Sfrgttk

Time travel alters history but people keep saying nothing's changed

Is "plugging out" electronic devices an American expression?

Why hard-Brexiteers don't insist on a hard border to prevent illegal immigration after Brexit?

Can someone be penalized for an "unlawful" act if no penalty is specified?

Shouldn't "much" here be used instead of "more"?

Why did Acorn's A3000 have red function keys?

Is a "Democratic" Oligarchy-Style System Possible?

Right tool to dig six foot holes?

Are there any other methods to apply to solving simultaneous equations?

Earliest use of the term "Galois extension"?

Why is the maximum length of OpenWrt’s root password 8 characters?

How technical should a Scrum Master be to effectively remove impediments?

Why do we hear so much about the Trump administration deciding to impose and then remove tariffs?

How come people say “Would of”?

Did Scotland spend $250,000 for the slogan "Welcome to Scotland"?

Is bread bad for ducks?

Why didn't the Event Horizon Telescope team mention Sagittarius A*?

Did Section 31 appear in Star Trek: The Next Generation?

Geography at the pixel level

Delete all lines which don't have n characters before delimiter

Am I thawing this London Broil safely?

Can we generate random numbers using irrational numbers like π and e?

Have you ever entered Singapore using a different passport or name?

If I score a critical hit on an 18 or higher, what are my chances of getting a critical hit if I roll 3d20?

In MongoDB serverStatus(), what is the meaning of “connection data handles currently active”?

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}

0

When running db.serverStatus() in the MongoDB shell (3.4, WiredTiger), the results contain the following data:

{

    "connection data handles currently active" : 94862,

    "connection sweep candidate became referenced" : 0,

    "connection sweep dhandles closed" : 91885,

    "connection sweep dhandles removed from hash list" : 648514,

    "connection sweep time-of-death sets" : 1514067,

    "connection sweeps" : 40077,

    "session dhandles swept" : 110175,

    "session sweep attempts" : 710643

}

What is the meaning of "connection data handles currently active"? Does it have an impact on the instance's performance?

mongodb mongodb-3.4 wiredtiger

share|improve this question

asked Sep 19 '17 at 10:46

TzachTzach

1727

bumped to the homepage by Community♦ 15 mins ago

This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Good question... Checking wiredTiger source code from GitHub I could found only one hit /*! data-handle: connection data handles currently active */ #define WT_STAT_CONN_DH_CONN_HANDLE_COUNT 1131 no code lines what would explain how that value is count.
  
  – JJussi
  Sep 19 '17 at 11:09
  

  
  
  
  

add a comment | 

0

When running db.serverStatus() in the MongoDB shell (3.4, WiredTiger), the results contain the following data:

{

    "connection data handles currently active" : 94862,

    "connection sweep candidate became referenced" : 0,

    "connection sweep dhandles closed" : 91885,

    "connection sweep dhandles removed from hash list" : 648514,

    "connection sweep time-of-death sets" : 1514067,

    "connection sweeps" : 40077,

    "session dhandles swept" : 110175,

    "session sweep attempts" : 710643

}

What is the meaning of "connection data handles currently active"? Does it have an impact on the instance's performance?

mongodb mongodb-3.4 wiredtiger

share|improve this question

asked Sep 19 '17 at 10:46

TzachTzach

1727

bumped to the homepage by Community♦ 15 mins ago

This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Good question... Checking wiredTiger source code from GitHub I could found only one hit /*! data-handle: connection data handles currently active */ #define WT_STAT_CONN_DH_CONN_HANDLE_COUNT 1131 no code lines what would explain how that value is count.
  
  – JJussi
  Sep 19 '17 at 11:09
  

  
  
  
  

add a comment | 

When running db.serverStatus() in the MongoDB shell (3.4, WiredTiger), the results contain the following data:

{

    "connection data handles currently active" : 94862,

    "connection sweep candidate became referenced" : 0,

    "connection sweep dhandles closed" : 91885,

    "connection sweep dhandles removed from hash list" : 648514,

    "connection sweep time-of-death sets" : 1514067,

    "connection sweeps" : 40077,

    "session dhandles swept" : 110175,

    "session sweep attempts" : 710643

}

What is the meaning of "connection data handles currently active"? Does it have an impact on the instance's performance?

mongodb mongodb-3.4 wiredtiger

share|improve this question

asked Sep 19 '17 at 10:46

TzachTzach

1727

{

    "connection data handles currently active" : 94862,

    "connection sweep candidate became referenced" : 0,

    "connection sweep dhandles closed" : 91885,

    "connection sweep dhandles removed from hash list" : 648514,

    "connection sweep time-of-death sets" : 1514067,

    "connection sweeps" : 40077,

    "session dhandles swept" : 110175,

    "session sweep attempts" : 710643

}

share|improve this question

asked Sep 19 '17 at 10:46

TzachTzach

1727

share|improve this question

asked Sep 19 '17 at 10:46

TzachTzach

1727

asked Sep 19 '17 at 10:46

TzachTzach

1727

asked Sep 19 '17 at 10:46

TzachTzach

1727

1 Answer
1

active

oldest

votes

0

Although I can't find any evidence for that in the documentation, it is probably the open file-handles that Mongo holds against the file storage.

I did a test that supports this idea:

1. Creating new mongodb instance, "connection data handles currently active" minimum value is 11 (sometimes it becomes 12,13 and then back to 11).


2. db.coll.insert({"foo":"bar"}) - "connection data handles currently active" min value = 13.

I did the same with other operations that cause mongo to create new files on disk, such as index creation, and I have noticed the same behavior.
We can conclude that this value, "connection data handles currently active" is related to the number of file-handles that mongo holds.

As for the question if it has an impact on the instance's performance, in some cases it could be true according to the next discussion at Jira:
https://jira.mongodb.org/browse/SERVER-27700

share|improve this answer

edited Sep 19 '17 at 17:11

RDFozz

9,89731531

answered Sep 19 '17 at 16:26

Idan CohenIdan Cohen

1

add a comment | 

Your Answer

StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "182"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});

function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});


}
});

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Sign up using Google

Sign up using Facebook

Sign up using Email and Password

Post as a guest

Name

Email

Required, but never shown

StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fdba.stackexchange.com%2fquestions%2f186300%2fin-mongodb-serverstatus-what-is-the-meaning-of-connection-data-handles-curre%23new-answer', 'question_page');
}
);

Post as a guest

Name

Email

Required, but never shown

0

Although I can't find any evidence for that in the documentation, it is probably the open file-handles that Mongo holds against the file storage.

I did a test that supports this idea:

1. Creating new mongodb instance, "connection data handles currently active" minimum value is 11 (sometimes it becomes 12,13 and then back to 11).


2. db.coll.insert({"foo":"bar"}) - "connection data handles currently active" min value = 13.

I did the same with other operations that cause mongo to create new files on disk, such as index creation, and I have noticed the same behavior.
We can conclude that this value, "connection data handles currently active" is related to the number of file-handles that mongo holds.

As for the question if it has an impact on the instance's performance, in some cases it could be true according to the next discussion at Jira:
https://jira.mongodb.org/browse/SERVER-27700

share|improve this answer

edited Sep 19 '17 at 17:11

RDFozz

9,89731531

answered Sep 19 '17 at 16:26

Idan CohenIdan Cohen

1

add a comment | 

0

Although I can't find any evidence for that in the documentation, it is probably the open file-handles that Mongo holds against the file storage.

I did a test that supports this idea:

1. Creating new mongodb instance, "connection data handles currently active" minimum value is 11 (sometimes it becomes 12,13 and then back to 11).


2. db.coll.insert({"foo":"bar"}) - "connection data handles currently active" min value = 13.

I did the same with other operations that cause mongo to create new files on disk, such as index creation, and I have noticed the same behavior.
We can conclude that this value, "connection data handles currently active" is related to the number of file-handles that mongo holds.

As for the question if it has an impact on the instance's performance, in some cases it could be true according to the next discussion at Jira:
https://jira.mongodb.org/browse/SERVER-27700

share|improve this answer

edited Sep 19 '17 at 17:11

RDFozz

9,89731531

answered Sep 19 '17 at 16:26

Idan CohenIdan Cohen

1

add a comment | 

Although I can't find any evidence for that in the documentation, it is probably the open file-handles that Mongo holds against the file storage.

I did a test that supports this idea:

1. Creating new mongodb instance, "connection data handles currently active" minimum value is 11 (sometimes it becomes 12,13 and then back to 11).


2. db.coll.insert({"foo":"bar"}) - "connection data handles currently active" min value = 13.

I did the same with other operations that cause mongo to create new files on disk, such as index creation, and I have noticed the same behavior.
We can conclude that this value, "connection data handles currently active" is related to the number of file-handles that mongo holds.

As for the question if it has an impact on the instance's performance, in some cases it could be true according to the next discussion at Jira:
https://jira.mongodb.org/browse/SERVER-27700

share|improve this answer

edited Sep 19 '17 at 17:11

RDFozz

9,89731531

answered Sep 19 '17 at 16:26

Idan CohenIdan Cohen

1

share|improve this answer

edited Sep 19 '17 at 17:11

RDFozz

9,89731531

answered Sep 19 '17 at 16:26

Idan CohenIdan Cohen

1

edited Sep 19 '17 at 17:11

RDFozz

9,89731531

edited Sep 19 '17 at 17:11

RDFozz

9,89731531

answered Sep 19 '17 at 16:26

Idan CohenIdan Cohen

1

answered Sep 19 '17 at 16:26

Idan CohenIdan Cohen

1