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tune SQLite PRAGMAs for production
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Add journal_size_limit (64MB), default_transaction_mode: :immediate,
and mmap_size (128MB) across dev, test, and prod configs. Benchmarks
showed IMMEDIATE mode eliminates transaction upgrade BUSY errors and
mmap improves read throughput.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
jamey 2026-02-22 09:23:41 +00:00
parent 162bf4ca53
commit 19d8c7d0fd
3 changed files with 11 additions and 2 deletions
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3
config/dev.exs
View File

@ -6,6 +6,9 @@ config :berrypod, Berrypod.Repo,
pool_size: 5, pool_size: 5,
journal_mode: :wal, journal_mode: :wal,
busy_timeout: 5000, busy_timeout: 5000,
journal_size_limit: 67_108_864,
default_transaction_mode: :immediate,
custom_pragmas: [mmap_size: 134_217_728],
stacktrace: true, stacktrace: true,
show_sensitive_data_on_connection_error: true show_sensitive_data_on_connection_error: true

5
config/runtime.exs
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@ -32,7 +32,10 @@ if config_env() == :prod do
database: database_path, database: database_path,
pool_size: String.to_integer(System.get_env("POOL_SIZE") || "5"), pool_size: String.to_integer(System.get_env("POOL_SIZE") || "5"),
journal_mode: :wal, journal_mode: :wal,
busy_timeout: 5000 busy_timeout: 5000,
journal_size_limit: 67_108_864,
default_transaction_mode: :immediate,
custom_pragmas: [mmap_size: 134_217_728]
# The secret key base is used to sign/encrypt cookies and other secrets. # The secret key base is used to sign/encrypt cookies and other secrets.
# A default value is used in config/dev.exs and config/test.exs but you # A default value is used in config/dev.exs and config/test.exs but you

5
config/test.exs
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@ -15,7 +15,10 @@ config :berrypod, Berrypod.Repo,
journal_mode: :wal, journal_mode: :wal,
busy_timeout: 15_000, busy_timeout: 15_000,
queue_target: 5_000, queue_target: 5_000,
queue_interval: 10_000 queue_interval: 10_000,
journal_size_limit: 67_108_864,
default_transaction_mode: :immediate,
custom_pragmas: [mmap_size: 134_217_728]
# We don't run a server during test. If one is required, # We don't run a server during test. If one is required,
# you can enable the server option below. # you can enable the server option below.