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This section contains topics that describe issues you might encounter and how to resolve them.
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As outlined in About Domains, the management tier uses a durable distributed log across all brokers to ensure safety under failure (never returning an incorrect response). If you used NuoDB prior to version 2.1 then you will notice that some information is now stored durably whereas previously a broker's state would be completely removed/reset on restart. Because some configuration information is now durable, you might encounter a situation where you need to remove a process or clean state.
EXPLAINstatement might be helpful. For example:
CREATE TABLE t1(a int, b double); CREATE TABLE t2(a int, b double); EXPLAIN (opt_log on) SELECT t1.* FRM t1 WHERE t1.a = t2.a;
Output from the
EXPLAIN statement when the
opt_log option is specified is not guaranteed to be the same from release to release. This output can be used by NuoDB customer support as a debugging tool.