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doc: add example for show table distributed

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gccgdb1234 2022-12-23 16:50:22 +08:00
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docs/en/12-taos-sql/24-show.md
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@ -178,6 +178,77 @@ SHOW TABLE DISTRIBUTED table_name;
Shows how table data is distributed.
Examples： show table distributed d0\G; Display the block distribution of table `d0` in detailed format.
*************************** 1.row ***************************
_block_dist: Total_Blocks=[5] Total_Size=[93.65 Kb] Average_size=[18.73 Kb] Compression_Ratio=[23.98 %]
Total_Blocks : Table `d0` contains total 5 blocks
Total_Size: The total size of all the data blocks in table `d0` is 93.65 KB
Average_size: The average size of each block is 18.73 KB
Compression_Ratio: The data compression rate is 23.98%
*************************** 2.row ***************************
_block_dist: Total_Rows=[20000] Inmem_Rows=[0] MinRows=[3616] MaxRows=[4096] Average_Rows=[4000]
Total_Rows: Table `d0` contains 20,000 rows
Inmem_Rows： The rows still in memory, i.e. not committed in disk, is 0, i.e. none such rows
MinRows： The minimum number of rows in a block is 3,616
MaxRows： The maximum number of rows in a block is 4,096B
Average_Rows： The average number of rows in a block is 4,000
*************************** 3.row ***************************
_block_dist: Total_Tables=[1] Total_Files=[2]
Total_Tables: The number of child tables, 1 in this example
Total_Files： The number of files storing the table's data, 2 in this example
*************************** 4.row ***************************
_block_dist: --------------------------------------------------------------------------------
*************************** 5.row ***************************
_block_dist: 0100 |
*************************** 6.row ***************************
_block_dist: 0299 |
*************************** 7.row ***************************
_block_dist: 0498 |
*************************** 8.row ***************************
_block_dist: 0697 |
*************************** 9.row ***************************
_block_dist: 0896 |
*************************** 10.row ***************************
_block_dist: 1095 |
*************************** 11.row ***************************
_block_dist: 1294 |
*************************** 12.row ***************************
_block_dist: 1493 |
*************************** 13.row ***************************
_block_dist: 1692 |
*************************** 14.row ***************************
_block_dist: 1891 |
*************************** 15.row ***************************
_block_dist: 2090 |
*************************** 16.row ***************************
_block_dist: 2289 |
*************************** 17.row ***************************
_block_dist: 2488 |
*************************** 18.row ***************************
_block_dist: 2687 |
*************************** 19.row ***************************
_block_dist: 2886 |
*************************** 20.row ***************************
_block_dist: 3085 |
*************************** 21.row ***************************
_block_dist: 3284 |
*************************** 22.row ***************************
_block_dist: 3483 ||||||||||||||||| 1 (20.00%)
*************************** 23.row ***************************
_block_dist: 3682 |
*************************** 24.row ***************************
_block_dist: 3881 ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 4 (80.00%)
Query OK, 24 row(s) in set (0.002444s)
The above show the block distribution percentage according to the number of rows in each block. In the above example, `_block_dist: 3483 ||||||||||||||||| 1 (20.00%)` means there is one block whose rows is between 3,483 and 3,681. `_block_dist: 3881 ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 4 (80.00%)` means there are 4 blocks whose rows is between 3,881 and 4,096. The number of blocks whose rows fall in other range is zero.
## SHOW TAGS
```sql