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In biology, replication is the act or ability to make a copy.
(Mostly commonly meaning molecular replication).
- Self-replication is the act of a molecule (or any other
pattern) making a copy of itself.
- DNA replication is the act of copying the genetic material of a
cell (DNA) to a daughter cell
is almost, but not quite, a form of self-replication because it requires the cellular apparatus to perform that replication.
- Semiconservative replication is the
particular mechanism of DNA replication, of several mechanisms that were originally hypothesised, that was found to be actually
used in cells.
In computer science, replication is the
provision of redundant resources (software or hardware components) to improve reliability and fault-tolerance.
Storage or backup of the same data on multiple file systems is an example
for replication. Database replication is implemented, for example in MySQL, usually with a master slave relationship between the
original and the copy. Updates are logged at the master and rippled through to the slave. The slave outputs a message stating the
last update it successfully received, so that subsequent updates can be sent (and resent) until successfully applied. See also
Coda and RAID.
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