diff options
Diffstat (limited to 'lib/stdlib/doc/src')
| -rw-r--r-- | lib/stdlib/doc/src/ets.xml | 20 | ||||
| -rw-r--r-- | lib/stdlib/doc/src/notes.xml | 15 |
2 files changed, 32 insertions, 3 deletions
diff --git a/lib/stdlib/doc/src/ets.xml b/lib/stdlib/doc/src/ets.xml index 7594514b29..d2ac6a75b1 100644 --- a/lib/stdlib/doc/src/ets.xml +++ b/lib/stdlib/doc/src/ets.xml @@ -213,6 +213,21 @@ ets:insert(t, {3}), is not enabled. This can also only be a potential concern for <c>ordered_set</c> where the traversal order is defined.</p> </note> + <p>Traversals using <c>match</c> and <c>select</c> functions may not need to + scan the entire table depending on how the key is specified. A match + pattern with a <em>fully bound key</em> (without any match variables) will + optimize the operation to a single key lookup without any table traversal + at all. For <c>ordered_set</c> a <em>partially bound key</em> will limit the + traversal to only scan a subset of the table based on term order. A + partially bound key is either a list or a tuple with a prefix that is fully + bound. Example:</p> +<pre> +1> <input>T = ets:new(t,[ordered_set]), ets:insert(T, {"555-1234", "John Smith"}).</input> +true +2> <input>%% Efficient search of all with area code 555</input> +2> <input>ets:match(T,{[$5,$5,$5,$- |'$1'],'$2'}).</input> +[["1234","John Smith"]] +</pre> </section> <section> @@ -2023,9 +2038,8 @@ true</pre> <p>This function provides an efficient way to update one or more counters, without the trouble of having to look up an object, update the object by incrementing an element, and insert the resulting - object into the table again. (The update is done atomically, - that is, no process - can access the ETS table in the middle of the operation.)</p> + object into the table again. The operation is guaranteed to be + <seealso marker="#concurrency">atomic and isolated</seealso>.</p> <p>This function destructively update the object with key <c><anno>Key</anno></c> in table <c><anno>Tab</anno></c> by adding <c><anno>Incr</anno></c> to the element at position diff --git a/lib/stdlib/doc/src/notes.xml b/lib/stdlib/doc/src/notes.xml index a682811c6d..dee7136eb1 100644 --- a/lib/stdlib/doc/src/notes.xml +++ b/lib/stdlib/doc/src/notes.xml @@ -31,6 +31,21 @@ </header> <p>This document describes the changes made to the STDLIB application.</p> +<section><title>STDLIB 3.7.1</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> Optimize pretty printing of terms. The slower + behaviour was introduced in Erlang/OTP 20. </p> + <p> + Own Id: OTP-15573 Aux Id: ERIERL-306 </p> + </item> + </list> + </section> + +</section> + <section><title>STDLIB 3.7</title> <section><title>Fixed Bugs and Malfunctions</title> |