JPS5764856A - Index access control system - Google Patents

Index access control system

Info

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
Application number
JP55139623A
Other languages
Japanese (ja)
Inventor
Toshiaki Oba
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP55139623A priority Critical patent/JPS5764856A/en
Publication of JPS5764856A publication Critical patent/JPS5764856A/en
Pending legal-status Critical Current

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.
JP55139623A 1980-10-06 1980-10-06 Index access control system Pending JPS5764856A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (4)

* Cited by examiner, † Cited by third party
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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