Limitation of versionRetentionPeriod in Cloud Spanner PiTR

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What is the limitation and cost of using versionRetentionPeriod in Cloud Spanner Point-in-time recovery (PITR)?

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Naren Mehra On

versionRetentionPeriod can be increased to up to 7 days. Here are the documentation links that explain the performance and cost implications of increasing versionRetentionPeriod https://cloud.google.com/spanner/docs/pitr#performance https://cloud.google.com/spanner/docs/use-pitr#estimate-storage