Go to the `C:\TDengine` directory from `cmd` and execute TDengine CLI program `taos.exe` directly to connect to the TDengine service and enter the TDengine CLI interface, for example, as follows:
```text
C:\TDengine>taos
Welcome to the TDengine shell from Linux, Client Version:2.0.5.0
Copyright (c) 2017 by TAOS Data, Inc. All rights reserved.
taos> show databases;
name | created_time | ntables | vgroups | replica | quorum | days | keep1,keep2,keep(D) | cache(MB) | blocks | minrows | maxrows | wallevel | fsync | comp | precision | status |
@@ -29,7 +29,7 @@ There are two ways to install taosdump:
1. backing up all databases: specify `-A` or `-all-databases` parameter.
2. backup multiple specified databases: use `-D db1,db2,... ` parameters;
3. back up some super or normal tables in the specified database: use `-dbname stbname1 stbname2 tbname1 tbname2 ... ` parameters. Note that the first parameter of this input sequence is the database name, and only one database is supported. The second and subsequent parameters are the names of super or normal tables in that database, separated by spaces.
3. back up some super or normal tables in the specified database: use `dbname stbname1 stbname2 tbname1 tbname2 ... ` parameters. Note that the first parameter of this input sequence is the database name, and only one database is supported. The second and subsequent parameters are the names of super or normal tables in that database, separated by spaces.
4. back up the system log database: TDengine clusters usually contain a system database named `log`. The data in this database is the data that TDengine runs itself, and the taosdump will not back up the log database by default. If users need to back up the log database, users can use the `-a` or `-allow-sys` command-line parameter.
5. Loose mode backup: taosdump version 1.4.1 onwards provides `-n` and `-L` parameters for backing up data without using escape characters and "loose" mode, which can reduce the number of backups if table names, column names, tag names do not use escape characters. This can also reduce the backup data time and backup data footprint. If you are unsure about using `-n` and `-L` conditions, please use the default parameters for "strict" mode backup. See the [official documentation](/taos-sql/escape) for a description of escaped characters.
@@ -16,6 +16,7 @@ The following preparations are required for EMQX to add TDengine data sources co
Depending on the current operating system, users can download the installation package from the [EMQX official website](https://www.emqx.io/downloads) and execute the installation. After installation, use `sudo emqx start` or `sudo systemctl start emqx` to start the EMQX service.
Note: this chapter is based on EMQX v4.4.5. Other version of EMQX probably change its user interface, configuration methods or functions.
## Create Database and Table
...
...
@@ -31,7 +32,7 @@ Note: The table schema is based on the blog [(In Chinese) Data Transfer, Storage
## Configuring EMQX Rules
Since the configuration interface of EMQX differs from version to version, here is v4.4.3 as an example. For other versions, please refer to the corresponding official documentation.
Since the configuration interface of EMQX differs from version to version, here is v4.4.5 as an example. For other versions, please refer to the corresponding official documentation.
`void udfNormalFunc(char* data, short itype, short ibytes, int numOfRows, long long* ts, char* dataOutput, char* interBuf, char* tsOutput, int* numOfOutput, short otype, short obytes, SUdfInit* buf)`
dError("free disk size: %f GB, too little, require %f GB at least at least , quit",(double)tsDataSpace.size.avail/1024.0/1024.0/1024.0,(double)tsDataSpace.reserved/1024.0/1024.0/1024.0);
returnfalse;
}
if(!osLogSpaceAvailable()){
dError("free disk size: %f GB, too little, require %f GB at least at least, quit",(double)tsLogSpace.size.avail/1024.0/1024.0/1024.0,(double)tsLogSpace.reserved/1024.0/1024.0/1024.0);
returnfalse;
}
if(!osTempSpaceAvailable()){
dError("free disk size: %f GB, too little, require %f GB at least at least, quit",(double)tsTempSpace.size.avail/1024.0/1024.0/1024.0,(double)tsTempSpace.reserved/1024.0/1024.0/1024.0);
