Import Data

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CockroachDB supports importing data from .sql dumps and some .csv files.

Import from Generic SQL Dump

You can execute batches of INSERT statements stored in .sql files (including those generated by cockroach dump) from the command line, importing data into your cluster.

$ cockroach sql --database=[database name] < statements.sql

Import from PostgreSQL Dump

If you're importing data from a PostgreSQL deployment, you can import the .sql file generated by the pg_dump command to more quickly import data.

Create PostgreSQL SQL File

Which pg_dump command you want to use depends on whether you want to import your entire database or only specific tables:

• Entire database:

  $ pg_dump [database] > [filename].sql
  

• Specific tables:

  $ pg_dump -t [table] [table's schema] > [filename].sql
  

For more details, see PostgreSQL's documentation on pg_dump.

Reformat SQL File

After generating the .sql file, you need to perform a few editing steps before importing it:

1. Remove all statements from the file besides the CREATE TABLE and COPY statements.
2. Manually add the table's PRIMARY KEY constraint to the CREATE TABLE statement. This has to be done manually because PostgreSQL attempts to add the primary key after creating the table, but CockroachDB requires the primary key be defined upon table creation.
3. Review any other constraints to ensure they're properly listed on the table.
4. Remove any unsupported elements, such as arrays.

Import Data

After reformatting the file, you can import it through psql:

$ psql -p [port] -h [node host] -d [database] -U [user] < [file name].sql

For reference, CockroachDB uses these defaults:

• [port]: 26257
• [user]: root

Import from CSV

You can import numeric data stored in .csv files by executing a bash script that reads values from the files and uses them in INSERT statements.

Template

This template reads 3 columns of numerical data, and converts them into INSERT statements, but you can easily adapt the variables (a, b, c) to any number of columns.

> \| IFS=","; while read a b c; do echo "INSERT INTO csv VALUES ($a, $b, $c);"; done < test.csv;

Example

In this SQL shell example, use \! to look at the rows in a CSV file before creating a table and then using \| to insert those rows into the table.

> \! cat test.csv

12, 13, 14
10, 20, 30

> CREATE TABLE csv (x INT, y INT, z INT);

> \| IFS=","; while read a b c; do echo "INSERT INTO csv VALUES ($a, $b, $c);"; done < test.csv;

> SELECT * FROM csv;

+----+----+----+
| x  | y  | z  |
+----+----+----+
| 12 | 13 | 14 |
| 10 | 20 | 30 |
+----+----+----+

See Also

• SQL Dump (Export)
• Back up Data
• Restore Data
• Use the Built-in SQL Client
• Other Cockroach Commands

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