Questions tagged [information-schema]

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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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32 views

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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Different Permissions Behavior For Information Schema on Views

I have a view which have following definition Create view view1 as select * from information_schema.events where event_schema="database1" I have granted select permissions on the view1 to ...
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39 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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27 views

PRIVILEGES table for ROUTINES in INFORMATION_SCHEMA

In information_schema, there are four privileges table. show tables like '%PRIV%'; +---------------------------------------+ | Tables_in_information_schema (%PRIV%) | +-------------------------------...
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95 views

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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29 views

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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67 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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Why information_schema.columns is_nullable is varchar? [duplicate]

Looking for all columns "not null" is very useful sometimes, right? So, I'm thinking on "why on earth the 'is_nullable' columns from information_schema.columns is varchar, not boolean?" On first ...
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2answers
719 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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312 views

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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394 views

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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112 views

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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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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305 views

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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480 views

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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2answers
267 views

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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284 views

`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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1answer
38 views

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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1answer
5k views

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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1answer
2k 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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139 views

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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759 views

Unable to join on conrelid and confrelid columns in pg_constraint

I'm trying to get a list of foreign key constraints in the following form: pk_table | pk_col | fk_table | fk_col without using pg_get_constraintdef (which would force me to resort to string ...
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49 views

error codes in information_schema

Is there a view or table or relation in information_schema with the error codes or exception names? My question is in STANDARD sql or in PostgreSQL.
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4k views

How to get the next auto-increment id in MySQL?

How to get the next id in mysql to insert it in the table ? INSERT INTO payments (date, item, method, payment_code) VALUES (NOW(), '1 Month', 'paypal', CONCAT("chaminda", id))
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1k views

Tables in one of my schemas are not listed in INFORMATION_SCHEMA.TABLES. What can be the reason?

I have three schemas in my SQL Server database, but when I query over INFORMATION_SCHEMA.TABLES only tables that belong to two of the schemas are listed. Tables in the third schema are not listed. ...
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1answer
43 views

How to locate all the tables that have a field named username

Is there a way in PhpMyAdmin to do a SQL search for all tables, that have a fieldname username in it? I am trying to help a friend that has a database with over 1,000 tables in it. He needs to find ...
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453 views

How do I navigate PostgreSQL documentation to find a list of all functions that work on a specific type?

Let's say I want to find a list of functions that can work on jsonb, what is the most effective way to do this from the terminal without using google? Assuming only access to man pages psql ...
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1answer
570 views

MySQL - huge Dictionary memory allocated

Our MySQL 5.5.38 servers have 1000-3000 InnoDB databases each (with about 100 tables each). All data is in single file. Most of DBs are active. While it's expected that information schema should be ...
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Schema transfer of SP does not update information_schema.routines.routine_definition / object_definition?

After a transfer of an SP from one schema to another, the information_schema.routines.routine_definition and object_definition() still show the original schema. create schema SchemaA; go create proc ...
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2answers
1k views

count null values of table from information_schema tables

Is there any way to count null values in a column by using information_Schema tables? EG: SELECT table_name, table_rows FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA ='myschema' and ...
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121 views

where are the infos from 'SHOW CREATE TABLE' coming from? It's not INFORMATION_SCHEMA

Quote from MariaDB 10.2 CHECK and DEFAULT clauses: Another limitation is that CHECK metadata are not accessible via the INFORMATION_SCHEMA. The only way to find out if a table has CHECK clauses ...
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36 views

Different services using different port pointing to same datadir folder

Let say I have already installed service MySQLa with mysqla.ini (port number=3306) setting and datadir folder in ...\data Is it possible then, I install another service MySQLb with mysqlb.ini (port ...
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1answer
500 views

Is there a way to get SQL Server capcity constraints dynamically

I have some code which creates database tables dynamically, and I want to ensure that people don't try to do things that result in me trying to create a table with more columns than what SQL Server ...
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35 views

What are all the catalogs that RDBMS have to implement to be ANSI compliant?

My goal is to be able to go into any environment, and immediately get a general idea of what is going on in a database server. I know most RDBMS implement INFORMATION_SCHEMA, which has a lot of useful ...
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2answers
2k views

Query to retrieve index details for a particular column in all tables

There is a column created_at in most of tables. I would like to get the details if that field exists in the table and it is not indexed. Is there any thing can be done with the information_schema to ...
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1answer
8k views

how to update information_schema.tables in mysql [duplicate]

i have a table A and i want to update the creation time of this table. I understand i cant simple update ( using update query) as it is not any table. Is there any way i can update it. for example ...
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1answer
100 views

What happens to mysql information_schema after switching to innodb_file_per_table?

We're switching our mysql dev deb instance to innodb_file_per_table and moving the data dir onto another mounted drive so we can free up space on our dev box. We've backed all our dbs up and about to ...
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998 views

What permissions are required to return rows from information_schema.schemata?

In postgres (I'm on 9.3.4) what permissions are required to return rows for select * from information_schema.schemata The 9.3 documentation says "are owned by a currently enabled role". Does that ...
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1answer
388 views

MariaDB: calculate the reads/writes ratio in percent

I found a blog post howto calculate the reads/writes ratio in percent. I receive NULL values in our env. > SELECT @total_com := SUM(IF(variable_name IN ('Com_select', 'Com_delete', 'Com_insert', '...
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1answer
1k views

Amazon Aurora CREATE_TIME in INFORMATION_SCHEMA.TABLES is NULL

We are running an Amazon Aurora database that emulates MySQL 5.6.10. The CREATE_TIME in SHOW TABLE STATUS and INFORMATION_SCHEMA.TABLES is consistently NULL for all our tables. Is this a bug, a ...
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249 views

Get the name of the table column referenced by a (auto updatable) view column (PostgreSQL)

Given the folowing view definition create or replace view projects as select id, client_id as clientId from data.projects Is it possible, knowing the view name and the view column to get the name of ...
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732 views

Does INFORMATION_SCHEMA always contain up-to-date metadata?

This query prints the size (in terms of data and indexes) of the tables in mydatabase: SELECT table_name "Table name", round(((data_length)/1024/1024),2) "Data size", round(((index_length)/1024/1024)...
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194 views

Query other database's INFORMATION_SCHEMA tables

I have a shared database that stores procedures for all the other databases on the same server. This helps maintain one instance of a procedure rather than copying it across all databases. As long as ...
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1answer
9k views

INFORMATION_SCHEMA.GLOBAL_VARIABLES alternative in 5.7? More info about show_compatibility_56

mysql> SELECT * FROM GLOBAL_VARIABLES; ERROR 3167 (HY000): The 'INFORMATION_SCHEMA.GLOBAL_VARIABLES' feature is disabled; see the documentation for 'show_compatibility_56' mysql> SELECT VERSION(...
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1answer
734 views

How do I join information schema to the table's data?

I need to join a table using it's column name from the INFORMATION SCHEMA. Is this possible? I actually found another way to work around it. I am using Innodb. For the structure it's kind of ...
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1answer
2k views

INFORMATION_SCHEMA.VIEW_TABLE_USAGE only shows tables from the same catalog

I'm working with a database that has many cross-database views. While INFORMATION_SCHEMA.VIEWS lists all these views, INFORMATION_SCHEMA.VIEW_TABLE_USAGE and INFORMATION_SCHEMA.VIEW_COLUMN_USAGE do ...