开发相关规范 explain select from toids; QUERY PLAN Remote Fast Query Execution (cost0.00..0.00 rows0 width0) Node/s: dn01, dn02 > Seq Scan on toids (cost0.00..16.30 rows630 width76) (3 rows) teledb explain select id from toids; QUERY PLAN Remote Fast Query Execution (cost0.00..0.00 rows0 width0) Node/s: dn01, dn02 > Seq Scan on toids (cost0.00..16.30 rows630 width4) (3 rows) 3. 建议update时尽量做<>判断,如update tablea set columnb c where columnb <> c; plaintext teledb update toids set city '测试'; UPDATE 4 teledb select xmin, from toids; xmin id name birth city ++++ 1181 1 张三 20001201 00:00:00 测试 1147 3 王五 20040901 00:00:00 测试 1147 4 陈六 20220101 00:00:00 测试 1181 2 李四 19970324 00:00:00 测试 (4 rows) teledb update toids set city '测试'; UPDATE 4 teledb select xmin, from toids; xmin id name birth city ++++ 1182 1 张三 20001201 00:00:00 测试 1182 2 李四 19970324 00:00:00 测试 1148 3 王五 20040901 00:00:00 测试 1148 4 陈六 20220101 00:00:00 测试 (4 rows) teledb