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primarykey
Id
7732491
data
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0
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2011-10-11T21:05:13.233
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2011-10-11T21:05:13.233
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text
Body
In addition to your Pages table, create 3 additional tables with the same columns (PagesInsertA, PagesInsertB and PagesInsertC). When inserting URLs, check against Pages for an existing entry, and if it's not there, insert the URL into PagesInsertA. You can either use a unique index on that smaller table, or include a step to remove duplicates later (discussed below). At the end of your rotation time (perhaps one minute, see discussion below for constraints), switch to inserting new URLs into PagesInsertB. Perform the following steps on PagesInsertA: remove duplicates (if you weren't using a unique index), remove any entries that duplicate entries in PagesInsertC (that table will be empty the first time around, but not the second), add the entries from PagesInsertA to Pages, empty PagesInsertC. At the end of the second period, switch to inserting new URLs into PagesInsertC. Perform the steps discussed above on PagesInsertB (only difference is that you will remove entries also found in PagesInsertA and empty PagesInsertA at the end). Continue the rotation of the table the new URLs are inserted into (A -> B -> C -> A -> ...). A minimum of 3 insert tables is needed because there will be a lag between switching URL insertion to a new insert table and inserting the cleaned-up rows from the previous insert table into Pages. I used 1 minute as the time between switches in this example, but you can make that time smaller as long as the insertion from PagesInsertA to Pages and emptying PagesInsertC (for example), occurs before the switch between inserting new URLs into PagesInsertB and PagesInsertC. 
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Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POPrevent duplicate rows in MySQL without unique index/constraint?
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PostTypePostTypeId
1. PTAnswer
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1. This table or related slice is empty.
UserOwnerUserId
1. USUltraOne
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1. This table or related slice is empty.

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