content_image/798647.jpg content_image/798646.jpg
For more information, see Section 23.5.13, “NDB API Statistics Counters and Variables” . 

• Ndb_api_wait_meta_request_count_slave 

<img src='content_image/798647.jpg'>

## Note 

Deprecated in NDB 8.0.23; use Ndb_api_wait_meta_request_count_replica  instead. 

The number of times a thread has been blocked by this replica waiting for a metadata-based signal, such as is expected for DDL requests, new epochs, and seizure of transaction records. 

Although this variable can be read using either SHOW GLOBAL STATUS  or SHOW SESSION STATUS , it is effectively global in scope. If this MySQL server does not act as a replica, or does not use NDB tables, this value is always 0. 

For more information, see Section 23.5.13, “NDB API Statistics Counters and Variables” . 

• Ndb_api_wait_meta_request_count 

The number of times a thread has been blocked by this MySQL Server (SQL node) waiting for a metadata-based signal, such as is expected for DDL requests, new epochs, and seizure of transaction records. 

Although this variable can be read using either SHOW GLOBAL STATUS  or SHOW SESSION STATUS , it is effectively global in scope. 

For more information, see Section 23.5.13, “NDB API Statistics Counters and Variables” . 

• Ndb_api_wait_nanos_count_session 

Total time (in nanoseconds) spent in this client session waiting for any type of signal from the data nodes. 

Although this variable can be read using either SHOW GLOBAL STATUS  or SHOW SESSION STATUS , it relates to the current session only, and is not affected by any other clients of this mysqld . 

For more information, see Section 23.5.13, “NDB API Statistics Counters and Variables” . 

• Ndb_api_wait_nanos_count_replica 

Total time (in nanoseconds) spent by this replica waiting for any type of signal from the data nodes. 

Although this variable can be read using either SHOW GLOBAL STATUS  or SHOW SESSION STATUS , it is effectively global in scope. If this MySQL server does not act as a replica, or does not use NDB tables, this value is always 0. 

For more information, see Section 23.5.13, “NDB API Statistics Counters and Variables” . 

• Ndb_api_wait_nanos_count_slave 

<img src='content_image/798646.jpg'>

## Note 

Deprecated in NDB 8.0.23; use Ndb_api_wait_nanos_count_replica instead. 

Total time (in nanoseconds) spent by this replica waiting for any type of signal from the data nodes. 

