MySQL 1242: Cannot expand partition.

When encountering the error 1242: Cannot expand partition in MySQL, the immediate actionable steps are:

  1. Check Disk Space: Ensure there's enough disk space on the server to expand the partition. Use the command:


df -h

  1. Verify MySQL User Permissions: Confirm that the MySQL user has the necessary permissions to alter and manage partitions. Check permissions with:


SHOW GRANTS FOR 'yourmysqluser'@'your_host';

  1. Examine the Partition Scheme: Review the current partitioning scheme to understand the structure and limitations. Use:


SELECT TABLENAME, PARTITIONNAME, TABLEROWS FROM INFORMATIONSCHEMA.PARTITIONS WHERE TABLESCHEMA = 'yourdatabase_name';

  1. Check for Maximum Number of Partitions: MySQL has a limit on the number of partitions. Ensure you haven't reached the limit with:


SELECT COUNT(PARTITIONNAME) FROM INFORMATIONSCHEMA.PARTITIONS WHERE TABLESCHEMA = 'yourdatabasename' AND TABLENAME = 'yourtablename';

  1. Review MySQL Error Log: Look for more detailed error messages or related issues in the MySQL error log. The location can vary, but you can find it by running:


SHOW VARIABLES LIKE 'log_error';
Then, inspect the log file for clues.

  1. Attempt to Reorganize Partitions: If you're trying to add a partition but are close to or at the limit, consider reorganizing existing partitions if possible. Use:


ALTER TABLE yourtablename REORGANIZE PARTITION existingpartitions INTO (partitiondefinitions);
Note: Replace `yourtablename`, `existingpartitions`, and `partitiondefinitions` with your specific details.

These steps are direct actions you can take to investigate and potentially resolve the error 1242 without the need for a database administrator.

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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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