Thomas (and Noel),
Last time I checked, SELECT ... FOR UPDATE ensures tables get
locked, but does not specify what in what order (for multi-table
queries). Whether for H2 or SQL as a whole, locking order for multiple
tables seems to be treated as an implementation detail. Again, this is a
guess based on what I've experienced so far. Please let me know if I'm
wrong.
After much consideration, I think I will give up and simply push
the problem out to the client: http://stackoverflow.com/q/16628713/14731
... Not ideal, but (I think) it'll work.
Gili
On 20/05/2013 9:34 AM, Thomas Mueller wrote:
Hi,
Yes, if it's a problem, you could lock one table at a time (using
"select ... for update").
Regards,
Thomas
On 20/05/2013 9:29 AM, Noel Grandin wrote:
It's basically a non-problem.
In 20 years of database programming, I've never seen it myself.
For people who did see it, the recommended approach was to lock the
data by hand for the relevant queries, using LOCK TABLE or FOR UPDATE
clauses.
On Sat, May 18, 2013 at 1:58 AM, Gili <[email protected]
<mailto:[email protected]>> wrote:
Hi,
I wanted to get your opinion regarding
http://stackoverflow.com/a/112256/14731
Is it fair to say that database deadlocks are not preventable:
1. Using portable SQL, since the SQL standard does not specify
lock ordering;
2. Using database-specific SQL code, because the execution plan of
a database might change over time.
Thank you,
Gili
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