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tools: add one syncer check description (#1659)

* tools: add one syncer check description

* address comment

* tools: fix a typo
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TomShawn authored and lilin90 committed Nov 22, 2019
1 parent 8d8880c commit a5e0a49a54e4e8b4b05182f3ceea9ac180138ead
@@ -464,6 +464,10 @@ Before replicating data using Syncer, check the following items:

TiDB differs from MySQL in [Character Set](/dev/reference/sql/character-set.md).

7. Check whether the table to be replicated has a primary key or a unique index.

If the table does not have a primary key or a unique index, idempotent operations cannot be achieved. In this situation, a full table scan is performed every time an entry of data is updated in the downstream, which might slow down the replication task. Therefore, it is recommended that you add a primary key to every table to be replicated.

## Syncer monitoring solution

The `syncer` monitoring solution contains the following components:
@@ -464,6 +464,10 @@ Before replicating data using Syncer, check the following items:

TiDB differs from MySQL in [Character Set](/v2.1/reference/sql/character-set.md).

7. Check whether the table to be replicated has a primary key or a unique index.

If the table does not have a primary key or a unique index, idempotent operations cannot be achieved. In this situation, a full table scan is performed every time an entry of data is updated in the downstream, which might slow down the replication task. Therefore, it is recommended that you add a primary key to every table to be replicated.

## Syncer monitoring solution

The `syncer` monitoring solution contains the following components:
@@ -465,6 +465,10 @@ Before replicating data using Syncer, check the following items:

TiDB differs from MySQL in [Character Set](/v3.0/reference/sql/character-set.md).

7. Check whether the table to be replicated has a primary key or a unique index.

If the table does not have a primary key or a unique index, idempotent operations cannot be achieved. In this situation, a full table scan is performed every time an entry of data is updated in the downstream, which might slow down the replication task. Therefore, it is recommended that you add a primary key to every table to be replicated.

## Syncer monitoring solution

The `syncer` monitoring solution contains the following components:
@@ -464,6 +464,10 @@ Before replicating data using Syncer, check the following items:

TiDB differs from MySQL in [Character Set](/v3.1/reference/sql/character-set.md).

7. Check whether the table to be replicated has a primary key or a unique index.

If the table does not have a primary key or a unique index, idempotent operations cannot be achieved. In this situation, a full table scan is performed every time an entry of data is updated in the downstream, which might slow down the replication task. Therefore, it is recommended that you add a primary key to every table to be replicated.

## Syncer monitoring solution

The `syncer` monitoring solution contains the following components:

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