Performance Schema prepared_statements_instances Table
MariaDB starting with 10.5.2
The prepared_statements_instances table was introduced in MariaDB 10.5.2.
The prepared_statements_instances table contains aggregated statistics of prepared statements.
The maximum number of rows in the table is determined by the performance_schema_max_prepared_statement_instances system variable, which is by default autosized on startup.
The table contains the following columns:
+-----------------------------+--------------------------------------------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-----------------------------+--------------------------------------------------------+------+-----+---------+-------+
| OBJECT_INSTANCE_BEGIN | bigint(20) unsigned | NO | | NULL | |
| STATEMENT_ID | bigint(20) unsigned | NO | | NULL | |
| STATEMENT_NAME | varchar(64) | YES | | NULL | |
| SQL_TEXT | longtext | NO | | NULL | |
| OWNER_THREAD_ID | bigint(20) unsigned | NO | | NULL | |
| OWNER_EVENT_ID | bigint(20) unsigned | NO | | NULL | |
| OWNER_OBJECT_TYPE | enum('EVENT','FUNCTION','PROCEDURE','TABLE','TRIGGER') | YES | | NULL | |
| OWNER_OBJECT_SCHEMA | varchar(64) | YES | | NULL | |
| OWNER_OBJECT_NAME | varchar(64) | YES | | NULL | |
| TIMER_PREPARE | bigint(20) unsigned | NO | | NULL | |
| COUNT_REPREPARE | bigint(20) unsigned | NO | | NULL | |
| COUNT_EXECUTE | bigint(20) unsigned | NO | | NULL | |
| SUM_TIMER_EXECUTE | bigint(20) unsigned | NO | | NULL | |
| MIN_TIMER_EXECUTE | bigint(20) unsigned | NO | | NULL | |
| AVG_TIMER_EXECUTE | bigint(20) unsigned | NO | | NULL | |
| MAX_TIMER_EXECUTE | bigint(20) unsigned | NO | | NULL | |
| SUM_LOCK_TIME | bigint(20) unsigned | NO | | NULL | |
| SUM_ERRORS | bigint(20) unsigned | NO | | NULL | |
| SUM_WARNINGS | bigint(20) unsigned | NO | | NULL | |
| SUM_ROWS_AFFECTED | bigint(20) unsigned | NO | | NULL | |
| SUM_ROWS_SENT | bigint(20) unsigned | NO | | NULL | |
| SUM_ROWS_EXAMINED | bigint(20) unsigned | NO | | NULL | |
| SUM_CREATED_TMP_DISK_TABLES | bigint(20) unsigned | NO | | NULL | |
| SUM_CREATED_TMP_TABLES | bigint(20) unsigned | NO | | NULL | |
| SUM_SELECT_FULL_JOIN | bigint(20) unsigned | NO | | NULL | |
| SUM_SELECT_FULL_RANGE_JOIN | bigint(20) unsigned | NO | | NULL | |
| SUM_SELECT_RANGE | bigint(20) unsigned | NO | | NULL | |
| SUM_SELECT_RANGE_CHECK | bigint(20) unsigned | NO | | NULL | |
| SUM_SELECT_SCAN | bigint(20) unsigned | NO | | NULL | |
| SUM_SORT_MERGE_PASSES | bigint(20) unsigned | NO | | NULL | |
| SUM_SORT_RANGE | bigint(20) unsigned | NO | | NULL | |
| SUM_SORT_ROWS | bigint(20) unsigned | NO | | NULL | |
| SUM_SORT_SCAN | bigint(20) unsigned | NO | | NULL | |
| SUM_NO_INDEX_USED | bigint(20) unsigned | NO | | NULL | |
| SUM_NO_GOOD_INDEX_USED | bigint(20) unsigned | NO | | NULL | |
+-----------------------------+--------------------------------------------------------+------+-----+---------+-------+
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