Currently I have thousand of records and the IDs are pretty long. However I realize there was a big range of difference in the ID eg.(1,2,3,4,5,6,1020,1021,1022,1023)in between the records. I believe this will generated when I deleted 800 of post records at one shot recently. So is there any plugins or solutions out there to clean up and remove all the "unused IDs" in wordpress database.