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system-variables: add documents for error_count and max_connections #10525

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Oct 8, 2022
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system-variables: add documents for error_count and max_connections #10525

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system-variables: add documents for `error_count` and `max_connections`
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TomShawn Oct 8, 2022
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22 changes: 19 additions & 3 deletions system-variables.md
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Expand Up @@ -225,6 +225,12 @@ For more possible values of this variable, see [Authentication plugin status](/s
- Range: `[0, 7]`
- Sets the week format used by the `WEEK()` function.

### error_count

- Scope: NONE
- Type: Integer
- A read-only variable that indicates the number of errors that resulted from the last statement that generated messages.

### foreign_key_checks

- Scope: SESSION | GLOBAL
Expand Down Expand Up @@ -335,6 +341,16 @@ This variable is an alias for `last_insert_id`.
- Unit: Bytes
- The maximum size of a packet for the MySQL protocol.

### max_connections

- Scope: GLOBAL
- Persists to cluster: No
- Type: Integer
- Default value: `0`
- Range: `[0, 100000]`
- The maximum number of connections for a single TiDB instance.
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- The value of `0` means no limit.

### max_execution_time

- Scope: SESSION | GLOBAL
Expand Down Expand Up @@ -501,19 +517,19 @@ mysql> SHOW GLOBAL VARIABLES LIKE 'max_prepared_stmt_count';

- Scope: NONE
- Default value: ""
- The location of the certificate authority file (if there is one).
- The location of the certificate authority file (if there is one), the value of this variable is defined by [`ssl-ca` configuration](https://docs.pingcap.com/tidb/dev/tidb-configuration-file#ssl-ca).
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### ssl_cert

- Scope: NONE
- Default value: ""
- The location of the certificate file (if there is a file) that is used for SSL/TLS connections.
- The location of the certificate file (if there is a file) that is used for SSL/TLS connections, the value of this variable is defined by [`ssl-cert` configuration](https://docs.pingcap.com/tidb/dev/tidb-configuration-file#ssl-cert).
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### ssl_key

- Scope: NONE
- Default value: ""
- The location of the private key file (if there is one) that is used for SSL/TLS connections.
- The location of the private key file (if there is one) that is used for SSL/TLS connections, the value of this variable is defined by [`ssl-key` configuration](https://docs.pingcap.com/tidb/dev/tidb-configuration-file#ssl-cert).
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### system_time_zone

Expand Down