Desc / Describe Table Partition
Describe Table Partition
Describes the structure of a specific partition of a table.
desc <table_name> partition (<partition_spec>); desc <table_name> partition (<partition_spec>); #!/bin/bash
# Describe Table Partition
desc {{table_name}} partition ({{partition_spec}}); import subprocess
# Describe Table Partition
# Make sure to replace <placeholders> with actual values
def run_command():
cmd = [
"desc",
"<table_name>",
"partition",
"(<partition_spec>);"
]
try:
print(f"Executing: {' '.join(cmd)}")
subprocess.run(cmd, check=True)
except subprocess.CalledProcessError as e:
print(f"Error: {e}")
except FileNotFoundError:
print("Error: desc not found. Please install it first.")
if __name__ == "__main__":
run_command() When To Use
When auditing or troubleshooting partitioned data to ensure correct distribution and integrity.
Pro Tip
Use this command to identify irregularities in partition data types versus overall table types.
Command Builder
Tune the command before you copy it
desc <table_name> partition (<partition_spec>); Anatomy of Output
Understanding the result
+--------------+-----------+------+-----+---------+-------+ Row Separator Begin detailing columns of the specific partition.
| Field | Type | Null | Key | Default | Extra | Column Definitions Details about each column in the specified partition.
+--------------+-----------+------+-----+---------+-------+ Separator Denotes the end of column definitions.
| id | int(11) | NO | PRI | NULL | | Column Entry Indicates characteristics of the partition's columns.
| partition_key | varchar(50) | YES | | NULL | | Column Entry Column that is key for partitioning.
+--------------+-----------+------+-----+---------+-------+ Row Separator Completion of output.
Troubleshooting
Common pitfalls
ERROR 1146 (42S02): Table 'xyz.table_name' doesn't exist
Solution: Ensure the correct database is being accessed.
ERROR 1492 (HY000): Invalid partition specification
Solution: Verify the syntax of the specified partition.
ERROR 1050 (42S01): Table already exists with the specified name
Solution: Avoid naming conflicts or confirm table status.
Command Breakdown
What each part is doing
-
desc - Base Command
- The executable that performs this operation. Here it runs Desc before the shell applies any redirect operators.
-
<table_name> - table name
- The value supplied for table name.
-
<partition_spec> - partition spec
- The value supplied for partition spec.
Alternative Approaches
Comparable commands in other tools
Alternative data processing tools for the same job.
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