Understanding SQLite's Durability Settings and Performance Trade-offs
By
ciconia
9mo ago· 4 min readenInsight
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Summary
The article examines SQLite's durability settings, highlighting the confusion and conflicting information in its documentation regarding when data is truly durable. It explains that durability ensures committed transactions survive system crashes or power loss, typically achieved through fsync calls on Unix systems. The piece discusses the performance trade-offs of durability and reveals that SQLite's default settings may not guarantee true durability, with even the creator's comments contradicting official documentation on this critical database property.
Key quotes
· 4 pulledDurability means that after a transaction commits, you can be confident that, absent catastrophic hardware failure, the changes made by the commit won't be lost.
Durability comes at a performance cost, and sometimes applications don't need durability.
On Linux, and most other Unix operating systems, durability is ensured by calling the fsync system call at the right time.
The documentation and even comments from its creator give conflicting answers about SQLite's durability guarantees.
Is SQLite durable by default? What settings guarantee durability? The documentation and even comments from its creator give conflicting answers.
