Used to establish a lock hierarchy 用于建立鎖的層次結(jié)構(gòu)。
Indicates the intention to place u locks on some subordinate resource in the lock hierarchy 指示有意將u鎖放置在鎖層次結(jié)構(gòu)中的某個(gè)從屬資源上。
Indicates the intention to place x locks on some subordinate resource in the lock hierarchy 指示有意將x鎖放置在鎖層次結(jié)構(gòu)中的某個(gè)從屬資源上。
Indicates the intention to place s locks on some subordinate resource in the lock hierarchy 指示有意將s鎖放置在鎖層次結(jié)構(gòu)中的某個(gè)從屬資源上。
Indicates shared access to a resource with the intent of acquiring update locks on subordinate resources in the lock hierarchy 指示對(duì)有意在鎖層次結(jié)構(gòu)中的從屬資源上獲取更新鎖的資源進(jìn)行共享訪問。