MySQL 1241: Cannot shrink partition.

When encountering the error 1241: Cannot shrink partition in MySQL, and assuming the role of a user without a database administrator, here are the actionable steps to take immediately:

  1. Check Disk Space: Ensure there is enough disk space on the server. You can use the command `df -h` to check the available disk space on your server.



  1. Review MySQL Logs: Look into the MySQL error log for any additional messages related to the partition issue. The error log location varies, but you can find it by running:


SHOW VARIABLES LIKE 'log_error';
Then, review the log file for detailed error messages that might give more context about the issue.

  1. Inspect Partition Information: To understand the current partitioning scheme and to identify if there's a specific partition that's problematic, run:


SELECT PARTITIONNAME, TABLEROWS FROM INFORMATIONSCHEMA.PARTITIONS WHERE TABLESCHEMA = 'yourdbname' AND TABLENAME = 'yourtable_name';
Replace `yourdbname` and `yourtablename` with the actual database and table names.

  1. Check Table Storage Engine: Ensure the table's storage engine supports shrinking. You can check the storage engine by running:


SHOW TABLE STATUS LIKE 'yourtablename';
Look for the `Engine` value in the output.

  1. Analyze Table and Optimize if Necessary: Sometimes, data fragmentation can cause issues with partitions. To analyze the table, run:


ANALYZE TABLE yourtablename;
If the analysis suggests optimization might help, and it's safe to do so (ensure you have a backup), you can run:
OPTIMIZE TABLE yourtablename;
Note: `OPTIMIZE TABLE` can lock the table, so consider the impact on your application before running it.

  1. Manual Partition Management: If you're trying to manually shrink a partition but it's not allowed due to constraints or data distribution, you may need to manually redistribute the data. This involves creating a new table with the desired partition scheme, copying data over, and then renaming tables. This is complex and should be done with caution.



  1. Check for Foreign Key Constraints: If the table is involved in foreign key relationships, it can complicate partition operations. Check for foreign keys by running:


SELECT TABLENAME, COLUMNNAME, CONSTRAINTNAME, REFERENCEDTABLENAME, REFERENCEDCOLUMNNAME FROM INFORMATIONSCHEMA.KEYCOLUMNUSAGE WHERE TABLESCHEMA = 'yourdbname' AND TABLENAME = 'yourtablename';

  1. Consult MySQL Documentation: Given the specific error and context, consulting the MySQL documentation for version-specific limitations or behaviors related to partitioning might provide additional insights.



Remember, any action involving data manipulation (like redistributing data, optimizing tables) should be preceded by a full backup of your database to prevent data loss.

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MySQL 1252: Partition does not exist.
MySQL 1251: Key not allowed in partition.
MySQL 1250: Partition key not allowed.
MySQL 1247: Cannot split partition.
MySQL 1249: Cannot update partition index.
MySQL 1248: Cannot update partition schema.
MySQL 1246: Cannot merge partition.
MySQL 1244: Cannot create partition.
MySQL 1245: Cannot drop partition.
MySQL 1243: Statement failed due to partition.
MySQL 1242: Cannot expand partition.
MySQL 1240: Partition is corrupted.
MySQL 1241: Cannot shrink partition.
MySQL 1239: Partition needs repair.
MySQL 1236: Cannot access partition.
MySQL 1238: Cannot repair partition.
MySQL 1237: Partition is full.
MySQL 1234: Cannot unlock partition.
MySQL 1235: Statement not allowed in partition.
MySQL 1232: Cannot delete partition.
MySQL 1231: Cannot update partition.
MySQL 1233: Cannot lock partition.
MySQL 1230: Duplicate partition key.
MySQL 1229: Cannot drop partition.
MySQL 1228: Cannot add partition.
MySQL 1226: Failed to drop partition.
MySQL 1227: Failed to create partition.
MySQL 1222: Too many partitions.
MySQL 1212: Permission denied for key.
MySQL 1225: Duplicate partition name.
MySQL 1224: Partition not empty.
MySQL 1223: Partition key was not found.
MySQL 1221: Cannot delete parent row.
MySQL 1220: Cannot update parent row.
MySQL 1219: Cannot update child row.
MySQL 1216: Cannot delete or update a parent row.
MySQL 1218: Cannot delete child row.
MySQL 1215: Cannot add foreign key constraint.
MySQL 1217: Cannot add child row.
MySQL 1214: Row was updated.
MySQL 1213: Deadlock found when trying to get lock.
MySQL 1208: Failed to drop key.
MySQL 1211: Too many open files.
MySQL 1210: Key already exists.
MySQL 1209: Key not found.
MySQL 1204: Cannot update entry.
MySQL 1206: Error in unique key constraint.
MySQL 1207: Duplicate key found.
MySQL 1205: Error in foreign key constraint.
MySQL 1203: Cannot insert entry.
MySQL 1202: Cannot delete entry.
MySQL 1199: Statement failed due to index.
MySQL 1200: Index is corrupted.
MySQL 1201: Duplicate key value.
MySQL 1198: Error closing file.
MySQL 1193: Statement failed due to table.
MySQL 1197: Failed to open file.
MySQL 1175: Statement not allowed in schema.
MySQL 1196: Too many connections.
MySQL 1194: Table needs repair.
MySQL 1195: Table is corrupted.
MySQL 1192: Statement failed due to view.
MySQL 1191: Statement failed due to procedure.
MySQL 1189: Statement failed due to event.
MySQL 1190: Statement failed due to function.
MySQL 1186: SAVEPOINT cannot be rolled back.
MySQL 1188: Statement failed due to trigger.
MySQL 1187: Statement failed due to SAVEPOINT.
MySQL 1185: SAVEPOINT does not exist.
MySQL 1184: Cannot use SAVEPOINT in transaction.
MySQL 1183: Command not allowed in transaction.
MySQL 1182: Connection was closed.
MySQL 1181: Duplicate transaction.
MySQL 1180: Read-only transaction violation.
MySQL 1179: Transaction is read-only.
MySQL 1176: Statement not allowed in session.
MySQL 1178: Transaction not active.
MySQL 1177: Session not open.
MySQL 1174: Statement not allowed in row.
MySQL 1173: Statement not allowed in table.
MySQL 1172: Statement not allowed in transaction.
MySQL 1170: Cannot open database.
MySQL 1171: Null column in table.
MySQL 1169: Duplicate key.
MySQL 1168: Failed to create file.
MySQL 1167: Out of disk space.
MySQL 1165: Error reading from file.
MySQL 1166: Error writing to file.

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