description:This article describes how to install TDengine and test its performance.
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You can install and run TDengine on Linux/Windows/macOS machines as well as Docker containers. You can also deploy TDengine as a managed service with TDengine Cloud.
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The schemaless writing method creates super tables and their corresponding subtables. These are completely indistinguishable from the super tables and subtables created directly via SQL. You can write data directly to them via SQL statements. Note that the names of tables created by schemaless writing are based on fixed mapping rules for tag values, so they are not explicitly ideographic and they lack readability.
Tips:
The schemaless write will automatically create a table. You do not need to create a table manually, or an unknown error may occur.
## Schemaless Writing Line Protocol
TDengine's schemaless writing line protocol supports InfluxDB's Line Protocol, OpenTSDB's telnet line protocol, and OpenTSDB's JSON format protocol. However, when using these three protocols, you need to specify in the API the standard of the parsing protocol to be used for the input content.
TDengine is a high-efficient, scalable, high-available distributed time-series database, which makes a lot of optimizations on inserting and querying data, which is far more efficient than normal regular databases. So TDengine can meet the high requirements of IOT and other areas on storing and querying a large amount of data.
TDengine will be installed under C:\TDengine, users can modify configuration file C:\TDengine\cfg\taos.cfg, set the log file path or other parameters.
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TDengine will be installed under C:\TDengine, users can modify configuration file C:\TDengine\cfg\taos.cfg, set the log file path or other parameters.
To start/stop TDengine with administrator privileges: sc start/stop taosd
To start/stop taosAdapter with administrator privileges: sc start/stop taosadapter
Please manually remove C:\TDengine from your system PATH environment after you remove TDengine software.
## stb + interval + fill + group by + limit offset
sql select max(c1), min(c2), sum(c3), avg(c4), first(c7), last(c8), first(c9) from $stb where ts >= $ts0 and ts <= $tsu interval(5m) fill(value, -1, -2) group by t1 limit 2 offset 10
if $rows != 20 then
sql select max(c1), min(c2), sum(c3), avg(c4), first(c7), last(c8), first(c9) from $stb where ts >= $ts0 and ts <= $tsu partition by t1 interval(5m) fill(value, -1, -2, -3, -4 ,-7 ,'-8', '-9') limit 2 offset 10
if $rows != 2 then
return -1
endi
#add one more test case
sql select max(c1), last(c8) from lm2_db0.lm2_tb0 where ts >= 1537146000000 and ts <= 1543145400000 interval(5m) fill(linear) limit 10 offset 4089;"
$limit = 5
$offset = $rowNum * 2
$offset = $offset - 2
sql select max(c1), min(c2), sum(c3), avg(c4), first(c7), last(c8), first(c9) from $stb where ts >= $ts0 and ts <= $tsu interval(5m) fill(value, -1, -2) group by t1 order by t1 limit $limit offset $offset
sql select max(c1), min(c2), sum(c3), avg(c4), first(c7), last(c8), first(c9) from $stb where ts >= $ts0 and ts <= $tsu partition by t1 interval(5m) fill(value, -1, -2, -3, -4 ,-7 ,'-8', '-9') order by t1 limit $limit offset $offset
