TDengine数据迁移

taosdump 是一个支持从运行中的 TDengine 集群备份数据并将备份的数据恢复到相同或另一个运行中的 TDengine 集群中的工具应用程序。

taosdump 可以用数据库、超级表或普通表作为逻辑数据单元进行备份，也可以对数据库、超级 表和普通表中指定时间段内的数据记录进行备份。使用时可以指定数据备份的目录路径，如果 不指定位置，taosdump 默认会将数据备份到当前目录。

如果指定的位置已经有数据文件，taosdump 会提示用户并立即退出，避免数据被覆盖。这意味着同一路径只能被用于一次备份。 如果看到相关提示，请小心操作。

一、taodump简介安装及使用

二、taoTools安装

安装包下载：https://docs.taosdata.com/releases/tools/

三、详细dump命令

Usage: taosdump [OPTION...] dbname [tbname ...]or:  taosdump [OPTION...] --databases db1,db2,...or:  taosdump [OPTION...] --all-databasesor:  taosdump [OPTION...] -i inpathor:  taosdump [OPTION...] -o outpath-h, --host=HOST            Server host dumping data from. Default islocalhost.-p, --password             User password to connect to server. Default istaosdata.-P, --port=PORT            Port to connect-u, --user=USER            User name used to connect to server. Default isroot.-c, --config-dir=CONFIG_DIR   Configure directory. Default is /etc/taos-i, --inpath=INPATH        Input file path.-o, --outpath=OUTPATH      Output file path.-r, --resultFile=RESULTFILE   DumpOut/In Result file path and name.-a, --allow-sys            Allow to dump system database-A, --all-databases        Dump all databases.-D, --databases=DATABASES  Dump inputted databases. Use comma to separatedatabases' name.-e, --escape-character     Use escaped character for database name-N, --without-property     Dump database without its properties.-s, --schemaonly           Only dump tables' schema.-d, --avro-codec=snappy    Choose an avro codec among null, deflate, snappy,and lzma.-S, --start-time=START_TIME   Start time to dump. Either epoch orISO8601/RFC3339 format is acceptable. ISO8601format example: 2017-10-01T00:00:00.000+0800 or2017-10-0100:00:00:000+0800 or '2017-10-0100:00:00.000+0800'-E, --end-time=END_TIME    End time to dump. Either epoch or ISO8601/RFC3339format is acceptable. ISO8601 format example:2017-10-01T00:00:00.000+0800 or2017-10-0100:00:00.000+0800 or '2017-10-0100:00:00.000+0800'-B, --data-batch=DATA_BATCH   Number of data per query/insert statement whenbackup/restore. Default value is 16384. If you see'error actual dump .. batch ..' when backup or ifyou see 'WAL size exceeds limit' error whenrestore, please adjust the value to a smaller oneand try. The workable value is related to thelength of the row and type of table schema.-I, --inspect              inspect avro file content and print on screen-L, --loose-mode           Using loose mode if the table name and column nameuse letter and number only. Default is NOT.-n, --no-escape            No escape char '`'. Default is using it.-Q, --dot-replace          Repalce dot character with underline character inthe table name.(Version 2.5.3)-T, --thread-num=THREAD_NUM   Number of thread for dump in file. Default is8.-C, --cloud=CLOUD_DSN      specify a DSN to access TDengine cloud service-R, --restful              Use RESTful interface to connect TDengine-t, --timeout=SECONDS      The timeout seconds for websocket to interact.-g, --debug                Print debug info.-?, --help                 Give this help list--usage                Give a short usage message-V, --version              Print program version-W, --rename=RENAME-LIST   Rename database name with new name duringimporting data. RENAME-LIST: "db1=newDB1|db2=newDB2" means rename db1 to newDB1and rename db2 to newDB2 (Version 2.5.4)Mandatory or optional arguments to long options are also mandatory or optional
for any corresponding short options.Report bugs to <support@taosdata.com>.

--查询TDengie中当前时间范围内的数据
select count(*) from 超级表 where time >='2024-01-01T00:00:00.000+0800' and time <= '2024-06-30T23:59:59.000+0800';
本次导出数量：3378
总数量：7383--查询TDengine当前时间范围内的数据
select count(*) from 超级表 where time >='2024-01-01T00:00:00.000+0800' and time <= '2024-06-30T23:59:59.000+0800';
本次导出数量：3701
总数量：3944当前时间范围内数据导出
taosdump -D 数据库名 -o /home/taosdata -S 2024-01-01T00:00:00.000+0800 -E 2024-06-30T23:59:59.000+0800恢复当前导出的数据到另外一台TDengine（测试时使用的是我本地的虚拟机中安装的TDengine）
taosdump -u root -p 123456 -i /home/taosdata

--TDengine中剩余数据：4005
select count(*) from 超级表 where time >= '2023-01-01T00:00:00.000+0800' and time < '2024-01-01T00:00:00.000+0800';--TDengine中剩余数据：243
select count(*) from 超级表 where time >= '2023-01-01T00:00:00.000+0800' and time < '2024-01-01T00:00:00.000+0800';--当前时间范围内的数据量
taosdump -D 数据库 -o /home/taosdata -S 2023-01-01T00:00:00.000+0800 -E 2024-01-01T00:00:00.000+0800恢复当前导出的数据到另外一台TDengine（测试时使用的是我本地的虚拟机中安装的TDengine）
taosdump -u root -p 123456 -i /home/taosdata

select count(*) from stb_charging_working_data;
select count(*) from stb_cp_chargingparameter_rpt_data;