Address comments

docs/design/2021-04-26-lock-view.md

@@ -37,7 +37,7 @@ Several tables will be provided in `information_schema`. Some tables has both lo
 |------------|------------|---------|
 | `TRX_ID`    | `unsigned bigint`   | The transaction ID (aka. start ts) |
 | `TRX_STARTED`|`time`| Human readable start time of the transaction |
-| `CURRENT_SQL_DIGEST`|`text`| The digest of the current executing SQL statement |
+| `CURRENT_SQL_DIGEST`|`varchar(64)`| The digest of the current executing SQL statement |
 | `ALL_SQL_DIGESTS` | `text` | A list of all executed SQL statements' digests |
 | `STATE`| `enum('Running', 'Lock waiting', 'Committing', 'RollingBack')`| The state of the transaction |
 | `WAITING_START_TIME` | `time` | The elapsed time since the start of the current lock waiting (if any) |
@@ -67,7 +67,7 @@ Several tables will be provided in `information_schema`. Some tables has both lo
 |------------|------------|---------|
 | `KEY`      | `varchar`  | The key that's being waiting on |
 | `TRX_ID`   | `unsigned bigint` | The current transaction that's waiting for the lock |
-| `SQL_DIGEST` | `text` | The digest of the SQL that's trying to acquire the lock |
+| `SQL_DIGEST` | `varchar(64)` | The digest of the SQL that's trying to acquire the lock |
 | `CURRENT_HOLDING_TRX_ID` | `unsigned bigint` | The transaction that's holding the lock and blocks the current transaction |
 
 * Life span of rows:
@@ -108,7 +108,7 @@ Several tables will be provided in `information_schema`. Some tables has both lo
 
 | Field      | Type       | Comment |
 |------------|------------|---------|
-| `DIGEST` | `bigint` | Digest of a transaction, calculated with `ALL_SQL_DIGEST` |
+| `DIGEST` | `varchar(64)` | Digest of a transaction, calculated with `ALL_SQL_DIGEST` |
 | `ALL_SQL_DIGEST`  | `text` | A json array which contains all SQLs' digest executed in this kind of transaction |
 
 * Life span of rows:
@@ -123,7 +123,7 @@ Several tables will be provided in `information_schema`. Some tables has both lo
 
 | Field      | Type       | Comment |
 |------------|------------|---------|
-| `DIGEST` | `bigint` | Digest of a transaction, calculated with `ALL_SQL_DIGEST` |
+| `DIGEST` | `varchar(64)` | Digest of a transaction, calculated with `ALL_SQL_DIGEST` |
 | `TRX_ID`  | `bigint` | The transaction ID (aka. start ts) |
 
 * Life span of rows:
@@ -208,7 +208,7 @@ Value: 0 (do not collect) or 1 (collect)
 
 Default: 0
 
-#### TiDB Config File `pessimistic-txn.transaction-id-digest-capacity`
+#### TiDB Config File `transaction-summary.transaction-id-digest-capacity`
 
 Specifies how many transaction in `transaction_id_digest` each TiDB node should keep.
 
@@ -218,7 +218,7 @@ Value: 0 to 100000
 
 Default: 10000
 
-#### TiDB Config File `pessimistic-txn.transaction-id-digest-filter`
+#### TiDB Config File `transaction-summary.transaction-id-digest-min-duration`
 
 Specifies how long a transaction should be executed to make it be recorded in `transaction_id_digest`.
 
@@ -230,7 +230,7 @@ Unit: ms
 
 Default: 1000
 
-#### TiDB Config File `pessimistic-txn.transaction-summary-capacity`
+#### TiDB Config File `transaction-summary.transaction-summary-capacity`
 
 Specifies how many transaction summary in `transaction_summary` each TiDB node should keep.