[GitHub] [shardingsphere] strongduanmu edited a comment on issue #10108: Using Oracle database, the program starts to check the table that has not been created

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strongduanmu edited a comment on issue #10108:
URL: https://github.com/apache/shardingsphere/issues/10108#issuecomment-823001092


   > Hi @strongduanmu could you look at this one? My impression that `INDEX` metadata loading was in your charge?
   
   Hi @ljwps, thank you very much for your feedback.
   
   The physical table `FAQ_LOG_20210416` corresponding to the logical table `FAQ_LOG` needs to be created in advance, because some metadata of the sharding table needs to be loaded when starting.
   
   For details, please refer to the ShardingMetaDataLoader class.
   
   ```java
   public TableMetaData load(final String logicTableName, final DatabaseType databaseType) throws SQLException {
       TableRule tableRule = shardingRule.getTableRule(logicTableName);
       if (!isCheckingMetaData) {
           DataNode dataNode = tableRule.getActualDataNodes().iterator().next();
           return TableMetaDataLoader.load(dataSourceMap.get(shardingRule.getShardingDataSourceNames().getRawMasterDataSourceName(
               dataNode.getDataSourceName())), dataNode.getTableName(), databaseType.getName());
       }
       Map<String, List<DataNode>> dataNodeGroups = tableRule.getDataNodeGroups();
       Map<String, TableMetaData> actualTableMetaDataMap = new HashMap<>(dataNodeGroups.size(), 1);
       Map<String, Future<TableMetaData>> tableFutureMap = new HashMap<>(dataNodeGroups.size(), 1);
       ExecutorService executorService = Executors.newFixedThreadPool(Math.min(CORES * 2, dataNodeGroups.size()));
       for (Entry<String, List<DataNode>> entry : dataNodeGroups.entrySet()) {
           for (DataNode each : entry.getValue()) {
               Future<TableMetaData> futures = executorService.submit(() -> load(each, databaseType));
               tableFutureMap.put(each.getTableName(), futures);
           }
       }
       ...
   }
   ```


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