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Update DB cleanup portion of drupal.md #9052

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Update DB cleanup portion of drupal.md #9052

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41 changes: 23 additions & 18 deletions source/content/addons/object-cache/howto/drupal.md
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Expand Up @@ -119,6 +119,26 @@ contributors: [cityofoaksdesign, carolynshannon, jms-pantheon, whitneymeredith]

</Alert>

```
### Database Cleanup (Recommended)

After enabling Redis, there are cache tables in the database that are no longer being used. Even when the Drupal cache is cleared, these tables will not be emptied. For sites that were live for awhile before Redis was enabled, there could be significant amounts of data in these tables. Removing this data could increase the speed of cloning, exporting, and backing up the database.

1. [Connect directly to MySQL](/guides/mariadb-mysql/mysql-access) and run the command below to view the cache:

```sql
SELECT table_name FROM information_schema.tables WHERE table_name LIKE 'cache%' AND table_name != 'cache_form';
```

This returns a list of all the cache tables in the database. These are safe to empty, but don't remove the tables themselves in case Redis is disabled in the future.

1. Run the command below on each table, replacing `<tablename>` with the name of the cache table, to empty the cache:

```sql
TRUNCATE TABLE `<tablename>`;
```


## Drupal 7

<Alert title="Note" type="info">
Expand Down Expand Up @@ -168,26 +188,11 @@ This configuration uses the `Redis_CacheCompressed` class for better performance

1. Visit `/admin/config/development/performance/redis` and open **Connection Information** to verify the connection.

<Accordion title="Database Cleanup (optional)" id="database-cleanup-d7" icon="lightbulb">

After enabling Redis, there are cache tables in the database that are no longer being used. Even when the Drupal cache is cleared, these tables will not be emptied. For sites that were live for awhile before Redis was enabled, there could be significant amounts of data in these tables. Removing this data could increase the speed of cloning, exporting, and backing up the database.

1. [Connect directly to MySQL](/guides/mariadb-mysql/mysql-access) and run the command below to view the cache:

```sql
SELECT table_name FROM information_schema.tables WHERE table_name LIKE 'cache%' AND table_name != 'cache_form';
```

This returns a list of all the cache tables in the database. These are safe to empty, but don't remove the tables themselves in case Redis is disabled in the future.

1. Run the command below on each table, replacing `<tablename>` with the name of the cache table, to empty the cache:

```sql
TRUNCATE TABLE `<tablename>`;
```
<Alert title="Note" type="info">

</Accordion>
Review the [Database Cleanup](#database-cleanup) section should be reviewed and implemented accordingly for Drupal 7 sites.

</Alert>

## More Resources
- [Performance Addons](/addons)
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