Default Transaction Isolation Level을 정리함.
서비스 상황에 따라서, DBA가 read uncommitted로 지정하기도 함

오라클 DB - Read committed http://www.stanford.edu/dept/itss/docs/oracle/10g/server.101/b10743/consist.htm

큐브리드 DB - REPEATABLE READ CLASS with READ UNCOMMITTED INSTANCES
  (테이블은 repeatable read, instance(row)는 read uncommitted라는 말)
http://www.cubrid.com/online_manual/cubrid_831/syntax/syntax_tran_isolation_setting.htm

MSSQL - Read commited
http://www.mssqlcity.com/Articles/General/TIL.htm

Mysql InnoDB - repeatable read
http://dev.mysql.com/doc/refman/5.0/en/innodb-transaction-model.html

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