MDR data is all quote updates and trade data captured by Cboe’s internal data retrieval systems.
MDR data is offered in the following Cboe exclusive indices: ^VIX, ^SPX and ^OEX. The amount of history available of the data varies by symbol; ^SPX from January 1990, ^OEX-January 1990 and ^VIX-March 2006. The MDR data will be delivered by SFTP.
1 - Before 10/1/19 this column had time in CST, afterwords - milliseconds are added, in EST time zone.
2 - Before 10/1/19 this column had internal sequence number and milliseconds, afterwords - it's OPRA generated sequence number.
3 - Before 10/1/19 this column had condition name, afterwords - condition ID.
4 - Prior to 7/15/2021 there are instances of data points with more than two (2) decimals.