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mod_storage_sql: Add setting to tune SQLite3 performance vs safety

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Notably the default journal_mode of DELETE is somewhat slow, some users
might want to catch up to the amazing performance of internal storage.
This commit is contained in:
Kim Alvefur 2023-06-11 17:04:11 +02:00
parent 0b74dcbdfb
commit 5d6098bc1a
1 changed files with 38 additions and 0 deletions
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38
plugins/mod_storage_sql.lua
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@ -910,6 +910,44 @@ function module.load()
compile_options[opt or option] = tonumber(val) or val or true;
end
engine.sqlite_compile_options = compile_options;
local journal_mode = "delete";
for row in engine:select[[PRAGMA journal_mode;]] do
journal_mode = row[1];
end
-- Note: These things can't be changed with in a transaction. LuaDBI
-- opens a transaction automatically for every statement(?), so this
-- will not work there.
local tune = module:get_option_string("sqlite_tune", "default");
if tune == "normal" then
if journal_mode ~= "wal" then
engine:execute("PRAGMA journal_mode=WAL;");
end
engine:execute("PRAGMA auto_vacuum=FULL;");
engine:execute("PRAGMA synchronous=NORMAL;")
elseif tune == "fast" then
if journal_mode ~= "wal" then
engine:execute("PRAGMA journal_mode=WAL;");
end
if compile_options.secure_delete then
engine:execute("PRAGMA secure_delete=FAST;");
end
engine:execute("PRAGMA synchronous=OFF;")
engine:execute("PRAGMA fullfsync=0;")
elseif tune == "safe" then
if journal_mode ~= "delete" then
engine:execute("PRAGMA journal_mode=DELETE;");
end
engine:execute("PRAGMA synchronous=EXTRA;")
engine:execute("PRAGMA fullfsync=1;")
end
for row in engine:select[[PRAGMA journal_mode;]] do
journal_mode = row[1];
end
module:log("debug", "SQLite3 database %q operating with journal_mode=%s", engine.params.database, journal_mode);
end
module:set_status("info", "Connected to " .. engine.params.driver);
end, function (engine) -- luacheck: ignore 431/engine