how do i determine the size of a table in teradata

by Vida O'Keefe Published 2 years ago Updated 2 years ago

Table size in Teradata Query to find the Database size: SELECT DATABASENAME, SUM (CURRENTPERM)/1024**2 AS CURRENT_MB, SUM (CURRENTPERM)/1024**3 AS CURRENT_GB FROM DBC.ALLSPACE WHERE DATABASENAME = 'Banking_DB' GROUP BY 1

To find the Table Space Size of your table across all AMPs in Teradata

SELECT DATABASENAME, TABLENAME, SUM(CURRENTPERM)
FROM DBC. TABLESIZE.
WHERE DATABASENAME = '<database>' AND TABLENAME = '<table>'
GROUP BY DATABASENAME , TABLENAME;

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How can I check table size in Teradata?

Check table size across all AMPs in TeradataSELECT DATABASENAME, TABLENAME, CAST(SUM(CURRENTPERM) /1024/1024/1024 as DECIMAL (6,0)) as MaxPerm_GB.FROM DBC.TABLESIZE.WHERE DATABASENAME = '' AND TABLENAME = '

'GROUP BY DATABASENAME , TABLENAME;More items...

How do I find the table size in GB?

select segment_name,segment_type, sum(bytes/1024/1024/1024) GB from dba_segments where segment_name='&Your_Table_Name' group by segment_name,segment_type; Storage.

What is skew factor in Teradata?

Skewness is the statistical term, which refers to the row distribution on AMPs. If the data is highly skewed, it means some AMPs are having more rows and some very less i.e. data is not properly/evenly distributed. This affects the performance/Teradata's parallelism.

How many types of tables are there in Teradata?

Teradata Table TypesS. No.Table Types1ANSI Temporal2Derived3Error Logging4Global Temporary5 more rows

How do you determine the size of a table?

List Table Sizes From a Single DatabaseSELECT TABLE_NAME AS `Table`, ROUND((DATA_LENGTH + INDEX_LENGTH) / 1024 / 1024) AS `Size (MB)` FROM information_schema. ... SELECT TABLE_NAME AS `Table`, ROUND((DATA_LENGTH + INDEX_LENGTH) / 1024 / 1024) AS `Size (MB)` FROM information_schema.More items...

How do I find the length of a table in SQL?

The SQL COUNT() function returns the number of rows in a table satisfying the criteria specified in the WHERE clause. It sets the number of rows or non NULL column values. COUNT() returns 0 if there were no matching rows.

How do I fix skewed data in Teradata?

15.10 - Finding and Fixing Skewed Tables - Teradata DatabaseChapter 1 Setting Up Your Administrative Environment: All DBAs.Logging in to the Operating System.About Root Logons.About Tdtrusted Logons.About User DBC.Setting Up Teradata Administrator.Set Up the Data Directory for Teradata Administrator.More items...

How can we reduce skewness of a table in Teradata?

To prevent skewing of a table or JI having a primary AMP index (a PA table or join index) during a reconfiguration to fewer AMPs: If the data in a PA table does not need to be retained, delete the rows from the table prior to reconfiguration.

How do you reduce skewness?

Log transformation is most likely the first thing you should do to remove skewness from the predictor. It can be easily done via Numpy, just by calling the log() function on the desired column. You can then just as easily check for skew: And just like that, we've gone from the skew coefficient of 5.2 to 0.4.

How do I list all tables in Teradata?

Teradata SQL Assistant for Microsoft Windows User Guide Select Tools > List Tables. Note: Wildcard characters only function when using an ODBC connection. Note: This field does not apply to Microsoft Access databases.

What is schema in Teradata?

Teradata PT requires that the job script describe the structure of the data to be processed, that is the columns in table rows or fields in file records. This description is called the schema.

What is FastLoad in Teradata?

Teradata FastLoad is used to load a large amount of data in an empty table on a Teradata System or load data from the client to the Database system. It allows fast loading of a single empty table with no SIs, JIs, HIs, or RI (FKs) or column partitioning.

How do I find the size of a table in mysql?

To check the sizes of all of the tables in a specific database, at the mysql> prompt, type the following command. Replace database_name with the name of the database that you want to check: Copy SELECT table_name AS "Table", ROUND(((data_length + index_length) / 1024 / 1024), 2) AS "Size (MB)" FROM information_schema.

How do I find the size of a Postgres table?

To determine the size of a Postgres database table from the command line, log in to your server using SSH and access the database with the table you want to check. Type this code in the command line to determine the size of any of the database's tables. SELECT pg_size_pretty( pg_total_relation_size('tablename') );

How do I find large tables in SQL Server?

4 AnswersSELECT.'[' + (OBJECT_SCHEMA_NAME(tables. object_id,db_id())+ '].[' + tables. NAME + ']') AS TableName,(sum(allocation_units. total_pages) * 8) / 1024 as TotalSpaceMB.FROM.sys. tables tables.INNER JOIN.sys. indexes indexes ON tables. OBJECT_ID = indexes. object_id.More items...•

How do I find the size of an Oracle database?

The size of the database is the space the files physically consume on disk. You can find this with: select sum(bytes)/1024/1024 size_in_mb from dba_data_files; But not all this space is necessarily allocated.

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