I am always amazed by the expert mode of the SQLite CLI.
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@bohwaz Plenty have an "explain" feature which gives you the same information albeit less directly.
@TimWardCam
Nope explain doesn't tell you which index you should create. It just tells you what the query planner does. -
@TimWardCam
Nope explain doesn't tell you which index you should create. It just tells you what the query planner does.@bohwaz It's often enough blindingly obvious what you should do about it - I did say "less directly".
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I am always amazed by the expert mode of the SQLite CLI.
You type .expert
Then you paste your SQL query.
And #sqlite tells you which indexes you should create to speed up your query.No AI, no complex program to install. No expensive database architect to pay for. It's just clever programming.
To my knowledge this is the only database in the world to have this feature.
https://sqlite.org/cli.html#index_recommendations_sqlite_expert_
https://sqlite.org/src/dir?ci=trunk&name=ext/expert@bohwaz Oh, I didn't know that. I did know about postgres's EXPLAIN, but that's somewhat less helpful.
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I am always amazed by the expert mode of the SQLite CLI.
You type .expert
Then you paste your SQL query.
And #sqlite tells you which indexes you should create to speed up your query.No AI, no complex program to install. No expensive database architect to pay for. It's just clever programming.
To my knowledge this is the only database in the world to have this feature.
https://sqlite.org/cli.html#index_recommendations_sqlite_expert_
https://sqlite.org/src/dir?ci=trunk&name=ext/expert@bohwaz I'm slightly confident that SQL Server has something like this too, but you get those recommendations by querying the proprietary version of INFORMATION_SCHEMA (or use the GUI in the Azure Portal). It's also based on how often some columns are used in queries, so it also uses some internal telemetry
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@bohwaz I'm slightly confident that SQL Server has something like this too, but you get those recommendations by querying the proprietary version of INFORMATION_SCHEMA (or use the GUI in the Azure Portal). It's also based on how often some columns are used in queries, so it also uses some internal telemetry
@delsehi
Interesting. I never used SQL server though. But I don't think this exists in MySQL, postgre or Oracle. -
I am always amazed by the expert mode of the SQLite CLI.
You type .expert
Then you paste your SQL query.
And #sqlite tells you which indexes you should create to speed up your query.No AI, no complex program to install. No expensive database architect to pay for. It's just clever programming.
To my knowledge this is the only database in the world to have this feature.
https://sqlite.org/cli.html#index_recommendations_sqlite_expert_
https://sqlite.org/src/dir?ci=trunk&name=ext/expert@bohwaz tbh I’ve not used this, but MySQL does have the System Variable `log_queries_not_using_indexes`, which I assume would push you towards using an INDEX on all queries (but the docs suggest to me it’s more about queries that return all rows):
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@bohwaz tbh I’ve not used this, but MySQL does have the System Variable `log_queries_not_using_indexes`, which I assume would push you towards using an INDEX on all queries (but the docs suggest to me it’s more about queries that return all rows):
@craigfrancis
Yup but it will not tell you which indexes should be created, you'll have to think about the query and try things yourself. Fine for a simple query, but when it's a 100 lines long... Slightly harder
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@craigfrancis
Yup but it will not tell you which indexes should be created, you'll have to think about the query and try things yourself. Fine for a simple query, but when it's a 100 lines long... Slightly harder@bohwaz true, and I think SQLite has some really cool features like that… personally I’m trying get MySQL and MariaDB to implement a very simple `WHERE id IN (?)` with a single placeholder for multiple values, as I still keep seeing people `implode(‘, ‘, $ids)` directly into the SQL string for some of that SQL Injection fun
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@bohwaz true, and I think SQLite has some really cool features like that… personally I’m trying get MySQL and MariaDB to implement a very simple `WHERE id IN (?)` with a single placeholder for multiple values, as I still keep seeing people `implode(‘, ‘, $ids)` directly into the SQL string for some of that SQL Injection fun
@craigfrancis
I'm personally using a custom ?? placeholder for this case. And I use implode, but before the call I'm quoting each value -
@craigfrancis
I'm personally using a custom ?? placeholder for this case. And I use implode, but before the call I'm quoting each value@bohwaz yep, that’s probably fine, but I’m not worried about you, I’m worried about the vast majority of developers, and those who aren’t exactly writing the code themselves
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I am always amazed by the expert mode of the SQLite CLI.
You type .expert
Then you paste your SQL query.
And #sqlite tells you which indexes you should create to speed up your query.No AI, no complex program to install. No expensive database architect to pay for. It's just clever programming.
To my knowledge this is the only database in the world to have this feature.
https://sqlite.org/cli.html#index_recommendations_sqlite_expert_
https://sqlite.org/src/dir?ci=trunk&name=ext/expert@bohwaz now I'm going to have to check ClickHouse and DuckDb.
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@TimWardCam
Nope explain doesn't tell you which index you should create. It just tells you what the query planner does.@bohwaz @TimWardCam in SQL Server query plan gives you the CREATE INDEX SQL, if it thinks it's badly needed
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