chore: rerun prettier after merge

This commit is contained in:
Qiao Han
2023-03-01 12:47:53 +08:00
parent 52d0c3a1ee
commit 2104c4e40f
4 changed files with 37 additions and 35 deletions

View File

@@ -62,6 +62,4 @@ jobs:
- name: Run prettier
run: |-
# Check mdx files which contain sql code blocks
grep -lr '```sql' apps/docs/pages/**/*.mdx | \
grep -Ev '(/guides/auth/|/guides/integrations/)' | \
xargs npx prettier -c
grep -lr '```sql' apps/docs/pages/**/*.mdx | xargs npx prettier -c

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@@ -8,3 +8,6 @@ apps/**/out
**/supabase/migrations/*.sql
apps/www/schema.sql
examples/slack-clone/nextjs-slack-clone/full-schema.sql
# ignore files with custom js formatting
apps/docs/pages/guides/auth/*.mdx
apps/docs/pages/guides/integrations/*.mdx

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@@ -19,9 +19,8 @@ This SQL query will show the current size of your Postgres database:
```sql
select
sum(pg_database_size (pg_database.datname)) / (1024 * 1024) as db_size_mb
from
pg_database;
sum(pg_database_size(pg_database.datname)) / (1024 * 1024) as db_size_mb
from pg_database;
```
This value is reported in the [database settings page](https://app.supabase.com/project/_/settings/database).

View File

@@ -14,13 +14,13 @@ Unoptimized queries are a major cause of poor database performance. The techniqu
Database performance is a large topic and many factors can contribute. Some of the most common causes of poor performance include:
* An inefficiently designed schema
* Inefficiently designed queries
* A lack of indexes causing slower than required queries over large tables
* Unused indexes causing slow `INSERT`, `UPDATE` and `DELETE` operations
* Not enough compute resources, such as memory, causing your database to go to disk for results too often
* Lock contention from multiple queries operating on highly utilized tables
* Large amount of bloat on your tables causing poor query planning
- An inefficiently designed schema
- Inefficiently designed queries
- A lack of indexes causing slower than required queries over large tables
- Unused indexes causing slow `INSERT`, `UPDATE` and `DELETE` operations
- Not enough compute resources, such as memory, causing your database to go to disk for results too often
- Lock contention from multiple queries operating on highly utilized tables
- Large amount of bloat on your tables causing poor query planning
Thankfully there are solutions to all these issues, which we will cover in the following sections.
@@ -48,13 +48,11 @@ select
-- max_time,
-- mean_time,
statements.rows / statements.calls as avg_rows
from pg_stat_statements as statements
from
pg_stat_statements as statements
inner join pg_authid as auth on statements.userid = auth.oid
order by
statements.calls desc
limit
100;
order by statements.calls desc
limit 100;
```
This query shows:
@@ -63,7 +61,7 @@ This query shows:
- the role that ran the query
- the number of times it has been called
- the average number of rows returned
- the cumulative total time the query has spent running
- the cumulative total time the query has spent running
- the min, max and mean query times.
This provides useful information about the queries you run most frequently. Queries that have high `max_time` or `mean_time` times and are being called often can be good candidates for optimization.
@@ -86,12 +84,11 @@ select
-- max_time,
-- mean_time,
statements.rows / statements.calls as avg_rows
from pg_stat_statements as statements
inner join pg_authid as auth on statements.userid = auth.oid
order by
max_time desc
limit
100;
from
pg_stat_statements as statements
inner join pg_authid as auth on statements.userid = auth.oid
order by max_time desc
limit 100;
```
This query will show you statistics about queries ordered by the maximum execution time. It is similar to the query above ordered by calls, but this one highlights outliers that may have high executions times. Queries which have high or mean execution times are good candidates for optimisation.
@@ -104,13 +101,19 @@ select
statements.query,
statements.calls,
statements.total_exec_time + statements.total_plan_time as total_time,
to_char(((statements.total_exec_time + statements.total_plan_time)/sum(statements.total_exec_time + statements.total_plan_time) over()) * 100, 'FM90D0') || '%' as prop_total_time
from pg_stat_statements as statements
to_char(
(
(statements.total_exec_time + statements.total_plan_time) / sum(
statements.total_exec_time + statements.total_plan_time
) over ()
) * 100,
'FM90D0'
) || '%' as prop_total_time
from
pg_stat_statements as statements
inner join pg_authid as auth on statements.userid = auth.oid
order by
total_time desc
limit
100;
order by total_time desc
limit 100;
```
This query will show you statistics about queries ordered by the cumulative total execution time. It shows the total time the query has spent running as well as the proportion of total execution time the query has taken up.
@@ -128,12 +131,12 @@ You can view your cache and index hit rate by executing the following query:
```sql
select
'index hit rate' as name,
(sum(idx_blks_hit)) / nullif(sum(idx_blks_hit + idx_blks_read),0) * 100 as ratio
(sum(idx_blks_hit)) / nullif(sum(idx_blks_hit + idx_blks_read), 0) * 100 as ratio
from pg_statio_user_indexes
union all
select
'table hit rate' as name,
sum(heap_blks_hit) / nullif(sum(heap_blks_hit) + sum(heap_blks_read),0) * 100 as ratio
sum(heap_blks_hit) / nullif(sum(heap_blks_hit) + sum(heap_blks_read), 0) * 100 as ratio
from pg_statio_user_tables;
```
@@ -141,7 +144,6 @@ This shows the ratio of data blocks fetched from the Postgres [shared_buffers](h
If either of your index or table hit rate are < 99% then this can indicate your compute plan is too small for your current workload and you would benefit from more memory. [Upgrading your compute](https://supabase.com/docs/guides/platform/compute-add-ons) is easy and can be done from your [project dashboard](https://app.supabase.com/project/_/settings/billing/subscription).
### Optimizing poor performing queries
Postgres has built in tooling to help you optimize poorly performing queries. You can use the [query plan analyzer](https://www.postgresql.org/docs/current/sql-explain.html) on any expensive queries that you have identified: