- #Json compare table column format how to
- #Json compare table column format upgrade
Saving arbitrary key/value user preferences. 
When storing email addresses and phone numbers for a contact, where storing them as values in a JSON array is much easier to manage than multiple separate tables. This concludes our tutorial on how to add an index on JSON values.
This will show the result in the following way Table: table1 Non_unique: 0 Key_name: TABLE1_ID_INDEX Seq_in_index: 1 Column_name: id Collation: A Cardinality: 3 Sub_part: NULL Packed: NULL Null: YES Index_type: BTREE Comment: Index_comment: SHOW INDEXES FROM table1 \G #\G returns data formatted in expanded mode. To check the current indexes on the table use the following command. CREATE UNIQUE INDEX TABLE1_ID_INDEX ON table1 (id)
JSON Object:- A JSON object contains a set of key-value pairs separated by commas and enclosed within | 3 | +-+-+. JSON array:- A JSON array contains a list of values separated by commas and enclosed within characters. It was developed as a lightweight format for storing and transporting data. JSON stands for ( JavaScript Object Notation) So many of you will know what JSON data types are. Which defaults to the 4MB and can be extended up to 1GB. This in fact depends upon the max_allowed_packet system variable. The space required to store the MySQL JSON type is the same as LONGTEXT or LONGBLOB type. So if you have an upgraded version of MySQL you can refer to this guide to do so.Įarlier MySQL provided support for storing JSON encoded stings but having JSON support in the database gives a few advantages over storing JSON encoded strings. MySQL started supporting the native JSON data type defined by RFC 7159 that enables efficient access to data in JSON from version 5.7.8. The references to what I will be writing here can be found in the MySQL bible. We found a few important pieces of information about JSON handling and storage limits which are described below. 
While the database up-gradation was going, we parallelly started implementing JSON datatype in the development environment. The 1mg DevOps team handled the data migration and up-gradation of the MySQL database on AWS pretty well.
Migrate the data from the old MySQL to the new one.
Upgrade the MySQL from our current version 5.6 to minimal version 5.7.8 that supports JSON.
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