MySQL

MySQL is a managed database service for deploying cloud-native applications.

Prerequisites

Ensure that you have the following details before configuring MySQL as a source:

• Hostname or IP address
• Port
• Outbound port (3306 is the default port) open in your AWS or Azure security group

Configuring MySQL as a Source

Perform these steps to configure MySQL as a source:

1. On the Datasets page, you can see a truncated list of Sources at the bottom-left of the page. Click Add Source.

   Alternatively, select Databases in the Data panel. The page displays all database sources. Click the Add database button at the top-right corner of that page.

2. In the Add Data Source dialog, click MySQL.

   The following section describes the source configuration settings in the New MySQL Source dialog.

   note

   Sources containing a large number of files or tables may take longer to be added. During this time, the source name is grayed out and shows a spinner icon, indicating the source is being added. Once complete, the source becomes accessible.

General

Under General in the sidebar, complete the following steps:

1. For Name, enter a name. The name cannot include the following special characters: /, :, [, or ].

2. For Host, enter the MySQL host name.

3. For Port, enter the MySQL port number. The default port is 3306.

4. (Optional) For Database, enter the MySQL database name.

5. For Authentication, choose one of the following options:

   a. Select No Authentication to not provide credentials.

   b. Select Master Credentials to provide the username and password of a master database user with permissions to read required objects:

   • For Username, enter your MySQL database username.
   • For Password, enter your MySQL database password.

Advanced Options

(Optional) Select Advanced Options in the sidebar and change any of the following settings:

Advanced Option	Description
Net write timeout (in seconds)	Seconds to wait for data from the server before aborting the connection. The default timeout is 60 seconds.
Record fetch size	Number of records to fetch at once. Set to 0 (zero) to have Sonar automatically decide. The default record fetch size is 200.
Maximum Idle Connections	The total number of connections allowed to be idle at a given time. The default maximum idle connections is 8.
Connection idle time (s)	The amount of time (in seconds) allowed for a connection to remain idle before the connection is terminated. The default connection idle time is 60 seconds.
Query timeout (s)	The amount of time (in seconds) for the query to be executed before it is canceled.
Properties	Custom key value pairs for the connection relevant to the source. To add a connection property, click Add property and add the property name and value.

Reflection Refresh

Select Reflection Refresh in the sidebar and set time intervals for Reflections to refresh or expire.

Metadata

(Optional) Select Metadata in the sidebar and complete the following steps:

1. Select Remove dataset definitions if underlying data is unavailable. By default, Sonar removes dataset definitions if underlying data is unavailable. This can be useful when files are temporarily deleted and added back in the same location with new sets of files.

2. Set the following Metadata Refresh parameters:

Parameter	Description	Field	Setting
Dataset Discovery	The refresh interval for fetching top-level source object names such as databases and tables.	Fetch every	You can choose to set the frequency to fetch object names in minutes, hours, days, or weeks. The default frequency to fetch object names is 1 hour.
Dataset Details	The metadata that Sonar needs for query planning such as information required for fields, types, shards, statistics, and locality. These are the parameters to fetch the dataset information.	Fetch mode	You can choose to fetch only from queried datasets that are set by default. Sonar updates details for previously queried objects in a source. Fetching from all datasets is deprecated.
		Fetch every	You can choose to set the frequency to fetch dataset details in minutes, hours, days, or weeks. The default frequency to fetch dataset details is 1 hour.
		Expire after	You can choose to set the expire time of dataset details in minutes, hours, days, or weeks. The default expiry time of dataset details is 3 hours.

Privileges

(Optional) Select Privileges in the sidebar and grant privileges to specific users or roles by completing the following steps:

1. For Privileges, enter the user name or role name that you want to grant access to and click the Add to Privileges button. The added user or role is displayed in the Users table.
2. For the users or roles in the Users table, toggle the green checkmark for each privilege you want to grant to the MySQL source that is being created.
3. Click Save.

Editing a MySQL Source

To edit a MySQL source:

1. On the Database page, click Databases. A list of databases is displayed.

2. Hover over the database and click the Settings icon that appears next to the source.

3. In the Source Settings dialog, you cannot edit the name. Editing other parameters is optional.

4. Click Save.

Removing a MySQL Source

To remove a MySQL source, perform these steps:

1. On the Datasets page, click Databases. A list of sources is displayed.

2. Hover over the source and click the More (...) icon that appears next to the source.

3. From the list of actions, click Remove Source. Confirm that you want to remove the source.

   caution

   Removing a source causes all downstream views dependent on objects in this source to break.

   note

   Sources containing a large number of files or tables may take longer to be removed. During this time, the source name is grayed out and shows a spinner icon, indicating the source is being removed. Once complete, the source disappears.

Predicate Pushdowns

Dremio offloads these operations to MySQL.

*, +, -, /, %
<, <=, <>, =, >, >=, !=
AND, NOT, NOT LIKE, OR, ||
ABS
ACOS
ADD_MONTHS
ASIN
ATAN
ATAN2
AVG
CAST
CEIL
CEILING
CHAR_LENGTH
CHARACTER_LENGTH
CONCAT
COS
COT
CURRENT_DATE
CURRENT_TIME
CURRENT_TIMESTAMP
DATE_ADD
DATE_SUB
DATE_TRUNC_DAY
DATE_TRUNC_DECADE
DATE_TRUNC_HOUR
DATE_TRUNC_MINUTE
DATE_TRUNC_MONTH
DATE_TRUNC_SECOND
DATE_TRUNC_WEEK
DATE_TRUNC_YEAR
DEGREES
E
EXP
EXTRACT_DAY
EXTRACT_DOW
EXTRACT_DOY
EXTRACT_HOUR
EXTRACT_MINUTE
EXTRACT_MONTH
EXTRACT_QUARTER
EXTRACT_SECOND
EXTRACT_WEEK
EXTRACT_YEAR
FLOOR
IS DISTINCT FROM
IS NOT DISTINCT FROM
IS NOT NULL
IS NULL
LAST_DAY
LCASE
LEFT
LENGTH
LIKE
LN
LOCATE
LOG
LOG10
LOWER
LPAD
LTRIM
MAX
MIN
MOD
PI
POSITION
POW
POWER
RADIANS
RAND
REPLACE
REVERSE
RIGHT
ROUND
RPAD
RTRIM
SIGN
SIN
SQRT
STDDEV
STDDEV_POP
STDDEV_SAMP
SUBSTR
SUBSTRING
SUM
TAN
TIMESTAMPADD_DAY
TIMESTAMPADD_HOUR
TIMESTAMPADD_MINUTE
TIMESTAMPADD_MONTH
TIMESTAMPADD_QUARTER
TIMESTAMPADD_SECOND
TIMESTAMPADD_YEAR
TIMESTAMPDIFF_DAY
TIMESTAMPDIFF_HOUR
TIMESTAMPDIFF_MINUTE
TIMESTAMPDIFF_MONTH
TIMESTAMPDIFF_QUARTER
TIMESTAMPDIFF_SECOND
TIMESTAMPDIFF_WEEK
TIMESTAMPDIFF_YEAR
TO_DATE
TRIM
TRUNC
TRUNCATE
UCASE
UPPER
VAR_POP
VAR_SAMP