Re: [SQLite] Use of db:exec cause 5 second delay
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- Subject: Re: [SQLite] Use of db:exec cause 5 second delay
- From: David Favro <lua@...>
- Date: 2014年1月29日 13:06:28 -0500
On 01/29/2014 11:41 AM, Gilles Ganault wrote:
I noticed that the "db:exec" part of the following script waits for
about 5s when running on a Linux appliance:
-- stalls for about 5s
db:exec[[
CREATE TABLE IF NOT EXISTS test (id INTEGER PRIMARY KEY, content);
INSERT INTO test VALUES (NULL, 'Hello World');
INSERT INTO test VALUES (NULL, 'Hello Lua');
INSERT INTO test VALUES (NULL, 'Hello Sqlite3')
]]
Wrap all that into one transaction, like:
db:exec[[
BEGIN TRANSACTION;
CREATE TABLE IF NOT EXISTS test (id INTEGER PRIMARY KEY, content);
INSERT INTO test VALUES (NULL, 'Hello World');
INSERT INTO test VALUES (NULL, 'Hello Lua');
INSERT INTO test VALUES (NULL, 'Hello Sqlite3');
COMMIT;
]]
SQLite3 by default makes each statement into a separate transaction, and
syncs to physical disk (not filesystem buffers) at each commit. Still, 5
seconds for 4 statements is a bit extreme, so I'm guessing that your
appliance has slow-write storage, like maybe flash.