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-databases
  or:  taosdump [OPTION...] -i inpath
  or:  taosdump [OPTION...] -o outpath
 
  -h, --host=HOST            Server host dumping data from. Default is
                             localhost.
  -p, --password             User password to connect to server. Default is
                             taosdata.
  -P, --port=PORT            Port to connect
  -u, --user=USER            User name used to connect to server. Default is
                             root.
  -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 separate
                             databases' 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 or
                             ISO8601/RFC3339 format is acceptable. ISO8601
                             format example: 2017-10-01T00:00:00.000+0800 or
                             2017-10-0100:00:00:000+0800 or '2017-10-01
                             00:00:00.000+0800'
  -E, --end-time=END_TIME    End time to dump. Either epoch or ISO8601/RFC3339
                             format is acceptable. ISO8601 format example:
                             2017-10-01T00:00:00.000+0800 or
                             2017-10-0100:00:00.000+0800 or '2017-10-01
                             00:00:00.000+0800'
  -B, --data-batch=DATA_BATCH   Number of data per query/insert statement when
                             backup/restore. Default value is 16384. If you see
                             'error actual dump .. batch ..' when backup or if
                             you see 'WAL size exceeds limit' error when
                             restore, please adjust the value to a smaller one
                             and try. The workable value is related to the
                             length 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 name
                             use 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 in
                             the table name.(Version 2.5.3)
  -T, --thread-num=THREAD_NUM   Number of thread for dump in file. Default is
                             8.
  -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 during
                             importing data. RENAME-LIST: 
                             "db1=newDB1|db2=newDB2" means rename db1 to newDB1
                             and 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;