README.md in embulk-output-oracle-0.2.1 vs README.md in embulk-output-oracle-0.2.2

@@ -3,30 +3,46 @@
 Oracle output plugins for Embulk loads records to Oracle.
 
 ## Overview
 
 * **Plugin type**: output
-* **Load all or nothing**: depnds on the mode:
+* **Load all or nothing**: depends on the mode:
   * **insert**: no
   * **replace**: yes
 * **Resume supported**: no
 
 ## Configuration
 
 - **driver_path**: path to the jar file of the Oracle JDBC driver (string)
-- **host**: database host name (string, required if url is not set)
+- **host**: database host name (string, required if url is not set or insert_method is "oci")
 - **port**: database port number (integer, default: 1521)
 - **user**: database login user name (string, required)
 - **password**: database login password (string, default: "")
-- **database**: destination database name (string, required if url is not set)
+- **database**: destination database name (string, required if url is not set or insert_method is "oci")
 - **url**: URL of the JDBC connection (string, optional)
 - **table**: destination table name (string, required)
 - **mode**: "replace" or "insert" (string, required)
+- **insert_method**: see below
 - **batch_size**: size of a single batch insert (integer, default: 16777216)
 - **options**: extra connection properties (hash, default: {})
 
+insert_method supports three options.
 
+"normal" means normal insert (default). It requires Oracle JDBC driver.
+
+"direct" means direct path insert. It is faster than 'normal.
+It requires Oracle JDBC driver too, but the version 12 driver doesn't work (the version 11 driver works).
+
+"oci" means direct path insert using OCI(Oracle Call Interface). It is fastest.
+It requires both Oracle JDBC driver and Oracle Instant Client (version 12.1.0.2.0).
+You must set the library loading path to the OCI library.
+
+If you use "oci", platform dependent library written in cpp is required.
+Windows(x64) library and Linux(x64) are bundled, but others are not bundled.
+You should build by yourself and set the library loading path to it.
+
+
 ### Example
 
 ```yaml
 out:
   type: oracle
@@ -35,12 +51,17 @@
   user: root
   password: ""
   database: my_database
   table: my_table
   mode: insert
+  insert_method: direct
 ```
 
 ### Build
 
 ```
 $ ./gradlew gem
 ```
+
+For Windows(x64), you can build cpp library by "src/main/cpp/win/build.bat".
+
+For Linux, you can build cpp library by "src/main/cpp/linux/build.sh".