# Dumpling Performance Optimization __*Dumpling performance optimization*__ __*Dumpling -t*__ __*dumpling -r*__ + -t is used to specify the number of threads to export. Increasing the number of threads increases dumpling concurrency and increases export speed, but it also increases database memory consumption, so it is not advisable to set it too large. + The -r option specifies the maximum number of records in a single file, or rows in the database. When enabled, dumpling will enable intra-table concurrency, improving the speed of exporting large tables. ------------------------------------------------------------- By default, exported files are stored in. /export- directory. The commonly used options are as follows: -t is used to specify the number of threads to export. Increasing the number of threads increases dumpling concurrency and increases export speed, but it also increases database memory consumption, so it is not advisable to set it too large. The -r option specifies the maximum number of records in a single file, or rows in the database. When enabled, dumpling will enable intra-table concurrency, improving the speed of exporting large tables. When the upstream is TiDB and the version is v3.0 or later, the parameter greater than 0 indicates that the TiDB region information is used to divide the concurrency in the table, and the specific value will no longer be valid. The —compress gzip option can be used to compress the exported data. Compression can significantly reduce the size of the exported data, and can be used to speed up the export if the storage does not have enough write I/O bandwidth. However, this option has the side effect of increasing CPU consumption because it compresses each file separately. The above options can be used to speed up the export of dumpling.