export declare const DatabaseDatabaseDialect: {
    /**
     * Default value. This value will create a database with the GOOGLE_STANDARD_SQL dialect.
     */
    readonly DatabaseDialectUnspecified: "DATABASE_DIALECT_UNSPECIFIED";
    /**
     * GoogleSQL supported SQL.
     */
    readonly GoogleStandardSql: "GOOGLE_STANDARD_SQL";
    /**
     * PostgreSQL supported SQL.
     */
    readonly Postgresql: "POSTGRESQL";
};
/**
 * Optional. The dialect of the Cloud Spanner Database.
 */
export type DatabaseDatabaseDialect = (typeof DatabaseDatabaseDialect)[keyof typeof DatabaseDatabaseDialect];
export declare const FreeInstanceMetadataExpireBehavior: {
    /**
     * Not specified.
     */
    readonly ExpireBehaviorUnspecified: "EXPIRE_BEHAVIOR_UNSPECIFIED";
    /**
     * When the free instance expires, upgrade the instance to a provisioned instance.
     */
    readonly FreeToProvisioned: "FREE_TO_PROVISIONED";
    /**
     * When the free instance expires, disable the instance, and delete it after the grace period passes if it has not been upgraded.
     */
    readonly RemoveAfterGracePeriod: "REMOVE_AFTER_GRACE_PERIOD";
};
/**
 * Specifies the expiration behavior of a free instance. The default of ExpireBehavior is `REMOVE_AFTER_GRACE_PERIOD`. This can be modified during or after creation, and before expiration.
 */
export type FreeInstanceMetadataExpireBehavior = (typeof FreeInstanceMetadataExpireBehavior)[keyof typeof FreeInstanceMetadataExpireBehavior];
export declare const InstanceInstanceType: {
    /**
     * Not specified.
     */
    readonly InstanceTypeUnspecified: "INSTANCE_TYPE_UNSPECIFIED";
    /**
     * Provisioned instances have dedicated resources, standard usage limits and support.
     */
    readonly Provisioned: "PROVISIONED";
    /**
     * Free instances provide no guarantee for dedicated resources, [node_count, processing_units] should be 0. They come with stricter usage limits and limited support.
     */
    readonly FreeInstance: "FREE_INSTANCE";
};
/**
 * The `InstanceType` of the current instance.
 */
export type InstanceInstanceType = (typeof InstanceInstanceType)[keyof typeof InstanceInstanceType];
export declare const ReplicaInfoType: {
    /**
     * Not specified.
     */
    readonly TypeUnspecified: "TYPE_UNSPECIFIED";
    /**
     * Read-write replicas support both reads and writes. These replicas: * Maintain a full copy of your data. * Serve reads. * Can vote whether to commit a write. * Participate in leadership election. * Are eligible to become a leader.
     */
    readonly ReadWrite: "READ_WRITE";
    /**
     * Read-only replicas only support reads (not writes). Read-only replicas: * Maintain a full copy of your data. * Serve reads. * Do not participate in voting to commit writes. * Are not eligible to become a leader.
     */
    readonly ReadOnly: "READ_ONLY";
    /**
     * Witness replicas don't support reads but do participate in voting to commit writes. Witness replicas: * Do not maintain a full copy of data. * Do not serve reads. * Vote whether to commit writes. * Participate in leader election but are not eligible to become leader.
     */
    readonly Witness: "WITNESS";
};
/**
 * The type of replica.
 */
export type ReplicaInfoType = (typeof ReplicaInfoType)[keyof typeof ReplicaInfoType];