MySQL Insert Hardening

INSERT [Low_priority | DELAYED |High_priority]    [IGNORE] [Into] tbl_name [(Col_name,...)] VALUES ({expr|DEFAULT},...),(...),...[on DUPLICATEKEYUPDATE col_name=expr, ...] OR: INSERT [low_priority| DELAYED |High_priority]    [IGNORE] [into] tbl_name SET col_name={expr |DEFAULT}, ...[on DUPLICATEKEYUPDATE col_name=expr, ...] OR: INSERT [low_priority|High_priority]    [IGNORE] [Into] tbl_name [(Col_name,...)] SELECT...[on DUPLICATEKEYUPDATE col_name=expr, ...]

--assuming that a A, B is a unique index, tables table does not have such rows are normally inserted data, when the conflict, update the value of column C insert into table (A,B,C) VALUES (all-in-one) on DUPLICATE KEY UPDATE c=3;

　

Insert delayed This option is useful if your client cannot wait for the insert to complete, and when a client uses insert delayed, it gets a confirmation from the server immediately. And rows are queued, and the row is inserted when the table is not being used by another thread. Another important benefit of using insert delayed is that insertions from many clients are lumped together and written into a block. This is much faster than performing many separate inserts. INSERT DELAYED into worker (name) VALUES (' Tom '), (' Paul ');

MySQL Insert Hardening