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Keeping Track of Data Load Sources
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This tip was authored by Jim Knicely.
If you are like most companies, you will be loading data into a Vertica table from many different data files. And if you are like me, you’ll forget later which file a table record arrived in. Fortunately the CURRENT_LOAD_SOURCE function returns the file name used when executing a COPY statement and I can use it to keep a record of the data file used.
Example:
dbadmin=> CREATE TABLE daily_load (id INT, some_data1 VARCHAR(100), some_data2 VARCHAR(100), file_loaded VARCHAR(200)); CREATE TABLE dbadmin=> COPY daily_load (id, some_data1, some_data2, file_loaded AS CURRENT_LOAD_SOURCE()) FROM '/home/dbadmin/test*_load.txt'; Rows Loaded ------------- 6 (1 row) dbadmin=> SELECT * FROM daily_load; id | some_data1 | some_data2 | file_loaded ----+------------+------------+------------------------------ 1 | TEST1 | TEST2 | /home/dbadmin/test1_load.txt 2 | TEST10 | TEST20 | /home/dbadmin/test1_load.txt 3 | TEST100 | TEST200 | /home/dbadmin/test1_load.txt 4 | TEST3 | TEST4 | /home/dbadmin/test2_load.txt 5 | TEST30 | TEST40 | /home/dbadmin/test2_load.txt 6 | TEST300 | TEST400 | /home/dbadmin/test2_load.txt (6 rows)
Have Fun!
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