MySQL 1245: Cannot drop partition.

  1. Check if the partition you are trying to drop exists and if it's not in use by running:



SELECT PARTITIONNAME, TABLENAME FROM informationschema.partitions WHERE TABLESCHEMA = 'yourdatabasename';

Replace `yourdatabasename` with the name of your database.

  1. Verify there are no foreign keys or other dependencies preventing the partition from being dropped. Use the following query to check for foreign key constraints:



SELECT TABLENAME, COLUMNNAME, CONSTRAINTNAME, REFERENCEDTABLENAME, REFERENCEDCOLUMN_NAME
FROM informationschema.KEYCOLUMN_USAGE
WHERE REFERENCEDTABLESCHEMA = 'yourdatabasename';

  1. Ensure there are no active transactions involving the partition. Check for active transactions with:



SHOW ENGINE INNODB STATUS;

Look under the `TRANSACTIONS` section for transactions that might be using the partition.

  1. If safe, attempt to remove any data dependencies or foreign keys before dropping the partition again. If it's a foreign key constraint, you may need to temporarily disable foreign key checks (be very cautious with this approach):



SET FOREIGNKEYCHECKS=0;
-- Your DROP PARTITION command here
SET FOREIGNKEYCHECKS=1;

Be sure to replace `-- Your DROP PARTITION command here` with your actual `DROP PARTITION` command.

  1. Finally, if the partition can be safely dropped (e.g., not in use, no dependencies), run the drop partition command again, ensuring you specify the correct partition name:



ALTER TABLE yourtablename DROP PARTITION partition_name;

Replace `yourtablename` with the name of your table and `partition_name` with the name of the partition you wish to drop.

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MySQL InnoDB Buffer Pool Issues
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MySQL Table/Index Fragmentation
Fragmented tables or indexes leading to slower performance due to inefficient data access paths. This can often be mitigated by running OPTIMIZE TABLE.
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MySQL High CPU/Memory Usage
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MySQL Connection Issues
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MySQL Lock Contention
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MySQL Slow Queries
Queries taking much longer than expected, especially under load or during complex operations like joins or large scans.
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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