In the Java world, there are two common types of drivers for Oracle: the pure-Java (a.k.a. thin) driver and the native OCI driver. At the time of writing, no pure Ruby driver, similar to Java's JDBC-based thin driver, exists. In order to connect to Oracle, one needs to install the Ruby/Oracle Call Interface (OCI8) library, which is a database driver based on Ruby/DBI (Database Interface module). RubyDBI provides a database-independent interface for Ruby to talk to databases similar to JDBC or ODBC. The Ruby OCI8 driver provides connectivity to Oracle versions 8 through 10 via standard Oracle Client software. OCI8 is a Ruby wrapper written around native C code which does the actual interaction.
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