Reconfigure temporary table settings

MySQL   |  PostgreSQL   |  SQL Server

Preview — Gemini in Databases

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This page describes how to manage the number of temporary tables. This recommender is called Reconfigure temp table settings.

Every day, this recommender analyzes the number of temporary tables created on disk compared to the total number of temporary tables. If the number of temporary tables created on disk is more than 20% of the total number of tables, then this recommender advises you to do one of the following:

• Increase the value of either the tmp_table_size flag or the max_heap_table_size flag, or both flags.

• If the values for max_heap_tmp_table_size and tmp_table_size aren't equal, then increase the smaller value to match the larger value.

• If the values for max_heap_tmp_table_size and tmp_table_size are the same, increase both of them to a larger value.

For more information on increasing the value of tmp_table_size, see tmp_table_size.

Important: This recommender is only available if you have enabled Gemini in Databases. For more information on enabling Gemini in Databases, see Set up Database Center.

Pricing

The Reconfigure temp table settings recommender is in the Standard Recommender pricing tier.

Before you begin

Enable the Recommender API.

Required roles and permissions

To get the permissions to view and work with insights and recommendations, ensure that you have the required Identity and Access Management (IAM) roles.

Task	Role
View recommendations	recommender.cloudsqlViewer or cloudsql.admin
Apply recommendations	cloudsql.editor or cloudsql.admin

For more information about IAM roles, see IAM basic and predefined roles reference and Manage access to projects, folders, and organizations.

List the recommendations

To list the recommendations, follow these steps:

Console

To list recommendations about instance performance, follow these steps:

1. Go to the Cloud SQL Instances page.

Go to Cloud SQL Instances

1. On the Improve instance health by investigating issues and acting on recommendations banner, click Expand Details .

Alternatively, follow these steps:

1. Go to the Recommendation Hub. See also Find and apply recommendations with the Recommendations.

   Go to the Recommendation Hub

2. In the All recommendations card, click Performance .

gcloud

Run the gcloud recommender recommendations list command as follows:

gcloud recommender recommendations list \
--project=PROJECT_ID \
--location=LOCATION \
--recommender=google.cloudsql.instance.PerformanceRecommender \
--filter=recommenderSubtype=MYSQL_RECONFIG_TMP_TABLES

Replace the following:

• PROJECT_ID: your project ID
• LOCATION: a region where your instances are located, such as us-central1

API

Call the recommendations.list method as follows:

GET https://recommender.googleapis.com/v1/projects/PROJECT_ID/locations/LOCATION/recommenders/google.cloudsql.instance.PerformanceRecommender/recommendations

Replace the following:

• PROJECT_ID: your project ID
• LOCATION: a region where your instances are located, such as us-central1

View insights and detailed recommendations

To view insights and detailed recommendations, follow these steps:

Console

Do one of the following:

• On the Performance Recommendations page, click the Performance recommendations card and then click Reconfigure temp table settings. The recommendation panel appears, which contains insights and detailed recommendations for the instance.

• On the Instances page, click Reconfigure temp table settings. The list of instances displays only those instances for which the recommendation applies.

gcloud

Run the gcloud recommender insights list command as follows:

gcloud recommender insights list \
--project=PROJECT_ID \
--location=LOCATION \
--insight-type=google.cloudsql.instance.PerformanceInsight \
--filter=insightSubtype=INSIGHT_SUBTYPE

Replace the following:

• PROJECT_ID: your project ID
• LOCATION: a region where your instances are located, such as us-central1
• INSIGHT_SUBTYPE: set this parameter to one of the following:
  • MYSQL_HIGH_NUMBER_OF_TMP_TABLE_ON_DISK_TMP_TABLE: display insights for the total number of temporary tables on disk for your instance
  • MYSQL_HIGH_NUMBER_OF_TMP_TABLE_ON_DISK_MAX_HEAP: display insights for the total number of user-created temporary tables on disk for your instance

API

Call the insights.list method as follows:

GET https://recommender.googleapis.com/v1/projects/PROJECT_ID/locations/LOCATION/insightTypes/google.cloudsql.instance.PerformanceInsight/insights

Replace the following:

• PROJECT_ID: your project ID
• LOCATION: a region where your instances are located, such as us-central1

Apply the recommendation

To implement this recommendation, do one of the following:

• If the values for themax_heap_tmp_table_size and tmp_table_size flags are not equal, then increase the smaller value to match the larger value.

• If the values for themax_heap_tmp_table_size and tmp_table_size flags are the same, increase both of them to larger values.

Note: Increasing tmp_table_size and max_heap_tmp_table_size requires more memory. After increasing these flags, monitor the memory usage.

What's next

• Google Cloud recommenders