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30-Mar-2020 02:08

invalidating query cache entries table-33

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While sometime this works, others don’t; the query cache is “disabled” and you still see the SQL thread in state “invalidating query cache entries (table)”.That is related to a known bug, fixed in My SQL 5.5 : on the old non-Percona servers which caused the replication to halt until the cache was invalidated (Which took a lot of time). As examples, a segment of storage, which includes a plurality of pages of storage, or a region of storage, which includes a plurality of segments of storage, is selected to be invalidated. The foregoing and other objects, features, and advantages of the invention are apparent from the following detailed description taken in conjunction with the accompanying drawings in which: In accordance with an aspect of the present invention, a specified portion of storage (e.g., virtual storage) is invalidated. Thus, although there are instructions to invalidate a page of storage and clear buffers of entries associated with that page, and instructions to clear entire buffers, there still exists a need for instructions that can selectively invalidate various sizes of units of storage and/or clear buffers of entries associated therewith. For instance, in the z/Architecture, an instruction, referred to as a Compare and Swap and Purge (CSP) instruction, purges all entries of Translation Lookaside Buffers.

invalidating query cache entries table-71

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System and computer program products corresponding to the above-summarized methods are also described and claimed herein.

The method includes, for instance, specifying, via an instruction, a unit of storage to be invalidated, the unit of storage including a plurality of pages of storage; and invalidating the unit of storage.

The shortcomings of the prior art are overcome and additional advantages are provided through the provision of a method of invalidating storage of a computing environment.

The method includes, for instance, identifying a unit of storage for which clearing of one or more entries of one or more buffers is to be performed, wherein the unit of storage includes a plurality of pages of storage; and clearing one or more entries of the one or more buffers associated with the identified unit of storage, wherein one or more entries associated with another unit of storage are not cleared.

In another aspect of the present invention, a method of facilitating the clearing of buffers of a computing environment is provided.

In a further aspect of the present invention, buffer entries (e.g., Translation Lookaside Buffer entries) associated with the storage being invalidated, or other storage, are cleared.