Add TiDB limitations by TomShawn · Pull Request #2899 · pingcap/docs

TomShawn · 2020-06-16T07:06:02Z

What is changed, added or deleted? (Required)

Add TiDB limitations.

Which TiDB version(s) do your changes apply to? (Required)

What is the related PR or file link(s)?

This PR is translated from: Update overview.md docs-cn#3166 update key word docs-cn#3635
Other reference link(s):

lilin90 · 2020-06-16T08:29:17Z

@@ -0,0 +1,74 @@
+---
+title: TiDB Limitations
+summary: Learn the limitations of TiDB.


Suggested change

summary: Learn the limitations of TiDB.

summary: Learn the usage limitations of TiDB.

lilin90 · 2020-06-16T08:30:52Z

+
+# TiDB Limitations
+
+This document describes the common limitations of TiDB, including the maximum identifier length and the maximum count of supported databases, tables, indexes, partitioned tables, and sequences.


Suggested change

This document describes the common limitations of TiDB, including the maximum identifier length and the maximum count of supported databases, tables, indexes, partitioned tables, and sequences.

This document describes the common usage limitations of TiDB, including the maximum identifier length and the maximum number of supported databases, tables, indexes, partitioned tables, and sequences.

lilin90 · 2020-06-16T08:35:41Z

+
+This document describes the common limitations of TiDB, including the maximum identifier length and the maximum count of supported databases, tables, indexes, partitioned tables, and sequences.
+
+## Limitation on identifier length


Suggested change

## Limitation on identifier length

## Limitations on identifier length

lilin90 · 2020-06-16T08:36:42Z

+
+## Limitation on identifier length
+
+| Identifier type | Maximum length (character) |


lilin90 · 2020-06-16T08:37:47Z

+| View     | 64 |
+| Sequence | 64 |
+
+## Limitation on the total count of databases, tables, views, and connections


Suggested change

## Limitation on the total count of databases, tables, views, and connections

## Limitations on the total number of databases, tables, views, and connections

lilin90 · 2020-06-16T08:39:59Z

+## Limitation on a single row
+
+| Type       | Upper limit   |
+|:----------|:----------|
+| Size       | 6 MB       |
+
+## Limitation on a single column
+
+| Type       | Upper limit   |
+|:----------|:----------|
+| Size       | 6 MB       |
+
+## Limitation on string types


In this context, the plural form of limitation is more commonly used. Please pay attention to this word.

lilin90 · 2020-06-16T08:41:44Z

+| BINARY     | 256 characters      |
+| VARBINARY  | 65535 characters    |
+| VARCHAR    | 16383 characters    |
+| TEXT       | 6MB bytes      |


lilin90 · 2020-06-16T08:41:55Z

+| VARBINARY  | 65535 characters    |
+| VARCHAR    | 16383 characters    |
+| TEXT       | 6MB bytes      |
+| BLOB       | 6MB bytes      |


lilin90 · 2020-06-16T08:42:35Z

+| TEXT       | 6MB bytes      |
+| BLOB       | 6MB bytes      |
+
+## Limitation on SQL statements


lilin90 · 2020-06-16T08:45:27Z

+
+| Type       | Upper limit   |
+|:----------|:----------|
+| The number of SQL statements in a single transaction |  When the optimistic transaction is used and the transaction retry is enabled, the default upper limit is 5000, which can be changed through [`stmt-count-limit`](/tidb-configuration-file.md#stmt-count-limit). |


Some meaning is missed. Try to be clearer in each column.

Suggested change

| The number of SQL statements in a single transaction | When the optimistic transaction is used and the transaction retry is enabled, the default upper limit is 5000, which can be changed through [`stmt-count-limit`](/tidb-configuration-file.md#stmt-count-limit). |

| The maximum number of SQL statements in a single transaction | When the optimistic transaction is used and the transaction retry is enabled, the default upper limit is 5000, which can be modified using [`stmt-count-limit`](/tidb-configuration-file.md#stmt-count-limit). |

TomShawn · 2020-06-16T10:30:47Z

@lilin90 Comments addressed, PTAL again, thanks!

lilin90

One comment was ignored.

lilin90

LGTM

lilin90 · 2020-06-16T15:05:58Z

/merge

ti-srebot · 2020-06-16T15:08:21Z

/run-all-tests

Signed-off-by: ti-srebot <ti-srebot@pingcap.com>

ti-srebot · 2020-06-16T15:12:56Z

cherry pick to release-4.0 in PR #2916

Signed-off-by: ti-srebot <ti-srebot@pingcap.com> Co-authored-by: TomShawn <41534398+TomShawn@users.noreply.github.com>

TomShawn added 2 commits June 16, 2020 15:00

Add TiDB limitations

c620cb8

Update tidb-limitations.md

f8f2b67

TomShawn added translation/from-docs-cn This PR is translated from a PR in pingcap/docs-cn. needs-cherry-pick-4.0 special-week PR from Document Special Week. labels Jun 16, 2020

TomShawn requested review from kissmydb, scsldb and yikeke June 16, 2020 07:06

yikeke requested a review from lilin90 June 16, 2020 07:06

Merge branch 'master' into tidb-limit

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yikeke removed their request for review June 16, 2020 07:32

lilin90 reviewed Jun 16, 2020

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lilin90 added the status/require-change Needs the author to address comments. label Jun 16, 2020

address comments from lilian

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TomShawn added status/PTAL This PR is ready for reviewing. and removed status/require-change Needs the author to address comments. labels Jun 16, 2020

lilin90 reviewed Jun 16, 2020

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Comment thread tidb-limitations.md Outdated

Update tidb-limitations.md

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lilin90 approved these changes Jun 16, 2020

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ti-srebot added the status/can-merge Indicates a PR has been approved by a committer. label Jun 16, 2020

Merge branch 'master' into tidb-limit

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ti-srebot merged commit bf258db into pingcap:master Jun 16, 2020

ti-srebot pushed a commit to ti-srebot/docs that referenced this pull request Jun 16, 2020

cherry pick pingcap#2899 to release-4.0

51b3685

Signed-off-by: ti-srebot <ti-srebot@pingcap.com>

ti-srebot mentioned this pull request Jun 16, 2020

Add TiDB limitations (#2899) #2916

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lilin90 pushed a commit that referenced this pull request Jun 16, 2020

cherry pick #2899 to release-4.0 (#2916)

00bd9ce

Signed-off-by: ti-srebot <ti-srebot@pingcap.com> Co-authored-by: TomShawn <41534398+TomShawn@users.noreply.github.com>

	summary: Learn the limitations of TiDB.
	summary: Learn the usage limitations of TiDB.


		# TiDB Limitations

		This document describes the common limitations of TiDB, including the maximum identifier length and the maximum count of supported databases, tables, indexes, partitioned tables, and sequences.

	This document describes the common limitations of TiDB, including the maximum identifier length and the maximum count of supported databases, tables, indexes, partitioned tables, and sequences.
	This document describes the common usage limitations of TiDB, including the maximum identifier length and the maximum number of supported databases, tables, indexes, partitioned tables, and sequences.


		This document describes the common limitations of TiDB, including the maximum identifier length and the maximum count of supported databases, tables, indexes, partitioned tables, and sequences.

		## Limitation on identifier length

	## Limitation on identifier length
	## Limitations on identifier length


		## Limitation on identifier length

		\| Identifier type \| Maximum length (character) \|

	\| Identifier type \| Maximum length (character) \|
	\| Identifier type \| Maximum length (number of characters allowed) \|

	## Limitation on the total count of databases, tables, views, and connections
	## Limitations on the total number of databases, tables, views, and connections

	\| The number of SQL statements in a single transaction \| When the optimistic transaction is used and the transaction retry is enabled, the default upper limit is 5000, which can be changed through [`stmt-count-limit`](/tidb-configuration-file.md#stmt-count-limit). \|
	\| The maximum number of SQL statements in a single transaction \| When the optimistic transaction is used and the transaction retry is enabled, the default upper limit is 5000, which can be modified using [`stmt-count-limit`](/tidb-configuration-file.md#stmt-count-limit). \|

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TomShawn commented Jun 16, 2020 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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lilin90 commented Jun 16, 2020

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TomShawn commented Jun 16, 2020 •

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