses the write. How?
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Data and storageHeadroom
Traffic triples yearly. Why is 30% CPU today already a deadline?
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Data and storageCDNs
In one CDN cluster, about 74% of objects were requested once. Why cache them?
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