| ***************************** |
| Tajo Shell (TSQL) |
| ***************************** |
| |
| ========== |
| Synopsis |
| ========== |
| |
| .. code-block:: bash |
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| bin/tsql [options] |
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| Options |
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| * ``-c "quoted sql"`` : Execute quoted sql statements, and then the shell will exist. |
| * ``-f filename (--file filename)`` : Use the file named filename as the source of commands instead of interactive shell. |
| * ``-h hostname (--host hostname)`` : Specifies the host name of the machine on which the Tajo master is running. |
| * ``-p port (--port port)`` : Specifies the TCP port. If it is not set, the port will be 26002 in default. |
| |
| =================== |
| Entering tsql shell |
| =================== |
| |
| If the hostname and the port num are not given, tsql will try to connect the Tajo master specified in ${TAJO_HOME}/conf/tajo-site.xml. :: |
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| bin/tsql |
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| tajo> |
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| If you want to connect a specified TajoMaster, you should use '-h' and (or) 'p' options as follows: :: |
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| bin/tsql -h localhost -p 9004 |
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| tajo> |
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| =================== |
| Meta Commands |
| =================== |
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| In tsql, anything command that begins with an unquoted backslash ('\') is a tsql meta-command that is processed by tsql itself. |
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| In the current implementation, there are meta commands as follows: :: |
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| tajo> \? |
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| General |
| \copyright show Apache License 2.0 |
| \version show Tajo version |
| \? show help |
| \q quit tsql |
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| Informational |
| \d list tables |
| \d NAME describe table |
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| Documentations |
| tsql guide http://wiki.apache.org/tajo/tsql |
| Query language http://wiki.apache.org/tajo/QueryLanguage |
| Functions http://wiki.apache.org/tajo/Functions |
| Backup & restore http://wiki.apache.org/tajo/BackupAndRestore |
| Configuration http://wiki.apache.org/tajo/Configuration |
| |
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| ================ |
| Examples |
| ================ |
| |
| If you want to list all table names, use '\d' meta command as follows: :: |
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| tajo> \d |
| customer |
| lineitem |
| nation |
| orders |
| part |
| partsupp |
| region |
| supplier |
| |
| Now look at the table description: :: |
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| tajo> \d orders |
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| table name: orders |
| table path: hdfs:/xxx/xxx/tpch/orders |
| store type: CSV |
| number of rows: 0 |
| volume (bytes): 172.0 MB |
| schema: |
| o_orderkey INT8 |
| o_custkey INT8 |
| o_orderstatus TEXT |
| o_totalprice FLOAT8 |
| o_orderdate TEXT |
| o_orderpriority TEXT |
| o_clerk TEXT |
| o_shippriority INT4 |
| o_comment TEXT |
