Failed to execute 'transaction' on ' IDBDatabase': The database connection is closing

[mojoaxel]

In Chrome sometimes the following error appears:

Failed to execute 'transaction' on ' IDBDatabase': The database connection is closing

Sadly to this point I can not say in which line of code because it is hard to reproduce this.

[mojoaxel]

see also

• destroy() race condition causing IndexedDB to hang apache/pouchdb#3415 (comment)
• Sync error after disconnect remotestorage/remotestorage.js#939
• https://stackoverflow.com/questions/27201761/indexeddb-deletedatabase-throws-error
• https://bugs.chromium.org/p/chromium/issues/detail?id=146284

[jensarps]

Thanks for reporting this! And, sorry for the late reply.

Are you deleting a database before the error occurs? Because this is the only place where IDBWrapper closes a connection. If not, it would look like some "accidental closing".

[mojoaxel]

Are you deleting a database before the error occurs? Because this is the only place where IDBWrapper closes a connection. If not, it would look like some "accidental closing".

I cannot reproduce it yet, but It happend sometimes with a client.
After reading a lot about it I think it is a Chrome bug. maybe Chrome closes the Connection after a given time, or if low on memory or something...
The only thing that could help here is a better Error Handling in IDBWrapper, but I don't know where to put it.

@jensarps At the moment I'm waiting it the problem still exists in current Chrome versions. If so I'll come back to you.

[jensarps]

If it was indeed Chrome closing the connection by itself, the only way to guard against that would be to check the connection before every transaction – which is something I'd rather not do.

So, let's wait and see if the issue still exists – and hope for the best :)

[rogervolz]

'POSTS' to 'posts'

[joesleiman]

@jensarps how can i fix this problem if i deleted the database from chrome application tools?

[amrendra007]

Same thing is keep happening to me. when you will try to access the indexDb store before it gets ready this error will arise.

[Taygair]

Just stumbled over this thread: I have the same problem in Safari 12.0.1 (13606.2.104.1.2) and Chrome (Version 70.0.3538.102 (Offizieller Build) (64-Bit) - both Mac:
[Error] Unhandled Promise Rejection: InvalidStateError: Failed to execute 'transaction' on 'IDBDatabase': The database connection is closing.

I got the error when recreating/reopening the IDB.

I am explicitly closing/droping the indexedDB when the user logs out and got this error message when the user logs in (where the DB will be recreated/opened). Even the error message shows up I can access the IDB after recreation. This is the code on logout (no error message on this):

`function dbDrop() {

db.close();

var request = indexedDB.deleteDatabase('gameDB');

request.onsuccess = function () {
    console.log ("done");
};

request.onerror = function () {
    alert ("fehler");
};

request.onblocked = function () {
    alert ("fehler");
};

}`

Firefox (Mac) is the only browser that doesn't show the message above on re-login.

[amrendra007]

I am solving it this way. Just to help in case anyone still has this same problem

.

[rupert-huelsey-tally]

Hi,

Glad I found that thread since we are running into that issue. We put a good amount of analysis and tracking on this - some of our numbers are in this spreadsheet - and these are our findings:

1. It happens only on iOS and Safari/Safari Web Kit
2. A spot check of reporting IPs in the source data set seems to point to this issue being limited to cellular connections
3. It seems that the clients can't really recover from this (although this might be specific to our implementation)

I will check out the recommendations for fixes above and report back.

Any ideas of anyone needs more data feel free to hit me up.

R.