Ashley Book of Knots by Clifford Ashley

By Clifford Ashley

Describes each functional knot, what it appears like, the place it comes from, and the way to tie it. The booklet contains 4,000 knots, with all of the kinds of shipboard knots in addition to knots utilized by butchers, steeplejacks, electrical linesmen, knitters, cobblers, surgeons, poachers and cowboys.

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Com" } } You must always use a $ modifier for adding, changing, or removing keys. update(criteria, {"foo" : "bar"}) This will not function as intended. It actually does a full-document replacement, replacing the matched document with {"foo" : "bar"}. Always use $ operators for modifying individual key/value pairs. Incrementing and decrementing The "$inc" modifier can be used to change the value for an existing key or to create a new key if it does not already exist. It is very useful for updating analytics, karma, votes, or anything else that has a changeable, numeric value.

Sending dozens, hundreds, or even thousands of documents at a time can make inserts significantly faster. A batch insert is a single TCP request, meaning that you do not incur the overhead of doing hundreds of individual requests. It can also cut insert time by eliminating a lot of the header processing that gets done for each message. When an individual document is sent to the database, it is prefixed by a header that tells the 23 database to do an insert operation on a certain collection. By using batch insert, the database doesn’t need to reprocess this information for each document.

Thus, if John had left more than one comment, his name would be changed only for the first comment he left. Modifier speed Some modifiers are faster than others. $inc modifies a document in place: it does not have to change the size of a document, only the value of a key, so it is very efficient. On the other hand, array modifiers might change the size of a document and can be slow. ) MongoDB leaves some padding around a document to allow for changes in size (and, in fact, figures out how much documents usually change in size and adjusts the amount of padding it leaves accordingly), but it will eventually have to allocate new space for a document if you make it much larger than it was originally.

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