Questions tagged [information-schema]

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MYSQL 8.0.2.8 Information_schema character set is incorrect, and I cannot find where to change it

I have a database installation where the collations look as so: As you can see, all the databases are utf8mb4, while the information schema is showing up as utf8mb3. This is causing me issues as I ...
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MySQL information.schema.tables shows create_time later than update_time?

I've checked the documentation, but couldn't find anything that could explain this. mysql> SELECT * FROM information_schema.`TABLES` WHERE table_schema='myschema' AND TABLE_NAME ='mytable' \G; *****...
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How is the information_schema table in trino updated?

We use Trino (https://trino.io/) to connect to HDFS. I discovered that the data in the information_schema tables, for example: select * from information_schema.columns clz where clz....
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Can i join output of "Describe" queries with other tables in snowflake

I trying to use the Describe table in more complex way, thing like join with other tables , or other sql manipulation. On the other hand it's look that snowflake not accept the Describe table as ...
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What is faster: pg_catalog or information_schema?

I understand the high-level differences between pg_catalog and information_schema. But in many cases, a tool could choose to use any of them. And I'm wondering if there are performance reasons why we ...
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Is there a way to examine all column definitions in MS-SQL?

I'm making a first program in MS-SQL. The idea is to make a proposal for a next tupple. One of the features is based on auto-increment (in case auto-increment is set, take the highest filled-in value, ...
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table listed in information_schema.tables does not exist [closed]

I have the following query SELECT table_name FROM information_schema.tables WHERE table_type = 'BASE TABLE' order by table_name and it lists a table AppFeature which I am not familiar with. The ...
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What can go wrong while querying INFORMATION_SCHEMA for schema names? [duplicate]

In this doc page on the use of the SQL standard INFORMATION_SCHEMA views, on the columns about schema names, the following warning is repeated each time: ** Important ** Do not use INFORMATION_SCHEMA ...
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Information schema standard - where can I find more information?

Wikipedia says that information schema is an ANSI-standard and I found many implementations of it but I can't find a paper by ANSI that describes it. Can you help me to find out more about it?
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Identify column name information from table schema [duplicate]

I have multiple tables with with varying names for the same piece of data. For example, day vs business_day. I'd like to identify what column names exist for which table. I think this can be done ...
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How to use a query to get the definition of (MariaDB 10.3.27) database objects (specifically the variables they use)

I have written a query to get most of the useful information about the routines in a MariaDB database for a database documenter that I am developing. The code below will return routine name, routine ...
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SQL: How to get all tables' columns & keys + the primary key?

Database Info MySQL 8.0.22 InnoDB The Goal I'm trying to get all tables in a database, with their column definitions and foreign keys, and primary keys on their own row for each table group. Given the ...
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What is the differrence between mysql.innodb_table_stats and information_schema.innodb_tablestats?

I am using mysql-8.0.19. I want to find a way to detect changes in database tables. E.g. compare the value of a query to the value of the last query. I see that there exist two tables from which I ...
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Does MySQL have a built-in way to tell whether a view is insertable (not just updatable)? E.g., something like the IS_UPDATABLE flag, but for INSERT?

The MySQL documentation for the INFORMATION_SCHEMA.VIEWS table mentions that MySQL sets a flag whenever a view is created that records whether that view is updatable, i.e., whether you can UPDATE the ...
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Unexpected result from PostgreSQL information schema

I have written a simple query that should show all table sizes of any given schema in human-readable format: select table_name, pg_relation_size(quote_ident(table_name)) from information_schema.tables ...
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Is it possible to create Dynamic SQL statements purely in SQLite? [closed]

A lot of modern RDBMS have a feature called Dynamic SQL (MS SQL Server, for example) which allows you to build your SQL statements in strings and then execute that string of SQL. Does such a feature ...
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How to inspect a view's structure in information schema in PostgreSQL?

Is there a way to discover the structure of a view in a similar way to how tables are described by entries in information_schema.columns? I can also use the pg_* tables. In other words, similar to how ...
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Memory Used On global_status mariadb

on mariadb at information_schema.global_status they have variable name memory_used in bytes this is actual memory use from mariadb ? edit add example case on my servers i have threads_running=10 and ...
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Non-existent table that actually exists?

I've been tasked to solve a very difficult and interesting problem. Given is a MySQL database created on the AWS-Aurora service. The MySQL version reported when connecting is 5.6.10. We have an ...
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Delete INFORMATION_SCHEMA

I recently created a new database and INFORMATION_SCHEMA was there. I am aware that users should not mess with backend services, but INFORMATION_SCHEMA has 0 bytes. I checked all the tables and there ...
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In SQL Server, for numeric data type, can the CHARACTER_MAXIMUM_LENGTH be different from NULL?

I have a SQL Server with numeric types for few columns. When getting a table structure, I have the following results: Query: SELECT * FROM DB.INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = '...
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Select query on information_schema is too slow

SELECT * FROM information_schema.TABLE_CONSTRAINTS WHERE CONSTRAINT_SCHEMA = DATABASE() AND CONSTRAINT_NAME = 'FK_FOLDER_FILTER_CONTRACT_CATEGORY_CONTRACT_CATEGORY' AND CONSTRAINT_TYPE = '...
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MYSQL - Run a query based on the results of a query

Trying to do some cleanup in the database, per manager request. However, I can't seem to get Mysql to run the inner query as written. select @tbl:=column_name as'Table', ( select max(length(@...
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List foreign keys dependencies that refer to a given table

RDBMS: PostgreSQL 9.6 I desire to list the foreign keys for a given table and schema. I am about 90 % there but I also desire to know what options were used to make the fkey. Example on delete ...
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Are there any downfalls to not using foreign key relationships in a multi-tenary scheme?

We have a proposed restructure of our CRM containing almost 500 databases containing ~25 tables each into a single multidimensional database with one giant fact table linking everything together. I ...
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Postgres view column references

Using the Postgres information_schema or system catalogs, is it possible to determine what table columns are referenced by the columns in a view? information_schema.view_column_usage provides ...
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Does CUBRID have Information Schema Views?

I am trying to access the Information Schema views as defined in SQL92, and cannot find any in the CUBRID RDBMS. Has CUBRID implemented this specification and how can I access them? CUBRID version: ...
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MySQL: list users which have been granted EXECUTE permission on a given procedure

I would like to audit my database to check which users have been granted individual EXECUTE permission to which procedure. I would like to use this information to be able to save GRANTs when changing ...
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2 votes
2 answers
467 views

Predicting the primary keys exhaustion in MySQL based on rate of insertion

We are running out of primary keys for our table in production. We do not want that to occur again. So we need a mechanism to alert us when we are running out of primary keys based on the rate of ...
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Why do information_schema queries scan all databases?

I'm building a PHP application that looks up the last modified date of all databases using information_schema. A simplified version is like this: $sql = "SELECT update_time FROM information_schema....
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How to select maximum date_created value from all tables matching certain pattern?

Given a MySQL DB with a hundreds of tables with the ones of interest being named ap_form_* where * = a random value. How do I loop through that list of tables to display the MAX(date_created) for each ...
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921 views

Why is the value of NUMERIC_SCALE column in INFORMATION_SCHEMA.COLUMNS table for DATA_TYPE='double' NULL?

I have created a column whose data_type is DOUBLE. alter table my_table add column my_column double; When I queried about this column in information_schema.COLUMNS table I found that the ...
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3 votes
2 answers
11k views

GRANT SELECT ON SEQUENCE succeeds, but to no effect?

I am trying to grant select access to sequences from one user/role to another. There are no errors when I run the command but once run, the second role is unable to view the sequences. I have run the ...
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Information_Schema on oracle?

I'm a SQL Server DBA, and I like to mess around with Oracle here and there. I can see with select * from information_Schema.columns everything about a table (everything that I need now). Is there a ...
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Does MariaDB 5.5.56 have INFORMATION_SCHEMA.INNODB_METRICS?

I'm trying to debug why I don't have INFORMATION_SCHEMA.INNODB_METRICS. I'm uncertain because I see it in the MySQL 5.5 reference glossary: https://dev.mysql.com/doc/search/?d=10&p=1&q=...
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Is it possible to concatenate query results to form a new query?

I have now: SELECT TABLE_SCHEMA , TABLE_NAME , COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE COLUMN_NAME = 'NNN'; This gives me several hundreds of rows, because several tables contain ...
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Information_Schema.Tables reports different result in MySQL 5.5 and MySQL 5.7

I have started testing some MySQL 5.7 databases to replace our ageing 5.5 Databases, and there seems to be a significant change in the way the information_schema.tables Table records the data size. I ...
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MySQL copy all views from one database to another in stored procedure

I've got a stored procedure that copies all tables from one database to another but steps through each table individually (because of queries). I need to add to the stored procedure to copy all views ...
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Query to identify bad indexes and/or no indexes (on tables with lots of records) takes 4-6 minutes to execute

Query: SELECT Concat(t.table_schema, '.', t.table_name), t.table_rows, snu.non_unique, smax.cardinality, ( t.table_rows / Ifnull(smax.cardinality, 1) ) AS ...
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10 votes
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Why shouldn't INFORMATION_SCHEMA views be used to determine the schema of an object?

According to MS-DOCS about System information schema views, the schema columns definition have a warning note that says: ** Important ** Do not use INFORMATION_SCHEMA views to determine the schema ...
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Where in pg_catalog is the database or catalog information stored about relations?

When I query a table like information_schema.tables SELECT table_catalog, table_schema, table_name FROM information_schema.tables; I get a result like this, table_catalog | table_schema ...
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How do I list all columns for a specified table that begin with a specific string [duplicate]

How to select all the columns whose names begins with "img" from a PostgreSQL table? I wrote that, but doesn't work select 'img%' from mytable
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Why does information_schema have "YES" and "NO" character strings rather than booleans?

I was taken by surprise to find that the is_nullable column for this query is typed as character varying (3) rather than boolean: select column_name, data_type, is_nullable from ...
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SQL Server 2016 Temporal tables metadata

Is there any way to get metadata (information scheme) information about temporal table feature for the table, like: Is DATA_CONSISTENCY_CHECK TURNED ON OR OFF What name of history table Is ...
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`SELECT` on `information_schema`.`tables` returns less rows if I `SELECT` the `CREATE_TIME`

Context We have a MySQL 5.6.28 server with a lot of schemas on it. After a crash, we have some schema where a table x exists, and other schemas where it's an orphan table. On a non-corrupted schema, ...
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1 answer
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Information_schema appearing in slow_log

I am finding that my information_schema keeps running this query SELECT engine, COUNT(*) as n FROM information_schema.tables WHERE engine is not null GROUP BY engine Which seems to always appear in ...
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5 votes
1 answer
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postgres system catalog query columns from table

I am building an integration test against an app that provisions a database for a user. The User created for it is not a super user, and does not have access to schema_information.tables because when ...
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2 votes
1 answer
7k views

How do I query INFORMATION_SCHEMA.COLUMNS on Amazon RDS?

I received a list of column names from another team. To ensure all field column names are valid inside a specific schema, I put them into a temporary table. I'm now wanting to see if they exist. When ...
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mariaDB tables create_options clear

I have MariaDB 10.2.9 on Centos7 with ~60 tables. I listed the table's create_options from information_schema.tables: SELECT TABLE_NAME, TABLE_TYPE, CREATE_OPTIONS FROM information_schema.tables ...
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MySQL - "CREATE_OPTIONS" in "information_schema.tables"?

I have a MySQL 5.7.16 Enterprise running on a Centos 6 machine with InnoDB as the default storage engine. I have around 300 tables in which around 90 are "list" partitioned. I have the option ...
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