btree | lock free modified prefix Btree append-only database | Database library

by OrangeTide C Version: Current License: No License

X-Ray Key Features Code Snippets(3)Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | btree Summary

btree is a C library typically used in Database applications. btree has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

lock free modified prefix B+tree append-only database

Support

Quality

Security

License

Reuse

Support

btree has a low active ecosystem.

It has 101 star(s) with 21 fork(s). There are 7 watchers for this library.

It had no major release in the last 6 months.

There are 0 open issues and 1 have been closed. On average issues are closed in 2577 days. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of btree is current.

Quality

btree has 0 bugs and 0 code smells.

Security

btree has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

btree code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

btree does not have a standard license declared.

Check the repository for any license declaration and review the terms closely.

Without a license, all rights are reserved, and you cannot use the library in your applications.

Reuse

btree releases are not available. You will need to build from source code and install.

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btree Key Features

No Key Features are available at this moment for btree.

btree Examples and Code Snippets

Creates a BTree .

javascript

Lines of Code : 19

License : Non-SPDX (Apache License 2.0)

Copy

function BTree(minimumDegree) {
	/**
	 * The root of the tree.
	 * @type {BNode}
	 */
	this.root = new BNode();

	/**
	 * The minimum number of the keys of a node.
	 * @type {number}
	 */
	this.t = minimumDegree;

	/**
	 * The number of items stored

Btree .

javascript

Lines of Code : 7

License : Non-SPDX (Apache License 2.0)

Copy

function BSTree() {
	/**
	 * The root of the tree.
	 * @type {BSNode|null}
	 */
	this.root = null;
}

Validates a BT B BTree .

javascript

Lines of Code : 4

License : No License

Copy

function validateBalancedBT_3(tree) {
  if (!tree || !tree.root) return true;
  return checkHeight(tree.root) !== Number.MIN_SAFE_INTEGER;
}

Community Discussions

Trending Discussions on btree

SQL filter table based on two cell values

postgresql change index order

Optimize query with functions in `group by` key?

Postgres choosing a query plan that is more expensive by its own estimates

How to create a subrange of a BTreeSet<(String, String, String)>? How to turn a tuple of bounds into a bound of a tuple?

MySQL SQL Performance need some improvement

Is there a other way to use Maybe on my path search function through the BTree? (Haskell)

Capturing group regex with grep

Print Binary Search Tree in a tree like structure in Haskell

Polymorphic variants and constructors

QUESTION

SQL filter table based on two cell values

Asked 2022-Mar-14 at 21:37

I have a table with contact details “lead” and another table with information about emails which have been sent to the leads “mail_log”

I want to get all leads which have received mail_id = 1 but not mail_id = 2. And the lead should not be deleted = 1. And the timestamp of mail_id 1 sould be more then one week ago

As result I need the email address of the lead and the date when the last mail was sent (in this case mail_id 1)

Thank you

...

ANSWER

Answered 2022-Mar-14 at 21:32

select l.email,
       ml.timestamp
from lead l
join mail_log ml on l.id = ml.lead_id
where l.deleted <> 1
    and ml.mail_id = 1
    and ml.timestamp < DATEADD(day, -7, CAST(GETDATE() AS date))

Source https://stackoverflow.com/questions/71474060

QUESTION

postgresql change index order

Asked 2022-Mar-08 at 14:33

I created an index as follows:

...

ANSWER

Answered 2022-Mar-08 at 14:33

I'm afraid the only thing to do is to remove the index

Don't be afraid, You can do it without any downtime :

first create your new index in the good order, but with CONCURRENTLY to avoid any lock,
then, drop the old index.

No lock, and no query without index, with the only downside of having a 2n index size while you do the change.

Source https://stackoverflow.com/questions/71349948

QUESTION

Optimize query with functions in `group by` key?

Asked 2022-Feb-21 at 18:43

I am using MySQL 8.0 and there is a slow query on a large table to be optimized.

The table contains 11 million rows of data and it's structure:

...

ANSWER

Answered 2022-Feb-21 at 05:15

I was able to eliminate the Using temporary by adding an expression index:

Source https://stackoverflow.com/questions/71201287

QUESTION

Postgres choosing a query plan that is more expensive by its own estimates

Asked 2022-Feb-17 at 17:25

I have the following 2 query plans for a particular query (second one was obtained by turning seqscan off):

The cost estimate for the second plan is lower than that for the first, however, pg only chooses the second plan if forced to do so (by turning seqscan off).

What could be causing this behaviour?

EDIT: Updating the question with information requested in a comment:

Output for EXPLAIN (ANALYZE, BUFFERS, VERBOSE) for query 1 (seqscan on; does not use index). Also viewable at https://explain.depesz.com/s/cGLY:

...

ANSWER

Answered 2022-Feb-17 at 11:43

You should have those two indexes to speed up your query :

Source https://stackoverflow.com/questions/71154089

QUESTION

How to create a subrange of a BTreeSet<(String, String, String)>? How to turn a tuple of bounds into a bound of a tuple?

Asked 2022-Jan-21 at 10:45

I am trying to use a BTreeSet<(String, String, String)> as a way to create a simple in-memory 'triple store'.

To be precise:

...

ANSWER

Answered 2022-Jan-17 at 09:59

I'd like to be able to build range-queries for all of the following:

Source https://stackoverflow.com/questions/70626847

QUESTION

MySQL SQL Performance need some improvement

Asked 2022-Jan-13 at 01:35

I have worked my way around many challenges with MySQL, and i think right now i am able to build everything that i need, to get something to work. But now, for a pretty huge SQL statement that returns a lot of data, i need to work on MySQL performance for the first time.

I was hoping someone here could help me find out why the following statement is so incredibly slow. It takes over 3 minutes to collect 740 results out of different tables. The biggest table beeing the "reports" table, consisting of somewhere over 20.000 entries at the moment.

I can also educate myself if someone could just point me in the right direction. I don't even know where to search for answers for my current problem.

Okay, so here is the statement that i am talking about. Maybe, if someone has enough experience with SQL performance, something just right away jumps at them. I would be happy for any kind of feedback. I'll elaborate on the statement right after the code itself:

...

ANSWER

Answered 2022-Jan-13 at 01:03

Let's start by adding an index for each of the foreign keys used in your query -

Source https://stackoverflow.com/questions/70685919

QUESTION

Is there a other way to use Maybe on my path search function through the BTree? (Haskell)

Asked 2022-Jan-12 at 16:15

I want to be able to specify an element and the tree and the function should give me a list of directions and if the element is not contained it should not return an error but rather a "Nothing" made by Maybe.

...

ANSWER

Answered 2022-Jan-12 at 16:15

The reason Just (L : getPath y lt) does not work is because getPath y lt is a Maybe [Direction], not a [Direction], hence it is not a list, and you thus can not prepend this with L or R.

You can make use of fmap :: Functor f => (a -> b) -> f a -> f b to perform a mapping on the item wrapped in the Just data constructor, and fmap f Nothing will return Nothing.

You thus can implement this as:

Source https://stackoverflow.com/questions/70684627

QUESTION

Capturing group regex with grep

Asked 2022-Jan-07 at 14:37

I'm trying to capture SQL DDL "CREATE" from a PostgreSQL schema dump that looks like this:

...

ANSWER

Answered 2022-Jan-07 at 10:28

sed would be better tool for this:

Source https://stackoverflow.com/questions/70619735

QUESTION

Print Binary Search Tree in a tree like structure in Haskell

Asked 2022-Jan-02 at 15:47

I created a binary search tree and tried to print the binary search tree with this instance

...

ANSWER

Answered 2022-Jan-01 at 16:17

I found my answer myself. I created one function that shows like that. Here is the code

Source https://stackoverflow.com/questions/70498120

QUESTION

Polymorphic variants and constructors

Asked 2021-Dec-13 at 05:18

I'm just wondering how flexible OCaml's polymorphic variants are.

I know I can use the same constructor across different types but what is meant by the same constructor?

I know its fine to use `Nil here.

...

ANSWER

Answered 2021-Dec-13 at 05:18

You can have the vlist and btree definitions simultaneously. Values built from polymorphic variants are typed according to their structure, so there is no conflict between different uses of the same constructors.

Here is a session showing some possibilities that I tried:

Source https://stackoverflow.com/questions/70329949

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install btree

You can download it from GitHub.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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