Is it possible to check if the SQLITE cache is hot or cold?
I have a ~5GB python SQLITE3 database (accessed using SQLalchemy) that is installed on a number of machines with varying architectures. Queries to this database can take dramatically longer (up to 100x) if the SQLite cache is cold.
If I know the cache is cold, I can change the query to make it faster by essentially reading the entire table in chunks and filtering the data I want out of every chunk. However, this changed query will still be slower than the normal query on a hot cache, so I can't use it all the time.
Is there any way to check if the cache is hot or cold using SQLalchemy / SQLITE3?
python sql sqlite sqlite3 sqlalchemy
asked Nov 22 '18 at 11:12
MikeFentonMikeFenton
756
add a comment |
I have a ~5GB python SQLITE3 database (accessed using SQLalchemy) that is installed on a number of machines with varying architectures. Queries to this database can take dramatically longer (up to 100x) if the SQLite cache is cold.
If I know the cache is cold, I can change the query to make it faster by essentially reading the entire table in chunks and filtering the data I want out of every chunk. However, this changed query will still be slower than the normal query on a hot cache, so I can't use it all the time.
Is there any way to check if the cache is hot or cold using SQLalchemy / SQLITE3?
python sql sqlite sqlite3 sqlalchemy
asked Nov 22 '18 at 11:12
MikeFentonMikeFenton
756
add a comment |
I have a ~5GB python SQLITE3 database (accessed using SQLalchemy) that is installed on a number of machines with varying architectures. Queries to this database can take dramatically longer (up to 100x) if the SQLite cache is cold.
If I know the cache is cold, I can change the query to make it faster by essentially reading the entire table in chunks and filtering the data I want out of every chunk. However, this changed query will still be slower than the normal query on a hot cache, so I can't use it all the time.
Is there any way to check if the cache is hot or cold using SQLalchemy / SQLITE3?
python sql sqlite sqlite3 sqlalchemy
asked Nov 22 '18 at 11:12
MikeFentonMikeFenton
756
I have a ~5GB python SQLITE3 database (accessed using SQLalchemy) that is installed on a number of machines with varying architectures. Queries to this database can take dramatically longer (up to 100x) if the SQLite cache is cold.
If I know the cache is cold, I can change the query to make it faster by essentially reading the entire table in chunks and filtering the data I want out of every chunk. However, this changed query will still be slower than the normal query on a hot cache, so I can't use it all the time.
Is there any way to check if the cache is hot or cold using SQLalchemy / SQLITE3?
python sql sqlite sqlite3 sqlalchemy
python sql sqlite sqlite3 sqlalchemy
asked Nov 22 '18 at 11:12
MikeFentonMikeFenton
756
asked Nov 22 '18 at 11:12
MikeFentonMikeFenton
756
asked Nov 22 '18 at 11:12
MikeFentonMikeFenton
756
asked Nov 22 '18 at 11:12
MikeFentonMikeFenton
756
asked Nov 22 '18 at 11:12
MikeFentonMikeFenton
756
756
add a comment |
add a comment |
0
active
oldest
votes
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
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: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
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
});
}
});
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
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53429701%2fis-it-possible-to-check-if-the-sqlite-cache-is-hot-or-cold%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
0
active
oldest
votes
0
active
oldest
votes
active
oldest
votes
active
oldest
votes
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
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
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53429701%2fis-it-possible-to-check-if-the-sqlite-cache-is-hot-or-cold%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
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
Required, but never shown
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
Required, but never shown
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
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
