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enum_tx_isolation getTxIsolation();
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system_status_var status_var;
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THR_LOCK_INFO lock_info; /**< Locking information for this session */
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THR_LOCK_OWNER main_lock_id; /**< To use for conventional queries */
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THR_LOCK_OWNER *lock_id; /**< If not main_lock_id, points to the lock_id of a cursor. */