JPS5764856A - Index access control system - Google Patents
Index access control systemInfo
- Publication number
- JPS5764856A JPS5764856A JP55139623A JP13962380A JPS5764856A JP S5764856 A JPS5764856 A JP S5764856A JP 55139623 A JP55139623 A JP 55139623A JP 13962380 A JP13962380 A JP 13962380A JP S5764856 A JPS5764856 A JP S5764856A
- Authority
- JP
- Japan
- Prior art keywords
- index
- data
- address
- storing part
- memory
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/02—Addressing or allocation; Relocation
- G06F12/08—Addressing or allocation; Relocation in hierarchically structured memory systems, e.g. virtual memory systems
- G06F12/12—Replacement control
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Information Retrieval, Db Structures And Fs Structures Therefor (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)
Abstract
PURPOSE:To greatly reduce the time which is consumed for the retrieval of data, by separating an access to the indes from an access to the data to constitute the hardware mechanisms which are independent of each other. CONSTITUTION:The format of an index memory 103 contains a storing part A of an address Adr, a storing part B of a data block DATA which becomes a subject of input/output as an index and a storing part C of a flag F showing the frequency of reference to the data block. For the reading of index, the flag F is set if the address of an index block to be referred to and the address of the destination of transfer are applied within a memory 103. If no address exists, the reading and transfer is carried out by a disk address and on a disk. At the same time, the replacement is carried out with a frame having the lowest reference freuquency F. In such way, the index data having a high frequency of reference is stored in a highspeed random access memory 103 to greatly reduce the retrieving time.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55139623A JPS5764856A (en) | 1980-10-06 | 1980-10-06 | Index access control system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55139623A JPS5764856A (en) | 1980-10-06 | 1980-10-06 | Index access control system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5764856A true JPS5764856A (en) | 1982-04-20 |
Family
ID=15249589
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55139623A Pending JPS5764856A (en) | 1980-10-06 | 1980-10-06 | Index access control system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5764856A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5947659A (en) * | 1982-09-13 | 1984-03-17 | Hitachi Ltd | File control method |
JPS59178627A (en) * | 1983-03-29 | 1984-10-09 | Canon Inc | Information recording and reproducing device |
JPS59207063A (en) * | 1983-05-06 | 1984-11-24 | Matsushita Electric Ind Co Ltd | Automatic disc replacing device |
JPS60224178A (en) * | 1984-04-23 | 1985-11-08 | Nec Corp | Accessing system of indexing order forming file using disk cash |
-
1980
- 1980-10-06 JP JP55139623A patent/JPS5764856A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5947659A (en) * | 1982-09-13 | 1984-03-17 | Hitachi Ltd | File control method |
JPS59178627A (en) * | 1983-03-29 | 1984-10-09 | Canon Inc | Information recording and reproducing device |
JPS59207063A (en) * | 1983-05-06 | 1984-11-24 | Matsushita Electric Ind Co Ltd | Automatic disc replacing device |
JPS60224178A (en) * | 1984-04-23 | 1985-11-08 | Nec Corp | Accessing system of indexing order forming file using disk cash |
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