How can I check table size in Teradata?
Check table size across all AMPs in Teradata
- SELECT DATABASENAME, TABLENAME, CAST(SUM(CURRENTPERM) /1024/1024/1024 as DECIMAL (6,0)) as MaxPerm_GB.
- FROM DBC.TABLESIZE.
- WHERE DATABASENAME = ” AND TABLENAME = ‘
‘
What is maximum length of table name in Teradata?
You can use these conventions to name such Teradata objects as include tables, views, columns, indexes, and macros. A name must be from 1 to 32 characters long.
How does Teradata calculate row size?
calculated size of the column….Determine the byte alignment overhead for the row.
- Set the value of 64-bit_byte_alignment_bit_overhead to 0 and consult the number of additional presence bits determined in Step 13 of this procedure.
- Determine the maximum alignment among all the fixed length columns in the row.
How many types of tables are there in Teradata?
Teradata Table Types
| S. No. | Table Types |
|---|---|
| 1 | ANSI Temporal |
| 2 | Derived |
| 3 | Error Logging |
| 4 | Global Temporary |
How can you tell who created a table in Teradata?
Find all the tables created by specific User
- select * from dbc. tablesv.
- CreatorName=’Revisit_User1′
- and databasename = ‘Banking_DB’
- and Tablekind = ‘T’;
What is the maximum character size for table or column name?
You’re absolutely right: Table names are 30 characters maximum same as column names.
How many rows can Teradata handle?
There is no limit on number of rows in table provided space is available.
How do you calculate row length?
To estimate the page size, row size, number of rows, and number of data pages:
- Use onstat -b to obtain the size of a page.
- Subtract 28 from this amount to account for the header that appears on each data page.
- To calculate the size of a row, add the widths of all the columns in the table definition.
What are DBC tables in Teradata?
Teradata data dictionary tables are metadata tables present in the DBC database. It can be used for variety of things such as checking table size, query bottleneck and database size etc. Dbc. Columns : Column informatiom of tables, views, join index & hash index etc.
What is DBC table in Teradata?
Teradata data dictionary tables are metadata tables present in the DBC database. It can be used for variety of things such as checking table size, query bottleneck and database size etc.
What is limit in Teradata?
Sometimes it is useful to limit the number of rows that are returned from a query. This can be especially useful when querying very large domains. The Teradata database provides the ability to limit the number of rows returned from a query starting at the beginning of the results using the top keyword.
How many columns are allowed in Teradata?
Maximum number of columns per error table. This limit includes 2,048 data table columns plus 13 error table columns.
What is row length?
Row length is the sum of the chair sizes plus the aisle end allowance(s) which is typically 1″ – 3″ depending on the chair model. Accessories like writing tablets and cupholder armrests may increase this dimension.
How to check for table size in Teradata?
– One row represents one table in a database – Scope of rows: all tables in a database – Ordered by table used size from largest to smallest
How do you create a table in Teradata?
Create a full copy of an existing table.
How to split a large table in Teradata?
Teradata: Split String into multiple columns and Vice Versa. There are table functions available which Split strings into multiple columns or concat multiple columns into single string/column using delimiter character/s. CSVLD: This functions takes in a delimited string (any delimiter can be passed), parses the string and returns multiple
What is the difference between Teradata and big data?
SET TABLE. The tables defined as SET primarily do not allow you store duplicate data.