Increasing working memory in psql does not improve query performance
I am very new to database administration and could use any advice from more expert users of PostgreSQL
My database is an AWS RDS db.m4.large whose specification are here
My queries against one of the larger tables in the database (330 million rows) are running extremely slow and/or timing out, even when I am have a query such as
SELECT(DISTINCT value) FROM mytable;
where there are only 4 or 5 unique values in the value column. It is not indexed.
pg_size_pretty(pg_total_relation_size(relid)) shows the size of the table to be 118 GB
Even when setting work_mem to 240 MB, which should allows psql to do larger in-memory sorts, the query is equally as slow
EXPLAIN ANALYZE SELECT(DISTINCT value) FROM mytable;
also times out
What does one do to optimize memory usage for querying on a sufficiently large database? Which pg settings would I need to monitor and/or configure differently ?
Any help would be appreciated.
postgresql psql
asked 3 mins ago
the_darksidethe_darkside
12016
add a comment |
I am very new to database administration and could use any advice from more expert users of PostgreSQL
My database is an AWS RDS db.m4.large whose specification are here
My queries against one of the larger tables in the database (330 million rows) are running extremely slow and/or timing out, even when I am have a query such as
SELECT(DISTINCT value) FROM mytable;
where there are only 4 or 5 unique values in the value column. It is not indexed.
pg_size_pretty(pg_total_relation_size(relid)) shows the size of the table to be 118 GB
Even when setting work_mem to 240 MB, which should allows psql to do larger in-memory sorts, the query is equally as slow
EXPLAIN ANALYZE SELECT(DISTINCT value) FROM mytable;
also times out
What does one do to optimize memory usage for querying on a sufficiently large database? Which pg settings would I need to monitor and/or configure differently ?
Any help would be appreciated.
postgresql psql
asked 3 mins ago
the_darksidethe_darkside
12016
add a comment |
I am very new to database administration and could use any advice from more expert users of PostgreSQL
My database is an AWS RDS db.m4.large whose specification are here
My queries against one of the larger tables in the database (330 million rows) are running extremely slow and/or timing out, even when I am have a query such as
SELECT(DISTINCT value) FROM mytable;
where there are only 4 or 5 unique values in the value column. It is not indexed.
pg_size_pretty(pg_total_relation_size(relid)) shows the size of the table to be 118 GB
Even when setting work_mem to 240 MB, which should allows psql to do larger in-memory sorts, the query is equally as slow
EXPLAIN ANALYZE SELECT(DISTINCT value) FROM mytable;
also times out
What does one do to optimize memory usage for querying on a sufficiently large database? Which pg settings would I need to monitor and/or configure differently ?
Any help would be appreciated.
postgresql psql
asked 3 mins ago
the_darksidethe_darkside
12016
I am very new to database administration and could use any advice from more expert users of PostgreSQL
My database is an AWS RDS db.m4.large whose specification are here
My queries against one of the larger tables in the database (330 million rows) are running extremely slow and/or timing out, even when I am have a query such as
SELECT(DISTINCT value) FROM mytable;
where there are only 4 or 5 unique values in the value column. It is not indexed.
pg_size_pretty(pg_total_relation_size(relid)) shows the size of the table to be 118 GB
Even when setting work_mem to 240 MB, which should allows psql to do larger in-memory sorts, the query is equally as slow
EXPLAIN ANALYZE SELECT(DISTINCT value) FROM mytable;
also times out
What does one do to optimize memory usage for querying on a sufficiently large database? Which pg settings would I need to monitor and/or configure differently ?
Any help would be appreciated.
postgresql psql
postgresql psql
asked 3 mins ago
the_darksidethe_darkside
12016
asked 3 mins ago
the_darksidethe_darkside
12016
asked 3 mins ago
the_darksidethe_darkside
12016
asked 3 mins ago
the_darksidethe_darkside
12016
asked 3 mins ago
the_darksidethe_darkside
12016
12016
add a comment |
add a comment |
0
active
oldest
votes
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
});
}
});
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%2fdba.stackexchange.com%2fquestions%2f232343%2fincreasing-working-memory-in-psql-does-not-improve-query-performance%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 Database Administrators Stack Exchange!
- 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%2fdba.stackexchange.com%2fquestions%2f232343%2fincreasing-working-memory-in-psql-does-not-improve-query-performance%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
