Cleaning Up Amibroker Database

Cleaning up Amibroker Database

I recently messed up my EOD database while trying to setup a r eal-time data feed for some of the t he stocks I track. Well, I had the EOD database open in one instance (instance 1 – EOD) and in another instance of Amibroker (instance 2 – RTCash), I setup a Real-time data feed from Yahoo/Google finance (through Amiquote). What I initially thought as not working turned out to be a nightmare for few days/weeks for me – because the real-time data read re ad from Yahoo/Google was written to t he first instance of Amibroker. Attached is a screenshot of the Quote Editor in Amibroker. See those minute-by-minute quotes – those are the real-time data and the ones with “EOD” in the last column in the screenshot denote the EOD entries for the scrip.

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And with that, my EOD database had RT data for a month or so. Naturally, the EOD charts were all over the place! Since I’d set up the RT data only for about 100 o dd symbols, cleaning it manually wasn’t an option. Last good backup was a month old and I could have restored it in no time, time, but I was really keen on finding a solution for the problem at hand. Help came through Google where I found the script (attached in the document) that cleans up the data using Jscript. Very nifty way of doing this, I must say!

Before you run the script, do the following

1. Take a back-up of your corrupt Amibroker database. In c ase something goes wrong during script execution, you can restore it using this back-up. You can delete this back-up once the script runs successfully. 2. A script file that runs in Windows (See attachment section) 3. Administrator privileges on your computer. 4. Run Command Prompt in “Administrator” mode. Right click on Command Prompt and click on “Run as Administrator” Administrator” option.

5. Check the path settings in the script file is pointing to the folder where y ou Amibroker database resides 6. Change the date range for which you want the data to be deleted from your database.

During script execution, please ensure

1. Amibroker is not open in your computer. 2. No other program is accessing the database (WinZip, WinRAR – in case you are taking a back-up) 3. Wait patiently for the message “Clean -up ended”!! Depending on the date range, the cleanup can take time. I had to run the clean-up for range of 10 days and it took nearly 10 -12 minutes!! So, get a coffee/tea while the script is in progress. Note – Note – When the script is in progress, in your Task Manager, you’ll notice a “Broker.exe” instance running. That’s an Amibroker instance used by the script. DO NOT terminate that! Attachments

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Note – Note – I downloaded the script through a Google search and I thank that person for posting the script

online – Kudos to him/her! However, there were no specific instructions on how to run the script etc. So, the only credit I take is for the documentation here 