Like autocommit mode and adding the new column, renaming old & new columns, and dropping the old etc. Are you in autocommit mode or are you managing your transaction block when executing? (Run "END " as one block)ĭepending on what issue you are encountering there are ways to work around them.Are there constraints on the column product_price or is it a key?.Does product_price have a default value?.Does the existing data fit in 18,4? You lost 2 digits before the decimal point - you may need 20,4.What is the encoding of the column product_price?. This leads to the following questions / possibilities: END).įor more information about transactions, see Serializable isolation. create table t 1 (c 0 int encode lzo, c 1 bigint encode zstd, c 2 varchar ( 16) encode lzo, c 3 varchar ( 32) encode zstd) The following statement alters the compression encoding for column c0 from LZO encoding to AZ64 encoding. Advisor provides an ALTER TABLE statement that adds a new column with the suggested data type. The table definition for these examples is as follows. Split your load data files so that the files are about equal size, between 1 MB and 1 GB after compression. You can't alter columns within a transaction block (BEGIN. Amazon Redshift doesnt take file size into account when dividing the workload. You can't alter columns with UNIQUE, PRIMARY KEY, or FOREIGN KEY. You can't alter columns with default values. INSERT INTO temptablename (SELECT column1, column2, column3. ) and insert data from the source table in the required order. CREATE TABLE temptablename (column1 dtype1, column2 dtype2, column3 dtype 3. You can't decrease the size less than maximum size of existing data. You can simply create a new table in Redshift with the required ordering. You can't alter a column with compression encodings BYTEDICT, Size of a column defined as a VARCHAR data type. CREATE TABLE IF NOT EXISTS 2 ( x VARCHAR (255) PRIMARY KEY, y VARCHAR (255), z VARCHAR (255) ) INSERT INTO 2 SELECT FROM 1 Share. I'll use the Redshift documentation on this to show many:ĪLTER COLUMN column_name TYPE new_data_type A clause that changes the Option 2: Create a similar table with PK in one of the columns and copy table contents from original table.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |